updated release notes

* added from_range ctors and insert_range
* worked around GCC 10-11 bug when piping a temporary range
* added insert_range_(or|and)_[c]visit
* typo
* tried to avoid MinGW32 compilation OOM in cfoa/insert_tests.cpp
* s/<debug-symbols>off/<cxxflags>-g0
* tested CTAD deduction guides
* typo
* updated docs
* Justified std::from_range_t detection trick
* reduced parallel build jobs in MINGW32 to try to avoid OOM during compilation
* tried to avoid compilation OOM by tweaking GC
* relaxed GCC parameters somewhat
* applied same changes to test/CMakeLists.txt
* fixed CMake syntax error
* fixed GCC commandline syntax error

.drone.jsonnet

@@ -34,8 +34,9 @@ local linux_pipeline(name, image, environment, packages = "", sources = [], arch
             commands:
             [
                 'set -e',
+                'echo $DRONE_STAGE_MACHINE',
                 'uname -a',
-                'wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -',
+                'curl -sSL --retry 5 https://apt.llvm.org/llvm-snapshot.gpg.key | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/llvm-snapshot.gpg',
             ] +
             (if sources != [] then [ ('apt-add-repository "' + source + '"') for source in sources ] else []) +
             (if packages != "" then [ 'apt-get update', 'apt-get -y install ' + packages ] else []) +
@@ -66,6 +67,8 @@ local macos_pipeline(name, environment, xcode_version = "12.2", osx_version = "c
             environment: environment + { "DEVELOPER_DIR": "/Applications/Xcode-" + xcode_version + ".app/Contents/Developer" },
             commands:
             [
+                'echo $DRONE_STAGE_MACHINE',
+                'sw_vers',
                 'uname -a',
                 'export LIBRARY=' + library,
                 './.drone/drone.sh',

.github/workflows/ci.yml

@@ -60,6 +60,9 @@ jobs:
           - { compiler: gcc-12,    cxxstd: '11,14,17,20', os: 'ubuntu-22.04', install: 'g++-12' }
           - { compiler: gcc-13,    cxxstd: '11,14,17,20', os: 'ubuntu-24.04', install: 'g++-13' }
           - { compiler: gcc-14,    cxxstd: '11,14,17,20', os: 'ubuntu-24.04', install: 'g++-14' }
+          - { compiler: gcc-16,    cxxstd: '11,14,17', container: 'ubuntu:26.04', os: 'ubuntu-latest', install: 'g++-16-multilib' }
+          - { compiler: gcc-16,    cxxstd: '20,23,2c', container: 'ubuntu:26.04', os: 'ubuntu-latest', install: 'g++-16-multilib' }
+
           - { name: "gcc-14 w/ sanitizers (11)", sanitize: yes,
               compiler: gcc-14,    cxxstd: '11',          os: 'ubuntu-24.04', install: 'g++-14', ccache_key: "san1" }
           - { name: "gcc-14 w/ sanitizers (14)", sanitize: yes,
@@ -72,7 +75,6 @@ jobs:
               compiler: gcc-14,    cxxstd: '2b',          os: 'ubuntu-24.04', install: 'g++-14', ccache_key: "san2" }
           - { name: Collect coverage, coverage: yes,
               compiler: gcc-14,    cxxstd: '20',          os: 'ubuntu-24.04', install: 'g++-14 g++-14-multilib', address-model: '32,64', ccache_key: "cov" }
-
           - { name: "cfoa tsan (gcc-14)", cxxstd: '11,14,17,20,2b', os: 'ubuntu-24.04', install: 'g++-14', compiler: gcc-14,
               targets: 'libs/unordered/test//cfoa_tests', thread-sanitize: yes, ccache_key: "tsan" }
 
@@ -101,6 +103,10 @@ jobs:
           - { compiler: 'clang-17', cxxstd: '17,20,2b',    os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-17 libc++-17-dev libc++abi-17-dev' }
           - { compiler: 'clang-18', cxxstd: '11,14',       os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-18 libc++-18-dev libc++abi-18-dev' }
           - { compiler: 'clang-18', cxxstd: '17,20,2b',    os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-18 libc++-18-dev libc++abi-18-dev' }
+          - { compiler: 'clang-19', cxxstd: '11,14',       os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-19 libc++-19-dev libc++abi-19-dev' }
+          - { compiler: 'clang-19', cxxstd: '17,20,2b',    os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-19 libc++-19-dev libc++abi-19-dev' }
+          - { compiler: 'clang-20', cxxstd: '11,14,17',    os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-20 libc++-20-dev libc++abi-20-dev' }
+          - { compiler: 'clang-20', cxxstd: '20,23,2c',    os: 'ubuntu-24.04', stdlib: libc++, install: 'clang-20 libc++-20-dev libc++abi-20-dev' }
 
           # not using libc++ because of https://github.com/llvm/llvm-project/issues/52771
           - { name: "clang-18 w/ sanitizers (11,14)", sanitize: yes,
@@ -117,10 +123,12 @@ jobs:
               stdlib: libc++, install: 'clang-18 libc++-18-dev libc++abi-18-dev', ccache_key: "tsan" }
 
           # OSX, clang
-          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-13', sanitize: yes, ccache_key: "san1" }
+          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-latest', sanitize: yes, ccache: no, ccache_key: "san1" }
-          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-13', thread-sanitize: yes, targets: 'libs/unordered/test//cfoa_tests', ccache_key: "tsan" }
+          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-latest', thread-sanitize: yes, targets: 'libs/unordered/test//cfoa_tests', ccache: no, ccache_key: "tsan" }
+
           - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-14' }
-          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-15' }
+          - { compiler: clang, cxxstd: '11,14,17,20,23,2c', os: 'macos-15' }
+          - { compiler: clang, cxxstd: '11,14,17,20,23,2c', os: 'macos-26' }
 
     timeout-minutes: 360
     # posix (gcc-12 w/ sanitizers is taking longer than 210 minutes
@@ -139,12 +147,7 @@ jobs:
             fi
             if [ -n "${{matrix.container}}" ] && [ -f "/etc/debian_version" ]; then
                 apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
-                apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y sudo software-properties-common
+                apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y sudo software-properties-common git g++
-                # Need (newer) git, and the older Ubuntu container may require requesting the key manually using port 80
-                apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys E1DD270288B4E6030699E45FA1715D88E1DF1F24
-                for i in {1..${NET_RETRY_COUNT:-3}}; do sudo -E add-apt-repository -y ppa:git-core/ppa && break || sleep 10; done
-                apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
-                apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y g++ python-is-python3 git
             fi
             # For jobs not compatible with ccache, use "ccache: no" in the matrix
             if [[ "${{ matrix.ccache }}" == "no" ]]; then
@@ -344,7 +347,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { sys: MINGW32, compiler: gcc, cxxstd: '11,17,20', variant: 'release' }
+          - { sys: MINGW32, compiler: gcc, cxxstd: '11,17,20', variant: 'release', cxxflags: '--param ggc-min-expand=10 --param ggc-min-heapsize=16384' }
           - { sys: MINGW64, compiler: gcc, cxxstd: '11,17,20', variant: 'debug,release' }
 
     needs: [runner-selection]
@@ -380,6 +383,7 @@ jobs:
           B2_SANITIZE: ${{matrix.sanitize}}
           B2_STDLIB: ${{matrix.stdlib}}
           B2_VARIANT: ${{matrix.variant}}
+          B2_CXXFLAGS: ${{ matrix.cxxflags }}
         run: ci/github/install.sh
 
       - name: Run tests

CMakeLists.txt

@@ -23,12 +23,28 @@ target_link_libraries(boost_unordered
     Boost::throw_exception
 )
 
-if(CMAKE_VERSION VERSION_GREATER 3.18 AND CMAKE_GENERATOR MATCHES "Visual Studio")
+# Add headers and .natvis to project, for better IDE integration
 
-  file(GLOB_RECURSE boost_unordered_IDEFILES CONFIGURE_DEPENDS include/*.hpp)
+if(NOT CMAKE_VERSION VERSION_LESS 3.19)
-  source_group(TREE ${PROJECT_SOURCE_DIR}/include FILES ${boost_unordered_IDEFILES} PREFIX "Header Files")
+
-  list(APPEND boost_unordered_IDEFILES extra/boost_unordered.natvis)
+  # Using target_sources with PRIVATE or PUBLIC on INTERFACE targets requires 3.19
-  target_sources(boost_unordered PRIVATE ${boost_unordered_IDEFILES})
+
+  file(GLOB_RECURSE headers CONFIGURE_DEPENDS include/*.hpp)
+  target_sources(boost_unordered PRIVATE ${headers})
+  unset(headers)
+
+  if(MSVC)
+
+    # Only Visual Studio needs this, but the generator may also be Ninja
+    target_sources(boost_unordered PUBLIC extra/boost_unordered.natvis)
+
+  endif()
+
+  # Make IDE project folders match directory structure
+
+  get_target_property(sources boost_unordered SOURCES)
+  source_group(TREE ${PROJECT_SOURCE_DIR} FILES ${sources})
+  unset(sources)
 
 endif()
 

README.md

@@ -1,7 +1,7 @@
 # Boost.Unordered
 
-[![Branch](https://img.shields.io/badge/branch-master-brightgreen.svg)](https://github.com/boostorg/unordered/tree/master) [![CI](https://github.com/boostorg/unordered/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/unordered/actions/workflows/ci.yml) [![Drone status](https://img.shields.io/drone/build/boostorg/unordered/master?server=https%3A%2F%2Fdrone.cpp.al&logo=drone&logoColor=%23CCCCCC&label=CI)](https://drone.cpp.al/boostorg/unordered) [![Build status](https://img.shields.io/appveyor/build/cppalliance/unordered/master?logo=appveyor&label=CI)](https://ci.appveyor.com/project/cppalliance/unordered/branch/master)  [![codecov](https://codecov.io/gh/boostorg/unordered/branch/master/graph/badge.svg)](https://codecov.io/gh/boostorg/unordered/branch/master)  [![Deps](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/unordered.html)  [![Documentation](https://img.shields.io/badge/docs-master-brightgreen.svg)](https://www.boost.org/doc/libs/master/libs/unordered/index.html)  [![Enter the Matrix](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/unordered.html)<br/>
+[![Branch](https://img.shields.io/badge/branch-master-brightgreen.svg)](https://github.com/boostorg/unordered/tree/master) [![CI](https://github.com/boostorg/unordered/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/unordered/actions/workflows/ci.yml) [![Drone status](https://img.shields.io/drone/build/boostorg/unordered/master?server=https%3A%2F%2Fdrone.cpp.al&logo=drone&logoColor=%23CCCCCC&label=CI)](https://drone.cpp.al/boostorg/unordered) [![Build status](https://img.shields.io/appveyor/build/cppalliance/unordered/master?logo=appveyor&label=CI)](https://ci.appveyor.com/project/cppalliance/unordered/branch/master)  [![codecov](https://codecov.io/gh/boostorg/unordered/branch/master/graph/badge.svg)](https://codecov.io/gh/boostorg/unordered/branch/master)  [![Deps](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/unordered.html)  [![Documentation](https://img.shields.io/badge/docs-master-brightgreen.svg)](https://www.boost.org/doc/libs/master/libs/unordered/index.html)  [![Enter the Matrix](https://img.shields.io/badge/matrix-master-brightgreen.svg)](https://regression.boost.org/master/developer/unordered.html)<br/>
-[![Branch](https://img.shields.io/badge/branch-develop-brightgreen.svg)](https://github.com/boostorg/unordered/tree/develop) [![CI](https://github.com/boostorg/unordered/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/unordered/actions/workflows/ci.yml) [![Drone status](https://img.shields.io/drone/build/boostorg/unordered/develop?server=https%3A%2F%2Fdrone.cpp.al&logo=drone&logoColor=%23CCCCCC&label=CI)](https://drone.cpp.al/boostorg/unordered) [![Build status](https://img.shields.io/appveyor/build/cppalliance/unordered/develop?logo=appveyor&label=CI)](https://ci.appveyor.com/project/cppalliance/unordered/branch/develop) [![codecov](https://codecov.io/gh/boostorg/unordered/branch/develop/graph/badge.svg)](https://codecov.io/gh/boostorg/unordered/branch/develop) [![Deps](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/unordered.html) [![Documentation](https://img.shields.io/badge/docs-develop-brightgreen.svg)](https://www.boost.org/doc/libs/develop/libs/unordered/index.html) [![Enter the Matrix](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/unordered.html)<br/>
+[![Branch](https://img.shields.io/badge/branch-develop-brightgreen.svg)](https://github.com/boostorg/unordered/tree/develop) [![CI](https://github.com/boostorg/unordered/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/unordered/actions/workflows/ci.yml) [![Drone status](https://img.shields.io/drone/build/boostorg/unordered/develop?server=https%3A%2F%2Fdrone.cpp.al&logo=drone&logoColor=%23CCCCCC&label=CI)](https://drone.cpp.al/boostorg/unordered) [![Build status](https://img.shields.io/appveyor/build/cppalliance/unordered/develop?logo=appveyor&label=CI)](https://ci.appveyor.com/project/cppalliance/unordered/branch/develop) [![codecov](https://codecov.io/gh/boostorg/unordered/branch/develop/graph/badge.svg)](https://codecov.io/gh/boostorg/unordered/branch/develop) [![Deps](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/unordered.html) [![Documentation](https://img.shields.io/badge/docs-develop-brightgreen.svg)](https://www.boost.org/doc/libs/develop/libs/unordered/index.html) [![Enter the Matrix](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](https://regression.boost.org/develop/developer/unordered.html)<br/>
 [![BSL 1.0](https://img.shields.io/badge/license-BSL_1.0-blue.svg)](https://www.boost.org/users/license.html) <img alt="C++11 required" src="https://img.shields.io/badge/standard-C%2b%2b11-blue.svg"> <img alt="Header-only library" src="https://img.shields.io/badge/build-header--only-blue.svg">
 
 Boost.Unordered offers a catalog of hash containers with different standards compliance levels, performances and intented usage scenarios:

doc/Jamfile.v2

@@ -1,57 +1,28 @@
-import generate ;
+# Copyright 2026 Joaquin M Lopez Munoz
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
 import path ;
-import property-set ;
-import virtual-target ;
 
-path-constant HERE : . ;
+make html_ : build_antora.sh : @run-script ;
 
-make html/index.html : build_antora.sh : @run-script ;
-generate files-to-install : html/index.html : <generating-rule>@delayed-glob ;
-install install
-  : files-to-install
-  : <location>html
-    <install-source-root>html/unordered
-  ;
-explicit html/index.html files-to-install ;
-
-# this runs the antora script
 actions run-script
 {
     bash $(>)
 }
 
-# this globs after its sources are created
+path-constant DOC_DIR : . ;
-rule delayed-glob ( project name : property-set : sources * )
+.node_modules = [ path.join $(DOC_DIR) node_modules ] ;
+
+make cleanup_node_modules_ : html_ : @cleanup-node-modules ;
+
+actions cleanup-node-modules
 {
-  for local src in $(sources)
+    rm -rf $(.node_modules)
-  {
-    # the next line causes the source to be generated immediately
-    # and not later (which it normally would)
-    UPDATE_NOW [ $(src).actualize ] ;
-  }
-
-  # we need to construct the path to the globbed directory;
-  # this path would be <current-project>/antora
-  local root = [ path.root html [ $(project).location ] ] ;
-  local files ;
-
-  # actual globbing happens here
-  for local file in [ path.glob-tree $(root) : * ]
-  {
-    # we have to skip directories, because our match expression accepts anything
-    if [ CHECK_IF_FILE $(file) ]
-    {
-      # we construct a list of targets to copy
-      files += [ virtual-target.from-file $(file:D=) : $(file:D) : $(project) ] ;
-    }
-  }
-
-  # we prepend empty usage requirements to the result
-  return [ property-set.empty ] $(files) ;
 }
 
 ###############################################################################
 alias boostdoc ;
 explicit boostdoc ;
-alias boostrelease : install ;
+alias boostrelease : html_ cleanup_node_modules_ ;
 explicit boostrelease ;

doc/antora_docs.sh

@@ -1,9 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
-cd "$SCRIPT_DIR"
-
-npm ci
-npx antora unordered-playbook.yml

doc/build_antora.sh

@@ -7,3 +7,4 @@ cd "$SCRIPT_DIR"
 
 npm ci
 npx antora unordered-playbook.yml
+cp -f html/index.html html/unordered.html

doc/modules/ROOT/pages/changes.adoc

@@ -6,6 +6,21 @@
 :github-pr-url: https://github.com/boostorg/unordered/pull
 :cpp: C++
 
+== Release 1.92.0
+
+* Added interoperability with pass:[C++20] ranges to all the containers in the library:
+`insert_range` (plus `insert_range_(or|and)_[c]visit` for concurrent containers),
+`std::from_range` construction and associated CTAD deduction guides.
+The `boost::unordered::from_range` construction tag is provided
+as an alternative to pass:[C++23] `std::from_range` or when this is not available.
+* Fixed a performance issue with closed-addressing containers when rehashing at very
+large container sizes ({github-pr-url}/348[PR#348^]). Contributed by Daniel Král. 
+
+== Release 1.91.0
+
+* Fixed the returned value of range insertion in concurrent containers
+({github-pr-url}/344[PR#344^]).
+
 == Release 1.89.0
 
 * Deprecated `boost::unordered::hash_is_avalanching` is now a using-declaration of

doc/modules/ROOT/pages/copyright.adoc

@@ -11,7 +11,7 @@ Copyright (C) 2005-2008 Daniel James
 
 Copyright (C) 2022-2025 Christian Mazakas
 
-Copyright (C) 2022-2025 Joaquín M López Muñoz
+Copyright (C) 2022-2026 Joaquín M López Muñoz
 
 Copyright (C) 2022-2023 Peter Dimov
 

doc/modules/ROOT/pages/reference/concurrent_flat_map.adoc

@@ -77,6 +77,12 @@ namespace unordered {
     xref:#concurrent_flat_map_copy_constructor_with_allocator[concurrent_flat_map](const concurrent_flat_map& other, const Allocator& a);
     xref:#concurrent_flat_map_move_constructor_with_allocator[concurrent_flat_map](concurrent_flat_map&& other, const Allocator& a);
     xref:#concurrent_flat_map_move_constructor_from_unordered_flat_map[concurrent_flat_map](unordered_flat_map<Key, T, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_map_range_constructor[concurrent_flat_map](FromRangeT&&, R&& rg,
+                          size_type n = _implementation-defined_,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& a = allocator_type());
     xref:#concurrent_flat_map_initializer_list_constructor[concurrent_flat_map](std::initializer_list<value_type> il,
                         size_type n = _implementation-defined_
                         const hasher& hf = hasher(),
@@ -90,6 +96,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#concurrent_flat_map_iterator_range_constructor_with_bucket_count_and_hasher[concurrent_flat_map](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                           const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_map_range_constructor_with_allocator[concurrent_flat_map](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_map_range_constructor_with_bucket_count_and_allocator[concurrent_flat_map](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_map_range_constructor_with_bucket_count_and_hasher_and_allocator[concurrent_flat_map](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                          const allocator_type& a);
     xref:#concurrent_flat_map_initializer_list_constructor_with_allocator[concurrent_flat_map](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#concurrent_flat_map_initializer_list_constructor_with_bucket_count_and_allocator[concurrent_flat_map](std::initializer_list<value_type> il, size_type n,
                         const allocator_type& a);
@@ -152,6 +165,8 @@ namespace unordered {
     bool xref:#concurrent_flat_map_move_insert[insert](value_type&& obj);
     bool xref:#concurrent_flat_map_move_insert[insert](init_type&& obj);
     template<class InputIterator> size_type xref:#concurrent_flat_map_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      size_type xref:#concurrent_flat_map_insert_range[insert_range](R&& rg);
     size_type xref:#concurrent_flat_map_insert_initializer_list[insert](std::initializer_list<value_type> il);
 
     template<class... Args, class F> bool xref:#concurrent_flat_map_emplace_or_cvisit[emplace_or_visit](Args&&... args, F&& f);
@@ -168,6 +183,10 @@ namespace unordered {
       size_type xref:#concurrent_flat_map_insert_iterator_range_or_visit[insert_or_visit](InputIterator first, InputIterator last, F f);
     template<class InputIterator,class F>
       size_type xref:#concurrent_flat_map_insert_iterator_range_or_visit[insert_or_cvisit](InputIterator first, InputIterator last, F f);
+    template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_flat_map_insert_range_or_visit[insert_range_or_visit](R&& rg, F f);
+    template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_flat_map_insert_range_or_visit[insert_range_or_cvisit](R&& rg, F f);
     template<class F> size_type xref:#concurrent_flat_map_insert_initializer_list_or_visit[insert_or_visit](std::initializer_list<value_type> il, F f);
     template<class F> size_type xref:#concurrent_flat_map_insert_initializer_list_or_visit[insert_or_cvisit](std::initializer_list<value_type> il, F f);
 
@@ -187,6 +206,10 @@ namespace unordered {
       size_type xref:#concurrent_flat_map_insert_iterator_range_and_visit[insert_and_visit](InputIterator first, InputIterator last, F1 f1, F2 f2);
     template<class InputIterator,class F1, class F2>
       size_type xref:#concurrent_flat_map_insert_iterator_range_and_visit[insert_and_cvisit](InputIterator first, InputIterator last, F1 f1, F2 f2);
+    template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_flat_map_insert_range_and_visit[insert_range_and_visit](R&& rg, F1 f1, F2 f2);
+    template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_flat_map_insert_range_and_visit[insert_range_and_cvisit](R&& rg, F1 f1, F2 f2);
     template<class F1, class F2>
       size_type xref:#concurrent_flat_map_insert_initializer_list_and_visit[insert_and_visit](std::initializer_list<value_type> il, F1 f1, F2 f2);
     template<class F1, class F2>
@@ -282,6 +305,17 @@ namespace unordered {
       -> concurrent_flat_map<xref:#concurrent_flat_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#concurrent_flat_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                              Pred, Allocator>;
 
+  template<xref:#concurrent_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#concurrent_flat_map_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    concurrent_flat_map(FromRangeT&&, R&&,
+                        typename xref:#concurrent_flat_map_deduction_guides[__see below__]::size_type = xref:#concurrent_flat_map_deduction_guides[__see below__], Hash = Hash(),
+                        Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_map<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                             Hash, Pred,Allocator>;
+
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
            class Allocator = std::allocator<std::pair<const Key, T>>>
@@ -308,6 +342,27 @@ namespace unordered {
       -> concurrent_flat_map<xref:#concurrent_flat_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#concurrent_flat_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                              std::equal_to<xref:#concurrent_flat_map_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#concurrent_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_flat_map(FromRangeT&&, R&&, typename xref:#concurrent_flat_map_deduction_guides[__see below__]::size_type, Allocator)
+      -> concurrent_flat_map<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#concurrent_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_flat_map(FromRangeT&&, R&&, Allocator)
+      -> concurrent_flat_map<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#concurrent_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    concurrent_flat_map(FromRangeT&&, R&&, typename xref:#concurrent_flat_map_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> concurrent_flat_map<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, std::equal_to<xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     concurrent_flat_map(std::initializer_list<std::pair<Key, T>>, typename xref:#concurrent_flat_map_deduction_guides[__see below__]::size_type,
                         Allocator)
@@ -444,6 +499,15 @@ Chunk size internally used in xref:concurrent_flat_map_bulk_visit[bulk visit] op
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 concurrent_flat_map();
@@ -591,6 +655,27 @@ Complexity:;; O(`bucket_count()`)
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_map(FromRangeT&&, R&& rg,
+                      size_type n = _implementation-defined_,
+                      const hasher& hf = hasher(),
+                      const key_equal& eql = key_equal(),
+                      const allocator_type& a = allocator_type());
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -663,6 +748,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_map(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty table using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_map(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_map(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                     const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -696,7 +833,7 @@ concurrent_flat_map(std::initializer_list<value_type> il, size_type n, const has
                     const allocator_type& a);
 ```
 
-Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate,and inserts the elements from `il` into it.
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -925,8 +1062,7 @@ size_type size() const noexcept;
 
 [horizontal]
 Returns:;; The number of elements in the table.
-
+Complexity:;; Constant time.
-[horizontal]
 Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect
 the true size of the table right after execution.
 
@@ -1014,6 +1150,24 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) this->xref:#concurrent_flat_map_emplace[emplace](std::forward<decltype(x)>(x));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List
 ```c++
 size_type insert(std::initializer_list<value_type> il);
@@ -1096,9 +1250,9 @@ only if `std::remove_reference<decltype(obj)>::type` is `value_type`.
 ==== Insert Iterator Range or Visit
 ```c++
 template<class InputIterator,class F>
-    size_type insert_or_visit(InputIterator first, InputIterator last, F f);
+  size_type insert_or_visit(InputIterator first, InputIterator last, F f);
 template<class InputIterator,class F>
-    size_type insert_or_cvisit(InputIterator first, InputIterator last, F f);
+  size_type insert_or_cvisit(InputIterator first, InputIterator last, F f);
 ```
 
 Equivalent to
@@ -1112,6 +1266,27 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range or Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) 
+    this->xref:#concurrent_flat_map_emplace_or_cvisit[emplace_or_[c\]visit](std::forward<decltype(x)>(x), std::ref(f));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List or Visit
 ```c++
 template<class F> size_type insert_or_visit(std::initializer_list<value_type> il, F f);
@@ -1216,6 +1391,28 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range and Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2);
+template<xref:#concurrent_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg)
+    this->xref:#concurrent_flat_map_emplace_and_cvisit[emplace_and_[c\]visit](
+      std::forward<decltype(x)>(x), std::ref(f1), std::ref(f2));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List and Visit
 ```c++
 template<class F1, class F2>
@@ -1743,6 +1940,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#concurrent_flat_map_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#concurrent_flat_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_flat_map_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/concurrent_flat_set.adoc

@@ -72,6 +72,12 @@ namespace unordered {
     xref:#concurrent_flat_set_copy_constructor_with_allocator[concurrent_flat_set](const concurrent_flat_set& other, const Allocator& a);
     xref:#concurrent_flat_set_move_constructor_with_allocator[concurrent_flat_set](concurrent_flat_set&& other, const Allocator& a);
     xref:#concurrent_flat_set_move_constructor_from_unordered_flat_set[concurrent_flat_set](unordered_flat_set<Key, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_set_range_constructor[concurrent_flat_set](FromRangeT&&, R&& rg,
+                          size_type n = _implementation-defined_,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& a = allocator_type());
     xref:#concurrent_flat_set_initializer_list_constructor[concurrent_flat_set](std::initializer_list<value_type> il,
                         size_type n = _implementation-defined_
                         const hasher& hf = hasher(),
@@ -85,6 +91,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#concurrent_flat_set_iterator_range_constructor_with_bucket_count_and_hasher[concurrent_flat_set](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                           const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_set_range_constructor_with_allocator[concurrent_flat_set](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_set_range_constructor_with_bucket_count_and_allocator[concurrent_flat_set](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_flat_set_range_constructor_with_bucket_count_and_hasher_and_allocator[concurrent_flat_set](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                          const allocator_type& a);
     xref:#concurrent_flat_set_initializer_list_constructor_with_allocator[concurrent_flat_set](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#concurrent_flat_set_initializer_list_constructor_with_bucket_count_and_allocator[concurrent_flat_set](std::initializer_list<value_type> il, size_type n,
                         const allocator_type& a);
@@ -145,6 +158,8 @@ namespace unordered {
     bool xref:#concurrent_flat_set_move_insert[insert](value_type&& obj);
     template<class K> bool xref:#concurrent_flat_set_transparent_insert[insert](K&& k);
     template<class InputIterator> size_type xref:#concurrent_flat_set_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      size_type xref:#concurrent_flat_set_insert_range[insert_range](R&& rg);
     size_type xref:#concurrent_flat_set_insert_initializer_list[insert](std::initializer_list<value_type> il);
 
     template<class... Args, class F> bool xref:#concurrent_flat_set_emplace_or_cvisit[emplace_or_visit](Args&&... args, F&& f);
@@ -159,6 +174,10 @@ namespace unordered {
       size_type xref:#concurrent_flat_set_insert_iterator_range_or_visit[insert_or_visit](InputIterator first, InputIterator last, F f);
     template<class InputIterator,class F>
       size_type xref:#concurrent_flat_set_insert_iterator_range_or_visit[insert_or_cvisit](InputIterator first, InputIterator last, F f);
+    template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_flat_set_insert_range_or_visit[insert_range_or_visit](R&& rg, F f);
+    template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_flat_set_insert_range_or_visit[insert_range_or_cvisit](R&& rg, F f);
     template<class F> size_type xref:#concurrent_flat_set_insert_initializer_list_or_visit[insert_or_visit](std::initializer_list<value_type> il, F f);
     template<class F> size_type xref:#concurrent_flat_set_insert_initializer_list_or_visit[insert_or_cvisit](std::initializer_list<value_type> il, F f);
 
@@ -176,6 +195,10 @@ namespace unordered {
       size_type xref:#concurrent_flat_set_insert_iterator_range_and_visit[insert_and_visit](InputIterator first, InputIterator last, F1 f1, F2 f2);
     template<class InputIterator,class F1, class F2>
       size_type xref:#concurrent_flat_set_insert_iterator_range_and_visit[insert_and_cvisit](InputIterator first, InputIterator last, F1 f1, F2 f2);
+    template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_flat_set_insert_range_and_visit[insert_range_and_visit](R&& rg, F1 f1, F2 f2);
+    template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_flat_set_insert_range_and_visit[insert_range_and_cvisit](R&& rg, F1 f1, F2 f2);
     template<class F1, class F2>
       size_type xref:#concurrent_flat_set_insert_initializer_list_and_visit[insert_and_visit](std::initializer_list<value_type> il, F1 f1, F2 f2);
     template<class F1, class F2>
@@ -236,6 +259,16 @@ namespace unordered {
                         Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> concurrent_flat_set<xref:#concurrent_flat_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#concurrent_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    concurrent_flat_set(FromRangeT&&, R&&,
+                        typename xref:#concurrent_flat_set_deduction_guides[__see below__]::size_type = xref:#concurrent_flat_set_deduction_guides[__see below__], Hash = Hash(),
+                        Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_set<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     concurrent_flat_set(std::initializer_list<T>, typename xref:#concurrent_flat_set_deduction_guides[__see below__]::size_type = xref:#concurrent_flat_set_deduction_guides[__see below__],
@@ -260,6 +293,27 @@ namespace unordered {
       -> concurrent_flat_set<xref:#concurrent_flat_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                              std::equal_to<xref:#concurrent_flat_set_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#concurrent_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_flat_set(FromRangeT&&, R&&, typename xref:#concurrent_flat_set_deduction_guides[__see below__]::size_type, Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+                             boost::hash<std::ranges::range_value_t<R>>,
+                             std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#concurrent_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_flat_set(FromRangeT&&, R&&, Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>, 
+                             boost::hash<std::ranges::range_value_t<R>>,
+                             std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#concurrent_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    concurrent_flat_set(FromRangeT&&, R&&, typename xref:#concurrent_flat_set_deduction_guides[__see below__]::size_type, Hash,
+                        Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+                             Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
   template<class T, class Allocator>
     concurrent_flat_set(std::initializer_list<T>, typename xref:#concurrent_flat_set_deduction_guides[__see below__]::size_type, Allocator)
       -> concurrent_flat_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -391,6 +445,15 @@ Chunk size internally used in xref:concurrent_flat_set_bulk_visit[bulk visit] op
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 concurrent_flat_set();
@@ -538,6 +601,27 @@ Complexity:;; O(`bucket_count()`)
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_set(FromRangeT&&, R&& rg,
+                      size_type n = _implementation-defined_,
+                      const hasher& hf = hasher(),
+                      const key_equal& eql = key_equal(),
+                      const allocator_type& a = allocator_type());
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -610,6 +694,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_set(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty table using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_set(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_flat_set(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                      const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -643,7 +779,7 @@ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const has
                     const allocator_type& a);
 ```
 
-Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate,and inserts the elements from `il` into it.
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -866,8 +1002,7 @@ size_type size() const noexcept;
 
 [horizontal]
 Returns:;; The number of elements in the table.
-
+Complexity:;; Constant time.
-[horizontal]
 Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect
 the true size of the table right after execution.
 
@@ -964,6 +1099,24 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) this->xref:#concurrent_flat_set_emplace[emplace](std::forward<decltype(x)>(x));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List
 ```c++
 size_type insert(std::initializer_list<value_type> il);
@@ -1071,6 +1224,27 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range or Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) 
+    this->xref:#concurrent_flat_set_emplace_or_cvisit[emplace_or_[c\]visit](std::forward<decltype(x)>(x), std::ref(f));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List or Visit
 ```c++
 template<class F> size_type insert_or_visit(std::initializer_list<value_type> il, F f);
@@ -1185,6 +1359,28 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range and Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2);
+template<xref:#concurrent_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg)
+    this->xref:#concurrent_flat_set_emplace_and_cvisit[emplace_and_[c\]visit](
+      std::forward<decltype(x)>(x), std::ref(f1), std::ref(f2));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List and Visit
 ```c++
 template<class F1, class F2>
@@ -1517,6 +1713,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/concurrent_node_map.adoc

@@ -80,6 +80,12 @@ namespace unordered {
     xref:#concurrent_node_map_copy_constructor_with_allocator[concurrent_node_map](const concurrent_node_map& other, const Allocator& a);
     xref:#concurrent_node_map_move_constructor_with_allocator[concurrent_node_map](concurrent_node_map&& other, const Allocator& a);
     xref:#concurrent_node_map_move_constructor_from_unordered_node_map[concurrent_node_map](unordered_node_map<Key, T, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_map_range_constructor[concurrent_node_map](FromRangeT&&, R&& rg,
+                          size_type n = _implementation-defined_,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& a = allocator_type());
     xref:#concurrent_node_map_initializer_list_constructor[concurrent_node_map](std::initializer_list<value_type> il,
                         size_type n = _implementation-defined_
                         const hasher& hf = hasher(),
@@ -93,6 +99,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#concurrent_node_map_iterator_range_constructor_with_bucket_count_and_hasher[concurrent_node_map](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                           const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_map_range_constructor_with_allocator[concurrent_node_map](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_map_range_constructor_with_bucket_count_and_allocator[concurrent_node_map](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_map_range_constructor_with_bucket_count_and_hasher_and_allocator[concurrent_node_map](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                          const allocator_type& a);
     xref:#concurrent_node_map_initializer_list_constructor_with_allocator[concurrent_node_map](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#concurrent_node_map_initializer_list_constructor_with_bucket_count_and_allocator[concurrent_node_map](std::initializer_list<value_type> il, size_type n,
                         const allocator_type& a);
@@ -155,6 +168,8 @@ namespace unordered {
     bool xref:#concurrent_node_map_move_insert[insert](value_type&& obj);
     bool xref:#concurrent_node_map_move_insert[insert](init_type&& obj);
     template<class InputIterator> size_type xref:#concurrent_node_map_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      size_type xref:#concurrent_node_map_insert_range[insert_range](R&& rg);
     size_type xref:#concurrent_node_map_insert_initializer_list[insert](std::initializer_list<value_type> il);
     insert_return_type xref:#concurrent_node_map_insert_node[insert](node_type&& nh);
 
@@ -172,6 +187,10 @@ namespace unordered {
       size_type xref:#concurrent_node_map_insert_iterator_range_or_visit[insert_or_visit](InputIterator first, InputIterator last, F f);
     template<class InputIterator,class F>
       size_type xref:#concurrent_node_map_insert_iterator_range_or_visit[insert_or_cvisit](InputIterator first, InputIterator last, F f);
+    template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_node_map_insert_range_or_visit[insert_range_or_visit](R&& rg, F f);
+    template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_node_map_insert_range_or_visit[insert_range_or_cvisit](R&& rg, F f);
     template<class F> size_type xref:#concurrent_node_map_insert_initializer_list_or_visit[insert_or_visit](std::initializer_list<value_type> il, F f);
     template<class F> size_type xref:#concurrent_node_map_insert_initializer_list_or_visit[insert_or_cvisit](std::initializer_list<value_type> il, F f);
     template<class F> insert_return_type xref:#concurrent_node_map_insert_node_or_visit[insert_or_visit](node_type&& nh, F f);
@@ -193,6 +212,10 @@ namespace unordered {
       size_type xref:#concurrent_node_map_insert_iterator_range_and_visit[insert_and_visit](InputIterator first, InputIterator last, F1 f1, F2 f2);
     template<class InputIterator,class F1, class F2>
       size_type xref:#concurrent_node_map_insert_iterator_range_and_visit[insert_and_cvisit](InputIterator first, InputIterator last, F1 f1, F2 f2);
+    template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_node_map_insert_range_and_visit[insert_range_and_visit](R&& rg, F1 f1, F2 f2);
+    template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_node_map_insert_range_and_visit[insert_range_and_cvisit](R&& rg, F1 f1, F2 f2);
     template<class F1, class F2>
       size_type xref:#concurrent_node_map_insert_initializer_list_and_visit[insert_and_visit](std::initializer_list<value_type> il, F1 f1, F2 f2);
     template<class F1, class F2>
@@ -300,6 +323,17 @@ namespace unordered {
       -> concurrent_node_map<xref:#concurrent_node_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#concurrent_node_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                              Pred, Allocator>;
 
+  template<xref:#concurrent_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#concurrent_node_map_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    concurrent_node_map(FromRangeT&&, R&&,
+                        typename xref:#concurrent_node_map_deduction_guides[__see below__]::size_type = xref:#concurrent_node_map_deduction_guides[__see below__], Hash = Hash(),
+                        Pred = Pred(), Allocator = Allocator())
+      -> concurrent_node_map<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                             Hash, Pred,Allocator>;
+
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
            class Allocator = std::allocator<std::pair<const Key, T>>>
@@ -326,6 +360,27 @@ namespace unordered {
       -> concurrent_node_map<xref:#concurrent_node_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#concurrent_node_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                              std::equal_to<xref:#concurrent_node_map_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#concurrent_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_node_map(FromRangeT&&, R&&, typename xref:#concurrent_node_map_deduction_guides[__see below__]::size_type, Allocator)
+      -> concurrent_node_map<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#concurrent_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_node_map(FromRangeT&&, R&&, Allocator)
+      -> concurrent_node_map<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#concurrent_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    concurrent_node_map(FromRangeT&&, R&&, typename xref:#concurrent_node_map_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> concurrent_node_map<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, std::equal_to<xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     concurrent_node_map(std::initializer_list<std::pair<Key, T>>, typename xref:#concurrent_node_map_deduction_guides[__see below__]::size_type,
                         Allocator)
@@ -496,6 +551,15 @@ Chunk size internally used in xref:concurrent_node_map_bulk_visit[bulk visit] op
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 concurrent_node_map();
@@ -643,6 +707,27 @@ Complexity:;; O(`bucket_count()`)
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_map(FromRangeT&&, R&& rg,
+                      size_type n = _implementation-defined_,
+                      const hasher& hf = hasher(),
+                      const key_equal& eql = key_equal(),
+                      const allocator_type& a = allocator_type());
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -715,6 +800,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_map(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty table using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_map(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_map(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                     const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -977,8 +1114,7 @@ size_type size() const noexcept;
 
 [horizontal]
 Returns:;; The number of elements in the table.
-
+Complexity:;; Constant time.
-[horizontal]
 Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect
 the true size of the table right after execution.
 
@@ -1060,6 +1196,24 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) this->xref:#concurrent_node_map_emplace[emplace](std::forward<decltype(x)>(x));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List
 ```c++
 size_type insert(std::initializer_list<value_type> il);
@@ -1171,6 +1325,27 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range or Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) 
+    this->xref:#concurrent_node_map_emplace_or_cvisit[emplace_or_[c\]visit](std::forward<decltype(x)>(x), std::ref(f));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List or Visit
 ```c++
 template<class F> size_type insert_or_visit(std::initializer_list<value_type> il, F f);
@@ -1290,6 +1465,28 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range and Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2);
+template<xref:#concurrent_node_map_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg)
+    this->xref:#concurrent_node_map_emplace_and_cvisit[emplace_and_[c\]visit](
+      std::forward<decltype(x)>(x), std::ref(f1), std::ref(f2));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List and Visit
 ```c++
 template<class F1, class F2>
@@ -1859,6 +2056,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#concurrent_node_map_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#concurrent_node_map_range_key_type[__range-key-type__]<R>, xref:#concurrent_node_map_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/concurrent_node_set.adoc

@@ -75,6 +75,12 @@ namespace unordered {
     xref:#concurrent_node_set_copy_constructor_with_allocator[concurrent_node_set](const concurrent_node_set& other, const Allocator& a);
     xref:#concurrent_node_set_move_constructor_with_allocator[concurrent_node_set](concurrent_node_set&& other, const Allocator& a);
     xref:#concurrent_node_set_move_constructor_from_unordered_node_set[concurrent_node_set](unordered_node_set<Key, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_set_range_constructor[concurrent_node_set](FromRangeT&&, R&& rg,
+                          size_type n = _implementation-defined_,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& a = allocator_type());
     xref:#concurrent_node_set_initializer_list_constructor[concurrent_node_set](std::initializer_list<value_type> il,
                         size_type n = _implementation-defined_
                         const hasher& hf = hasher(),
@@ -88,6 +94,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#concurrent_node_set_iterator_range_constructor_with_bucket_count_and_hasher[concurrent_node_set](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                           const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_set_range_constructor_with_allocator[concurrent_node_set](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_set_range_constructor_with_bucket_count_and_allocator[concurrent_node_set](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#concurrent_node_set_range_constructor_with_bucket_count_and_hasher_and_allocator[concurrent_node_set](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                          const allocator_type& a);
     xref:#concurrent_node_set_initializer_list_constructor_with_allocator[concurrent_node_set](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#concurrent_node_set_initializer_list_constructor_with_bucket_count_and_allocator[concurrent_node_set](std::initializer_list<value_type> il, size_type n,
                         const allocator_type& a);
@@ -148,6 +161,8 @@ namespace unordered {
     bool xref:#concurrent_node_set_move_insert[insert](value_type&& obj);
     template<class K> bool xref:#concurrent_node_set_transparent_insert[insert](K&& k);
     template<class InputIterator> size_type xref:#concurrent_node_set_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      size_type xref:#concurrent_node_set_insert_range[insert_range](R&& rg);
     size_type xref:#concurrent_node_set_insert_initializer_list[insert](std::initializer_list<value_type> il);
     insert_return_type xref:#concurrent_node_set_insert_node[insert](node_type&& nh);
 
@@ -163,6 +178,10 @@ namespace unordered {
       size_type xref:#concurrent_node_set_insert_iterator_range_or_visit[insert_or_visit](InputIterator first, InputIterator last, F f);
     template<class InputIterator,class F>
       size_type xref:#concurrent_node_set_insert_iterator_range_or_visit[insert_or_cvisit](InputIterator first, InputIterator last, F f);
+    template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_node_set_insert_range_or_visit[insert_range_or_visit](R&& rg, F f);
+    template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+      size_type xref:#concurrent_node_set_insert_range_or_visit[insert_range_or_cvisit](R&& rg, F f);
     template<class F> size_type xref:#concurrent_node_set_insert_initializer_list_or_visit[insert_or_visit](std::initializer_list<value_type> il, F f);
     template<class F> size_type xref:#concurrent_node_set_insert_initializer_list_or_visit[insert_or_cvisit](std::initializer_list<value_type> il, F f);
     template<class F> insert_return_type xref:#concurrent_node_set_insert_node_or_visit[insert_or_visit](node_type&& nh, F f);
@@ -182,6 +201,10 @@ namespace unordered {
       size_type xref:#concurrent_node_set_insert_iterator_range_and_visit[insert_and_visit](InputIterator first, InputIterator last, F1 f1, F2 f2);
     template<class InputIterator,class F1, class F2>
       size_type xref:#concurrent_node_set_insert_iterator_range_and_visit[insert_and_cvisit](InputIterator first, InputIterator last, F1 f1, F2 f2);
+    template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_node_set_insert_range_and_visit[insert_range_and_visit](R&& rg, F1 f1, F2 f2);
+    template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+      size_type xref:#concurrent_node_set_insert_range_and_visit[insert_range_and_cvisit](R&& rg, F1 f1, F2 f2);
     template<class F1, class F2>
       size_type xref:#concurrent_node_set_insert_initializer_list_and_visit[insert_and_visit](std::initializer_list<value_type> il, F1 f1, F2 f2);
     template<class F1, class F2>
@@ -253,6 +276,16 @@ namespace unordered {
                         Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> concurrent_node_set<xref:#concurrent_node_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#concurrent_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    concurrent_node_set(FromRangeT&&, R&&,
+                        typename xref:#concurrent_node_set_deduction_guides[__see below__]::size_type = xref:#concurrent_node_set_deduction_guides[__see below__], Hash = Hash(),
+                        Pred = Pred(), Allocator = Allocator())
+      -> concurrent_node_set<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     concurrent_node_set(std::initializer_list<T>, typename xref:#concurrent_node_set_deduction_guides[__see below__]::size_type = xref:#concurrent_node_set_deduction_guides[__see below__],
@@ -277,6 +310,26 @@ namespace unordered {
       -> concurrent_node_set<xref:#concurrent_node_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                              std::equal_to<xref:#concurrent_node_set_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#concurrent_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_node_set(FromRangeT&&, R&&, typename xref:#concurrent_node_set_deduction_guides[__see below__]::size_type, Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+                             boost::hash<std::ranges::range_value_t<R>>,
+                             std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#concurrent_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    concurrent_node_set(FromRangeT&&, R&&, Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>, 
+                             boost::hash<std::ranges::range_value_t<R>>,
+                             std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#concurrent_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    concurrent_node_set(FromRangeT&&, R&&, typename xref:#concurrent_node_set_deduction_guides[__see below__]::size_type, Hash,
+                        Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+                             Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
   template<class T, class Allocator>
     concurrent_node_set(std::initializer_list<T>, typename xref:#concurrent_node_set_deduction_guides[__see below__]::size_type, Allocator)
       -> concurrent_node_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -441,6 +494,15 @@ Chunk size internally used in xref:concurrent_node_set_bulk_visit[bulk visit] op
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 concurrent_node_set();
@@ -588,6 +650,27 @@ Complexity:;; O(`bucket_count()`)
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_set(FromRangeT&&, R&& rg,
+                      size_type n = _implementation-defined_,
+                      const hasher& hf = hasher(),
+                      const key_equal& eql = key_equal(),
+                      const allocator_type& a = allocator_type());
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -660,6 +743,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_set(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty table using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_set(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  concurrent_node_set(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                      const allocator_type& a);
+----
+
+Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::concurrent::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -916,8 +1051,7 @@ size_type size() const noexcept;
 
 [horizontal]
 Returns:;; The number of elements in the table.
-
+Complexity:;; Constant time.
-[horizontal]
 Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect
 the true size of the table right after execution.
 
@@ -1009,6 +1143,25 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) this->xref:#concurrent_node_set_emplace[emplace](std::forward<decltype(x)>(x));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
+
 ==== Insert Initializer List
 ```c++
 size_type insert(std::initializer_list<value_type> il);
@@ -1129,6 +1282,27 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range or Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F>
+  size_type insert_range_or_visit(R&& rg, F f);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg) 
+    this->xref:#concurrent_node_set_emplace_or_cvisit[emplace_or_[c\]visit](std::forward<decltype(x)>(x), std::ref(f));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List or Visit
 ```c++
 template<class F> size_type insert_or_visit(std::initializer_list<value_type> il, F f);
@@ -1258,6 +1432,28 @@ Returns:;; The number of elements inserted.
 
 ---
 
+==== Insert Range and Visit
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2);
+template<xref:#concurrent_node_set_container_compatible_range[__container-compatible-range__]<value_type> R, class F1, class F2>
+  size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2);
+----
+
+Equivalent to
+[listing,subs="+macros,+quotes"]
+-----
+  for(auto&& x: rg)
+    this->xref:#concurrent_node_set_emplace_and_cvisit[emplace_and_[c\]visit](
+      std::forward<decltype(x)>(x), std::ref(f1), std::ref(f2));
+-----
+
+[horizontal]
+Returns:;; The number of elements inserted.
+
+---
+
 ==== Insert Initializer List and Visit
 ```c++
 template<class F1, class F2>
@@ -1640,6 +1836,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/header_concurrent_flat_map.adoc

@@ -19,6 +19,10 @@ namespace unordered {
            class Allocator = std::allocator<std::pair<const Key, T>>>
   class xref:reference/concurrent_flat_map.adoc#concurrent_flat_map[concurrent_flat_map];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class T, class Hash, class Pred, class Alloc>
     bool xref:reference/concurrent_flat_map.adoc#concurrent_flat_map_operator[operator++==++](const concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x,
@@ -39,7 +43,7 @@ namespace unordered {
     typename concurrent_flat_map<K, T, H, P, A>::size_type
       xref:reference/concurrent_flat_map.adoc#concurrent_flat_map_erase_if[erase_if](concurrent_flat_map<K, T, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class T,

doc/modules/ROOT/pages/reference/header_concurrent_flat_set.adoc

@@ -18,6 +18,10 @@ namespace unordered {
            class Allocator = std::allocator<Key>>
   class xref:reference/concurrent_flat_set.adoc#concurrent_flat_set[concurrent_flat_set];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class Hash, class Pred, class Alloc>
     bool xref:reference/concurrent_flat_set.adoc#concurrent_flat_set_operator[operator++==++](const concurrent_flat_set<Key, Hash, Pred, Alloc>& x,
@@ -38,7 +42,7 @@ namespace unordered {
     typename concurrent_flat_set<K, H, P, A>::size_type
       xref:reference/concurrent_flat_set.adoc#concurrent_flat_set_erase_if[erase_if](concurrent_flat_set<K, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class Hash = boost::hash<Key>,

doc/modules/ROOT/pages/reference/header_concurrent_node_map.adoc

@@ -19,6 +19,10 @@ namespace unordered {
            class Allocator = std::allocator<std::pair<const Key, T>>>
   class xref:reference/concurrent_node_map.adoc#concurrent_node_map[concurrent_node_map];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class T, class Hash, class Pred, class Alloc>
     bool xref:reference/concurrent_node_map.adoc#concurrent_node_map_operator[operator++==++](const concurrent_node_map<Key, T, Hash, Pred, Alloc>& x,
@@ -39,7 +43,7 @@ namespace unordered {
     typename concurrent_node_map<K, T, H, P, A>::size_type
       xref:reference/concurrent_node_map.adoc#concurrent_node_map_erase_if[erase_if](concurrent_node_map<K, T, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class T,

doc/modules/ROOT/pages/reference/header_concurrent_node_set.adoc

@@ -18,6 +18,10 @@ namespace unordered {
            class Allocator = std::allocator<Key>>
   class xref:reference/concurrent_node_set.adoc#concurrent_node_set[concurrent_node_set];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class Hash, class Pred, class Alloc>
     bool xref:reference/concurrent_node_set.adoc#concurrent_node_set_operator[operator++==++](const concurrent_node_set<Key, Hash, Pred, Alloc>& x,
@@ -38,7 +42,7 @@ namespace unordered {
     typename concurrent_node_set<K, H, P, A>::size_type
       xref:reference/concurrent_node_set.adoc#concurrent_node_set_erase_if[erase_if](concurrent_node_set<K, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class Hash = boost::hash<Key>,

doc/modules/ROOT/pages/reference/header_unordered_flat_map.adoc

@@ -19,6 +19,10 @@ namespace unordered {
            class Allocator = std::allocator<std::pair<const Key, T>>>
   class xref:reference/unordered_flat_map.adoc#unordered_flat_map[unordered_flat_map];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class T, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_flat_map.adoc#unordered_flat_map_operator_2[operator++==++](const unordered_flat_map<Key, T, Hash, Pred, Alloc>& x,
@@ -39,7 +43,7 @@ namespace unordered {
     typename unordered_flat_map<K, T, H, P, A>::size_type
       xref:reference/unordered_flat_map.adoc#unordered_flat_map_erase_if[erase_if](unordered_flat_map<K, T, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class T,

doc/modules/ROOT/pages/reference/header_unordered_flat_set.adoc

@@ -18,6 +18,10 @@ namespace unordered {
            class Allocator = std::allocator<Key>>
   class xref:reference/unordered_flat_set.adoc#unordered_flat_set[unordered_flat_set];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_flat_set.adoc#unordered_flat_set_operator[operator++==++](const unordered_flat_set<Key, Hash, Pred, Alloc>& x,
@@ -38,7 +42,7 @@ namespace unordered {
     typename unordered_flat_set<K, H, P, A>::size_type
       xref:reference/unordered_flat_set.adoc#unordered_flat_set_erase_if[erase_if](unordered_flat_set<K, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class Hash = boost::hash<Key>,

doc/modules/ROOT/pages/reference/header_unordered_map.adoc

@@ -20,6 +20,10 @@ namespace unordered {
            class Allocator = std::allocator<std::pair<const Key, T>>>
   class xref:reference/unordered_map.adoc#unordered_map[unordered_map];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class T, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_map.adoc#unordered_map_operator_2[operator++==++](const unordered_map<Key, T, Hash, Pred, Alloc>& x,
@@ -67,7 +71,7 @@ namespace unordered {
     typename unordered_multimap<K, T, H, P, A>::size_type
       xref:reference/unordered_multimap.adoc#unordered_multimap_erase_if[erase_if](unordered_multimap<K, T, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class T,

doc/modules/ROOT/pages/reference/header_unordered_node_map.adoc

@@ -19,6 +19,10 @@ namespace unordered {
            class Allocator = std::allocator<std::pair<const Key, T>>>
   class xref:reference/unordered_node_map.adoc#unordered_node_map[unordered_node_map];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class T, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_node_map.adoc#unordered_node_map_operator_2[operator++==++](const unordered_node_map<Key, T, Hash, Pred, Alloc>& x,
@@ -39,7 +43,7 @@ namespace unordered {
     typename unordered_node_map<K, T, H, P, A>::size_type
       xref:reference/unordered_node_map.adoc#unordered_node_map_erase_if[erase_if](unordered_node_map<K, T, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class T,

doc/modules/ROOT/pages/reference/header_unordered_node_set.adoc

@@ -18,6 +18,10 @@ namespace unordered {
            class Allocator = std::allocator<Key>>
   class xref:reference/unordered_node_set.adoc#unordered_node_set[unordered_node_set];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_node_set.adoc#unordered_node_set_operator[operator++==++](const unordered_node_set<Key, Hash, Pred, Alloc>& x,
@@ -38,7 +42,7 @@ namespace unordered {
     typename unordered_node_set<K, H, P, A>::size_type
       xref:reference/unordered_node_set.adoc#unordered_node_set_erase_if[erase_if](unordered_node_set<K, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class Hash = boost::hash<Key>,

doc/modules/ROOT/pages/reference/header_unordered_set.adoc

@@ -19,6 +19,10 @@ namespace unordered {
            class Allocator = std::allocator<Key>>
   class xref:reference/unordered_set.adoc#unordered_set[unordered_set];
 
+  // Tag for construction from ranges (pass:[C++20] and up)
+  struct from_range_t { explicit from_range_t() = default; };
+  inline constexpr from_range_t from_range{};
+
   // Equality Comparisons
   template<class Key, class Hash, class Pred, class Alloc>
     bool xref:reference/unordered_set.adoc#unordered_set_operator[operator++==++](const unordered_set<Key, Hash, Pred, Alloc>& x,
@@ -65,7 +69,7 @@ namespace unordered {
     typename unordered_multiset<K, H, P, A>::size_type
       xref:reference/unordered_multiset.adoc#unordered_multiset_erase_if[erase_if](unordered_multiset<K, H, P, A>& c, Predicate pred);
 
-  // Pmr aliases (C++17 and up)
+  // Pmr aliases (pass:[C++17] and up)
   namespace pmr {
     template<class Key,
              class Hash = boost::hash<Key>,

doc/modules/ROOT/pages/reference/unordered_flat_map.adoc

@@ -82,6 +82,12 @@ namespace unordered {
     xref:#unordered_flat_map_copy_constructor_with_allocator[unordered_flat_map](const unordered_flat_map& other, const Allocator& a);
     xref:#unordered_flat_map_move_constructor_with_allocator[unordered_flat_map](unordered_flat_map&& other, const Allocator& a);
     xref:#unordered_flat_map_move_constructor_from_concurrent_flat_map[unordered_flat_map](concurrent_flat_map<Key, T, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_map_range_constructor[unordered_flat_map](FromRangeT&&, R&& rg,
+                         size_type n = _implementation-defined_,
+                         const hasher& hf = hasher(),
+                         const key_equal& eql = key_equal(),
+                         const allocator_type& a = allocator_type());
     xref:#unordered_flat_map_initializer_list_constructor[unordered_flat_map](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_
                        const hasher& hf = hasher(),
@@ -94,6 +100,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_flat_map_iterator_range_constructor_with_bucket_count_and_hasher[unordered_flat_map](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_map_range_constructor_with_allocator[unordered_flat_map](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_map_range_constructor_with_bucket_count_and_allocator[unordered_flat_map](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_map_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_flat_map](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                         const allocator_type& a);
     xref:#unordered_flat_map_initializer_list_constructor_with_allocator[unordered_flat_map](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_flat_map_initializer_list_constructor_with_bucket_count_and_allocator[unordered_flat_map](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a);
@@ -133,6 +146,8 @@ namespace unordered {
     iterator       xref:#unordered_flat_map_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     iterator       xref:#unordered_flat_map_copy_insert_with_hint[insert](const_iterator hint, init_type&& obj);
     template<class InputIterator> void xref:#unordered_flat_map_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_flat_map_insert_range[insert_range](R&& rg);
     void xref:#unordered_flat_map_insert_initializer_list[insert](std::initializer_list<value_type>);
 
     template<class... Args>
@@ -235,6 +250,17 @@ namespace unordered {
       -> unordered_flat_map<xref:#unordered_flat_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_flat_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             Pred, Allocator>;
 
+  template<xref:#unordered_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#unordered_flat_map_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    unordered_flat_map(FromRangeT&&, R&&,
+                       typename xref:#unordered_flat_map_deduction_guides[__see below__]::size_type = xref:#unordered_flat_map_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_map<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>, xref:#unordered_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, Pred,Allocator>;
+
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
            class Allocator = std::allocator<std::pair<const Key, T>>>
@@ -261,6 +287,27 @@ namespace unordered {
       -> unordered_flat_map<xref:#unordered_flat_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_flat_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_flat_map_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_flat_map(FromRangeT&&, R&&, typename xref:#unordered_flat_map_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_flat_map<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>, xref:#unordered_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_flat_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_flat_map<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>, xref:#unordered_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_flat_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_flat_map(FromRangeT&&, R&&, typename xref:#unordered_flat_map_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_flat_map<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>, xref:#unordered_flat_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, std::equal_to<xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     unordered_flat_map(std::initializer_list<std::pair<Key, T>>, typename xref:#unordered_flat_map_deduction_guides[__see below__]::size_type,
                        Allocator)
@@ -358,6 +405,15 @@ The iterator category is at least a forward iterator.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_flat_map();
@@ -496,6 +552,27 @@ Concurrency:;; Blocking on `other`.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_map(FromRangeT&&, R&& rg,
+                     size_type n = _implementation-defined_,
+                     const hasher& hf = hasher(),
+                     const key_equal& eql = key_equal(),
+                     const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -506,7 +583,7 @@ unordered_flat_map(std::initializer_list<value_type> il,
               const allocator_type& a = allocator_type());
 ----
 
-Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a`, and inserts the elements from `il` into it.
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -568,6 +645,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_map(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_map(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_map(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                    const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -729,7 +858,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -883,6 +1013,22 @@ Notes:;; Can invalidate iterators, pointers and references, but only if the inse
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_flat_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, pointers and references, but only if the insert causes the load to be greater than the maximum load.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1444,6 +1590,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#unordered_flat_map_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#unordered_flat_map_range_key_type[__range-key-type__]<R>, xref:#unordered_flat_map_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_flat_set.adoc

@@ -12,7 +12,7 @@ array, and insertions into an already occupied bucket are diverted to available
 vicinity of the original position. This type of data layout is known as _open addressing_.
 
 As a result of its using open addressing, the interface of `boost::unordered_flat_set` deviates in
-a number of aspects from that of `boost::unordered_flat_set`/`std::unordered_flat_set`:
+a number of aspects from that of `boost::unordered_set`/`std::unordered_set`:
 
   - `value_type` must be move-constructible.
   - Pointer stability is not kept under rehashing.
@@ -76,6 +76,12 @@ namespace unordered {
     explicit xref:#unordered_flat_set_allocator_constructor[unordered_flat_set](const Allocator& a);
     xref:#unordered_flat_set_copy_constructor_with_allocator[unordered_flat_set](const unordered_flat_set& other, const Allocator& a);
     xref:#unordered_flat_set_move_constructor_from_concurrent_flat_set[unordered_flat_set](concurrent_flat_set<Key, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_set_range_constructor[unordered_flat_set](FromRangeT&&, R&& rg,
+                         size_type n = _implementation-defined_,
+                         const hasher& hf = hasher(),
+                         const key_equal& eql = key_equal(),
+                         const allocator_type& a = allocator_type());
     xref:#unordered_flat_set_initializer_list_constructor[unordered_flat_set](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_
                        const hasher& hf = hasher(),
@@ -88,6 +94,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_flat_set_iterator_range_constructor_with_bucket_count_and_hasher[unordered_flat_set](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_set_range_constructor_with_allocator[unordered_flat_set](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_set_range_constructor_with_bucket_count_and_allocator[unordered_flat_set](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_flat_set_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_flat_set](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                         const allocator_type& a);
     xref:#unordered_flat_set_initializer_list_constructor_with_allocator[unordered_flat_set](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_flat_set_initializer_list_constructor_with_bucket_count_and_allocator[unordered_flat_set](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a);
@@ -125,6 +138,8 @@ namespace unordered {
     iterator xref:#unordered_flat_set_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class K> iterator xref:#unordered_flat_set_transparent_insert_with_hint[insert](const_iterator hint, K&& k);
     template<class InputIterator> void xref:#unordered_flat_set_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_flat_set_insert_range[insert_range](R&& rg);
     void xref:#unordered_flat_set_insert_initializer_list[insert](std::initializer_list<value_type>);
 
     _convertible-to-iterator_     xref:#unordered_flat_set_erase_by_position[erase](iterator position);
@@ -192,6 +207,16 @@ namespace unordered {
                        Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_flat_set<xref:#unordered_flat_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#unordered_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    unordered_flat_set(FromRangeT&&, R&&,
+                       typename xref:#unordered_flat_set_deduction_guides[__see below__]::size_type = xref:#unordered_flat_set_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_set<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     unordered_flat_set(std::initializer_list<T>, typename xref:#unordered_flat_set_deduction_guides[__see below__]::size_type = xref:#unordered_flat_set_deduction_guides[__see below__],
@@ -216,6 +241,27 @@ namespace unordered {
       -> unordered_flat_set<xref:#unordered_flat_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_flat_set_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_flat_set(FromRangeT&&, R&&, typename xref:#unordered_flat_set_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_flat_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>, 
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_flat_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_flat_set(FromRangeT&&, R&&, typename xref:#unordered_flat_set_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+                            Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
   template<class T, class Allocator>
     unordered_flat_set(std::initializer_list<T>, typename xref:#unordered_flat_set_deduction_guides[__see below__]::size_type, Allocator)
       -> unordered_flat_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -307,6 +353,15 @@ The iterator category is at least a forward iterator.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_flat_set();
@@ -445,6 +500,27 @@ Concurrency:;; Blocking on `other`.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_set(FromRangeT&&, R&& rg,
+                     size_type n = _implementation-defined_,
+                     const hasher& hf = hasher(),
+                     const key_equal& eql = key_equal(),
+                     const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -455,7 +531,7 @@ unordered_flat_set(std::initializer_list<value_type> il,
               const allocator_type& a = allocator_type());
 ----
 
-Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a`, and inserts the elements from `il` into it.
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -517,6 +593,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_set(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_set(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_flat_set(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                     const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -550,7 +678,7 @@ unordered_flat_set(std::initializer_list<value_type> il, size_type n, const hash
                    const allocator_type& a);
 ```
 
-Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate,and inserts the elements from `il` into it.
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -678,7 +806,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -856,6 +985,22 @@ Notes:;; Can invalidate iterators, pointers and references, but only if the inse
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_flat_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, pointers and references, but only if the insert causes the load to be greater than the maximum load.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1193,6 +1338,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_map.adoc

@@ -61,8 +61,14 @@ namespace unordered {
     explicit xref:#unordered_map_allocator_constructor[unordered_map](const Allocator& a);
     xref:#unordered_map_copy_constructor_with_allocator[unordered_map](const unordered_map& other, const Allocator& a);
     xref:#unordered_map_move_constructor_with_allocator[unordered_map](unordered_map&& other, const Allocator& a);
+    template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_map_range_constructor[unordered_map](FromRangeT&&, R&& rg,
+                    size_type n = _implementation-defined_,
+                    const hasher& hf = hasher(),
+                    const key_equal& eql = key_equal(),
+                    const allocator_type& a = allocator_type());
     xref:#unordered_map_initializer_list_constructor[unordered_map](std::initializer_list<value_type> il,
-                  size_type n = _implementation-defined_
+                  size_type n = _implementation-defined_,
                   const hasher& hf = hasher(),
                   const key_equal& eql = key_equal(),
                   const allocator_type& a = allocator_type());
@@ -73,6 +79,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_map_iterator_range_constructor_with_bucket_count_and_hasher[unordered_map](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                     const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_map_range_constructor_with_allocator[unordered_map](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_map_range_constructor_with_bucket_count_and_allocator[unordered_map](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_map_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_map](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                    const allocator_type& a);
     xref:#unordered_map_initializer_list_constructor_with_allocator[unordered_map](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_map_initializer_list_constructor_with_bucket_count_and_allocator[unordered_map](std::initializer_list<value_type> il, size_type n, const allocator_type& a);
     xref:#unordered_map_initializer_list_constructor_with_bucket_count_and_hasher_and_allocator[unordered_map](std::initializer_list<value_type> il, size_type n, const hasher& hf,
@@ -109,6 +122,8 @@ namespace unordered {
     iterator       xref:#unordered_map_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class P> iterator xref:#unordered_map_emplace_insert_with_hint[insert](const_iterator hint, P&& obj);
     template<class InputIterator> void xref:#unordered_map_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_map_insert_range[insert_range](R&& rg);
     void xref:#unordered_map_insert_initializer_list[insert](std::initializer_list<value_type>);
 
     template<class... Args>
@@ -231,8 +246,19 @@ namespace unordered {
            class Allocator = std::allocator<xref:#unordered_map_iter_to_alloc_type[__iter-to-alloc-type__]<InputIterator>>>
     unordered_map(InputIterator, InputIterator, typename xref:#unordered_map_deduction_guides[__see below__]::size_type = xref:#unordered_map_deduction_guides[__see below__],
                   Hash = Hash(), Pred = Pred(), Allocator = Allocator())
-      -> unordered_map<xref:#unordered_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash, Pred,
+      -> unordered_map<xref:#unordered_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, 
-                       Allocator>;
+                       Hash, Pred, Allocator>;
+
+  template<xref:#unordered_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#unordered_map_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#unordered_map_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#unordered_map_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    unordered_map(FromRangeT&&, R&&,
+                  typename xref:#unordered_map_deduction_guides[__see below__]::size_type = xref:#unordered_map_deduction_guides[__see below__], Hash = Hash(),
+                  Pred = Pred(), Allocator = Allocator())
+      -> unordered_map<xref:#unordered_map_range_key_type[__range-key-type__]<R>, xref:#unordered_map_range_mapped_type[__range-mapped-type__]<R>,
+                       Hash, Pred,Allocator>;
 
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
@@ -259,6 +285,27 @@ namespace unordered {
       -> unordered_map<xref:#unordered_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                        std::equal_to<xref:#unordered_map_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_map(FromRangeT&&, R&&, typename xref:#unordered_map_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_map<xref:#unordered_map_range_key_type[__range-key-type__]<R>, xref:#unordered_map_range_mapped_type[__range-mapped-type__]<R>,
+                       boost::hash<xref:#unordered_map_range_key_type[__range-key-type__]<R>>,
+                       std::equal_to<xref:#unordered_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_map<xref:#unordered_map_range_key_type[__range-key-type__]<R>, xref:#unordered_map_range_mapped_type[__range-mapped-type__]<R>,
+                       boost::hash<xref:#unordered_map_range_key_type[__range-key-type__]<R>>,
+                       std::equal_to<xref:#unordered_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_map(FromRangeT&&, R&&, typename xref:#unordered_map_deduction_guides[__see below__]::size_type, Hash,
+                  Allocator)
+      -> unordered_map<xref:#unordered_map_range_key_type[__range-key-type__]<R>, xref:#unordered_map_range_mapped_type[__range-mapped-type__]<R>,
+                       Hash, std::equal_to<xref:#unordered_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     unordered_map(std::initializer_list<std::pair<Key, T>>, typename xref:#unordered_map_deduction_guides[__see below__]::size_type,
                   Allocator)
@@ -397,6 +444,15 @@ with `Iterator` = `iterator` and `NodeType` = `node_type`.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_map();
@@ -519,11 +575,32 @@ Requires:;; `value_type` is move insertable.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_map(FromRangeT&&, R&& rg,
+                size_type n = _implementation-defined_,
+                const hasher& hf = hasher(),
+                const key_equal& eql = key_equal(),
+                const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `a` as the allocator and a maximum load factor of `1.0` and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
 unordered_map(std::initializer_list<value_type> il,
-              size_type n = _implementation-defined_
+              size_type n = _implementation-defined_,
               const hasher& hf = hasher(),
               const key_equal& eql = key_equal(),
               const allocator_type& a = allocator_type());
@@ -591,6 +668,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_map(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_map(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_map(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -749,7 +878,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -943,6 +1073,24 @@ Pointers and references to elements are never invalidated.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. +
++
+Pointers and references to elements are never invalidated.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1696,6 +1844,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#unordered_map_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#unordered_map_range_key_type[__range-key-type__]<R>, xref:#unordered_map_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_multimap.adoc

@@ -60,6 +60,12 @@ namespace unordered {
     explicit xref:#unordered_multimap_allocator_constructor[unordered_multimap](const Allocator& a);
     xref:#unordered_multimap_copy_constructor_with_allocator[unordered_multimap](const unordered_multimap& other, const Allocator& a);
     xref:#unordered_multimap_move_constructor_with_allocator[unordered_multimap](unordered_multimap&& other, const Allocator& a);
+    template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multimap_range_constructor[unordered_multimap](FromRangeT&&, R&& rg,
+                    size_type n = _implementation-defined_,
+                    const hasher& hf = hasher(),
+                    const key_equal& eql = key_equal(),
+                    const allocator_type& a = allocator_type());
     xref:#unordered_multimap_initializer_list_constructor[unordered_multimap](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_,
                        const hasher& hf = hasher(),
@@ -72,6 +78,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_multimap_iterator_range_constructor_with_bucket_count_and_hasher[unordered_multimap](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multimap_range_constructor_with_allocator[unordered_multimap](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multimap_range_constructor_with_bucket_count_and_allocator[unordered_multimap](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multimap_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_multimap](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                    const allocator_type& a);
     xref:#unordered_multimap_initializer_list_constructor_with_allocator[unordered_multimap](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_multimap_initializer_list_constructor_with_bucket_count_and_allocator[unordered_multimap](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a);
@@ -109,6 +122,8 @@ namespace unordered {
     iterator xref:#unordered_multimap_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class P> iterator xref:#unordered_multimap_emplace_insert_with_hint[insert](const_iterator hint, P&& obj);
     template<class InputIterator> void xref:#unordered_multimap_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_multimap_insert_range[insert_range](R&& rg);
     void xref:#unordered_multimap_insert_initializer_list[insert](std::initializer_list<value_type> il);
 
     node_type xref:#unordered_multimap_extract_by_iterator[extract](const_iterator position);
@@ -200,6 +215,17 @@ namespace unordered {
       -> unordered_multimap<xref:#unordered_multimap_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_multimap_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             Pred, Allocator>;
 
+  template<xref:#unordered_multimap_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#unordered_multimap_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    unordered_multimap(FromRangeT&&, R&&,
+                       typename xref:#unordered_multimap_deduction_guides[__see below__]::size_type = xref:#unordered_multimap_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_multimap<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>, xref:#unordered_multimap_range_mapped_type[__range-mapped-type__]<R>,
+                       Hash, Pred,Allocator>;
+
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
            class Allocator = std::allocator<std::pair<const Key, T>>>
@@ -226,6 +252,27 @@ namespace unordered {
       -> unordered_multimap<xref:#unordered_multimap_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_multimap_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_multimap_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_multimap_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_multimap(FromRangeT&&, R&&, typename xref:#unordered_multimap_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_multimap<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>, xref:#unordered_multimap_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_multimap_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_multimap(FromRangeT&&, R&&, Allocator)
+      -> unordered_multimap<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>, xref:#unordered_multimap_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_multimap_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_multimap(FromRangeT&&, R&&, typename xref:#unordered_multimap_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_multimap<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>, xref:#unordered_multimap_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, std::equal_to<xref:#unordered_multimap_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     unordered_multimap(std::initializer_list<std::pair<Key, T>>, typename xref:#unordered_multimap_deduction_guides[__see below__]::size_type,
                        Allocator)
@@ -341,6 +388,15 @@ See node_handle_map for details.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_multimap();
@@ -463,6 +519,27 @@ Requires:;; `value_type` is move insertable.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multimap(FromRangeT&&, R&& rg,
+                size_type n = _implementation-defined_,
+                const hasher& hf = hasher(),
+                const key_equal& eql = key_equal(),
+                const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `a` as the allocator and a maximum load factor of `1.0` and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -534,6 +611,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multimap(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multimap(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multimap(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -692,7 +821,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -873,6 +1003,25 @@ Pointers and references to elements are never invalidated.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_multimap_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. +
++
+Pointers and references to elements are never invalidated.
+
+---
+
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type> il);
@@ -1413,6 +1562,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#unordered_multimap_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#unordered_multimap_range_key_type[__range-key-type__]<R>, xref:#unordered_multimap_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_multiset.adoc

@@ -58,6 +58,12 @@ namespace unordered {
     explicit xref:#unordered_multiset_allocator_constructor[unordered_multiset](const Allocator& a);
     xref:#unordered_multiset_copy_constructor_with_allocator[unordered_multiset](const unordered_multiset& other, const Allocator& a);
     xref:#unordered_multiset_move_constructor_with_allocator[unordered_multiset](unordered_multiset&& other, const Allocator& a);
+    template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multiset_range_constructor[unordered_multiset](FromRangeT&&, R&& rg,
+                         size_type n = _implementation-defined_,
+                         const hasher& hf = hasher(),
+                         const key_equal& eql = key_equal(),
+                         const allocator_type& a = allocator_type());
     xref:#unordered_multiset_initializer_list_constructor[unordered_multiset](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_,
                        const hasher& hf = hasher(),
@@ -70,6 +76,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_multiset_iterator_range_constructor_with_bucket_count_and_hasher[unordered_multiset](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multiset_range_constructor_with_allocator[unordered_multiset](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multiset_range_constructor_with_bucket_count_and_allocator[unordered_multiset](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_multiset_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_multiset](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                         const allocator_type& a);
     xref:#unordered_multiset_initializer_list_constructor_with_allocator[unordered_multiset](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_multiset_initializer_list_constructor_with_bucket_count_and_allocator[unordered_multiset](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a)
@@ -105,6 +118,8 @@ namespace unordered {
     iterator xref:#unordered_multiset_copy_insert_with_hint[insert](const_iterator hint, const value_type& obj);
     iterator xref:#unordered_multiset_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class InputIterator> void xref:#unordered_multiset_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_multiset_insert_range[insert_range](R&& rg);
     void xref:#unordered_multiset_insert_initializer_list[insert](std::initializer_list<value_type> il);
 
     node_type xref:#unordered_multiset_extract_by_iterator[extract](const_iterator position);
@@ -195,6 +210,16 @@ namespace unordered {
                        Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_multiset<xref:#unordered_multiset_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#unordered_multiset_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    unordered_multiset(FromRangeT&&, R&&,
+                       typename xref:#unordered_multiset_deduction_guides[__see below__]::size_type = xref:#unordered_multiset_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_multiset<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     unordered_multiset(std::initializer_list<T>, typename xref:#unordered_multiset_deduction_guides[__see below__]::size_type = xref:#unordered_multiset_deduction_guides[__see below__],
@@ -219,6 +244,27 @@ namespace unordered {
       -> unordered_multiset<xref:#unordered_multiset_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_multiset_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_multiset_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_multiset(FromRangeT&&, R&&, typename xref:#unordered_multiset_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_multiset_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_multiset(FromRangeT&&, R&&, Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>, 
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_multiset_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_multiset(FromRangeT&&, R&&, typename xref:#unordered_multiset_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+                            Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
   template<class T, class Allocator>
     unordered_multiset(std::initializer_list<T>, typename xref:#unordered_multiset_deduction_guides[__see below__]::size_type, Allocator)
       -> unordered_multiset<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -329,6 +375,15 @@ See node_handle_set for details.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_multiset();
@@ -451,6 +506,27 @@ Requires:;; `value_type` is move insertable.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multiset(FromRangeT&&, R&& rg,
+                size_type n = _implementation-defined_,
+                const hasher& hf = hasher(),
+                const key_equal& eql = key_equal(),
+                const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `a` as the allocator and a maximum load factor of `1.0` and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -523,6 +599,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multiset(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multiset(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_multiset(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                     const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -683,7 +811,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -830,12 +959,30 @@ Pointers and references to elements are never invalidated.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_multiset_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. 
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. +
++
+Pointers and references to elements are never invalidated.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type> il);
 ```
 
-Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+Inserts a range of elements into the container. 
 
 [horizontal]
 Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container.
@@ -1345,6 +1492,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_node_map.adoc

@@ -81,6 +81,12 @@ namespace unordered {
     xref:#unordered_node_map_copy_constructor_with_allocator[unordered_node_map](const unordered_node_map& other, const Allocator& a);
     xref:#unordered_node_map_move_constructor_with_allocator[unordered_node_map](unordered_node_map&& other, const Allocator& a);
     xref:#unordered_node_map_move_constructor_from_concurrent_node_map[unordered_node_map](concurrent_node_map<Key, T, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_map_range_constructor[unordered_node_map](FromRangeT&&, R&& rg,
+                         size_type n = _implementation-defined_,
+                         const hasher& hf = hasher(),
+                         const key_equal& eql = key_equal(),
+                         const allocator_type& a = allocator_type());
     xref:#unordered_node_map_initializer_list_constructor[unordered_node_map](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_
                        const hasher& hf = hasher(),
@@ -93,6 +99,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_node_map_iterator_range_constructor_with_bucket_count_and_hasher[unordered_node_map](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_map_range_constructor_with_allocator[unordered_node_map](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_map_range_constructor_with_bucket_count_and_allocator[unordered_node_map](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_map_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_node_map](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                         const allocator_type& a);
     xref:#unordered_node_map_initializer_list_constructor_with_allocator[unordered_node_map](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_node_map_initializer_list_constructor_with_bucket_count_and_allocator[unordered_node_map](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a);
@@ -132,6 +145,8 @@ namespace unordered {
     iterator       xref:#unordered_node_map_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     iterator       xref:#unordered_node_map_copy_insert_with_hint[insert](const_iterator hint, init_type&& obj);
     template<class InputIterator> void xref:#unordered_node_map_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_node_map_insert_range[insert_range](R&& rg);
     void xref:#unordered_node_map_insert_initializer_list[insert](std::initializer_list<value_type>);
     insert_return_type xref:#unordered_node_map_insert_node[insert](node_type&& nh);
     iterator xref:#unordered_node_map_insert_node_with_hint[insert](const_iterator hint, node_type&& nh);
@@ -239,6 +254,17 @@ namespace unordered {
       -> unordered_node_map<xref:#unordered_node_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_node_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             Pred, Allocator>;
 
+  template<xref:#unordered_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>,
+           class Pred = std::equal_to<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>,
+           class Allocator = std::allocator<xref:#unordered_node_map_range_to_alloc_type[__range-to-alloc-type__]<R>>>
+    unordered_node_map(FromRangeT&&, R&&,
+                       typename xref:#unordered_node_map_deduction_guides[__see below__]::size_type = xref:#unordered_node_map_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_map<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>, xref:#unordered_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, Pred,Allocator>;
+
   template<class Key, class T, class Hash = boost::hash<Key>,
            class Pred = std::equal_to<Key>,
            class Allocator = std::allocator<std::pair<const Key, T>>>
@@ -265,6 +291,27 @@ namespace unordered {
       -> unordered_node_map<xref:#unordered_node_map_iter_key_type[__iter-key-type__]<InputIterator>, xref:#unordered_node_map_iter_mapped_type[__iter-mapped-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_node_map_iter_key_type[__iter-key-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_node_map(FromRangeT&&, R&&, typename xref:#unordered_node_map_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_node_map<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>, xref:#unordered_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_node_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_node_map<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>, xref:#unordered_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            boost::hash<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>,
+                            std::equal_to<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
+  template<xref:#unordered_node_map_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_node_map(FromRangeT&&, R&&, typename xref:#unordered_node_map_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_node_map<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>, xref:#unordered_node_map_range_mapped_type[__range-mapped-type__]<R>,
+                            Hash, std::equal_to<xref:#unordered_node_map_range_key_type[__range-key-type__]<R>>, Allocator>;
+
   template<class Key, class T, class Allocator>
     unordered_node_map(std::initializer_list<std::pair<Key, T>>, typename xref:#unordered_node_map_deduction_guides[__see below__]::size_type,
                        Allocator)
@@ -395,6 +442,15 @@ with `Iterator` = `iterator` and `NodeType` = `node_type`.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_node_map();
@@ -530,6 +586,27 @@ Concurrency:;; Blocking on `other`.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_map(FromRangeT&&, R&& rg,
+                     size_type n = _implementation-defined_,
+                     const hasher& hf = hasher(),
+                     const key_equal& eql = key_equal(),
+                     const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -540,7 +617,7 @@ unordered_node_map(std::initializer_list<value_type> il,
               const allocator_type& a = allocator_type());
 ----
 
-Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a`, and inserts the elements from `il` into it.
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -602,6 +679,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_map(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_map(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_map(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                    const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -763,7 +892,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -917,6 +1047,22 @@ Notes:;; Can invalidate iterators, but only if the insert causes the load to be
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_node_map_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1548,6 +1694,42 @@ template<class InputIterator>
     std::tuple_element_t<1, xref:#unordered_node_map_iter_value_type[__iter-value-type__]<InputIterator>>>; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
+==== __range-key-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-key-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<0, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-mapped-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-mapped-type__ =
+    std::remove_cvref_t<
+      std::tuple_element_t<1, std::ranges::range_value_t<R>>>; // exposition only
+-----
+
+==== __range-to-alloc-type__
+[listings,subs="+macros,+quotes"]
+-----
+template<std::ranges::input_range R>
+  using __range-to-alloc-type__ = 
+    std::pair<const xref:#unordered_node_map_range_key_type[__range-key-type__]<R>, xref:#unordered_node_map_range_mapped_type[__range-mapped-type__]<R>>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_node_set.adoc

@@ -76,6 +76,12 @@ namespace unordered {
     xref:#unordered_node_set_copy_constructor_with_allocator[unordered_node_set](const unordered_node_set& other, const Allocator& a);
     xref:#unordered_node_set_move_constructor_with_allocator[unordered_node_set](unordered_node_set&& other, const Allocator& a);
     xref:#unordered_node_set_move_constructor_from_concurrent_node_set[unordered_node_set](concurrent_node_set<Key, Hash, Pred, Allocator>&& other);
+    template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_set_range_constructor[unordered_node_set](FromRangeT&&, R&& rg,
+                         size_type n = _implementation-defined_,
+                         const hasher& hf = hasher(),
+                         const key_equal& eql = key_equal(),
+                         const allocator_type& a = allocator_type());
     xref:#unordered_node_set_initializer_list_constructor[unordered_node_set](std::initializer_list<value_type> il,
                        size_type n = _implementation-defined_
                        const hasher& hf = hasher(),
@@ -88,6 +94,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_node_set_iterator_range_constructor_with_bucket_count_and_hasher[unordered_node_set](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                          const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_set_range_constructor_with_allocator[unordered_node_set](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_set_range_constructor_with_bucket_count_and_allocator[unordered_node_set](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_node_set_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_node_set](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                         const allocator_type& a);
     xref:#unordered_node_set_initializer_list_constructor_with_allocator[unordered_node_set](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_node_set_initializer_list_constructor_with_bucket_count_and_allocator[unordered_node_set](std::initializer_list<value_type> il, size_type n,
                        const allocator_type& a);
@@ -125,6 +138,8 @@ namespace unordered {
     iterator xref:#unordered_node_set_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class K> iterator xref:#unordered_node_set_transparent_insert_with_hint[insert](const_iterator hint, K&& k);
     template<class InputIterator> void xref:#unordered_node_set_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_node_set_insert_range[insert_range](R&& rg);
     void xref:#unordered_node_set_insert_initializer_list[insert](std::initializer_list<value_type>);
     insert_return_type xref:#unordered_node_set_insert_node[insert](node_type&& nh);
     iterator xref:#unordered_node_set_insert_node_with_hint[insert](const_iterator hint, node_type&& nh);
@@ -197,6 +212,16 @@ namespace unordered {
                        Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_node_set<xref:#unordered_node_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#unordered_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    unordered_node_set(FromRangeT&&, R&&,
+                       typename xref:#unordered_node_set_deduction_guides[__see below__]::size_type = xref:#unordered_node_set_deduction_guides[__see below__], Hash = Hash(),
+                       Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_set<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     unordered_node_set(std::initializer_list<T>, typename xref:#unordered_node_set_deduction_guides[__see below__]::size_type = xref:#unordered_node_set_deduction_guides[__see below__],
@@ -221,6 +246,27 @@ namespace unordered {
       -> unordered_node_set<xref:#unordered_node_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                             std::equal_to<xref:#unordered_node_set_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_node_set(FromRangeT&&, R&&, typename xref:#unordered_node_set_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_node_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>, 
+                            boost::hash<std::ranges::range_value_t<R>>,
+                            std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_node_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_node_set(FromRangeT&&, R&&, typename xref:#unordered_node_set_deduction_guides[__see below__]::size_type, Hash,
+                       Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+                            Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
   template<class T, class Allocator>
     unordered_node_set(std::initializer_list<T>, typename xref:#unordered_node_set_deduction_guides[__see below__]::size_type, Allocator)
       -> unordered_node_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -345,6 +391,15 @@ with `Iterator` = `iterator` and `NodeType` = `node_type`.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
 ==== Default Constructor
 ```c++
 unordered_node_set();
@@ -483,6 +538,27 @@ Concurrency:;; Blocking on `other`.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_set(FromRangeT&&, R&& rg,
+                     size_type n = _implementation-defined_,
+                     const hasher& hf = hasher(),
+                     const key_equal& eql = key_equal(),
+                     const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -555,6 +631,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_set(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_set(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` and default hash function and key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_node_set(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                     const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -588,7 +716,7 @@ unordered_node_set(std::initializer_list<value_type> il, size_type n, const hash
                    const allocator_type& a);
 ```
 
-Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate,and inserts the elements from `il` into it.
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate, and inserts the elements from `il` into it.
 
 [horizontal]
 Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
@@ -716,7 +844,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -894,6 +1023,22 @@ Notes:;; Can invalidate iterators, but only if the insert causes the load to be
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_node_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1301,6 +1446,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/modules/ROOT/pages/reference/unordered_set.adoc

@@ -59,6 +59,12 @@ namespace unordered {
     explicit xref:#unordered_set_allocator_constructor[unordered_set](const Allocator& a);
     xref:#unordered_set_copy_constructor_with_allocator[unordered_set](const unordered_set& other, const Allocator& a);
     xref:#unordered_set_move_constructor_with_allocator[unordered_set](unordered_set&& other, const Allocator& a);
+    template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_set_range_constructor[unordered_set](FromRangeT&&, R&& rg,
+                    size_type n = _implementation-defined_,
+                    const hasher& hf = hasher(),
+                    const key_equal& eql = key_equal(),
+                    const allocator_type& a = allocator_type());
     xref:#unordered_set_initializer_list_constructor[unordered_set](std::initializer_list<value_type> il,
                   size_type n = _implementation-defined_,
                   const hasher& hf = hasher(),
@@ -71,6 +77,13 @@ namespace unordered {
     template<class InputIterator>
       xref:#unordered_set_iterator_range_constructor_with_bucket_count_and_hasher[unordered_set](InputIterator f, InputIterator l, size_type n, const hasher& hf,
                     const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_set_range_constructor_with_allocator[unordered_set](FromRangeT&&, R&& rg, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_set_range_constructor_with_bucket_count_and_allocator[unordered_set](FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+    template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      xref:#unordered_set_range_constructor_with_bucket_count_and_hasher_and_allocator[unordered_set](FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                    const allocator_type& a);
     xref:#unordered_set_initializer_list_constructor_with_allocator[unordered_set](std::initializer_list<value_type> il, const allocator_type& a);
     xref:#unordered_set_initializer_list_constructor_with_bucket_count_and_allocator[unordered_set](std::initializer_list<value_type> il, size_type n, const allocator_type& a);
     xref:#unordered_set_initializer_list_constructor_with_bucket_count_and_hasher_and_allocator[unordered_set](std::initializer_list<value_type> il, size_type n, const hasher& hf,
@@ -107,6 +120,8 @@ namespace unordered {
     iterator xref:#unordered_set_move_insert_with_hint[insert](const_iterator hint, value_type&& obj);
     template<class K> iterator xref:#unordered_set_transparent_insert_with_hint[insert](const_iterator hint, K&& k);
     template<class InputIterator> void xref:#unordered_set_insert_iterator_range[insert](InputIterator first, InputIterator last);
+    template<xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+      void xref:#unordered_set_insert_range[insert_range](R&& rg);
     void xref:#unordered_set_insert_initializer_list[insert](std::initializer_list<value_type>);
 
     node_type xref:#unordered_set_extract_by_iterator[extract](const_iterator position);
@@ -197,6 +212,16 @@ namespace unordered {
                   Hash = Hash(), Pred = Pred(), Allocator = Allocator())
       -> unordered_set<xref:#unordered_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash, Pred, Allocator>;
 
+  template<xref:#unordered_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R,
+           class Hash = boost::hash<std::ranges::range_value_t<R>>,
+           class Pred = std::equal_to<std::ranges::range_value_t<R>>,
+           class Allocator = std::allocator<std::ranges::range_value_t<R>>
+    unordered_set(FromRangeT&&, R&&,
+                  typename xref:#unordered_set_deduction_guides[__see below__]::size_type = xref:#unordered_set_deduction_guides[__see below__], Hash = Hash(),
+                  Pred = Pred(), Allocator = Allocator())
+      -> unordered_set<std::ranges::range_value_t<R>, Hash, Pred,Allocator>;
+
   template<class T, class Hash = boost::hash<T>, class Pred = std::equal_to<T>,
            class Allocator = std::allocator<T>>
     unordered_set(std::initializer_list<T>, typename xref:#unordered_set_deduction_guides[__see below__]::size_type = xref:#unordered_set_deduction_guides[__see below__],
@@ -220,6 +245,27 @@ namespace unordered {
       -> unordered_set<xref:#unordered_set_iter_value_type[__iter-value-type__]<InputIterator>, Hash,
                        std::equal_to<xref:#unordered_set_iter_value_type[__iter-value-type__]<InputIterator>>, Allocator>;
 
+  template<xref:#unordered_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_set(FromRangeT&&, R&&, typename xref:#unordered_set_deduction_guides[__see below__]::size_type, Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>,
+                       boost::hash<std::ranges::range_value_t<R>>,
+                       std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Allocator>
+    unordered_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>, 
+                       boost::hash<std::ranges::range_value_t<R>>,
+                       std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
+  template<xref:#unordered_set_convertible_to_from_range_t[__convertible-to-from-range_t__] FromRangeT,
+           std::ranges::input_range R, class Hash, class Allocator>
+    unordered_set(FromRangeT&&, R&&, typename xref:#unordered_set_deduction_guides[__see below__]::size_type, Hash,
+                  Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>,
+                       Hash, std::equal_to<std::ranges::range_value_t<R>>, Allocator>;
+
   template<class T, class Allocator>
     unordered_set(std::initializer_list<T>, typename xref:#unordered_set_deduction_guides[__see below__]::size_type, Allocator)
       -> unordered_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
@@ -353,6 +399,16 @@ with `Iterator` = `iterator` and `NodeType` = `node_type`.
 
 === Constructors
 
+==== __container-compatible-range__
+[listings,subs="+macros,+quotes"]
+-----
+template<class R, class T>
+  concept container_compatible_range =
+    std::ranges::input_range<R> &&
+    std::convertible_to<std::ranges::range_reference_t<R>, T>; // exposition only
+-----
+
+
 ==== Default Constructor
 ```c++
 unordered_set();
@@ -475,6 +531,27 @@ Requires:;; `value_type` is move insertable.
 
 ---
 
+==== Range Constructor
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_set(FromRangeT&&, R&& rg,
+                size_type n = _implementation-defined_,
+                const hasher& hf = hasher(),
+                const key_equal& eql = key_equal(),
+                const allocator_type& a = allocator_type());
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `a` as the allocator and a maximum load factor of `1.0` and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+
+[horizontal]
+Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== Initializer List Constructor
 [source,c++,subs="+quotes"]
 ----
@@ -547,6 +624,58 @@ Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/
 
 ---
 
+==== Range Constructor with Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_set(FromRangeT&&, R&& rg, const allocator_type& a);
+----
+
+Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_set(FromRangeT&&, R&& rg, size_type n, const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
+==== Range Constructor with Bucket Count and Hasher and Allocator
+
+[source,c++,subs="+macros,+quotes"]
+----
+template<class FromRangeT, xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  unordered_set(FromRangeT&&, R&& rg, size_type n, const hasher& hf,
+                const allocator_type& a);
+----
+
+Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `rg` into it.
+
+Only participates in overload resolution if `FromRangeT` is convertible to `std::from_range_t` or `boost::unordered::from_range_t`.
+
+[horizontal]
+Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
+
+---
+
 ==== initializer_list Constructor with Allocator
 
 ```c++
@@ -707,7 +836,8 @@ size_type size() const noexcept;
 ```
 
 [horizontal]
-Returns:;; `std::distance(begin(), end())`
+Returns:;; The number of elements in the container.
+Complexity:;; Constant time.
 
 ---
 
@@ -903,6 +1033,24 @@ Pointers and references to elements are never invalidated.
 
 ---
 
+==== Insert Range
+[source,c++,subs="+macros,+quotes"]
+----
+template<xref:#unordered_set_container_compatible_range[__container-compatible-range__]<value_type> R>
+  void insert_range(R&& rg);
+----
+
+Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
+
+[horizontal]
+Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from `*std::ranges​::​begin(rg)`.
+Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect.
+Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. +
++
+Pointers and references to elements are never invalidated.
+
+---
+
 ==== Insert Initializer List
 ```c++
 void insert(std::initializer_list<value_type>);
@@ -1423,6 +1571,16 @@ template<class InputIterator>
     typename std::iterator_traits<InputIterator>::value_type; // exposition only
 -----
 
+==== __convertible-to-from-range_t__
+[listings,subs="+macros,+quotes"]
+-----
+template<typename FromRangeT>
+  concept __convertible-to-from_range_t__ =
+    // first clause not present if std::from_range_t does not exist
+    std::is_convertible_v<FromRangeT, std::from_range_t> ||
+    std::is_convertible_v<FromRangeT, boost::unordered::from_range_t>; // exposition only
+-----
+
 === Equality Comparisons
 
 ==== operator==

doc/package.json

@@ -1,7 +1,10 @@
 {
     "devDependencies": {
-      "@antora/cli": "3.1.10",
+      "@antora/cli": ">=3.1.14",
-      "@antora/site-generator": "3.1.10",
+      "@antora/site-generator": ">=3.1.14",
-      "antora": "3.1.10"
+      "antora": ">=3.1.14"
+    },
+    "dependencies": {
+      "@cppalliance/antora-downloads-extension": "^0.0.2"
     }
   }

doc/unordered-playbook.yml

@@ -12,3 +12,7 @@ ui:
   bundle:
     url: https://github.com/boostorg/unordered-ui-bundle/raw/c80db72a7ba804256beb36e3a46d9c7df265d8d7/ui-bundle.zip
   output_dir: unordered/_
+
+antora:
+  extensions:
+    - require: '@cppalliance/antora-downloads-extension'

extra/boost_unordered_printers.py

@@ -1,4 +1,4 @@
-# Copyright 2024 Braden Ganetsky
+# Copyright 2024-2026 Braden Ganetsky
 # Distributed under the Boost Software License, Version 1.0.
 # https://www.boost.org/LICENSE_1_0.txt
 
@@ -16,8 +16,14 @@ class BoostUnorderedHelpers:
             return n
 
     def maybe_unwrap_foa_element(e):
-        if f"{e.type.strip_typedefs()}".startswith("boost::unordered::detail::foa::element_type<"):
+        # Sometimes the complex typedefs can't be resolved through a pointer
-            return e["p"]
+        if e.type.strip_typedefs().code == gdb.TYPE_CODE_PTR:
+            foa_element = e.dereference()
+        else:
+            foa_element = e
+
+        if f"{foa_element.type.strip_typedefs()}".startswith("boost::unordered::detail::foa::element_type<"):
+            return foa_element["p"]
         else:
             return e
 
@@ -45,14 +51,15 @@ class BoostUnorderedPointerCustomizationPoint:
 
 class BoostUnorderedFcaPrinter:
     def __init__(self, val):
-        self.val = BoostUnorderedHelpers.maybe_unwrap_reference(val)
+        val = BoostUnorderedHelpers.maybe_unwrap_reference(val)
-        self.name = f"{self.val.type.strip_typedefs()}".split("<")[0]
+        self.table = val["table_"]
+        self.name = f"{val.type.strip_typedefs()}".split("<")[0]
         self.name = self.name.replace("boost::unordered::", "boost::")
         self.is_map = self.name.endswith("map")
-        self.cpo = BoostUnorderedPointerCustomizationPoint(self.val["table_"]["buckets_"]["buckets"])
+        self.cpo = BoostUnorderedPointerCustomizationPoint(self.table["buckets_"]["buckets"])
 
     def to_string(self):
-        size = self.val["table_"]["size_"]
+        size = self.table["size_"]
         return f"{self.name} with {size} elements"
 
     def display_hint(self):
@@ -60,7 +67,7 @@ class BoostUnorderedFcaPrinter:
 
     def children(self):
         def generator():
-            grouped_buckets = self.val["table_"]["buckets_"]
+            grouped_buckets = self.table["buckets_"]
 
             size = grouped_buckets["size_"]
             buckets = grouped_buckets["buckets"]
@@ -154,14 +161,20 @@ class BoostUnorderedFoaCumulativeStatsPrinter:
 
 class BoostUnorderedFoaPrinter:
     def __init__(self, val):
-        self.val = BoostUnorderedHelpers.maybe_unwrap_reference(val)
+        val = BoostUnorderedHelpers.maybe_unwrap_reference(val)
-        self.name = f"{self.val.type.strip_typedefs()}".split("<")[0]
+        self.table = val["table_"]
+        self.name = f"{val.type.strip_typedefs()}".split("<")[0]
         self.name = self.name.replace("boost::unordered::", "boost::")
         self.is_map = self.name.endswith("map")
-        self.cpo = BoostUnorderedPointerCustomizationPoint(self.val["table_"]["arrays"]["groups_"])
+        self.cpo = BoostUnorderedPointerCustomizationPoint(self.table["arrays"]["groups_"])
+        self.groups = self.cpo.to_address(self.table["arrays"]["groups_"])
+        self.elements = self.cpo.to_address(self.table["arrays"]["elements_"])
+
+        self.N = 15 # `self.groups.dereference()["N"]` may be optimized out
+        self.sentinel_ = 1 # `self.groups.dereference()["sentinel_"]` may be optimized out
 
     def to_string(self):
-        size = BoostUnorderedHelpers.maybe_unwrap_atomic(self.val["table_"]["size_ctrl"]["size"])
+        size = BoostUnorderedHelpers.maybe_unwrap_atomic(self.table["size_ctrl"]["size"])
         return f"{self.name} with {size} elements"
 
     def display_hint(self):
@@ -191,30 +204,21 @@ class BoostUnorderedFoaPrinter:
         m = group["m"]
         at = lambda b: BoostUnorderedHelpers.maybe_unwrap_atomic(m[b]["n"])
 
-        N = group["N"]
-        sentinel_ = group["sentinel_"]
         if self.is_regular_layout(group):
-            return pos == N-1 and at(N-1) == sentinel_
+            return pos == self.N-1 and at(self.N-1) == self.sentinel_
         else:
-            return pos == N-1 and (at(0) & 0x4000400040004000) == 0x4000 and (at(1) & 0x4000400040004000) == 0
+            return pos == self.N-1 and (at(0) & 0x4000400040004000) == 0x4000 and (at(1) & 0x4000400040004000) == 0
 
     def children(self):
         def generator():
-            table = self.val["table_"]
+            pc_ = self.groups.cast(gdb.lookup_type("unsigned char").pointer())
-            groups = self.cpo.to_address(table["arrays"]["groups_"])
+            p_ = self.elements
-            elements = self.cpo.to_address(table["arrays"]["elements_"])
-
-            pc_ = groups.cast(gdb.lookup_type("unsigned char").pointer())
-            p_ = elements
             first_time = True
-            mask = 0
-            n0 = 0
-            n = 0
 
             count = 0
             while p_ != 0:
                 # This if block mirrors the condition in the begin() call
-                if (not first_time) or (self.match_occupied(groups.dereference()) & 1):
+                if (not first_time) or (self.match_occupied(self.groups.dereference()) & 1):
                     pointer = BoostUnorderedHelpers.maybe_unwrap_foa_element(p_)
                     value = self.cpo.to_address(pointer).dereference()
                     if self.is_map:
@@ -228,17 +232,17 @@ class BoostUnorderedFoaPrinter:
                     count += 1
                 first_time = False
 
-                n0 = pc_.cast(gdb.lookup_type("uintptr_t")) % groups.dereference().type.sizeof
+                n0 = pc_.cast(gdb.lookup_type("uintptr_t")) % self.groups.dereference().type.sizeof
                 pc_ = self.cpo.next(pc_, -n0)
 
-                mask = (self.match_occupied(pc_.cast(groups.type).dereference()) >> (n0+1)) << (n0+1)
+                mask = (self.match_occupied(pc_.cast(self.groups.type).dereference()) >> (n0+1)) << (n0+1)
                 while mask == 0:
-                    pc_ = self.cpo.next(pc_, groups.dereference().type.sizeof)
+                    pc_ = self.cpo.next(pc_, self.groups.dereference().type.sizeof)
-                    p_ = self.cpo.next(p_, groups.dereference()["N"])
+                    p_ = self.cpo.next(p_, self.N)
-                    mask = self.match_occupied(pc_.cast(groups.type).dereference())
+                    mask = self.match_occupied(pc_.cast(self.groups.type).dereference())
 
                 n = BoostUnorderedHelpers.countr_zero(mask)
-                if self.is_sentinel(pc_.cast(groups.type).dereference(), n):
+                if self.is_sentinel(pc_.cast(self.groups.type).dereference(), n):
                     p_ = 0
                 else:
                     pc_ = self.cpo.next(pc_, n)

include/boost/unordered/concurrent_flat_map.hpp

@@ -1,7 +1,8 @@
 /* Fast open-addressing concurrent hashmap.
  *
  * Copyright 2023 Christian Mazakas.
- * Copyright 2023-2024 Joaquin M Lopez Munoz.
+ * Copyright 2023-2026 Joaquin M Lopez Munoz.
+ * Copyright 2026 Braden Ganetsky
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or copy at
  * http://www.boost.org/LICENSE_1_0.txt)
@@ -16,6 +17,7 @@
 #include <boost/unordered/detail/concurrent_static_asserts.hpp>
 #include <boost/unordered/detail/foa/concurrent_table.hpp>
 #include <boost/unordered/detail/foa/flat_map_types.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_flat_map_fwd.hpp>
 
@@ -101,6 +103,21 @@ namespace boost {
         this->insert(f, l);
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_map(FromRangeT&&, R&& rg,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+#endif
+
       concurrent_flat_map(concurrent_flat_map const& rhs)
           : table_(rhs.table_,
               boost::allocator_select_on_container_copy_construction(
@@ -120,6 +137,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_map(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : concurrent_flat_map(
+            fr, std::forward<R>(rg), 0, hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit concurrent_flat_map(allocator_type const& a)
           : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
       {
@@ -170,6 +200,29 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_map(
+        FromRangeT&& fr, R&& rg, size_type n, const allocator_type& a)
+          : concurrent_flat_map(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_map(FromRangeT&& fr, R&& rg, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_map(fr, std::forward<R>(rg), n, hf, key_equal(), a)
+      {
+      }
+#endif
+
       concurrent_flat_map(
         std::initializer_list<value_type> il, const allocator_type& a)
           : concurrent_flat_map(
@@ -189,10 +242,10 @@ namespace boost {
       {
       }
 
-
+      template <typename Key2,
-      template <bool avoid_explicit_instantiation = true>
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       concurrent_flat_map(
-        unordered_flat_map<Key, T, Hash, Pred, Allocator>&& other)
+        unordered_flat_map<Key2, T, Hash, Pred, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -423,12 +476,26 @@ namespace boost {
       size_type insert(InputIterator begin, InputIterator end)
       {
         size_type count_elements = 0;
-        for (auto pos = begin; pos != end; ++pos, ++count_elements) {
+        for (auto pos = begin; pos != end; ++pos) {
-          table_.emplace(*pos);
+          if (table_.emplace(*pos)) ++count_elements;
         }
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      size_type insert_range(R&& rg)
+      {
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) {
+          if (table_.emplace(*first++)) ++count_elements;
+        }
+        return count_elements;
+      }
+#endif
+
       size_type insert(std::initializer_list<value_type> ilist)
       {
         return this->insert(ilist.begin(), ilist.end());
@@ -484,6 +551,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_visit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_visit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_visit(std::initializer_list<value_type> ilist, F f)
       {
@@ -517,6 +599,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_cvisit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
       {
@@ -554,6 +651,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_visit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_visit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -594,6 +709,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_cvisit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_cvisit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -979,6 +1112,27 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
+
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -1026,6 +1180,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> concurrent_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(FromRangeT&&, R&&, Allocator)
+      -> concurrent_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> concurrent_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     concurrent_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,

include/boost/unordered/concurrent_flat_set.hpp

@@ -1,7 +1,8 @@
 /* Fast open-addressing concurrent hashset.
  *
  * Copyright 2023 Christian Mazakas.
- * Copyright 2023-2024 Joaquin M Lopez Munoz.
+ * Copyright 2023-2026 Joaquin M Lopez Munoz.
+ * Copyright 2026 Braden Ganetsky
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or copy at
  * http://www.boost.org/LICENSE_1_0.txt)
@@ -16,6 +17,7 @@
 #include <boost/unordered/detail/concurrent_static_asserts.hpp>
 #include <boost/unordered/detail/foa/concurrent_table.hpp>
 #include <boost/unordered/detail/foa/flat_set_types.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_flat_set_fwd.hpp>
 
@@ -98,6 +100,21 @@ namespace boost {
         this->insert(f, l);
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_set(FromRangeT&&, R&& rg,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+#endif
+
       concurrent_flat_set(concurrent_flat_set const& rhs)
           : table_(rhs.table_,
               boost::allocator_select_on_container_copy_construction(
@@ -117,6 +134,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_set(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : concurrent_flat_set(
+            fr, std::forward<R>(rg), 0, hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit concurrent_flat_set(allocator_type const& a)
           : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
       {
@@ -167,6 +197,29 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_set(
+        FromRangeT&& fr, R&& rg, size_type n, const allocator_type& a)
+          : concurrent_flat_set(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_flat_set(FromRangeT&& fr, R&& rg, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_set(fr, std::forward<R>(rg), n, hf, key_equal(), a)
+      {
+      }
+#endif
+
       concurrent_flat_set(
         std::initializer_list<value_type> il, const allocator_type& a)
           : concurrent_flat_set(
@@ -186,10 +239,10 @@ namespace boost {
       {
       }
 
-
+      template <typename Key2,
-      template <bool avoid_explicit_instantiation = true>
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       concurrent_flat_set(
-        unordered_flat_set<Key, Hash, Pred, Allocator>&& other)
+        unordered_flat_set<Key2, Hash, Pred, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -429,12 +482,26 @@ namespace boost {
       size_type insert(InputIterator begin, InputIterator end)
       {
         size_type count_elements = 0;
-        for (auto pos = begin; pos != end; ++pos, ++count_elements) {
+        for (auto pos = begin; pos != end; ++pos) {
-          table_.emplace(*pos);
+          if (table_.emplace(*pos)) ++count_elements;
         }
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      size_type insert_range(R&& rg)
+      {
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) {
+          if (table_.emplace(*first++)) ++count_elements;
+        }
+        return count_elements;
+      }
+#endif
+
       size_type insert(std::initializer_list<value_type> ilist)
       {
         return this->insert(ilist.begin(), ilist.end());
@@ -475,6 +542,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_visit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_visit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_visit(std::initializer_list<value_type> ilist, F f)
       {
@@ -517,6 +599,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_cvisit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
       {
@@ -565,6 +662,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_visit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_visit(std::initializer_list<value_type> ilist, F1 f1, F2 f2)
       {
@@ -615,6 +730,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_cvisit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_cvisit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -852,6 +985,25 @@ namespace boost {
         typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -893,6 +1045,39 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(FromRangeT&&, R&&, Allocator)
+      -> concurrent_flat_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     concurrent_flat_set(std::initializer_list<T>, std::size_t, Allocator)

include/boost/unordered/concurrent_node_map.hpp

@@ -1,7 +1,8 @@
 /* Fast open-addressing, node-based concurrent hashmap.
  *
  * Copyright 2023 Christian Mazakas.
- * Copyright 2023-2024 Joaquin M Lopez Munoz.
+ * Copyright 2023-2026 Joaquin M Lopez Munoz.
+ * Copyright 2026 Braden Ganetsky
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or copy at
  * http://www.boost.org/LICENSE_1_0.txt)
@@ -18,6 +19,7 @@
 #include <boost/unordered/detail/foa/element_type.hpp>
 #include <boost/unordered/detail/foa/node_map_handle.hpp>
 #include <boost/unordered/detail/foa/node_map_types.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_node_map_fwd.hpp>
 
@@ -109,6 +111,21 @@ namespace boost {
         this->insert(f, l);
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_map(FromRangeT&&, R&& rg,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+#endif
+
       concurrent_node_map(concurrent_node_map const& rhs)
           : table_(rhs.table_,
               boost::allocator_select_on_container_copy_construction(
@@ -128,6 +145,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_map(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : concurrent_node_map(
+            fr, std::forward<R>(rg), 0, hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit concurrent_node_map(allocator_type const& a)
           : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
       {
@@ -178,6 +208,29 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_map(
+        FromRangeT&& fr, R&& rg, size_type n, const allocator_type& a)
+          : concurrent_node_map(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_map(FromRangeT&& fr, R&& rg, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_node_map(fr, std::forward<R>(rg), n, hf, key_equal(), a)
+      {
+      }
+#endif
+
       concurrent_node_map(
         std::initializer_list<value_type> il, const allocator_type& a)
           : concurrent_node_map(
@@ -197,9 +250,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       concurrent_node_map(
-        unordered_node_map<Key, T, Hash, Pred, Allocator>&& other)
+        unordered_node_map<Key2, T, Hash, Pred, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -430,12 +484,26 @@ namespace boost {
       size_type insert(InputIterator begin, InputIterator end)
       {
         size_type count_elements = 0;
-        for (auto pos = begin; pos != end; ++pos, ++count_elements) {
+        for (auto pos = begin; pos != end; ++pos) {
-          table_.emplace(*pos);
+          if (table_.emplace(*pos)) ++count_elements;
         }
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      size_type insert_range(R&& rg)
+      {
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) {
+          if (table_.emplace(*first++)) ++count_elements;
+        }
+        return count_elements;
+      }
+#endif
+
       size_type insert(std::initializer_list<value_type> ilist)
       {
         return this->insert(ilist.begin(), ilist.end());
@@ -510,6 +578,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_visit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_visit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_visit(std::initializer_list<value_type> ilist, F f)
       {
@@ -564,6 +647,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_cvisit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
       {
@@ -622,6 +720,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_visit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_visit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -684,6 +800,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_cvisit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_cvisit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -1126,6 +1260,27 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_map(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
+
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -1173,6 +1328,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_map(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> concurrent_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_map(FromRangeT&&, R&&, Allocator)
+      -> concurrent_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_map(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> concurrent_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     concurrent_node_map(std::initializer_list<std::pair<Key, T> >, std::size_t,

include/boost/unordered/concurrent_node_set.hpp

@@ -1,7 +1,8 @@
 /* Fast open-addressing, node-based concurrent hashset.
  *
  * Copyright 2023 Christian Mazakas.
- * Copyright 2023-2024 Joaquin M Lopez Munoz.
+ * Copyright 2023-2026 Joaquin M Lopez Munoz.
+ * Copyright 2026 Braden Ganetsky
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or copy at
  * http://www.boost.org/LICENSE_1_0.txt)
@@ -18,6 +19,7 @@
 #include <boost/unordered/detail/foa/element_type.hpp>
 #include <boost/unordered/detail/foa/node_set_handle.hpp>
 #include <boost/unordered/detail/foa/node_set_types.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_node_set_fwd.hpp>
 
@@ -106,6 +108,21 @@ namespace boost {
         this->insert(f, l);
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_set(FromRangeT&&, R&& rg,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+#endif
+
       concurrent_node_set(concurrent_node_set const& rhs)
           : table_(rhs.table_,
               boost::allocator_select_on_container_copy_construction(
@@ -125,6 +142,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_set(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : concurrent_node_set(
+            fr, std::forward<R>(rg), 0, hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit concurrent_node_set(allocator_type const& a)
           : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
       {
@@ -175,6 +205,29 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_set(
+        FromRangeT&& fr, R&& rg, size_type n, const allocator_type& a)
+          : concurrent_node_set(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      concurrent_node_set(FromRangeT&& fr, R&& rg, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_node_set(fr, std::forward<R>(rg), n, hf, key_equal(), a)
+      {
+      }
+#endif
+
       concurrent_node_set(
         std::initializer_list<value_type> il, const allocator_type& a)
           : concurrent_node_set(
@@ -194,9 +247,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       concurrent_node_set(
-        unordered_node_set<Key, Hash, Pred, Allocator>&& other)
+        unordered_node_set<Key2, Hash, Pred, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -436,12 +490,26 @@ namespace boost {
       size_type insert(InputIterator begin, InputIterator end)
       {
         size_type count_elements = 0;
-        for (auto pos = begin; pos != end; ++pos, ++count_elements) {
+        for (auto pos = begin; pos != end; ++pos) {
-          table_.emplace(*pos);
+          if (table_.emplace(*pos)) ++count_elements;
         }
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      size_type insert_range(R&& rg)
+      {
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) {
+          if (table_.emplace(*first++)) ++count_elements;
+        }
+        return count_elements;
+      }
+#endif
+
       size_type insert(std::initializer_list<value_type> ilist)
       {
         return this->insert(ilist.begin(), ilist.end());
@@ -501,6 +569,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_visit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_visit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_visit(std::initializer_list<value_type> ilist, F f)
       {
@@ -564,6 +647,21 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R, class F>
+      size_type insert_range_or_cvisit(R&& rg, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F>
       size_type insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
       {
@@ -633,6 +731,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_visit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_visit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_visit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -706,6 +822,24 @@ namespace boost {
         return count_elements;
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::container_compatible_range<value_type> R, class F1, class F2
+      >
+      size_type insert_range_and_cvisit(R&& rg, F1 f1, F2 f2)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F1)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F2)
+        size_type count_elements = 0;
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        for (; first != last; ++first, ++count_elements) {
+          table_.emplace_and_cvisit(*first, f1, f2);
+        }
+        return count_elements;
+      }
+#endif
+
       template <class F1, class F2>
       size_type insert_and_cvisit(
         std::initializer_list<value_type> ilist, F1 f1, F2 f2)
@@ -1000,6 +1134,26 @@ namespace boost {
         typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_set(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -1041,6 +1195,39 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_set(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_set(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_node_set(FromRangeT&&, R&&, Allocator)
+      -> concurrent_node_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     concurrent_node_set(std::initializer_list<T>, std::size_t, Allocator)

include/boost/unordered/detail/fca.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2022-2024 Joaquin M Lopez Munoz.
+// Copyright (C) 2022-2025 Joaquin M Lopez Munoz.
 // Copyright (C) 2022 Christian Mazakas
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -134,11 +134,37 @@ namespace boost {
   namespace unordered {
     namespace detail {
 
+      template <class ValueType, class VoidPtr> struct node;
+
+      // access to node::value_type and node::pointer for incomplete node
+
+      template<class Node> struct node_value_type_impl;
+
+      template <class ValueType, class VoidPtr>
+      struct node_value_type_impl<node<ValueType, VoidPtr>>
+      {
+        typedef ValueType type;
+      };
+
+      template<class Node> using node_value_type = 
+        typename node_value_type_impl<Node>::type;
+
+      template<class Node> struct node_pointer_impl;
+
+      template <class ValueType, class VoidPtr>
+      struct node_pointer_impl<node<ValueType, VoidPtr>>
+      {
+        typedef typename boost::pointer_traits<VoidPtr>::template rebind_to<
+          node<ValueType, VoidPtr>>::type type;
+      };
+
+      template<class Node> using node_pointer = 
+        typename node_pointer_impl<Node>::type;
+
       template <class ValueType, class VoidPtr> struct node
       {
-        typedef ValueType value_type;
+        typedef node_value_type<node> value_type;
-        typedef typename boost::pointer_traits<VoidPtr>::template rebind_to<
+        typedef detail::node_pointer<node> node_pointer;
-          node>::type node_pointer;
 
         node_pointer next;
         opt_storage<value_type> buf;
@@ -304,10 +330,10 @@ namespace boost {
 
       template <class Node> struct grouped_local_bucket_iterator
       {
-        typedef typename Node::node_pointer node_pointer;
+        typedef detail::node_pointer<Node> node_pointer;
 
       public:
-        typedef typename Node::value_type value_type;
+        typedef detail::node_value_type<Node> value_type;
         typedef value_type element_type;
         typedef value_type* pointer;
         typedef value_type& reference;
@@ -370,10 +396,10 @@ namespace boost {
 
       template <class Node> struct const_grouped_local_bucket_iterator
       {
-        typedef typename Node::node_pointer node_pointer;
+        typedef detail::node_pointer<Node> node_pointer;
 
       public:
-        typedef typename Node::value_type const value_type;
+        typedef detail::node_value_type<Node> const value_type;
         typedef value_type const element_type;
         typedef value_type const* pointer;
         typedef value_type const& reference;

include/boost/unordered/detail/foa/concurrent_table.hpp

@@ -1,6 +1,6 @@
 /* Fast open-addressing concurrent hash table.
  *
- * Copyright 2023-2024 Joaquin M Lopez Munoz.
+ * Copyright 2023-2026 Joaquin M Lopez Munoz.
  * Copyright 2024 Braden Ganetsky.
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or copy at
@@ -697,9 +697,9 @@ public:
   }
 
   /* Optimizations for maps for (k,v) to avoid eagerly constructing value */
-  template <typename K, typename V>
+  template <typename K, typename V, typename Table = concurrent_table>
   BOOST_FORCEINLINE auto emplace(K&& k, V&& v) ->
-    typename std::enable_if<is_emplace_kv_able<concurrent_table, K>::value,
+    typename std::enable_if<is_emplace_kv_able<Table, K>::value,
       bool>::type
   {
     alloc_cted_or_fwded_key_type<type_policy, Allocator, K&&> x(

include/boost/unordered/detail/foa/core.hpp

@@ -1,6 +1,6 @@
 /* Common base for Boost.Unordered open-addressing tables.
  *
- * Copyright 2022-2025 Joaquin M Lopez Munoz.
+ * Copyright 2022-2026 Joaquin M Lopez Munoz.
  * Copyright 2023 Christian Mazakas.
  * Copyright 2024 Braden Ganetsky.
  * Distributed under the Boost Software License, Version 1.0.
@@ -29,7 +29,7 @@
 #include <boost/unordered/detail/mulx.hpp>
 #include <boost/unordered/detail/static_assert.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
-#include <boost/unordered/unordered_printers.hpp>
+#include <boost/unordered/detail/unordered_printers.hpp>
 #include <climits>
 #include <cmath>
 #include <cstddef>
@@ -923,6 +923,8 @@ inline unsigned int unchecked_countr_zero(int x)
   unsigned long r;
   _BitScanForward(&r,(unsigned long)x);
   return (unsigned int)r;
+#elif defined(BOOST_GCC)||defined(BOOST_CLANG)
+  return (unsigned int)__builtin_ctz((unsigned int)x);
 #else
   BOOST_UNORDERED_ASSUME(x!=0);
   return (unsigned int)boost::core::countr_zero((unsigned int)x);
@@ -1347,7 +1349,7 @@ template <typename Container, typename K>
 using is_emplace_kv_able = std::integral_constant<bool,
   is_map<Container>::value &&
     (is_similar<K, typename Container::key_type>::value ||
-      is_complete_and_move_constructible<typename Container::key_type>::value)>;
+      std::is_move_constructible<typename Container::key_type>::value)>;
 
 /* table_core. The TypePolicy template parameter is used to generate
  * instantiations suitable for either maps or sets, and introduces non-standard

include/boost/unordered/detail/foa/table.hpp

@@ -1,6 +1,6 @@
 /* Fast open-addressing hash table.
  *
- * Copyright 2022-2025 Joaquin M Lopez Munoz.
+ * Copyright 2022-2026 Joaquin M Lopez Munoz.
  * Copyright 2023 Christian Mazakas.
  * Copyright 2024 Braden Ganetsky.
  * Distributed under the Boost Software License, Version 1.0.
@@ -422,9 +422,9 @@ public:
   }
 
   /* Optimizations for maps for (k,v) to avoid eagerly constructing value */
-  template <typename K, typename V>
+  template <typename K, typename V, typename Table = table>
   BOOST_FORCEINLINE
-    typename std::enable_if<is_emplace_kv_able<table, K>::value,
+    typename std::enable_if<is_emplace_kv_able<Table, K>::value,
       std::pair<iterator, bool> >::type
     emplace(K&& k, V&& v)
   {

include/boost/unordered/detail/implementation.hpp

@@ -1,6 +1,6 @@
 // Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
 // Copyright (C) 2005-2016 Daniel James
-// Copyright (C) 2022-2024 Joaquin M Lopez Munoz.
+// Copyright (C) 2022-2026 Joaquin M Lopez Munoz.
 // Copyright (C) 2022-2023 Christian Mazakas
 // Copyright (C) 2024 Braden Ganetsky
 //
@@ -18,12 +18,14 @@
 #include <boost/unordered/detail/allocator_constructed.hpp>
 #include <boost/unordered/detail/fca.hpp>
 #include <boost/unordered/detail/opt_storage.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_tracked_address.hpp>
 #include <boost/unordered/detail/static_assert.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
-#include <boost/unordered/unordered_printers.hpp>
+#include <boost/unordered/detail/unordered_printers.hpp>
 
 #include <boost/assert.hpp>
+#include <boost/config/workaround.hpp>
 #include <boost/core/allocator_traits.hpp>
 #include <boost/core/bit.hpp>
 #include <boost/core/invoke_swap.hpp>
@@ -174,6 +176,29 @@ namespace boost {
           boost::unordered::detail::insert_size(i, j), num_buckets);
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<std::ranges::input_range R>
+      inline std::size_t insert_size(R&& rg)
+      {
+        if constexpr (std::ranges::sized_range<R>)
+          return std::ranges::size(std::forward<R>(rg));
+        else if constexpr (std::ranges::forward_range<R>)
+          return std::ranges::distance(std::forward<R>(rg));
+        else
+          return 1;
+      }
+
+      template <std::ranges::input_range R>
+      inline std::size_t initial_size(R&& rg,
+        std::size_t num_buckets =
+          boost::unordered::detail::default_bucket_count)
+      {
+        return (std::max)(
+          boost::unordered::detail::insert_size(std::forward<R>(rg)),
+          num_buckets);
+      }
+#endif
+
       //////////////////////////////////////////////////////////////////////////
       // compressed
 
@@ -954,10 +979,14 @@ namespace boost {
 
       inline std::size_t double_to_size(double f)
       {
-        return f >= static_cast<double>(
+#if BOOST_WORKAROUND(BOOST_CLANG_VERSION, < 30900)
-                      (std::numeric_limits<std::size_t>::max)())
+        // https://github.com/boostorg/unordered/pull/354
-                 ? (std::numeric_limits<std::size_t>::max)()
+        volatile
-                 : static_cast<std::size_t>(f);
+#endif
+        const double double_size_t_max =
+          static_cast<double>((std::numeric_limits<std::size_t>::max)());
+        return f >= double_size_t_max? 
+          (std::numeric_limits<std::size_t>::max)(): static_cast<std::size_t>(f);
       }
 
       //////////////////////////////////////////////////////////////////////////
@@ -969,7 +998,7 @@ namespace boost {
         template <class Node, class Bucket> class iterator
         {
         public:
-          typedef typename Node::value_type value_type;
+          typedef typename detail::node_value_type<Node> value_type;
           typedef value_type element_type;
           typedef value_type* pointer;
           typedef value_type& reference;
@@ -1023,7 +1052,7 @@ namespace boost {
           }
 
         private:
-          typedef typename Node::node_pointer node_pointer;
+          typedef detail::node_pointer<Node> node_pointer;
           typedef grouped_bucket_iterator<Bucket> bucket_iterator;
 
           node_pointer p;
@@ -1076,7 +1105,7 @@ namespace boost {
         template <class Node, class Bucket> class c_iterator
         {
         public:
-          typedef typename Node::value_type value_type;
+          typedef typename detail::node_value_type<Node> value_type;
           typedef value_type const element_type;
           typedef value_type const* pointer;
           typedef value_type const& reference;
@@ -1131,7 +1160,7 @@ namespace boost {
           }
 
         private:
-          typedef typename Node::node_pointer node_pointer;
+          typedef detail::node_pointer<Node> node_pointer;
           typedef grouped_bucket_iterator<Bucket> bucket_iterator;
 
           node_pointer p;
@@ -1781,7 +1810,7 @@ namespace boost {
 
         static std::size_t min_buckets(std::size_t num_elements, float mlf)
         {
-          std::size_t num_buckets = static_cast<std::size_t>(
+          std::size_t num_buckets = boost::unordered::detail::double_to_size(
             std::ceil(static_cast<float>(num_elements) / mlf));
 
           if (num_buckets == 0 && num_elements > 0) { // mlf == inf
@@ -2150,8 +2179,8 @@ namespace boost {
         // if hash function throws, or inserting > 1 element, basic exception
         // safety strong otherwise
 
-        template <class InputIt>
+        template <class InputIt, class Sentinel>
-        void insert_range_unique(no_key, InputIt i, InputIt j)
+        void insert_range_unique(no_key, InputIt i, Sentinel j)
         {
           hasher const& hf = this->hash_function();
           node_allocator_type alloc = this->node_alloc();
@@ -2538,14 +2567,20 @@ namespace boost {
 
         // if hash function throws, or inserting > 1 element, basic exception
         // safety. Strong otherwise
-        template <class I>
+        template <class I, class S>
         typename boost::unordered::detail::enable_if_forward<I, void>::type
-        insert_range_equiv(I i, I j)
+        insert_range_equiv(I i, S j)
         {
           if (i == j)
             return;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+          std::size_t distance = static_cast<std::size_t>(
+            std::ranges::distance(i, j));
+#else
           std::size_t distance = static_cast<std::size_t>(std::distance(i, j));
+#endif
+
           if (distance == 1) {
             emplace_equiv(boost::unordered::detail::func::construct_node(
               this->node_alloc(), *i));
@@ -2561,9 +2596,9 @@ namespace boost {
           }
         }
 
-        template <class I>
+        template <class I, class S>
         typename boost::unordered::detail::disable_if_forward<I, void>::type
-        insert_range_equiv(I i, I j)
+        insert_range_equiv(I i, S j)
         {
           for (; i != j; ++i) {
             emplace_equiv(boost::unordered::detail::func::construct_node(
@@ -2712,8 +2747,9 @@ namespace boost {
       inline void table<Types>::reserve_for_insert(std::size_t num_elements)
       {
         if (num_elements > max_load_) {
-          std::size_t const num_buckets = static_cast<std::size_t>(
+          std::size_t const num_buckets = (std::max)(
-            1.0f + std::ceil(static_cast<float>(num_elements) / mlf_));
+            static_cast<std::size_t>(1.0f + std::ceil(static_cast<float>(num_elements) / mlf_)),
+            static_cast<std::size_t>(bucket_count() + 1));
 
           this->rehash_impl(num_buckets);
         }
@@ -2851,10 +2887,10 @@ namespace boost {
           return no_key();
         }
 
-        template <class Arg1, class Arg2>
+        template <class Arg1, class Arg2, class Key = key_type>
         static typename std::conditional<
           (is_similar<Arg1, key_type>::value ||
-            is_complete_and_move_constructible<key_type>::value),
+            std::is_move_constructible<Key>::value),
           converting_key, no_key>::type
         extract(Arg1 const&, Arg2 const&)
         {

include/boost/unordered/detail/ranges_support.hpp

@@ -0,0 +1,104 @@
+/* Copyright 2026 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_RANGES_SUPPORT_HPP
+#define BOOST_UNORDERED_DETAIL_RANGES_SUPPORT_HPP
+
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+#if defined(BOOST_NO_CXX20_HDR_CONCEPTS) || defined(BOOST_NO_CXX20_HDR_RANGES)
+#define BOOST_UNORDERED_NO_RANGES
+#elif BOOST_WORKAROUND(BOOST_CLANG_VERSION, < 170100) && \
+      defined(BOOST_LIBSTDCXX_VERSION)
+/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109647
+ * https://github.com/llvm/llvm-project/issues/49620
+ */
+#define BOOST_UNORDERED_NO_RANGES
+#endif
+
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+#include <concepts>
+#include <functional>
+#include <ranges>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+namespace boost {
+namespace unordered {
+
+struct from_range_t { explicit from_range_t() = default; };
+inline constexpr from_range_t from_range{};
+
+namespace detail {
+
+/* Existence of std::from_range_t is governed by feature macro
+ * __cpp_lib_containers_ranges, but at least one stdlib implementation 
+ * (GCC 14.1) does not honor it, hence the workadound below: code picks 
+ * std::from_range_t if it exists, boost::unordered::from_range_t otherwise.
+ * Technique explained at
+ https://bannalia.blogspot.com/2016/09/compile-time-checking-existence-of.html
+ */
+
+struct from_range_t_hook{};
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+namespace std {
+
+template<> struct hash< ::boost::unordered::detail::from_range_t_hook>
+{
+  using from_range_t_type = decltype([] {
+    using namespace ::boost::unordered;
+    return from_range_t{};
+  }());
+
+  /* make standard happy */
+  std::size_t operator()(
+    const ::boost::unordered::detail::from_range_t_hook&) const;
+};
+
+} /* namespace std */
+
+namespace boost {
+namespace unordered {
+namespace detail {
+
+template<typename T>
+concept convertible_to_from_range_t =
+  std::is_convertible_v<T, boost::unordered::from_range_t> ||
+  std::is_convertible_v<T, std::hash<from_range_t_hook>::from_range_t_type>;
+
+template<class R, class T>
+concept container_compatible_range =
+  std::ranges::input_range<R> &&
+  std::convertible_to<std::ranges::range_reference_t<R>, T>;
+
+template<std::ranges::input_range Range>
+using range_key_t =
+  std::remove_cvref_t<
+    std::tuple_element_t<0, std::ranges::range_value_t<Range>>>;
+
+template<std::ranges::input_range Range>
+using range_mapped_t =
+  std::remove_cvref_t<
+    std::tuple_element_t<1, std::ranges::range_value_t<Range>>>;
+
+template<std::ranges::input_range Range>
+using range_to_alloc_t = 
+  std::pair<const range_key_t<Range>, range_mapped_t<Range>>;
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif /* !defined(BOOST_UNORDERED_NO_RANGES) */
+#endif

include/boost/unordered/detail/type_traits.hpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2022-2023 Christian Mazakas
 // Copyright (C) 2024 Braden Ganetsky
+// Copyright (C) 2026 Joaquin M Lopez Munoz
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -49,20 +50,6 @@ namespace boost {
 
       template <typename... Ts> using void_t = typename make_void<Ts...>::type;
 
-      template <class T, class = void> struct is_complete : std::false_type
-      {
-      };
-
-      template <class T>
-      struct is_complete<T, void_t<int[sizeof(T)]> > : std::true_type
-      {
-      };
-
-      template <class T>
-      using is_complete_and_move_constructible =
-        typename std::conditional<is_complete<T>::value,
-          std::is_move_constructible<T>, std::false_type>::type;
-
 #if BOOST_WORKAROUND(BOOST_LIBSTDCXX_VERSION, < 50000)
       /* std::is_trivially_default_constructible not provided */
       template <class T>

include/boost/unordered/detail/unordered_printers.hpp

@@ -1,11 +1,11 @@
-// Copyright 2024 Braden Ganetsky
+// Copyright 2024-2026 Braden Ganetsky
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
-// Generated on 2024-08-25T17:48:54
+// Generated on 2026-01-24T00:34:53
 
-#ifndef BOOST_UNORDERED_UNORDERED_PRINTERS_HPP
+#ifndef BOOST_UNORDERED_DETAIL_UNORDERED_PRINTERS_HPP
-#define BOOST_UNORDERED_UNORDERED_PRINTERS_HPP
+#define BOOST_UNORDERED_DETAIL_UNORDERED_PRINTERS_HPP
 
 #ifndef BOOST_ALL_NO_EMBEDDED_GDB_SCRIPTS
 #if defined(__ELF__)
@@ -14,7 +14,7 @@
 #pragma clang diagnostic ignored "-Woverlength-strings"
 #endif
 __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
-        ".ascii \"\\4gdb.inlined-script.BOOST_UNORDERED_UNORDERED_PRINTERS_HPP\\n\"\n"
+        ".ascii \"\\4gdb.inlined-script.BOOST_UNORDERED_DETAIL_UNORDERED_PRINTERS_HPP\\n\"\n"
         ".ascii \"import gdb.printing\\n\"\n"
         ".ascii \"import gdb.xmethod\\n\"\n"
         ".ascii \"import re\\n\"\n"
@@ -29,8 +29,14 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
         ".ascii \"            return n\\n\"\n"
 
         ".ascii \"    def maybe_unwrap_foa_element(e):\\n\"\n"
-        ".ascii \"        if f\\\"{e.type.strip_typedefs()}\\\".startswith(\\\"boost::unordered::detail::foa::element_type<\\\"):\\n\"\n"
+        ".ascii \"        # Sometimes the complex typedefs can't be resolved through a pointer\\n\"\n"
-        ".ascii \"            return e[\\\"p\\\"]\\n\"\n"
+        ".ascii \"        if e.type.strip_typedefs().code == gdb.TYPE_CODE_PTR:\\n\"\n"
+        ".ascii \"            foa_element = e.dereference()\\n\"\n"
+        ".ascii \"        else:\\n\"\n"
+        ".ascii \"            foa_element = e\\n\"\n"
+
+        ".ascii \"        if f\\\"{foa_element.type.strip_typedefs()}\\\".startswith(\\\"boost::unordered::detail::foa::element_type<\\\"):\\n\"\n"
+        ".ascii \"            return foa_element[\\\"p\\\"]\\n\"\n"
         ".ascii \"        else:\\n\"\n"
         ".ascii \"            return e\\n\"\n"
 
@@ -58,14 +64,15 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
 
         ".ascii \"class BoostUnorderedFcaPrinter:\\n\"\n"
         ".ascii \"    def __init__(self, val):\\n\"\n"
-        ".ascii \"        self.val = BoostUnorderedHelpers.maybe_unwrap_reference(val)\\n\"\n"
+        ".ascii \"        val = BoostUnorderedHelpers.maybe_unwrap_reference(val)\\n\"\n"
-        ".ascii \"        self.name = f\\\"{self.val.type.strip_typedefs()}\\\".split(\\\"<\\\")[0]\\n\"\n"
+        ".ascii \"        self.table = val[\\\"table_\\\"]\\n\"\n"
+        ".ascii \"        self.name = f\\\"{val.type.strip_typedefs()}\\\".split(\\\"<\\\")[0]\\n\"\n"
         ".ascii \"        self.name = self.name.replace(\\\"boost::unordered::\\\", \\\"boost::\\\")\\n\"\n"
         ".ascii \"        self.is_map = self.name.endswith(\\\"map\\\")\\n\"\n"
-        ".ascii \"        self.cpo = BoostUnorderedPointerCustomizationPoint(self.val[\\\"table_\\\"][\\\"buckets_\\\"][\\\"buckets\\\"])\\n\"\n"
+        ".ascii \"        self.cpo = BoostUnorderedPointerCustomizationPoint(self.table[\\\"buckets_\\\"][\\\"buckets\\\"])\\n\"\n"
 
         ".ascii \"    def to_string(self):\\n\"\n"
-        ".ascii \"        size = self.val[\\\"table_\\\"][\\\"size_\\\"]\\n\"\n"
+        ".ascii \"        size = self.table[\\\"size_\\\"]\\n\"\n"
         ".ascii \"        return f\\\"{self.name} with {size} elements\\\"\\n\"\n"
 
         ".ascii \"    def display_hint(self):\\n\"\n"
@@ -73,7 +80,7 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
 
         ".ascii \"    def children(self):\\n\"\n"
         ".ascii \"        def generator():\\n\"\n"
-        ".ascii \"            grouped_buckets = self.val[\\\"table_\\\"][\\\"buckets_\\\"]\\n\"\n"
+        ".ascii \"            grouped_buckets = self.table[\\\"buckets_\\\"]\\n\"\n"
 
         ".ascii \"            size = grouped_buckets[\\\"size_\\\"]\\n\"\n"
         ".ascii \"            buckets = grouped_buckets[\\\"buckets\\\"]\\n\"\n"
@@ -167,14 +174,20 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
 
         ".ascii \"class BoostUnorderedFoaPrinter:\\n\"\n"
         ".ascii \"    def __init__(self, val):\\n\"\n"
-        ".ascii \"        self.val = BoostUnorderedHelpers.maybe_unwrap_reference(val)\\n\"\n"
+        ".ascii \"        val = BoostUnorderedHelpers.maybe_unwrap_reference(val)\\n\"\n"
-        ".ascii \"        self.name = f\\\"{self.val.type.strip_typedefs()}\\\".split(\\\"<\\\")[0]\\n\"\n"
+        ".ascii \"        self.table = val[\\\"table_\\\"]\\n\"\n"
+        ".ascii \"        self.name = f\\\"{val.type.strip_typedefs()}\\\".split(\\\"<\\\")[0]\\n\"\n"
         ".ascii \"        self.name = self.name.replace(\\\"boost::unordered::\\\", \\\"boost::\\\")\\n\"\n"
         ".ascii \"        self.is_map = self.name.endswith(\\\"map\\\")\\n\"\n"
-        ".ascii \"        self.cpo = BoostUnorderedPointerCustomizationPoint(self.val[\\\"table_\\\"][\\\"arrays\\\"][\\\"groups_\\\"])\\n\"\n"
+        ".ascii \"        self.cpo = BoostUnorderedPointerCustomizationPoint(self.table[\\\"arrays\\\"][\\\"groups_\\\"])\\n\"\n"
+        ".ascii \"        self.groups = self.cpo.to_address(self.table[\\\"arrays\\\"][\\\"groups_\\\"])\\n\"\n"
+        ".ascii \"        self.elements = self.cpo.to_address(self.table[\\\"arrays\\\"][\\\"elements_\\\"])\\n\"\n"
+
+        ".ascii \"        self.N = 15 # `self.groups.dereference()[\\\"N\\\"]` may be optimized out\\n\"\n"
+        ".ascii \"        self.sentinel_ = 1 # `self.groups.dereference()[\\\"sentinel_\\\"]` may be optimized out\\n\"\n"
 
         ".ascii \"    def to_string(self):\\n\"\n"
-        ".ascii \"        size = BoostUnorderedHelpers.maybe_unwrap_atomic(self.val[\\\"table_\\\"][\\\"size_ctrl\\\"][\\\"size\\\"])\\n\"\n"
+        ".ascii \"        size = BoostUnorderedHelpers.maybe_unwrap_atomic(self.table[\\\"size_ctrl\\\"][\\\"size\\\"])\\n\"\n"
         ".ascii \"        return f\\\"{self.name} with {size} elements\\\"\\n\"\n"
 
         ".ascii \"    def display_hint(self):\\n\"\n"
@@ -204,30 +217,21 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
         ".ascii \"        m = group[\\\"m\\\"]\\n\"\n"
         ".ascii \"        at = lambda b: BoostUnorderedHelpers.maybe_unwrap_atomic(m[b][\\\"n\\\"])\\n\"\n"
 
-        ".ascii \"        N = group[\\\"N\\\"]\\n\"\n"
-        ".ascii \"        sentinel_ = group[\\\"sentinel_\\\"]\\n\"\n"
         ".ascii \"        if self.is_regular_layout(group):\\n\"\n"
-        ".ascii \"            return pos == N-1 and at(N-1) == sentinel_\\n\"\n"
+        ".ascii \"            return pos == self.N-1 and at(self.N-1) == self.sentinel_\\n\"\n"
         ".ascii \"        else:\\n\"\n"
-        ".ascii \"            return pos == N-1 and (at(0) & 0x4000400040004000) == 0x4000 and (at(1) & 0x4000400040004000) == 0\\n\"\n"
+        ".ascii \"            return pos == self.N-1 and (at(0) & 0x4000400040004000) == 0x4000 and (at(1) & 0x4000400040004000) == 0\\n\"\n"
 
         ".ascii \"    def children(self):\\n\"\n"
         ".ascii \"        def generator():\\n\"\n"
-        ".ascii \"            table = self.val[\\\"table_\\\"]\\n\"\n"
+        ".ascii \"            pc_ = self.groups.cast(gdb.lookup_type(\\\"unsigned char\\\").pointer())\\n\"\n"
-        ".ascii \"            groups = self.cpo.to_address(table[\\\"arrays\\\"][\\\"groups_\\\"])\\n\"\n"
+        ".ascii \"            p_ = self.elements\\n\"\n"
-        ".ascii \"            elements = self.cpo.to_address(table[\\\"arrays\\\"][\\\"elements_\\\"])\\n\"\n"
-
-        ".ascii \"            pc_ = groups.cast(gdb.lookup_type(\\\"unsigned char\\\").pointer())\\n\"\n"
-        ".ascii \"            p_ = elements\\n\"\n"
         ".ascii \"            first_time = True\\n\"\n"
-        ".ascii \"            mask = 0\\n\"\n"
-        ".ascii \"            n0 = 0\\n\"\n"
-        ".ascii \"            n = 0\\n\"\n"
 
         ".ascii \"            count = 0\\n\"\n"
         ".ascii \"            while p_ != 0:\\n\"\n"
         ".ascii \"                # This if block mirrors the condition in the begin() call\\n\"\n"
-        ".ascii \"                if (not first_time) or (self.match_occupied(groups.dereference()) & 1):\\n\"\n"
+        ".ascii \"                if (not first_time) or (self.match_occupied(self.groups.dereference()) & 1):\\n\"\n"
         ".ascii \"                    pointer = BoostUnorderedHelpers.maybe_unwrap_foa_element(p_)\\n\"\n"
         ".ascii \"                    value = self.cpo.to_address(pointer).dereference()\\n\"\n"
         ".ascii \"                    if self.is_map:\\n\"\n"
@@ -241,17 +245,17 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
         ".ascii \"                    count += 1\\n\"\n"
         ".ascii \"                first_time = False\\n\"\n"
 
-        ".ascii \"                n0 = pc_.cast(gdb.lookup_type(\\\"uintptr_t\\\")) % groups.dereference().type.sizeof\\n\"\n"
+        ".ascii \"                n0 = pc_.cast(gdb.lookup_type(\\\"uintptr_t\\\")) % self.groups.dereference().type.sizeof\\n\"\n"
         ".ascii \"                pc_ = self.cpo.next(pc_, -n0)\\n\"\n"
 
-        ".ascii \"                mask = (self.match_occupied(pc_.cast(groups.type).dereference()) >> (n0+1)) << (n0+1)\\n\"\n"
+        ".ascii \"                mask = (self.match_occupied(pc_.cast(self.groups.type).dereference()) >> (n0+1)) << (n0+1)\\n\"\n"
         ".ascii \"                while mask == 0:\\n\"\n"
-        ".ascii \"                    pc_ = self.cpo.next(pc_, groups.dereference().type.sizeof)\\n\"\n"
+        ".ascii \"                    pc_ = self.cpo.next(pc_, self.groups.dereference().type.sizeof)\\n\"\n"
-        ".ascii \"                    p_ = self.cpo.next(p_, groups.dereference()[\\\"N\\\"])\\n\"\n"
+        ".ascii \"                    p_ = self.cpo.next(p_, self.N)\\n\"\n"
-        ".ascii \"                    mask = self.match_occupied(pc_.cast(groups.type).dereference())\\n\"\n"
+        ".ascii \"                    mask = self.match_occupied(pc_.cast(self.groups.type).dereference())\\n\"\n"
 
         ".ascii \"                n = BoostUnorderedHelpers.countr_zero(mask)\\n\"\n"
-        ".ascii \"                if self.is_sentinel(pc_.cast(groups.type).dereference(), n):\\n\"\n"
+        ".ascii \"                if self.is_sentinel(pc_.cast(self.groups.type).dereference(), n):\\n\"\n"
         ".ascii \"                    p_ = 0\\n\"\n"
         ".ascii \"                else:\\n\"\n"
         ".ascii \"                    pc_ = self.cpo.next(pc_, n)\\n\"\n"
@@ -411,4 +415,4 @@ __asm__(".pushsection \".debug_gdb_scripts\", \"MS\",%progbits,1\n"
 #endif // defined(__ELF__)
 #endif // !defined(BOOST_ALL_NO_EMBEDDED_GDB_SCRIPTS)
 
-#endif // !defined(BOOST_UNORDERED_UNORDERED_PRINTERS_HPP)
+#endif // !defined(BOOST_UNORDERED_DETAIL_UNORDERED_PRINTERS_HPP)

include/boost/unordered/unordered_flat_map.hpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024-2025 Joaquin M Lopez Munoz
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz
+// Copyright (C) 2026 Braden Ganetsky
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -14,6 +15,7 @@
 #include <boost/unordered/concurrent_flat_map_fwd.hpp>
 #include <boost/unordered/detail/foa/flat_map_types.hpp>
 #include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_container.hpp>
 #include <boost/unordered/detail/throw_exception.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
@@ -107,6 +109,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_map(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : unordered_flat_map(
+            fr, std::forward<R>(rg), size_type(0), hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit unordered_flat_map(allocator_type const& a)
           : unordered_flat_map(0, a)
       {
@@ -135,6 +150,41 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_map(FromRangeT&&, R&& rg, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+        :  unordered_flat_map(n, h, pred, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_map(
+        FromRangeT&& fr, R&& rg, size_type n, allocator_type const& a)
+          : unordered_flat_map(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_map(FromRangeT&& fr, R&& rg, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_map(fr, std::forward<R>(rg), n, h, key_equal(), a)
+      {
+      }
+#endif
+
       unordered_flat_map(unordered_flat_map const& other) : table_(other.table_)
       {
       }
@@ -182,9 +232,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       unordered_flat_map(
-        concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator>&& other)
+        concurrent_flat_map<Key2, T, Hash, KeyEqual, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -276,6 +327,16 @@ namespace boost {
         }
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      BOOST_FORCEINLINE void insert_range(R&& rg)
+      {
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) table_.emplace(*first++);
+      }
+#endif
+
       void insert(std::initializer_list<value_type> ilist)
       {
         this->insert(ilist.begin(), ilist.end());
@@ -754,6 +815,27 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
+
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -798,6 +880,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,

include/boost/unordered/unordered_flat_set.hpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024-2025 Joaquin M Lopez Munoz
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz
+// Copyright (C) 2026 Braden Ganetsky
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -14,6 +15,7 @@
 #include <boost/unordered/concurrent_flat_set_fwd.hpp>
 #include <boost/unordered/detail/foa/flat_set_types.hpp>
 #include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_container.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_flat_set_fwd.hpp>
@@ -103,6 +105,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_set(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : unordered_flat_set(
+            fr, std::forward<R>(rg), size_type(0), hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit unordered_flat_set(allocator_type const& a)
           : unordered_flat_set(0, a)
       {
@@ -131,6 +146,41 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_set(FromRangeT&&, R&& rg, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+        :  unordered_flat_set(n, h, pred, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_set(
+        FromRangeT&& fr, R&& rg, size_type n, allocator_type const& a)
+          : unordered_flat_set(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_flat_set(FromRangeT&& fr, R&& rg, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_set(fr, std::forward<R>(rg), n, h, key_equal(), a)
+      {
+      }
+#endif
+
       unordered_flat_set(unordered_flat_set const& other) : table_(other.table_)
       {
       }
@@ -178,9 +228,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       unordered_flat_set(
-        concurrent_flat_set<Key, Hash, KeyEqual, Allocator>&& other)
+        concurrent_flat_set<Key2, Hash, KeyEqual, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -287,6 +338,16 @@ namespace boost {
         }
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      void insert_range(R&& rg)
+      {
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) table_.emplace(*first++);
+      }
+#endif
+
       void insert(std::initializer_list<value_type> ilist)
       {
         this->insert(ilist.begin(), ilist.end());
@@ -572,6 +633,25 @@ namespace boost {
         typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -603,6 +683,29 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_set(std::initializer_list<T>, std::size_t, Allocator)
@@ -624,6 +727,18 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_flat_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_flat_set(std::initializer_list<T>, Allocator)

include/boost/unordered/unordered_map.hpp

@@ -1,7 +1,7 @@
 // Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
 // Copyright (C) 2005-2011 Daniel James.
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024 Joaquin M Lopez Munoz.
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz.
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -16,6 +16,7 @@
 #endif
 
 #include <boost/unordered/detail/map.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_fca_container.hpp>
 #include <boost/unordered/detail/throw_exception.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
@@ -92,6 +93,17 @@ namespace boost {
         const hasher& = hasher(), const key_equal& = key_equal(),
         const allocator_type& = allocator_type());
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_map(FromRangeT&&, R&&,
+        size_type = boost::unordered::detail::default_bucket_count,
+        const hasher& = hasher(), const key_equal& = key_equal(),
+        const allocator_type& = allocator_type());
+#endif
+
       unordered_map(unordered_map const&);
 
       unordered_map(unordered_map&& other)
@@ -126,6 +138,27 @@ namespace boost {
       unordered_map(
         InputIt, InputIt, size_type, const hasher&, const allocator_type&);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_map(FromRangeT&&, R&&, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_map(FromRangeT&&, R&&, size_type, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_map(
+        FromRangeT&&, R&&, size_type, const hasher&, const allocator_type&);
+#endif
+
       unordered_map(std::initializer_list<value_type>, const allocator_type&);
 
       unordered_map(
@@ -248,6 +281,11 @@ namespace boost {
 
       template <class InputIt> void insert(InputIt, InputIt);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <detail::container_compatible_range<std::pair<const K, T> > R>
+      void insert_range(R&&);
+#endif
+
       void insert(std::initializer_list<value_type>);
 
       // extract
@@ -622,6 +660,27 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_map(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
+
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -664,6 +723,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_map(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_map(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
@@ -742,6 +837,17 @@ namespace boost {
         const hasher& = hasher(), const key_equal& = key_equal(),
         const allocator_type& = allocator_type());
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_multimap(FromRangeT&&, R&&,
+        size_type = boost::unordered::detail::default_bucket_count,
+        const hasher& = hasher(), const key_equal& = key_equal(),
+        const allocator_type& = allocator_type());
+#endif
+
       unordered_multimap(unordered_multimap const&);
 
       unordered_multimap(unordered_multimap&& other)
@@ -777,6 +883,27 @@ namespace boost {
       unordered_multimap(
         InputIt, InputIt, size_type, const hasher&, const allocator_type&);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_multimap(FromRangeT&&, R&&, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_multimap(FromRangeT&&, R&&, size_type, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<std::pair<const K, T> > R
+      >
+      unordered_multimap(
+        FromRangeT&&, R&&, size_type, const hasher&, const allocator_type&);
+#endif
+
       unordered_multimap(
         std::initializer_list<value_type>, const allocator_type&);
 
@@ -894,6 +1021,11 @@ namespace boost {
 
       template <class InputIt> void insert(InputIt, InputIt);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <detail::container_compatible_range<std::pair<const K, T> > R>
+      void insert_range(R&&);
+#endif
+
       void insert(std::initializer_list<value_type>);
 
       // extract
@@ -1141,6 +1273,26 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multimap(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_multimap<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -1184,6 +1336,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multimap(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_multimap<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multimap(FromRangeT&&, R&&, Allocator)
+      -> unordered_multimap<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multimap(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_multimap<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_multimap(std::initializer_list<std::pair<Key, T> >, std::size_t,
@@ -1231,6 +1419,23 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_map<K, T, H, P, A>::unordered_map(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const key_equal& eql,
+      const allocator_type& a)
+        : table_(
+          boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+          hf, eql, a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class K, class T, class H, class P, class A>
     unordered_map<K, T, H, P, A>::unordered_map(unordered_map const& other)
         : table_(other.table_,
@@ -1303,6 +1508,7 @@ namespace boost {
       this->insert(f, l);
     }
 
+
     template <class K, class T, class H, class P, class A>
     template <class InputIt>
     unordered_map<K, T, H, P, A>::unordered_map(
@@ -1323,6 +1529,51 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_map<K, T, H, P, A>::unordered_map(
+      FromRangeT&&, R&& rg, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(
+              std::forward<R>(rg), detail::default_bucket_count),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_map<K, T, H, P, A>::unordered_map(
+      FromRangeT&&, R&& rg, size_type n, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_map<K, T, H, P, A>::unordered_map(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hf, key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class K, class T, class H, class P, class A>
     unordered_map<K, T, H, P, A>::unordered_map(
       std::initializer_list<value_type> list, const allocator_type& a)
@@ -1395,6 +1646,20 @@ namespace boost {
       }
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <detail::container_compatible_range<std::pair<const K, T> > R>
+    void unordered_map<K, T, H, P, A>::insert_range(R&& rg)
+    {
+      auto first = std::ranges::begin(rg);
+      auto last = std::ranges::end(rg);
+      if (first != last) {
+        table_.insert_range_unique(
+          table::extractor::extract(*first), first, last);
+      }
+    }
+#endif
+
     template <class K, class T, class H, class P, class A>
     void unordered_map<K, T, H, P, A>::insert(
       std::initializer_list<value_type> list)
@@ -1757,6 +2022,23 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_multimap<K, T, H, P, A>::unordered_multimap(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const key_equal& eql,
+      const allocator_type& a)
+        : table_(
+          boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+          hf, eql, a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class K, class T, class H, class P, class A>
     unordered_multimap<K, T, H, P, A>::unordered_multimap(
       unordered_multimap const& other)
@@ -1851,6 +2133,51 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_multimap<K, T, H, P, A>::unordered_multimap(
+      FromRangeT&&, R&& rg, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(
+              std::forward<R>(rg), detail::default_bucket_count),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_multimap<K, T, H, P, A>::unordered_multimap(
+      FromRangeT&&, R&& rg, size_type n, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class K, class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<std::pair<const K, T> > R
+    >
+    unordered_multimap<K, T, H, P, A>::unordered_multimap(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hf, key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class K, class T, class H, class P, class A>
     unordered_multimap<K, T, H, P, A>::unordered_multimap(
       std::initializer_list<value_type> list, const allocator_type& a)
@@ -1921,6 +2248,16 @@ namespace boost {
       table_.insert_range_equiv(first, last);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class K, class T, class H, class P, class A>
+    template <detail::container_compatible_range<std::pair<const K, T> > R>
+    void unordered_multimap<K, T, H, P, A>::insert_range(R&& rg)
+    {
+      table_.insert_range_equiv(std::ranges::begin(rg), std::ranges::end(rg));
+    }
+#endif
+
+
     template <class K, class T, class H, class P, class A>
     void unordered_multimap<K, T, H, P, A>::insert(
       std::initializer_list<value_type> list)

include/boost/unordered/unordered_node_map.hpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024-2025 Joaquin M Lopez Munoz
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz
+// Copyright (C) 2026 Braden Ganetsky
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -15,6 +16,7 @@
 #include <boost/unordered/detail/foa/node_map_handle.hpp>
 #include <boost/unordered/detail/foa/node_map_types.hpp>
 #include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_container.hpp>
 #include <boost/unordered/detail/throw_exception.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
@@ -114,6 +116,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_map(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : unordered_node_map(
+            fr, std::forward<R>(rg), size_type(0), hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit unordered_node_map(allocator_type const& a)
           : unordered_node_map(0, a)
       {
@@ -142,6 +157,41 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_map(FromRangeT&&, R&& rg, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+        :  unordered_node_map(n, h, pred, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_map(
+        FromRangeT&& fr, R&& rg, size_type n, allocator_type const& a)
+          : unordered_node_map(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_map(FromRangeT&& fr, R&& rg, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_map(fr, std::forward<R>(rg), n, h, key_equal(), a)
+      {
+      }
+#endif
+
       unordered_node_map(unordered_node_map const& other) : table_(other.table_)
       {
       }
@@ -189,9 +239,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       unordered_node_map(
-        concurrent_node_map<Key, T, Hash, KeyEqual, Allocator>&& other)
+        concurrent_node_map<Key2, T, Hash, KeyEqual, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -283,6 +334,16 @@ namespace boost {
         }
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      BOOST_FORCEINLINE void insert_range(R&& rg)
+      {
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) table_.emplace(*first++);
+      }
+#endif
+
       void insert(std::initializer_list<value_type> ilist)
       {
         this->insert(ilist.begin(), ilist.end());
@@ -828,6 +889,27 @@ namespace boost {
         boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::range_to_alloc_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash, Pred,
+        Allocator>;
+#endif
+
     template <class Key, class T,
       class Hash = boost::hash<std::remove_const_t<Key> >,
       class Pred = std::equal_to<std::remove_const_t<Key> >,
@@ -872,6 +954,42 @@ namespace boost {
         std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(FromRangeT&&, R&&, Allocator)
+      -> unordered_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>,
+        boost::hash<boost::unordered::detail::range_key_t<R> >,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_node_map<boost::unordered::detail::range_key_t<R>,
+        boost::unordered::detail::range_mapped_t<R>, Hash,
+        std::equal_to<boost::unordered::detail::range_key_t<R> >,
+        Allocator>;
+#endif
+
     template <class Key, class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_node_map(std::initializer_list<std::pair<Key, T> >, std::size_t,

include/boost/unordered/unordered_node_set.hpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024-2025 Joaquin M Lopez Munoz
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz
+// Copyright (C) 2026 Braden Ganetsky
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -16,6 +17,7 @@
 #include <boost/unordered/detail/foa/node_set_handle.hpp>
 #include <boost/unordered/detail/foa/node_set_types.hpp>
 #include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_container.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
 #include <boost/unordered/unordered_node_set_fwd.hpp>
@@ -112,6 +114,19 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_set(
+        FromRangeT&& fr, R&& rg, allocator_type const& a)
+          : unordered_node_set(
+            fr, std::forward<R>(rg), size_type(0), hasher(), key_equal(), a)
+      {
+      }
+#endif
+
       explicit unordered_node_set(allocator_type const& a)
           : unordered_node_set(0, a)
       {
@@ -140,6 +155,41 @@ namespace boost {
       {
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_set(FromRangeT&&, R&& rg, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+        :  unordered_node_set(n, h, pred, a)
+      {
+        this->insert_range(std::forward<R>(rg));
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_set(
+        FromRangeT&& fr, R&& rg, size_type n, allocator_type const& a)
+          : unordered_node_set(
+            fr, std::forward<R>(rg), n, hasher(), key_equal(), a)
+      {
+      }
+
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<value_type> R
+      >
+      unordered_node_set(FromRangeT&& fr, R&& rg, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_set(fr, std::forward<R>(rg), n, h, key_equal(), a)
+      {
+      }
+#endif
+
       unordered_node_set(unordered_node_set const& other) : table_(other.table_)
       {
       }
@@ -187,9 +237,10 @@ namespace boost {
       {
       }
 
-      template <bool avoid_explicit_instantiation = true>
+      template <typename Key2,
+        typename std::enable_if<std::is_same<Key, Key2>::value, int>::type = 0>
       unordered_node_set(
-        concurrent_node_set<Key, Hash, KeyEqual, Allocator>&& other)
+        concurrent_node_set<Key2, Hash, KeyEqual, Allocator>&& other)
           : table_(std::move(other.table_))
       {
       }
@@ -296,6 +347,16 @@ namespace boost {
         }
       }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<detail::container_compatible_range<value_type> R>
+      void insert_range(R&& rg)
+      {
+        auto first = std::ranges::begin(rg);
+        auto last = std::ranges::end(rg);
+        while (first != last) table_.emplace(*first++);
+      }
+#endif
+
       void insert(std::initializer_list<value_type> ilist)
       {
         this->insert(ilist.begin(), ilist.end());
@@ -648,6 +709,25 @@ namespace boost {
         typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -679,6 +759,29 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_node_set(std::initializer_list<T>, std::size_t, Allocator)
@@ -700,6 +803,18 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_node_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_node_set(std::initializer_list<T>, Allocator)

include/boost/unordered/unordered_set.hpp

@@ -1,7 +1,7 @@
 // Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
 // Copyright (C) 2005-2011 Daniel James.
 // Copyright (C) 2022-2023 Christian Mazakas
-// Copyright (C) 2024 Joaquin M Lopez Munoz.
+// Copyright (C) 2024-2026 Joaquin M Lopez Munoz.
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -15,6 +15,7 @@
 #pragma once
 #endif
 
+#include <boost/unordered/detail/ranges_support.hpp>
 #include <boost/unordered/detail/serialize_fca_container.hpp>
 #include <boost/unordered/detail/set.hpp>
 #include <boost/unordered/detail/type_traits.hpp>
@@ -88,6 +89,17 @@ namespace boost {
         const hasher& = hasher(), const key_equal& = key_equal(),
         const allocator_type& = allocator_type());
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_set(FromRangeT&&, R&&,
+        size_type = boost::unordered::detail::default_bucket_count,
+        const hasher& = hasher(), const key_equal& = key_equal(),
+        const allocator_type& = allocator_type());
+#endif
+
       unordered_set(unordered_set const&);
 
       unordered_set(unordered_set&& other)
@@ -122,6 +134,27 @@ namespace boost {
       unordered_set(
         InputIt, InputIt, size_type, const hasher&, const allocator_type&);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_set(FromRangeT&&, R&&, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_set(FromRangeT&&, R&&, size_type, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_set(
+        FromRangeT&&, R&&, size_type, const hasher&, const allocator_type&);
+#endif
+
       unordered_set(std::initializer_list<value_type>, const allocator_type&);
 
       unordered_set(
@@ -246,6 +279,11 @@ namespace boost {
 
       template <class InputIt> void insert(InputIt, InputIt);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <detail::container_compatible_range<T> R>
+      void insert_range(R&&);
+#endif
+
       void insert(std::initializer_list<value_type>);
 
       // extract
@@ -478,6 +516,25 @@ namespace boost {
       -> unordered_set<typename std::iterator_traits<InputIterator>::value_type,
         Hash, Pred, Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_set(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_set<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -507,6 +564,29 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_set(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_set(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_set(std::initializer_list<T>, std::size_t, Allocator)
@@ -527,6 +607,18 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_set(FromRangeT&&, R&&, Allocator)
+      -> unordered_set<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_set(std::initializer_list<T>, Allocator)
@@ -585,6 +677,18 @@ namespace boost {
         const hasher& = hasher(), const key_equal& = key_equal(),
         const allocator_type& = allocator_type());
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template<
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_multiset(FromRangeT&&, R&&,
+        size_type = boost::unordered::detail::default_bucket_count,
+        const hasher& = hasher(), const key_equal& = key_equal(),
+        const allocator_type& = allocator_type());
+#endif
+
+
       unordered_multiset(unordered_multiset const&);
 
       unordered_multiset(unordered_multiset&& other)
@@ -620,6 +724,27 @@ namespace boost {
       unordered_multiset(
         InputIt, InputIt, size_type, const hasher&, const allocator_type&);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_multiset(FromRangeT&&, R&&, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_multiset(FromRangeT&&, R&&, size_type, const allocator_type&);
+
+      template <
+        detail::convertible_to_from_range_t FromRangeT,
+        detail::container_compatible_range<T> R
+      >
+      unordered_multiset(
+        FromRangeT&&, R&&, size_type, const hasher&, const allocator_type&);
+#endif
+
       unordered_multiset(
         std::initializer_list<value_type>, const allocator_type&);
 
@@ -720,6 +845,11 @@ namespace boost {
 
       template <class InputIt> void insert(InputIt, InputIt);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+      template <detail::container_compatible_range<T> R>
+      void insert_range(R&&);
+#endif
+
       void insert(std::initializer_list<value_type>);
 
       // extract
@@ -942,6 +1072,25 @@ namespace boost {
         typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <
+      boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash =
+        boost::hash<std::ranges::range_value_t<R> >,
+      class Pred =
+        std::equal_to<std::ranges::range_value_t<R> >,
+      class Allocator = std::allocator<std::ranges::range_value_t<R> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multiset(FromRangeT&&, R&&,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+        Hash, Pred, Allocator>;
+#endif
+
     template <class T, class Hash = boost::hash<T>,
       class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
       class = std::enable_if_t<detail::is_hash_v<Hash> >,
@@ -973,6 +1122,29 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multiset(FromRangeT&&, R&&, std::size_t, Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multiset(
+      FromRangeT&&, R&&, std::size_t, Hash, Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+        Hash, std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_multiset(std::initializer_list<T>, std::size_t, Allocator)
@@ -994,6 +1166,18 @@ namespace boost {
         std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
         Allocator>;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <boost::unordered::detail::convertible_to_from_range_t FromRangeT,
+      std::ranges::input_range R,
+      class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_multiset(FromRangeT&&, R&&, Allocator)
+      -> unordered_multiset<std::ranges::range_value_t<R>,
+        boost::hash<std::ranges::range_value_t<R> >,
+        std::equal_to<std::ranges::range_value_t<R> >,
+        Allocator>;
+#endif
+
     template <class T, class Allocator,
       class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
     unordered_multiset(std::initializer_list<T>, Allocator)
@@ -1023,6 +1207,23 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_set<T, H, P, A>::unordered_set(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const key_equal& eql,
+      const allocator_type& a)
+        : table_(
+          boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+          hf, eql, a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class T, class H, class P, class A>
     unordered_set<T, H, P, A>::unordered_set(unordered_set const& other)
         : table_(other.table_,
@@ -1115,6 +1316,51 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_set<T, H, P, A>::unordered_set(
+      FromRangeT&&, R&& rg, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(
+              std::forward<R>(rg), detail::default_bucket_count),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_set<T, H, P, A>::unordered_set(
+      FromRangeT&&, R&& rg, size_type n, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_set<T, H, P, A>::unordered_set(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hf, key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class T, class H, class P, class A>
     unordered_set<T, H, P, A>::unordered_set(
       std::initializer_list<value_type> list, const allocator_type& a)
@@ -1187,6 +1433,20 @@ namespace boost {
       }
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <detail::container_compatible_range<T> R>
+    void unordered_set<T, H, P, A>::insert_range(R&& rg)
+    {
+      auto first = std::ranges::begin(rg);
+      auto last = std::ranges::end(rg);
+      if (first != last) {
+        table_.insert_range_unique(
+          table::extractor::extract(*first), first, last);
+      }
+    }
+#endif
+
     template <class T, class H, class P, class A>
     void unordered_set<T, H, P, A>::insert(
       std::initializer_list<value_type> list)
@@ -1420,6 +1680,23 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_multiset<T, H, P, A>::unordered_multiset(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const key_equal& eql,
+      const allocator_type& a)
+        : table_(
+          boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+          hf, eql, a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class T, class H, class P, class A>
     unordered_multiset<T, H, P, A>::unordered_multiset(
       unordered_multiset const& other)
@@ -1513,6 +1790,51 @@ namespace boost {
       this->insert(f, l);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_multiset<T, H, P, A>::unordered_multiset(
+      FromRangeT&&, R&& rg, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(
+              std::forward<R>(rg), detail::default_bucket_count),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_multiset<T, H, P, A>::unordered_multiset(
+      FromRangeT&&, R&& rg, size_type n, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hasher(), key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+
+    template <class T, class H, class P, class A>
+    template <
+      detail::convertible_to_from_range_t FromRangeT,
+      detail::container_compatible_range<T> R
+    >
+    unordered_multiset<T, H, P, A>::unordered_multiset(FromRangeT&&, R&& rg,
+      size_type n, const hasher& hf, const allocator_type& a)
+        : table_(
+            boost::unordered::detail::initial_size(std::forward<R>(rg), n),
+            hf, key_equal(), a)
+    {
+      this->insert_range(std::forward<R>(rg));
+    }
+#endif
+
     template <class T, class H, class P, class A>
     unordered_multiset<T, H, P, A>::unordered_multiset(
       std::initializer_list<value_type> list, const allocator_type& a)
@@ -1582,6 +1904,16 @@ namespace boost {
       table_.insert_range_equiv(first, last);
     }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    template <class T, class H, class P, class A>
+    template <detail::container_compatible_range<T> R>
+    void unordered_multiset<T, H, P, A>::insert_range(R&& rg)
+    {
+      table_.insert_range_equiv(
+        std::ranges::begin(rg), std::ranges::end(rg));
+    }
+#endif
+
     template <class T, class H, class P, class A>
     void unordered_multiset<T, H, P, A>::insert(
       std::initializer_list<value_type> list)

test/CMakeLists.txt

@@ -136,7 +136,17 @@ foa_tests(SOURCES exception/merge_exception_tests.cpp)
 
 # CFOA tests
 
-cfoa_tests(SOURCES cfoa/insert_tests.cpp COMPILE_OPTIONS $<$<CXX_COMPILER_ID:MSVC>:/bigobj>)
+set(cfoa_insert_test_options $<$<CXX_COMPILER_ID:MSVC>:/bigobj>)
+
+if(MINGW AND CMAKE_SIZEOF_VOID_P EQUAL 4)
+  list(APPEND cfoa_insert_test_options
+    -O0 -g0
+    --param=ggc-min-expand=10
+    --param=ggc-min-heapsize=16384
+  ) # GCC MinGW32 OOMs otherwise
+endif()
+
+cfoa_tests(SOURCES cfoa/insert_tests.cpp COMPILE_OPTIONS ${cfoa_insert_test_options})
 cfoa_tests(SOURCES cfoa/erase_tests.cpp)
 cfoa_tests(SOURCES cfoa/try_emplace_tests.cpp)
 cfoa_tests(SOURCES cfoa/emplace_tests.cpp)
@@ -163,4 +173,13 @@ cfoa_tests(SOURCES cfoa/rw_spinlock_test6.cpp)
 cfoa_tests(SOURCES cfoa/rw_spinlock_test7.cpp)
 cfoa_tests(SOURCES cfoa/rw_spinlock_test8.cpp)
 
+# Compile tests
+
+fca_tests(TYPE compile NAME explicit_instantiation_tests SOURCES unordered/explicit_instantiation_tests.cpp)
+foa_tests(TYPE compile NAME explicit_instantiation_tests SOURCES unordered/explicit_instantiation_tests.cpp)
+cfoa_tests(TYPE compile NAME explicit_instantiation_tests SOURCES cfoa/explicit_instantiation_tests.cpp)
+
+foa_tests(TYPE compile NAME conversion_operator_tests SOURCES unordered/conversion_operator_tests.cpp)
+cfoa_tests(TYPE compile NAME conversion_operator_tests SOURCES cfoa/conversion_operator_tests.cpp)
+
 endif()

test/Jamfile.v2

@@ -12,10 +12,7 @@ import config : requires ;
 
 path-constant TOP : . ;
 
-# Adding -Wundef is blocked on (at least)
+local gcc-flags = -Wsign-promo -Wconversion -Wsign-conversion -Wfloat-equal -Wshadow -Wundef -Wno-variadic-macros ;
-# https://github.com/boostorg/type_traits/issues/165
-
-local gcc-flags = -Wsign-promo -Wconversion -Wsign-conversion -Wfloat-equal -Wshadow -Wno-variadic-macros ;
 local clang-flags = $(gcc-flags) -Wno-c99-extensions ;
 local msvc-flags = /wd4494 ;
 
@@ -169,6 +166,9 @@ compile unordered/explicit_instantiation_tests.cpp :
 compile unordered/explicit_instantiation_tests.cpp : <define>BOOST_UNORDERED_FOA_TESTS : foa_explicit_instantiation_tests ;
 compile cfoa/explicit_instantiation_tests.cpp      :                                   : cfoa_explicit_instantiation_tests ;
 
+compile unordered/conversion_operator_tests.cpp : <define>BOOST_UNORDERED_FOA_TESTS : foa_conversion_operator_tests ;
+compile cfoa/conversion_operator_tests.cpp      :                                   : cfoa_conversion_operator_tests ;
+
 local FCA_EXCEPTION_TESTS =
   constructor_exception_tests
   copy_exception_tests
@@ -362,6 +362,7 @@ local CFOA_TESTS =
   pmr_allocator_tests
   stats_tests
   node_handle_allocator_tests
+  incomplete_tests
 ;
 
 for local test in $(CFOA_TESTS)
@@ -378,7 +379,8 @@ run cfoa/insert_tests.cpp
     : $(CPP11) <threading>multi
       <toolset>msvc:<cxxflags>/bigobj
       <toolset>gcc:<inlining>on
-      <toolset>gcc:<optimization>space
+      <toolset>gcc:<optimization>off
+      <toolset>gcc:<cxxflags>-g0
       <toolset>clang:<inlining>on
       <toolset>clang:<optimization>space
     : cfoa_insert_tests ;

test/cfoa/constructor_tests.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2023 Christian Mazakas
-// Copyright (C) 2023-2024 Joaquin M Lopez Munoz
+// Copyright (C) 2023-2026 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -10,6 +10,8 @@
 #include <boost/unordered/concurrent_node_map.hpp>
 #include <boost/unordered/concurrent_node_set.hpp>
 
+#include <list>
+
 test::seed_t initialize_seed(4122023);
 
 using test::default_generator;
@@ -702,6 +704,97 @@ namespace {
     }
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  template <class X, class IL>
+  void range_with_all_params(std::pair<X*, IL> p)
+  {
+    using value_type = typename X::value_type;
+    static constexpr auto value_type_cardinality = 
+      value_cardinality<value_type>::value;
+    using allocator_type = typename X::allocator_type;
+
+    auto init_list = p.second;
+    auto init_std_list = std::list<value_type>{init_list};
+    auto sentineled_rg = init_std_list | std::views::take(init_list.size());
+
+    {
+      raii::reset_counts();
+
+      X x(
+        boost::unordered::from_range,
+        init_list, 0, hasher(1), key_equal(2), allocator_type(3));
+
+      BOOST_TEST_EQ(x.size(), 11u);
+      BOOST_TEST_EQ(x.hash_function(), hasher(1));
+      BOOST_TEST_EQ(x.key_eq(), key_equal(2));
+      BOOST_TEST(x.get_allocator() == allocator_type(3));
+
+      BOOST_TEST_EQ(raii::default_constructor, 0u);
+      BOOST_TEST_EQ(
+        raii::copy_constructor, value_type_cardinality * init_list.size() / 2u);
+      BOOST_TEST_EQ(
+        raii::move_constructor, 0u);
+    }
+    check_raii_counts();
+
+    {
+      raii::reset_counts();
+
+      X x(boost::unordered::from_range, sentineled_rg, allocator_type(3));
+
+      BOOST_TEST_EQ(x.size(), 11u);
+      BOOST_TEST_EQ(x.hash_function(), hasher());
+      BOOST_TEST_EQ(x.key_eq(), key_equal());
+      BOOST_TEST(x.get_allocator() == allocator_type(3));
+
+      BOOST_TEST_EQ(raii::default_constructor, 0u);
+      BOOST_TEST_EQ(
+        raii::copy_constructor, value_type_cardinality * init_list.size() / 2u);
+      BOOST_TEST_EQ(
+        raii::move_constructor, 0u);
+    }
+    check_raii_counts();
+
+    {
+      raii::reset_counts();
+
+      X x(boost::unordered::from_range, init_list, 0, allocator_type(3));
+
+      BOOST_TEST_EQ(x.size(), 11u);
+      BOOST_TEST_EQ(x.hash_function(), hasher());
+      BOOST_TEST_EQ(x.key_eq(), key_equal());
+      BOOST_TEST(x.get_allocator() == allocator_type(3));
+
+      BOOST_TEST_EQ(raii::default_constructor, 0u);
+      BOOST_TEST_EQ(
+        raii::copy_constructor, value_type_cardinality * init_list.size() / 2u);
+      BOOST_TEST_EQ(
+        raii::move_constructor, 0u);
+    }
+    check_raii_counts();
+
+    {
+      raii::reset_counts();
+
+      X x(
+        boost::unordered::from_range, 
+        sentineled_rg, 0, hasher(1), allocator_type(3));
+
+      BOOST_TEST_EQ(x.size(), 11u);
+      BOOST_TEST_EQ(x.hash_function(), hasher(1));
+      BOOST_TEST_EQ(x.key_eq(), key_equal());
+      BOOST_TEST(x.get_allocator() == allocator_type(3));
+
+      BOOST_TEST_EQ(raii::default_constructor, 0u);
+      BOOST_TEST_EQ(
+        raii::copy_constructor, value_type_cardinality * init_list.size() / 2u);
+      BOOST_TEST_EQ(
+        raii::move_constructor, 0u);
+    }
+    check_raii_counts();
+  }
+#endif
+
   template <class X, class IL>
   void initializer_list_with_all_params(std::pair<X*, IL> p)
   {
@@ -1040,6 +1133,13 @@ UNORDERED_TEST(
   explicit_allocator,
   ((test_map)(test_node_map)(test_set)(test_node_set)))
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+UNORDERED_TEST(
+  range_with_all_params,
+  ((test_map_and_init_list)(test_node_map_and_init_list)
+   (test_set_and_init_list)(test_node_set_and_init_list)))
+#endif
+
 UNORDERED_TEST(
   initializer_list_with_all_params,
   ((test_map_and_init_list)(test_node_map_and_init_list)

test/cfoa/conversion_operator_tests.cpp

@@ -0,0 +1,42 @@
+// Copyright 2026 Braden Ganetsky
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/static_assert.hpp>
+#include <boost/unordered/concurrent_flat_map.hpp>
+#include <boost/unordered/concurrent_flat_set.hpp>
+#include <boost/unordered/concurrent_node_map.hpp>
+#include <boost/unordered/concurrent_node_set.hpp>
+// Don't include the FOA headers here!
+
+using c_flat_map = boost::unordered::concurrent_flat_map<int, int>;
+using c_flat_set = boost::unordered::concurrent_flat_set<int>;
+using c_node_map = boost::unordered::concurrent_node_map<int, int>;
+using c_node_set = boost::unordered::concurrent_node_set<int>;
+
+struct constrained_template_converter
+{
+  struct dummy
+  {
+  };
+  template <class T, typename std::enable_if<
+                       std::is_constructible<T, dummy>::value, int>::type = 0>
+  operator T() const
+  {
+    return T{};
+  }
+};
+
+// Check whether the corresponding FOA container gets instantiated.
+// The FOA headers aren't included, so this would fail to compile if the FOA
+// container was instantiated.
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<c_flat_map, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<c_flat_set, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<c_node_map, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<c_node_set, constrained_template_converter>::value));
+
+int main() { return 0; }

test/cfoa/incomplete_tests.cpp

@@ -0,0 +1,6 @@
+// Copyright 2025 Joaquin M Lopez Munoz.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#define BOOST_UNORDERED_CFOA_TESTS
+#include "../unordered/incomplete_test.cpp"

test/cfoa/insert_tests.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2023 Christian Mazakas
-// Copyright (C) 2023-2024 Joaquin M Lopez Munoz
+// Copyright (C) 2023-2026 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -148,12 +148,18 @@ namespace {
         values2.push_back(raii_convertible(v));
       }
 
-      thread_runner(values2, [&x](boost::span<raii_convertible> s) {
+      auto sz = x.size();
-        BOOST_TEST_EQ(x.insert(s.begin(), s.end()), s.size());
+      std::atomic<std::uint64_t> num_inserts{0};
+      std::atomic<std::uint64_t> num_attempted_inserts{0};
+      thread_runner(values2, [&x, &num_inserts, &num_attempted_inserts](boost::span<raii_convertible> s) {
+        num_inserts += x.insert(s.begin(), s.begin() + s.size() / 2);
+        num_inserts += x.insert(s.begin(), s.end());
+        num_attempted_inserts += s.size() + s.size() / 2;
       });
+      BOOST_TEST_EQ(x.size(), sz + num_inserts);
 
       BOOST_TEST_EQ(
-        raii::default_constructor, value_type_cardinality * values2.size());
+        raii::default_constructor, value_type_cardinality * num_attempted_inserts);
 #if BOOST_WORKAROUND(BOOST_GCC_VERSION, >= 50300) && \
     BOOST_WORKAROUND(BOOST_GCC_VERSION, <  50500)
       // some versions of old gcc have trouble eliding copies here
@@ -169,6 +175,39 @@ namespace {
     }
   } iterator_range_inserter;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  struct range_inserter_type
+  {
+    template <class T, class X> void operator()(std::vector<T>& values, X& x)
+    {
+      static constexpr auto value_type_cardinality = 
+        value_cardinality<typename X::value_type>::value;
+
+      std::vector<raii_convertible> values2;
+      values2.reserve(values.size());
+      for (auto const& v : values) { 
+        values2.push_back(raii_convertible(v));
+      }
+
+      auto sz = x.size();
+      std::atomic<std::uint64_t> num_inserts{0};
+      std::atomic<std::uint64_t> num_attempted_inserts{0};
+      thread_runner(values2, [&x, &num_inserts, &num_attempted_inserts](boost::span<raii_convertible> s) {
+        num_inserts += x.insert_range(s | std::views::take(s.size() / 2));
+        num_inserts += x.insert_range(s);
+        num_attempted_inserts += s.size() + s.size() / 2;
+      });
+      BOOST_TEST_EQ(x.size(), sz + num_inserts);
+
+      BOOST_TEST_EQ(
+        raii::default_constructor, value_type_cardinality * num_attempted_inserts);
+      BOOST_TEST_EQ(raii::copy_constructor, 0u);
+      BOOST_TEST_EQ(raii::copy_assignment, 0u);
+      BOOST_TEST_EQ(raii::move_assignment, 0u);
+    }
+  } range_inserter;
+#endif
+
   struct lvalue_insert_or_assign_copy_assign_type
   {
     template <class T, class X> void operator()(std::vector<T>& values, X& x)
@@ -792,6 +831,41 @@ namespace {
     }
   } iterator_range_insert_or_cvisit;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  struct insert_range_or_cvisit_type
+  {
+    template <class T, class X> void operator()(std::vector<T>& values, X& x)
+    {
+      static constexpr auto value_type_cardinality = 
+        value_cardinality<typename X::value_type>::value;
+
+      std::vector<raii_convertible> values2;
+      values2.reserve(values.size());
+      for (auto const& v : values) {
+        values2.push_back(raii_convertible(v));
+      }
+
+      std::atomic<std::uint64_t> num_invokes{0};
+      thread_runner(
+        values2, [&x, &num_invokes](boost::span<raii_convertible> s) {
+          BOOST_TEST_EQ(x.insert_range_or_cvisit(s,
+                          [&num_invokes](typename X::value_type const& v) {
+                            (void)v;
+                            ++num_invokes;
+                          }),
+            s.size());
+        });
+
+      BOOST_TEST_EQ(num_invokes, values.size() - x.size());
+
+      BOOST_TEST_EQ(
+        raii::default_constructor, value_type_cardinality * values2.size());
+      BOOST_TEST_EQ(raii::copy_constructor, 0u);
+      BOOST_TEST_GT(raii::move_constructor, 0u);
+    }
+  } insert_range_or_cvisit;
+#endif
+
   struct iterator_range_insert_and_cvisit_type
   {
     template <class T, class X> void operator()(std::vector<T>& values, X& x)
@@ -846,6 +920,55 @@ namespace {
     }
   } iterator_range_insert_and_cvisit;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  struct insert_range_and_cvisit_type
+  {
+    template <class T, class X> void operator()(std::vector<T>& values, X& x)
+    {
+      static constexpr auto value_type_cardinality = 
+        value_cardinality<typename X::value_type>::value;
+
+      // concurrent_flat_set visit is always const access
+      using arg_type = typename std::conditional<
+        std::is_same<typename X::key_type, typename X::value_type>::value,
+        typename X::value_type const,
+        typename X::value_type
+      >::type;
+
+      std::vector<raii_convertible> values2;
+      values2.reserve(values.size());
+      for (auto const& v : values) {
+        values2.push_back(raii_convertible(v));
+      }
+
+      std::atomic<std::uint64_t> num_inserts{0};
+      std::atomic<std::uint64_t> num_invokes{0};
+      thread_runner(values2,
+        [&x, &num_inserts, &num_invokes](boost::span<raii_convertible> s) {
+          BOOST_TEST_EQ(x.insert_range_and_cvisit(
+                          s,
+                          [&num_inserts](arg_type& v) {
+                            (void)v;
+                            ++num_inserts;
+                          },
+                          [&num_invokes](typename X::value_type const& v) {
+                            (void)v;
+                            ++num_invokes;
+                          }),
+            s.size());
+        });
+
+      BOOST_TEST_EQ(num_inserts, x.size());
+      BOOST_TEST_EQ(num_invokes, values.size() - x.size());
+
+      BOOST_TEST_EQ(
+        raii::default_constructor, value_type_cardinality * values2.size());
+      BOOST_TEST_EQ(raii::copy_constructor, 0u);
+      BOOST_TEST_GT(raii::move_constructor, 0u);
+    }
+  } insert_range_and_cvisit;
+#endif
+
   struct iterator_range_insert_or_visit_type
   {
     template <class T, class X> void operator()(std::vector<T>& values, X& x)
@@ -893,6 +1016,48 @@ namespace {
     }
   } iterator_range_insert_or_visit;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  struct insert_range_or_visit_type
+  {
+    template <class T, class X> void operator()(std::vector<T>& values, X& x)
+    {
+      static constexpr auto value_type_cardinality = 
+        value_cardinality<typename X::value_type>::value;
+
+      // concurrent_flat_set visit is always const access
+      using arg_type = typename std::conditional<
+        std::is_same<typename X::key_type, typename X::value_type>::value,
+        typename X::value_type const,
+        typename X::value_type
+      >::type;
+
+      std::vector<raii_convertible> values2;
+      values2.reserve(values.size());
+      for (auto const& v : values) {
+        values2.push_back(raii_convertible(v));
+      }
+
+      std::atomic<std::uint64_t> num_invokes{0};
+      thread_runner(
+        values2, [&x, &num_invokes](boost::span<raii_convertible> s) {
+          BOOST_TEST_EQ(x.insert_range_or_visit(s,
+                          [&num_invokes](arg_type& v) {
+                            (void)v;
+                            ++num_invokes;
+                          }),
+            s.size());
+        });
+
+      BOOST_TEST_EQ(num_invokes, values.size() - x.size());
+
+      BOOST_TEST_EQ(
+        raii::default_constructor, value_type_cardinality * values2.size());
+      BOOST_TEST_EQ(raii::copy_constructor, 0u);
+      BOOST_TEST_GT(raii::move_constructor, 0u);
+    }
+  } insert_range_or_visit;
+#endif
+
   struct iterator_range_insert_and_visit_type
   {
     template <class T, class X> void operator()(std::vector<T>& values, X& x)
@@ -947,6 +1112,55 @@ namespace {
     }
   } iterator_range_insert_and_visit;
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  struct insert_range_and_visit_type
+  {
+    template <class T, class X> void operator()(std::vector<T>& values, X& x)
+    {
+      static constexpr auto value_type_cardinality = 
+        value_cardinality<typename X::value_type>::value;
+
+      // concurrent_flat_set visit is always const access
+      using arg_type = typename std::conditional<
+        std::is_same<typename X::key_type, typename X::value_type>::value,
+        typename X::value_type const,
+        typename X::value_type
+      >::type;
+
+      std::vector<raii_convertible> values2;
+      values2.reserve(values.size());
+      for (auto const& v : values) {
+        values2.push_back(raii_convertible(v));
+      }
+
+      std::atomic<std::uint64_t> num_inserts{0};
+      std::atomic<std::uint64_t> num_invokes{0};
+      thread_runner(values2,
+        [&x, &num_inserts, &num_invokes](boost::span<raii_convertible> s) {
+          BOOST_TEST_EQ(x.insert_range_and_visit(
+                          s,
+                          [&num_inserts](arg_type& v) {
+                            (void)v;
+                            ++num_inserts;
+                          },
+                          [&num_invokes](typename X::value_type const& v) {
+                            (void)v;
+                            ++num_invokes;
+                          }),
+            s.size());
+        });
+
+      BOOST_TEST_EQ(num_inserts, x.size());
+      BOOST_TEST_EQ(num_invokes, values.size() - x.size());
+
+      BOOST_TEST_EQ(
+        raii::default_constructor, value_type_cardinality * values2.size());
+      BOOST_TEST_EQ(raii::copy_constructor, 0u);
+      BOOST_TEST_GT(raii::move_constructor, 0u);
+    }
+  } insert_range_and_visit;
+#endif
+
   struct non_copyable_function
   {
     non_copyable_function() = default;
@@ -1010,9 +1224,11 @@ namespace {
       {
         X x;
 
-        thread_runner(dummy, [&x, &init_list](boost::span<raii>) {
+        std::atomic<std::uint64_t> num_inserts{0};
-          BOOST_TEST_EQ(x.insert(init_list), init_list.size());
+        thread_runner(dummy, [&x, &init_list, &num_inserts](boost::span<raii>) {
+          num_inserts += x.insert(init_list);
         });
+        BOOST_TEST_EQ(num_inserts, x.size());
 
         BOOST_TEST_EQ(x.size(), reference_cont.size());
 
@@ -1257,16 +1473,31 @@ UNORDERED_TEST(
   ((map_and_init_list)(node_map_and_init_list)
    (set_and_init_list)(node_set_and_init_list)))
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+#define RANGE_INSERTER (range_inserter)
+#define INSERT_RANGE_OR_CVISIT (insert_range_or_cvisit)
+#define INSERT_RANGE_OR_VISIT (insert_range_or_visit)
+#define INSERT_RANGE_AND_CVISIT (insert_range_and_cvisit)
+#define INSERT_RANGE_AND_VISIT (insert_range_and_visit)
+#else
+#define RANGE_INSERTER
+#define INSERT_RANGE_OR_CVISIT
+#define INSERT_RANGE_OR_VISIT
+#define INSERT_RANGE_AND_CVISIT
+#define INSERT_RANGE_AND_VISIT
+#endif
+
 UNORDERED_TEST(
   insert,
   ((map)(fancy_map)(node_map)(fancy_node_map)
    (set)(fancy_set)(node_set)(fancy_node_set))
   ((value_type_generator_factory)(init_type_generator_factory))
   ((lvalue_inserter)(rvalue_inserter)(iterator_range_inserter)
-   (norehash_lvalue_inserter)(norehash_rvalue_inserter)
+   RANGE_INSERTER (norehash_lvalue_inserter)(norehash_rvalue_inserter)
    (lvalue_insert_or_cvisit)(lvalue_insert_or_visit)
    (rvalue_insert_or_cvisit)(rvalue_insert_or_visit)
-   (iterator_range_insert_or_cvisit)(iterator_range_insert_or_visit))
+   (iterator_range_insert_or_cvisit)(iterator_range_insert_or_visit)
+   INSERT_RANGE_OR_CVISIT INSERT_RANGE_OR_VISIT )
   ((default_generator)(sequential)(limited_range)))
 
 UNORDERED_TEST(
@@ -1276,7 +1507,8 @@ UNORDERED_TEST(
   ((value_type_generator_factory)(init_type_generator_factory))
   ((lvalue_insert_and_cvisit)(lvalue_insert_and_visit)
    (rvalue_insert_and_cvisit)(rvalue_insert_and_visit)
-   (iterator_range_insert_and_cvisit)(iterator_range_insert_and_visit))
+   (iterator_range_insert_and_cvisit)(iterator_range_insert_and_visit)
+   INSERT_RANGE_AND_CVISIT INSERT_RANGE_AND_VISIT )
   ((default_generator)(sequential)(limited_range)))
 
  UNORDERED_TEST(

test/cmake_subdir_test/CMakeLists.txt

@@ -18,14 +18,9 @@ assert
 config
 container_hash
 core
-move
 mp11
 predef
-preprocessor
-static_assert
 throw_exception
-tuple
-type_traits
 
 # Secondary dependencies
 

test/helpers/pmr.hpp

@@ -11,6 +11,7 @@
 #ifndef BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
 
 #include <memory_resource>
+#include <new>
 
 namespace test {
   class counted_new_delete_resource : public std::pmr::memory_resource
@@ -25,17 +26,45 @@ namespace test {
     void* do_allocate(std::size_t bytes, std::size_t alignment) override
     {
       _count += bytes;
+
+#if defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606L
+
       return ::operator new(bytes, std::align_val_t(alignment));
+
+#else
+
+      return ::operator new(bytes);
+      (void)alignment;
+
+#endif
     }
 
     void do_deallocate(
       void* p, std::size_t bytes, std::size_t alignment) override
     {
       _count -= bytes;
-#if __cpp_sized_deallocation
+
+#if defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606L
+# if defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309L
+
       ::operator delete(p, bytes, std::align_val_t(alignment));
-#else
+
+# else
+
       ::operator delete(p, std::align_val_t(alignment));
+
+# endif
+#else
+# if defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309L
+
+      ::operator delete(p, bytes);
+
+# else
+
+      ::operator delete(p);
+      (void)alignment;
+
+# endif
 #endif
     }
 

test/unordered/constructor_tests.cpp

@@ -1,6 +1,7 @@
 
 // Copyright 2006-2010 Daniel James.
 // Copyright (C) 2022-2023 Christian Mazakas
+// Copyright (C) 2026 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -14,6 +15,7 @@
 #include "../helpers/tracker.hpp"
 #include "../objects/test.hpp"
 
+#include <list>
 #include <vector>
 
 namespace constructor_tests {
@@ -337,6 +339,205 @@ namespace constructor_tests {
     //
     std::vector<value_type> expected(vec.begin(), vec.begin() + 3);
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    auto std_list = std::list{vec[0], vec[1], vec[2]};
+    auto sentineled_rg = std_list | std::views::take(3);
+
+    UNORDERED_SUB_TEST("Range construct 1")
+    {
+      test::check_instances check_;
+
+      {
+        T x(boost::unordered::from_range, list);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(test::equivalent(x.hash_function(), hf));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+      }
+
+      {
+        T x(boost::unordered::from_range, std::vector{vec[0], vec[1], vec[2]});
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST_GT(x.bucket_count(), 0u);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 2")
+    {
+      test::check_instances check_;
+
+      {
+        T x(boost::unordered::from_range, list, 1000);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 1000);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+      }
+
+      {
+        T x(boost::unordered::from_range, sentineled_rg, 1000);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 1000);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 3")
+    {
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, list, 10, hf1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+      }
+
+      {
+        test::check_instances check_;
+
+        T x(
+          boost::unordered::from_range, std::vector{vec[0], vec[1], vec[2]},
+          10, hf1);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 4")
+    {
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, list, 10, hf1, eq1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+      }
+
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, sentineled_rg, 10, hf1, eq1);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 5")
+    {
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, list, 10, hf1, eq1, al1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+      }
+
+      {
+        test::check_instances check_;
+
+        T x(
+          boost::unordered::from_range, 
+          std::vector{vec[0], vec[1], vec[2]}, 10, hf1, eq1, al1);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.key_eq(), eq1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 6")
+    {
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, list, 10, al1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+      }
+
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, sentineled_rg, 10, al1);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 7")
+    {
+      {
+        test::check_instances check_;
+
+        T x(boost::unordered::from_range, list, 10, hf1, al1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+      }
+
+      {
+        test::check_instances check_;
+
+        T x(
+          boost::unordered::from_range, 
+          std::vector{vec[0], vec[1], vec[2]}, 10, hf1, al1);
+        BOOST_TEST_NOT(x.empty());
+        BOOST_TEST(x.bucket_count() >= 10);
+        BOOST_TEST(test::equivalent(x.hash_function(), hf1));
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+        test::check_container(x, expected);
+      }
+    }
+
+    UNORDERED_SUB_TEST("Range construct 8")
+    {
+      test::check_instances check_;
+
+      {
+        T x(boost::unordered::from_range, list, al1);
+        BOOST_TEST(x.empty());
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+      }
+
+      {
+        T x(boost::unordered::from_range, sentineled_rg, al1);
+        BOOST_TEST(test::equivalent(x.get_allocator(), al1));
+        test::check_container(x, expected);
+      }
+    }
+#endif
+
     UNORDERED_SUB_TEST("Initializer list construct 1")
     {
       test::check_instances check_;

test/unordered/conversion_operator_tests.cpp

@@ -0,0 +1,46 @@
+// Copyright 2026 Braden Ganetsky
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if !defined(BOOST_UNORDERED_FOA_TESTS)
+#error "This test is only for the FOA-style conatiners"
+#endif
+
+#include <boost/static_assert.hpp>
+#include <boost/unordered/unordered_flat_map.hpp>
+#include <boost/unordered/unordered_flat_set.hpp>
+#include <boost/unordered/unordered_node_map.hpp>
+#include <boost/unordered/unordered_node_set.hpp>
+// Don't include the CFOA headers here!
+
+using flat_map = boost::unordered::unordered_flat_map<int, int>;
+using flat_set = boost::unordered::unordered_flat_set<int>;
+using node_map = boost::unordered::unordered_node_map<int, int>;
+using node_set = boost::unordered::unordered_node_set<int>;
+
+struct constrained_template_converter
+{
+  struct dummy
+  {
+  };
+  template <class T, typename std::enable_if<
+                       std::is_constructible<T, dummy>::value, int>::type = 0>
+  operator T() const
+  {
+    return T{};
+  }
+};
+
+// Check whether the corresponding CFOA container gets instantiated.
+// The CFOA headers aren't included, so this would fail to compile if the CFOA
+// container was instantiated.
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<flat_map, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<flat_set, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<node_map, constrained_template_converter>::value));
+BOOST_STATIC_ASSERT(
+  (!std::is_constructible<node_set, constrained_template_converter>::value));
+
+int main() { return 0; }

test/unordered/deduction_tests.cpp

@@ -1,19 +1,26 @@
 
 // Copyright 2017-2018 Daniel James.
+// Copyright 2026 Joaquin M Lopez Munoz.
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+#include <boost/unordered_map.hpp>
+#include <iostream>
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
 #include <boost/core/lightweight_test_trait.hpp>
 #include <boost/unordered_map.hpp>
 #include <boost/unordered_set.hpp>
-#include <iostream>
-#include <vector>
-
-#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
-
 #include <boost/unordered/unordered_flat_map.hpp>
 #include <boost/unordered/unordered_flat_set.hpp>
+#include <boost/unordered/unordered_node_map.hpp>
+#include <boost/unordered/unordered_node_set.hpp>
 #include <boost/unordered/concurrent_flat_map.hpp>
+#include <boost/unordered/concurrent_flat_set.hpp>
+#include <boost/unordered/concurrent_node_map.hpp>
+#include <boost/unordered/concurrent_node_set.hpp>
+#include <vector>
 
 struct hash_equals
 {
@@ -87,6 +94,44 @@ template <template <class...> class UnorderedMap> void map_tests()
                      test_allocator<std::pair<const int, int> > >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*
+   template<ranges::input_range R, class Hash = hash<range-key-type<R>>,
+            class Pred = equal_to<range-key-type<R>>,
+            class Allocator = allocator<range-to-alloc-type<R>>>
+     unordered_map(from_range_t, R&&, 
+                   typename see below::size_type = see below,
+                   Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+       -> unordered_map<
+            range-key-type<R>, range-mapped-type<R>, Hash, Pred, Allocator>;
+   */
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x);
+    BOOST_TEST_TRAIT_SAME(decltype(m), UnorderedMap<int, int>);
+  }
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x, 0, std::hash<int>());
+    BOOST_TEST_TRAIT_SAME(decltype(m), UnorderedMap<int, int, std::hash<int> >);
+  }
+
+  {
+    UnorderedMap m(
+      boost::unordered::from_range, x, 0, std::hash<int>(), std::equal_to<int>());
+    BOOST_TEST_TRAIT_SAME(
+      decltype(m), UnorderedMap<int, int, std::hash<int>, std::equal_to<int> >);
+  }
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x, 0, std::hash<int>(),
+      std::equal_to<int>(), pair_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(m), UnorderedMap<int, int, std::hash<int>, std::equal_to<int>,
+                     test_allocator<std::pair<const int, int> > >);
+  }
+#endif
+
   /*
   template<class Key, class T, class Hash = hash<Key>,
            class Pred = equal_to<Key>, class Allocator = allocator<pair<const
@@ -162,6 +207,24 @@ template <template <class...> class UnorderedMap> void map_tests()
                      test_allocator<std::pair<const int, int> > >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*
+   template<ranges::input_range R, class Allocator>
+      unordered_map(
+        from_range_t, R&&, typename see below::size_type, Allocator)
+        -> unordered_map<
+             range-key-type<R>, range-mapped-type<R>, hash<range-key-type<R>>,
+             equal_to<range-key-type<R>>, Allocator>;
+   */
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x, 0u, pair_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(m), UnorderedMap<int, int, boost::hash<int>, std::equal_to<int>,
+                     test_allocator<std::pair<const int, int> > >);
+  }
+#endif
+
   /*
     template<class InputIterator, class Allocator>
     unordered_map(InputIterator, InputIterator, Allocator)
@@ -178,6 +241,23 @@ template <template <class...> class UnorderedMap> void map_tests()
                      test_allocator<std::pair<const int, int> > >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*
+   template<ranges::input_range R, class Allocator>
+     unordered_map(from_range_t, R&&, Allocator)
+       -> unordered_map<
+            range-key-type<R>, range-mapped-type<R>, hash<range-key-type<R>>,
+            equal_to<range-key-type<R>>, Allocator>;
+  */
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x, pair_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(m), UnorderedMap<int, int, boost::hash<int>, std::equal_to<int>,
+                     test_allocator<std::pair<const int, int> > >);
+  }
+#endif
+
   /*
   template<class InputIterator, class Hash, class Allocator>
     unordered_map(InputIterator, InputIterator, typename see below::size_type,
@@ -194,6 +274,23 @@ template <template <class...> class UnorderedMap> void map_tests()
                      test_allocator<std::pair<const int, int> > >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*
+   template<ranges::input_range R, class Hash, class Allocator>
+     unordered_map(
+       from_range_t, R&&, typename see below::size_type, Hash, Allocator)
+       -> unordered_map<range-key-type<R>, range-mapped-type<R>, Hash,
+                        equal_to<range-key-type<R>>, Allocator>;
+  */
+
+  {
+    UnorderedMap m(boost::unordered::from_range, x, 0u, f, pair_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(m), UnorderedMap<int, int, hash_equals, std::equal_to<int>,
+                     test_allocator<std::pair<const int, int> > >);
+  }
+#endif
+
   /*
     template<class Key, class T, typename Allocator>
     unordered_map(initializer_list<pair<const Key, T>>, typename see
@@ -305,6 +402,45 @@ template <template <class...> class UnorderedSet> void set_tests()
                      test_allocator<int> >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*   
+   template<ranges::input_range R,
+            class Hash = hash<ranges::range_value_t<R>>,
+            class Pred = equal_to<ranges::range_value_t<R>>,
+            class Allocator = allocator<ranges::range_value_t<R>>>
+     unordered_set(from_range_t, R&&, 
+                   typename see below::size_type = see below,
+                   Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+       -> unordered_set<ranges::range_value_t<R>, Hash, Pred, Allocator>;   
+   */
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y);
+    BOOST_TEST_TRAIT_SAME(decltype(s), UnorderedSet<int>);
+  }
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y, 0, std::hash<int>());
+    BOOST_TEST_TRAIT_SAME(decltype(s), UnorderedSet<int, std::hash<int> >);
+  }
+
+  {
+    UnorderedSet s(
+      boost::unordered::from_range, y, 0, std::hash<int>(),
+      std::equal_to<int>());
+    BOOST_TEST_TRAIT_SAME(
+      decltype(s), UnorderedSet<int, std::hash<int>, std::equal_to<int> >);
+  }
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y, 0, std::hash<int>(),
+      std::equal_to<int>(), int_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(s), UnorderedSet<int, std::hash<int>, std::equal_to<int>,
+                     test_allocator<int> >);
+  }
+#endif
+
   /* template<class T,
            class Hash = std::hash<T>,
            class Pred = std::equal_to<T>,
@@ -358,6 +494,24 @@ template <template <class...> class UnorderedSet> void set_tests()
                      test_allocator<int> >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /* 
+   template<ranges::input_range R, class Allocator>
+      unordered_set(from_range_t, R&&, 
+                    typename see below::size_type, Allocator)
+        -> unordered_set<ranges::range_value_t<R>, 
+                         hash<ranges::range_value_t<R>>,
+                         equal_to<ranges::range_value_t<R>>, Allocator>;
+   */
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y, 0u, int_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(s), UnorderedSet<int, boost::hash<int>, std::equal_to<int>,
+                     test_allocator<int> >);
+  }
+#endif
+
   /* template<class InputIt, class Hash, class Alloc>
   unordered_set(InputIt, InputIt, typename see below::size_type, Hash, Alloc)
     -> unordered_set<typename std::iterator_traits<InputIt>::value_type, Hash,
@@ -370,6 +524,22 @@ template <template <class...> class UnorderedSet> void set_tests()
       UnorderedSet<int, hash_equals, std::equal_to<int>, test_allocator<int> >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /* 
+   template<ranges::input_range R, class Hash, class Allocator>
+     unordered_set(from_range_t, R&&, typename see below::size_type,
+                   Hash, Allocator)
+       -> unordered_set<ranges::range_value_t<R>, Hash,
+                        equal_to<ranges::range_value_t<R>>, Allocator>;  
+   */
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y, 0u, f, int_allocator);
+    BOOST_TEST_TRAIT_SAME(decltype(s),
+      UnorderedSet<int, hash_equals, std::equal_to<int>, test_allocator<int> >);
+  }
+#endif
+
   /*   template<class T, class Allocator>
   unordered_set(std::initializer_list<T>, typename see below::size_type,
   Allocator)
@@ -408,6 +578,23 @@ template <template <class...> class UnorderedSet> void set_tests()
                      test_allocator<int> >);
   }
 
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+  /*
+   template<ranges::input_range R, class Allocator>
+     unordered_set(from_range_t, R&&, Allocator)
+       -> unordered_set<ranges::range_value_t<R>, 
+                        hash<ranges::range_value_t<R>>,
+                        equal_to<ranges::range_value_t<R>>, Allocator>;
+   */
+
+  {
+    UnorderedSet s(boost::unordered::from_range, y, int_allocator);
+    BOOST_TEST_TRAIT_SAME(
+      decltype(s), UnorderedSet<int, boost::hash<int>, std::equal_to<int>,
+                     test_allocator<int> >);
+  }
+#endif
+
   /*
   template<class T, class Allocator>
     unordered_set(initializer_list<T>, Allocator)
@@ -433,10 +620,15 @@ int main()
   map_tests<boost::unordered_map>();
   map_tests<boost::unordered_multimap>();
   map_tests<boost::unordered_flat_map>();
+  map_tests<boost::unordered_node_map>();
   map_tests<boost::concurrent_flat_map>();
+  map_tests<boost::concurrent_node_map>();
   set_tests<boost::unordered_set>();
   set_tests<boost::unordered_multiset>();
   set_tests<boost::unordered_flat_set>();
+  set_tests<boost::unordered_node_set>();
+  set_tests<boost::concurrent_flat_set>();
+  set_tests<boost::concurrent_node_set>();
 
   return boost::report_errors();
 #endif

test/unordered/incomplete_test.cpp

@@ -1,17 +1,28 @@
 
 // Copyright 2009 Daniel James.
 // Copyright 2022-2023 Christian Mazakas.
+// Copyright 2025 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #include "../helpers/unordered.hpp"
+#ifdef BOOST_UNORDERED_CFOA_TESTS
+#include <boost/unordered/concurrent_flat_set.hpp>
+#include <boost/unordered/concurrent_flat_map.hpp>
+#include <boost/unordered/concurrent_node_map.hpp>
+#include <boost/unordered/concurrent_node_set.hpp>
+#endif
+
 
 #include <utility>
 
 namespace x {
   struct D
   {
-#ifdef BOOST_UNORDERED_FOA_TESTS
+#if defined(BOOST_UNORDERED_CFOA_TESTS)
+    boost::concurrent_flat_map<D, D> x;
+    boost::concurrent_node_map<D, D> y;
+#elif defined(BOOST_UNORDERED_FOA_TESTS)
     boost::unordered_flat_map<D, D> x;
     boost::unordered_node_map<D, D> y;
 #else
@@ -30,26 +41,36 @@ namespace incomplete_test {
 
   // Declare some instances
 
-#ifdef BOOST_UNORDERED_FOA_TESTS
+#if defined(BOOST_UNORDERED_CFOA_TESTS)
+  typedef boost::concurrent_flat_map<value, value, hash, equals,
+    allocator<std::pair<value const, value> > >
+    map1;
+  typedef boost::concurrent_flat_set<value, hash, equals, allocator<value> > set1;
+  typedef boost::concurrent_node_map<value, value, hash, equals,
+    allocator<std::pair<value const, value> > >
+    map2;
+  typedef boost::concurrent_node_set<value, hash, equals, allocator<value> >
+    set2;
+#elif defined(BOOST_UNORDERED_FOA_TESTS)
   typedef boost::unordered_flat_map<value, value, hash, equals,
     allocator<std::pair<value const, value> > >
-    map;
+    map1;
-  typedef boost::unordered_flat_set<value, hash, equals, allocator<value> > set;
+  typedef boost::unordered_flat_set<value, hash, equals, allocator<value> > set1;
   typedef boost::unordered_node_map<value, value, hash, equals,
     allocator<std::pair<value const, value> > >
-    multimap;
+    map2;
   typedef boost::unordered_node_set<value, hash, equals, allocator<value> >
-    multiset;
+    set2;
 #else
   typedef boost::unordered_map<value, value, hash, equals,
     allocator<std::pair<value const, value> > >
-    map;
+    map1;
   typedef boost::unordered_multimap<value, value, hash, equals,
     allocator<std::pair<value const, value> > >
-    multimap;
+    map2;
-  typedef boost::unordered_set<value, hash, equals, allocator<value> > set;
+  typedef boost::unordered_set<value, hash, equals, allocator<value> > set1;
   typedef boost::unordered_multiset<value, hash, equals, allocator<value> >
-    multiset;
+    set2;
 #endif
 
   // Now define the types which are stored as members, as they are needed for
@@ -132,24 +153,60 @@ namespace incomplete_test {
     boost::unordered_multiset<struct4, hash, equals, allocator<struct4> > x;
   };
 #endif
-  // Now define the value type.
-
-  struct value
-  {
-  };
 
   // Create some instances.
 
-  incomplete_test::map m1;
+  incomplete_test::map1 m1;
-  incomplete_test::multimap m2;
+#ifndef BOOST_UNORDERED_CFOA_TESTS
-  incomplete_test::set s1;
+  incomplete_test::map1::iterator itm1;
-  incomplete_test::multiset s2;
+  incomplete_test::map1::const_iterator citm1;
+#ifndef BOOST_UNORDERED_FOA_TESTS
+  incomplete_test::map1::local_iterator litm1;
+  incomplete_test::map1::const_local_iterator clitm1;
+#endif
+#endif
+
+  incomplete_test::map2 m2;
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+  incomplete_test::map2::iterator itm2;
+  incomplete_test::map2::const_iterator citm2;
+#ifndef BOOST_UNORDERED_FOA_TESTS
+  incomplete_test::map2::local_iterator litm2;
+  incomplete_test::map2::const_local_iterator clitm2;
+#endif
+#endif
+
+  incomplete_test::set1 s1;
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+  incomplete_test::set1::iterator its1;
+  incomplete_test::set1::const_iterator cits1;
+#ifndef BOOST_UNORDERED_FOA_TESTS
+  incomplete_test::set1::local_iterator lits1;
+  incomplete_test::set1::const_local_iterator clits1;
+#endif
+#endif
+
+  incomplete_test::set2 s2;
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+  incomplete_test::set2::iterator its2;
+  incomplete_test::set2::const_iterator cits2;
+#ifndef BOOST_UNORDERED_FOA_TESTS
+  incomplete_test::set2::local_iterator lits2;
+  incomplete_test::set2::const_local_iterator clits2;
+#endif
+#endif
 
   incomplete_test::struct1 c1;
   incomplete_test::struct2 c2;
   incomplete_test::struct3 c3;
   incomplete_test::struct4 c4;
 
+  // Now define the value type.
+
+  struct value
+  {
+  };
+
   // Now declare, but don't define, the operators required for comparing
   // elements.
 
@@ -171,11 +228,45 @@ namespace incomplete_test {
   void use_types()
   {
     incomplete_test::value x;
-    m1[x] = x;
+    m1.insert(std::make_pair(x, x));
-    m2.insert(std::make_pair(x, x));
+#ifndef BOOST_UNORDERED_CFOA_TESTS
-    s1.insert(x);
+    itm1 = m1.begin();
-    s2.insert(x);
+    citm1 = m1.cbegin();
+#ifndef BOOST_UNORDERED_FOA_TESTS
+    litm1 = m1.begin(0);
+    clitm1 = m1.cbegin(0);
+#endif
+#endif
 
+    m2.insert(std::make_pair(x, x));
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+    itm2 = m2.begin();
+    citm2 = m2.cbegin();
+#ifndef BOOST_UNORDERED_FOA_TESTS
+    litm2 = m2.begin(0);
+    clitm2 = m2.cbegin(0);
+#endif
+#endif
+
+    s1.insert(x);
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+    its1 = s1.begin();
+    cits1 = s1.cbegin();
+#ifndef BOOST_UNORDERED_FOA_TESTS
+    lits1 = s1.begin(0);
+    clits1 = s1.cbegin(0);
+#endif
+#endif
+
+    s2.insert(x);
+#ifndef BOOST_UNORDERED_CFOA_TESTS
+    its2 = s2.begin();
+    cits2 = s2.cbegin();
+#ifndef BOOST_UNORDERED_FOA_TESTS
+    lits2 = s2.begin(0);
+    clits2 = s2.cbegin(0);
+#endif
+#endif
     c1.x.insert(std::make_pair(c1, c1));
     c2.x.insert(std::make_pair(c2, c2));
     c3.x.insert(c3);

test/unordered/insert_tests.cpp

@@ -1,6 +1,7 @@
 
 // Copyright 2006-2010 Daniel James.
 // Copyright (C) 2022-2023 Christian Mazakas
+// Copyright (C) 2026 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -405,6 +406,27 @@ namespace insert_tests {
         test::check_equivalent_keys(x);
       }
     }
+
+#if !defined(BOOST_UNORDERED_NO_RANGES)
+    UNORDERED_SUB_TEST("insert_range tests")
+    {
+      test::check_instances check_;
+
+      X x;
+
+      test::random_values<X> v(1000, generator);
+      x.insert_range(v);
+
+      test::check_container(x, v);
+      test::check_equivalent_keys(x);
+
+      x.clear();
+      x.insert_range(v | std::views::take(v.size()));
+
+      test::check_container(x, v);
+      test::check_equivalent_keys(x);
+    }
+#endif
   }
 
   template <class X>

test/unordered/rehash_tests.cpp

@@ -1,6 +1,7 @@
 
 // Copyright 2006-2009 Daniel James.
 // Copyright 2022-2023 Christian Mazakas.
+// Copyright 2026 Joaquin M Lopez Munoz.
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -587,6 +588,102 @@ namespace rehash_tests {
     }
   }
 
+  // White-box tests for https://github.com/boostorg/unordered/pull/348
+
+  struct failing_allocator_exception { std::size_t n; };
+
+  template<typename T>
+  struct failing_allocator
+  {
+    using value_type = T;
+
+    failing_allocator() = default;
+    template<typename U> failing_allocator(const failing_allocator<U>&) {}
+
+    T* allocate(std::size_t n) { throw failing_allocator_exception{n}; }
+    void deallocate(T*, std::size_t) { }
+
+    bool operator==(const failing_allocator&) const { return true; }
+    bool operator!=(const failing_allocator&) const { return false; }
+  };
+
+  using test_gh348_table = typename boost::unordered::detail::set<
+    failing_allocator<int>, int, boost::hash<int>, std::equal_to<int>>::table;
+  static std::size_t test_gh348_table_bucket_count = 0;
+
+} // namespace rehash_tests
+
+namespace boost {
+namespace unordered {
+namespace detail {
+
+  template<> 
+  auto ::rehash_tests::test_gh348_table::bucket_count() const ->
+    ::rehash_tests::test_gh348_table::size_type
+  {
+    return ::rehash_tests::test_gh348_table_bucket_count;
+  }
+
+} // namespace detail
+} // namespace unordered
+} // namespace boost
+
+namespace rehash_tests {
+
+  void test_gh348_1(int /* dummy for UNORDERED_TEST */)
+  {
+    using primes = boost::unordered::detail::prime_fmod_size<>;
+    const auto size_t_max = (std::numeric_limits<std::size_t>::max)();
+
+    for(double mlf = 0.1; mlf < 10.0; mlf += 0.1) {
+      for(std::size_t i = 0; i < primes::sizes_len; ++i) {
+        test_gh348_table t;
+        t.mlf_ = (float)mlf;
+        test_gh348_table_bucket_count = 0;
+        auto bc = primes::sizes[i];
+        std::size_t n = boost::unordered::detail::double_to_size(
+          0.9 * static_cast<double>(t.mlf_) * static_cast<double>(bc));
+        if(n == size_t_max) continue;
+        try {
+          t.reserve(n);
+        }
+        catch(const failing_allocator_exception& e) {
+          test_gh348_table_bucket_count = e.n;
+          BOOST_TEST_LE(bc, test_gh348_table_bucket_count);
+        }
+        t.max_load_ = boost::unordered::detail::double_to_size(
+          static_cast<double>(t.mlf_) * 
+          static_cast<double>(test_gh348_table_bucket_count));
+        if(t.max_load_ == size_t_max) continue;
+        try {
+          t.reserve_for_insert(t.max_load_ + 1);
+        }
+        catch(const failing_allocator_exception& e) {
+          if(i == primes::sizes_len - 1) {
+            BOOST_TEST_EQ(test_gh348_table_bucket_count, e.n);
+          }
+          else{
+            BOOST_TEST_LT(test_gh348_table_bucket_count, e.n);
+          }
+        }
+      }
+    }
+  }
+
+  void test_gh348_2(int /* dummy for UNORDERED_TEST */)
+  {
+    for(double mlf = 0.1; mlf < 2.0; mlf += 0.1) {
+      test_gh348_table t;
+      t.mlf_ = (float)mlf;
+      try {
+        t.reserve((std::numeric_limits<std::size_t>::max)());
+      }
+      catch(const failing_allocator_exception& e) {
+        BOOST_TEST_GT(e.n, 1000u);
+      }
+    }
+  }
+
   using test::default_generator;
   using test::generate_collisions;
   using test::limited_range;
@@ -739,6 +836,8 @@ namespace rehash_tests {
      (test_multiset_ptr)(int_multimap_ptr)
      (test_multiset_tracking)(test_multimap_tracking))(
       (default_generator)(generate_collisions)(limited_range)))
+  UNORDERED_TEST(test_gh348_1, ((0)))
+  UNORDERED_TEST(test_gh348_2, ((0)))
 // clang-format on
 #endif
 } // namespace rehash_tests

test/unordered/transparent_tests.cpp

@@ -1205,7 +1205,7 @@ template <class UnorderedMap> void test_map_non_transparent_erase(UnorderedMap*)
   BOOST_TEST_EQ(key::count_, key_count);
 }
 
-#if BOOST_UNORDERED_FOA_TESTS
+#ifdef BOOST_UNORDERED_FOA_TESTS
 typedef boost::unordered_flat_set<int, transparent_hasher,
   transparent_key_equal>
   transparent_unordered_set;
@@ -1689,14 +1689,14 @@ template <class UnorderedMap> void test_map_transparent_at(UnorderedMap*)
   map.at(0) = 7331;
   BOOST_TEST_EQ(key::count_, key_count);
 
-  BOOST_TEST_THROWS(map.at(4), std::out_of_range)
+  BOOST_TEST_THROWS(map.at(4), std::out_of_range);
   BOOST_TEST_EQ(key::count_, key_count);
 
   UnorderedMap const& m = map;
   BOOST_TEST_EQ(m.at(0), 7331);
   BOOST_TEST_EQ(key::count_, key_count);
 
-  BOOST_TEST_THROWS(m.at(4), std::out_of_range)
+  BOOST_TEST_THROWS(m.at(4), std::out_of_range);
   BOOST_TEST_EQ(key::count_, key_count);
 }
 
@@ -1719,7 +1719,7 @@ template <class UnorderedMap> void test_map_non_transparent_at(UnorderedMap*)
   BOOST_TEST_EQ(key::count_, key_count + 1);
 
   key_count = key::count_;
-  BOOST_TEST_THROWS(map.at(4), std::out_of_range)
+  BOOST_TEST_THROWS(map.at(4), std::out_of_range);
   BOOST_TEST_EQ(key::count_, key_count + 1);
 
   key_count = key::count_;
@@ -1728,7 +1728,7 @@ template <class UnorderedMap> void test_map_non_transparent_at(UnorderedMap*)
   BOOST_TEST_EQ(key::count_, key_count + 1);
 
   key_count = key::count_;
-  BOOST_TEST_THROWS(m.at(4), std::out_of_range)
+  BOOST_TEST_THROWS(m.at(4), std::out_of_range);
   BOOST_TEST_EQ(key::count_, key_count + 1);
 }