Add a std::formatter specialization for core::string_view. Fixes #190.

This reduces the likelihood of spurious CI failures caused by DDoS filters
being triggered by massive numbers of concurrent CI jobs.

.drone.jsonnet

@@ -32,6 +32,8 @@ local linux_pipeline(name, image, environment, packages = "", sources = [], arch
             commands:
             [
                 'set -e',
+                'uname -a',
+                'echo $DRONE_STAGE_MACHINE',
                 'wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -',
             ] +
             (if sources != [] then [ ('apt-add-repository "' + source + '"') for source in sources ] else []) +
@@ -97,41 +99,40 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
 
 [
     linux_pipeline(
-        "Linux 14.04 GCC 4.4",
-        "cppalliance/droneubuntu1404:1",
+        "Linux 16.04 GCC 4.4",
+        "cppalliance/droneubuntu1604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.4', CXXSTD: '98,0x' },
         "g++-4.4",
         [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
-        "Linux 14.04 GCC 4.6 32/64",
-        "cppalliance/droneubuntu1404:1",
+        "Linux 16.04 GCC 4.6 32/64",
+        "cppalliance/droneubuntu1604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.6', CXXSTD: '98,0x', ADDRMD: '32,64' },
         "g++-4.6-multilib",
         [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
-        "Linux 14.04 GCC 4.7 32/64",
-        "cppalliance/droneubuntu1404:1",
+        "Linux 16.04 GCC 4.7 32/64",
+        "cppalliance/droneubuntu1604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.7', CXXSTD: '98,0x', ADDRMD: '32,64' },
         "g++-4.7-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
-        "Linux 14.04 GCC 4.8* 32/64",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11', ADDRMD: '32,64' },
+        "Linux 16.04 GCC 4.8 32/64",
+        "cppalliance/droneubuntu1604:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-4.8', CXXSTD: '03,11', ADDRMD: '32,64' },
+        "g++-4.8-multilib",
     ),
 
     linux_pipeline(
-        "Linux 14.04 GCC 4.9 32/64",
-        "cppalliance/droneubuntu1404:1",
+        "Linux 16.04 GCC 4.9 32/64",
+        "cppalliance/droneubuntu1604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '03,11', ADDRMD: '32,64' },
         "g++-4.9-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
@@ -194,17 +195,44 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 GCC 12 32 ASAN",
+        "Linux 22.04 GCC 12 32/64",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32' } + asan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32,64' },
         "g++-12-multilib",
     ),
 
     linux_pipeline(
-        "Linux 22.04 GCC 12 64 ASAN",
-        "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '64' } + asan,
-        "g++-12-multilib",
+        "Linux 24.04 GCC 13* 32/64",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32,64' },
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 GCC 14 32 ASAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32' } + asan,
+        "g++-14-multilib",
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 GCC 14 64 ASAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '64' } + asan,
+        "g++-14-multilib",
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 GCC 14 32 UBSAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32' } + ubsan,
+        "g++-14-multilib",
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 GCC 14 64 UBSAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '64' } + ubsan,
+        "g++-14-multilib",
     ),
 
     linux_pipeline(
@@ -313,16 +341,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 Clang 14 UBSAN",
+        "Linux 22.04 Clang 14",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
-        "clang-14",
-    ),
-
-    linux_pipeline(
-        "Linux 22.04 Clang 14 ASAN",
-        "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14,17,20,2b' },
         "clang-14",
     ),
 
@@ -331,15 +352,41 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         "cppalliance/droneubuntu2204:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-15', CXXSTD: '03,11,14,17,20,2b' },
         "clang-15",
-        ["deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main"],
     ),
 
     linux_pipeline(
-        "Linux 22.04 Clang 16",
-        "cppalliance/droneubuntu2204:1",
+        "Linux 24.04 Clang 16",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-16', CXXSTD: '03,11,14,17,20,2b' },
         "clang-16",
-        ["deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main"],
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 Clang 17",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '03,11,14,17,20,2b' },
+        "clang-17",
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 Clang 18 UBSAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
+        "clang-18",
+    ),
+
+    linux_pipeline(
+        "Linux 24.04 Clang 18 ASAN",
+        "cppalliance/droneubuntu2404:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        "clang-18",
+    ),
+
+    linux_pipeline(
+        "Linux 24.10 Clang 19",
+        "cppalliance/droneubuntu2410:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-19', CXXSTD: '03,11,14,17,20,2b' },
+        "clang-19",
     ),
 
     macos_pipeline(
@@ -367,7 +414,7 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     windows_pipeline(
         "Windows VS2015 msvc-14.0",
         "cppalliance/dronevs2015",
-        { TOOLSET: 'msvc-14.0', CXXSTD: '14,latest', ADDRMD: '32,64' },
+        { TOOLSET: 'msvc-14.0', CXXSTD: '14,latest', B2_DONT_EMBED_MANIFEST: '1' },
     ),
 
     windows_pipeline(

.github/workflows/ci.yml

@@ -1,5 +1,5 @@
 # Copyright 2020-2021 Peter Dimov
-# Copyright 2021-2022 Andrey Semashev
+# Copyright 2021-2025 Andrey Semashev
 #
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
@@ -100,13 +100,13 @@ jobs:
           - toolset: gcc-9
             cxxstd: "03,11,14,17,2a"
             address-model: 32,64
-            os: ubuntu-20.04
+            os: ubuntu-24.04
             install:
               - g++-9-multilib
           - toolset: gcc-10
             cxxstd: "03,11,14,17,20"
             address-model: 32,64
-            os: ubuntu-20.04
+            os: ubuntu-24.04
             install:
               - g++-10-multilib
           - toolset: gcc-11
@@ -125,9 +125,23 @@ jobs:
             cxxstd: "03,11,14,17,20,23"
             address-model: 32,64
             os: ubuntu-latest
-            container: ubuntu:23.04
+            container: ubuntu:24.04
             install:
               - g++-13-multilib
+          - toolset: gcc-14
+            cxxstd: "03,11,14,17,20,23"
+            address-model: 32,64
+            os: ubuntu-latest
+            container: ubuntu:24.04
+            install:
+              - g++-14-multilib
+          - toolset: gcc-15
+            cxxstd: "03,11,14,17,20,23,2c"
+            address-model: 32,64
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - g++-15-multilib
           - name: UBSAN
             toolset: gcc-12
             cxxstd: "03,11,14,17,20,23"
@@ -213,13 +227,15 @@ jobs:
           - toolset: clang
             compiler: clang++-9
             cxxstd: "03,11,14,17,2a"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-9
           - toolset: clang
             compiler: clang++-10
             cxxstd: "03,11,14,17,20"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-10
           - toolset: clang
@@ -276,7 +292,7 @@ jobs:
             compiler: clang++-16
             cxxstd: "03,11,14,17,20,2b"
             os: ubuntu-latest
-            container: ubuntu:23.04
+            container: ubuntu:24.04
             install:
               - clang-16
               - libc++-16-dev
@@ -286,15 +302,45 @@ jobs:
           - toolset: clang
             compiler: clang++-17
             cxxstd: "03,11,14,17,20,2b"
-            os: ubuntu-22.04
+            os: ubuntu-latest
+            container: ubuntu:24.04
             install:
               - clang-17
               - libc++-17-dev
               - libc++abi-17-dev
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+          - toolset: clang
+            compiler: clang++-18
+            cxxstd: "03,11,14,17,20,2b"
+            os: ubuntu-latest
+            container: ubuntu:24.04
+            install:
+              - clang-18
+              - libc++-18-dev
+              - libc++abi-18-dev
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+          - toolset: clang
+            compiler: clang++-19
+            cxxstd: "03,11,14,17,20,2b"
+            os: ubuntu-latest
+            container: ubuntu:24.04
+            install:
+              - clang-19
+              - libc++-19-dev
+              - libc++abi-19-dev
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "03,11,14,17,20,2b,2c"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - clang-20
+              - libc++-20-dev
+              - libc++abi-20-dev
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
           - name: UBSAN
@@ -310,17 +356,25 @@ jobs:
               - libc++-15-dev
               - libc++abi-15-dev
 
-          - toolset: clang
-            cxxstd: "03,11,14,17,2a"
-            os: macos-11
-          - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
-            os: macos-12
+          - name: ARM
+            toolset: gcc-13
+            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04-arm
+            container: ubuntu:24.04
+            install:
+              - g++-13
+
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-13
+          - toolset: clang
+            cxxstd: "03,11,14,17,20,2b"
+            os: macos-14
+          - toolset: clang
+            cxxstd: "03,11,14,17,20,2b"
+            os: macos-15
 
-    timeout-minutes: 120
+    timeout-minutes: 45
     runs-on: ${{matrix.os}}
     container: ${{matrix.container}}
 
@@ -337,6 +391,22 @@ jobs:
                 echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
                 if [ -f "/etc/debian_version" ]
                 then
+                    # Use Azure APT mirrors in containers to avoid HTTP errors due to DDoS filters triggered by lots of CI jobs launching concurrently.
+                    # Note that not all Ubuntu versions support "mirror+file:..." URIs in APT sources, so just use Azure mirrors exclusively.
+                    # Note also that on recent Ubuntu versions DEB822 format is used for source files.
+                    APT_SOURCES=()
+                    if [ -d "/etc/apt/sources.list.d" ]
+                    then
+                        readarray -t APT_SOURCES < <(find "/etc/apt/sources.list.d" -type f -name '*.sources' -print)
+                    fi
+                    if [ -f "/etc/apt/sources.list" ]
+                    then
+                        APT_SOURCES+=("/etc/apt/sources.list")
+                    fi
+                    if [ "${#APT_SOURCES[@]}" -gt 0 ]
+                    then
+                        sed -i -E -e 's!([^ ]+) (http|https)://(archive|security)\.ubuntu\.com/ubuntu[^ ]*(.*)!\1 http://azure.archive.ubuntu.com/ubuntu/\4!' "${APT_SOURCES[@]}"
+                    fi
                     apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
                     if [ "$(apt-cache search "^python-is-python3$" | wc -l)" -ne 0 ]
                     then
@@ -349,8 +419,6 @@ jobs:
             fi
             git config --global pack.threads 0
 
-      - uses: actions/checkout@v3
-
       - name: Install packages
         if: matrix.install
         run: |
@@ -465,11 +533,25 @@ jobs:
             then
                 DEPINST_ARGS+=("--git_args" "--jobs $GIT_FETCH_JOBS")
             fi
+            mkdir -p snapshot
+            cd snapshot
+            echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+            if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+            then
+                echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+                ls -la
+                exit 1
+            fi
+            rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
             cd ..
             git clone -b "$BOOST_BRANCH" --depth 1 "https://github.com/boostorg/boost.git" "boost-root"
             cd boost-root
-            mkdir -p libs/$LIBRARY
-            cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+            mkdir -p libs
+            rm -rf "libs/$LIBRARY"
+            mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+            rm -rf "../snapshot"
             git submodule update --init tools/boostdep
             DEPINST_ARGS+=("$LIBRARY")
             python tools/boostdep/depinst/depinst.py "${DEPINST_ARGS[@]}"
@@ -488,7 +570,7 @@ jobs:
       - name: Run tests
         if: matrix.cmake_tests == ''
         run: |
-            cd ../boost-root
+            cd boost-root
             B2_ARGS=("-j" "$BUILD_JOBS" "toolset=${{matrix.toolset}}" "cxxstd=${{matrix.cxxstd}}")
             if [ -n "${{matrix.build_variant}}" ]
             then
@@ -525,14 +607,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.0
-            cxxstd: "14"
-            addrmd: 32,64
-            os: windows-2019
-          - toolset: msvc-14.2
-            cxxstd: "14,17,20,latest"
-            addrmd: 32,64
-            os: windows-2019
           - toolset: msvc-14.3
             cxxstd: "14,17,20,latest"
             addrmd: 32,64
@@ -544,13 +618,19 @@ jobs:
           - toolset: gcc
             cxxstd: "03,11,14,17,2a"
             addrmd: 64
-            os: windows-2019
+            os: windows-2022
+
+          # Windows SDK 32-bit ARM libs not installed in this image
+          - name: ARM
+            toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 64
+            os: windows-11-arm
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 45
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Setup Boost
         shell: cmd
         run: |
@@ -564,10 +644,24 @@ jobs:
             set BOOST_BRANCH=develop
             for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
             echo BOOST_BRANCH: %BOOST_BRANCH%
+            mkdir snapshot
+            cd snapshot
+            echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
+            curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
+            tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
+            if not exist "%LIBRARY%-%GITHUB_SHA%\" (
+                echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
+                dir
+                exit /b 1
+            )
+            del /f "%LIBRARY%-%GITHUB_SHA%.zip"
             cd ..
             git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
             cd boost-root
-            xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+            if not exist "libs\" mkdir libs
+            if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
+            move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
+            rmdir /s /q "..\snapshot"
             git submodule update --init tools/boostdep
             python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
             cmd /c bootstrap
@@ -576,7 +670,7 @@ jobs:
       - name: Run tests
         shell: cmd
         run: |
-            cd ../boost-root
+            cd boost-root
             b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release embed-manifest-via=linker
 
   posix-cmake-subdir:
@@ -584,20 +678,21 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
-          - os: macos-12
+          - os: ubuntu-24.04
           - os: macos-13
+          - os: macos-14
+          - os: macos-15
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Install packages
         if: matrix.install
-        run: sudo apt install ${{matrix.install}}
+        run: |
+          sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+          sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT -y ${{join(matrix.install, ' ')}}
 
       - name: Setup Boost
         run: |
@@ -612,16 +707,34 @@ jobs:
           echo REF: $REF
           BOOST_BRANCH=develop && [ "$REF" = "master" ] && BOOST_BRANCH=master || true
           echo BOOST_BRANCH: $BOOST_BRANCH
+          BUILD_JOBS=$((nproc || sysctl -n hw.ncpu) 2> /dev/null)
+          echo "BUILD_JOBS=$BUILD_JOBS" >> $GITHUB_ENV
+          echo "CMAKE_BUILD_PARALLEL_LEVEL=$BUILD_JOBS" >> $GITHUB_ENV
+          mkdir -p snapshot
+          cd snapshot
+          echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+          if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+          then
+              echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+              ls -la
+              exit 1
+          fi
+          rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
           cd ..
           git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          mkdir -p libs
+          rm -rf "libs/$LIBRARY"
+          mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+          rm -rf "../snapshot"
           git submodule update --init tools/boostdep
           python tools/boostdep/depinst/depinst.py --git_args "--jobs $GIT_FETCH_JOBS" $LIBRARY
 
       - name: Use library with add_subdirectory
         run: |
-          cd ../boost-root/libs/$LIBRARY/test/cmake_subdir_test
+          cd boost-root/libs/$LIBRARY/test/cmake_subdir_test
           mkdir __build__ && cd __build__
           cmake ..
           cmake --build . -- -j $BUILD_JOBS
@@ -632,20 +745,21 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
-          - os: macos-12
+          - os: ubuntu-24.04
           - os: macos-13
+          - os: macos-14
+          - os: macos-15
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Install packages
         if: matrix.install
-        run: sudo apt install ${{matrix.install}}
+        run: |
+          sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+          sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT -y ${{join(matrix.install, ' ')}}
 
       - name: Setup Boost
         run: |
@@ -660,27 +774,45 @@ jobs:
           echo REF: $REF
           BOOST_BRANCH=develop && [ "$REF" = "master" ] && BOOST_BRANCH=master || true
           echo BOOST_BRANCH: $BOOST_BRANCH
+          BUILD_JOBS=$((nproc || sysctl -n hw.ncpu) 2> /dev/null)
+          echo "BUILD_JOBS=$BUILD_JOBS" >> $GITHUB_ENV
+          echo "CMAKE_BUILD_PARALLEL_LEVEL=$BUILD_JOBS" >> $GITHUB_ENV
+          mkdir -p snapshot
+          cd snapshot
+          echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+          if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+          then
+              echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+              ls -la
+              exit 1
+          fi
+          rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
           cd ..
           git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          mkdir -p libs
+          rm -rf "libs/$LIBRARY"
+          mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+          rm -rf "../snapshot"
           git submodule update --init tools/boostdep
           python tools/boostdep/depinst/depinst.py --git_args "--jobs $GIT_FETCH_JOBS" $LIBRARY
 
       - name: Configure
         run: |
-          cd ../boost-root
+          cd boost-root
           mkdir __build__ && cd __build__
           cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DCMAKE_INSTALL_PREFIX=~/.local ..
 
       - name: Install
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target install -- -j $BUILD_JOBS
 
       - name: Use the installed library
         run: |
-          cd ../boost-root/libs/$LIBRARY/test/cmake_install_test && mkdir __build__ && cd __build__
+          cd boost-root/libs/$LIBRARY/test/cmake_install_test && mkdir __build__ && cd __build__
           cmake -DCMAKE_INSTALL_PREFIX=~/.local ..
           cmake --build . -- -j $BUILD_JOBS
           ctest --output-on-failure --no-tests=error
@@ -690,20 +822,25 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
-          - os: macos-12
+          - os: ubuntu-24.04
           - os: macos-13
+          - os: macos-14
+          - os: macos-15
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 20
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Install packages
-        if: matrix.install
-        run: sudo apt install ${{matrix.install}}
+        run: |
+          if [ -f "/etc/debian_version" ]
+          then
+              sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+              sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y ninja-build ${{join(matrix.install, ' ')}}
+          else
+              brew install ninja ${{join(matrix.install, ' ')}}
+          fi
 
       - name: Setup Boost
         run: |
@@ -718,27 +855,47 @@ jobs:
           echo REF: $REF
           BOOST_BRANCH=develop && [ "$REF" = "master" ] && BOOST_BRANCH=master || true
           echo BOOST_BRANCH: $BOOST_BRANCH
+          BUILD_JOBS=$((nproc || sysctl -n hw.ncpu) 2> /dev/null)
+          echo BUILD_JOBS: $BUILD_JOBS
+          echo "BUILD_JOBS=$BUILD_JOBS" >> $GITHUB_ENV
+          echo "CMAKE_BUILD_PARALLEL_LEVEL=$BUILD_JOBS" >> $GITHUB_ENV
+          mkdir -p snapshot
+          cd snapshot
+          echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+          tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+          if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+          then
+              echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+              ls -la
+              exit 1
+          fi
+          rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
           cd ..
           git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          mkdir -p libs
+          rm -rf "libs/$LIBRARY"
+          mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+          rm -rf "../snapshot"
           git submodule update --init tools/boostdep
           python tools/boostdep/depinst/depinst.py --git_args "--jobs $GIT_FETCH_JOBS" $LIBRARY
 
       - name: Configure
         run: |
-          cd ../boost-root
+          cd boost-root
           mkdir __build__ && cd __build__
-          cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DBUILD_TESTING=ON ..
+          # Building tests on Mac OS using makefiles sometimes blocks until timeout, if multiple parallel build jobs are used. Use Ninja instead.
+          cmake -G Ninja -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DBUILD_TESTING=ON ..
 
       - name: Build tests
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target tests -- -j $BUILD_JOBS
 
       - name: Run tests
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           ctest --output-on-failure --no-tests=error
 
   windows-cmake-subdir:
@@ -746,14 +903,13 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
           - os: windows-2022
+          - os: windows-2025
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Setup Boost
         shell: cmd
         run: |
@@ -767,17 +923,31 @@ jobs:
           set BOOST_BRANCH=develop
           for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
           echo BOOST_BRANCH: %BOOST_BRANCH%
+          mkdir snapshot
+          cd snapshot
+          echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
+          curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
+          tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
+          if not exist "%LIBRARY%-%GITHUB_SHA%\" (
+              echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
+              dir
+              exit /b 1
+          )
+          del /f "%LIBRARY%-%GITHUB_SHA%.zip"
           cd ..
           git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+          if not exist "libs\" mkdir libs
+          if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
+          move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
+          rmdir /s /q "..\snapshot"
           git submodule update --init tools/boostdep
-          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" %LIBRARY%
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
 
       - name: Use library with add_subdirectory (Debug)
         shell: cmd
         run: |
-          cd ../boost-root/libs/%LIBRARY%/test/cmake_subdir_test
+          cd boost-root/libs/%LIBRARY%/test/cmake_subdir_test
           mkdir __build__ && cd __build__
           cmake ..
           cmake --build . --config Debug
@@ -786,7 +956,7 @@ jobs:
       - name: Use library with add_subdirectory (Release)
         shell: cmd
         run: |
-          cd ../boost-root/libs/%LIBRARY%/test/cmake_subdir_test/__build__
+          cd boost-root/libs/%LIBRARY%/test/cmake_subdir_test/__build__
           cmake --build . --config Release
           ctest --output-on-failure --no-tests=error -C Release
 
@@ -795,14 +965,13 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
           - os: windows-2022
+          - os: windows-2025
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Setup Boost
         shell: cmd
         run: |
@@ -816,36 +985,50 @@ jobs:
           set BOOST_BRANCH=develop
           for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
           echo BOOST_BRANCH: %BOOST_BRANCH%
+          mkdir snapshot
+          cd snapshot
+          echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
+          curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
+          tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
+          if not exist "%LIBRARY%-%GITHUB_SHA%\" (
+              echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
+              dir
+              exit /b 1
+          )
+          del /f "%LIBRARY%-%GITHUB_SHA%.zip"
           cd ..
           git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+          if not exist "libs\" mkdir libs
+          if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
+          move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
+          rmdir /s /q "..\snapshot"
           git submodule update --init tools/boostdep
-          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" %LIBRARY%
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
 
       - name: Configure
         shell: cmd
         run: |
-          cd ../boost-root
+          cd boost-root
           mkdir __build__ && cd __build__
           cmake -DBOOST_INCLUDE_LIBRARIES=%LIBRARY% -DCMAKE_INSTALL_PREFIX=C:/cmake-prefix ..
 
       - name: Install (Debug)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target install --config Debug
 
       - name: Install (Release)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target install --config Release
 
       - name: Use the installed library (Debug)
         shell: cmd
         run: |
-          cd ../boost-root/libs/%LIBRARY%/test/cmake_install_test && mkdir __build__ && cd __build__
+          cd boost-root/libs/%LIBRARY%/test/cmake_install_test && mkdir __build__ && cd __build__
           cmake -DCMAKE_INSTALL_PREFIX=C:/cmake-prefix ..
           cmake --build . --config Debug
           ctest --output-on-failure --no-tests=error -C Debug
@@ -853,7 +1036,7 @@ jobs:
       - name: Use the installed library (Release)
         shell: cmd
         run: |
-          cd ../boost-root/libs/%LIBRARY%/test/cmake_install_test/__build__
+          cd boost-root/libs/%LIBRARY%/test/cmake_install_test/__build__
           cmake --build . --config Release
           ctest --output-on-failure --no-tests=error -C Release
 
@@ -862,14 +1045,13 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
           - os: windows-2022
+          - os: windows-2025
 
     runs-on: ${{matrix.os}}
+    timeout-minutes: 20
 
     steps:
-      - uses: actions/checkout@v3
-
       - name: Setup Boost
         shell: cmd
         run: |
@@ -883,40 +1065,54 @@ jobs:
           set BOOST_BRANCH=develop
           for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
           echo BOOST_BRANCH: %BOOST_BRANCH%
+          mkdir snapshot
+          cd snapshot
+          echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
+          curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
+          tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
+          if not exist "%LIBRARY%-%GITHUB_SHA%\" (
+              echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
+              dir
+              exit /b 1
+          )
+          del /f "%LIBRARY%-%GITHUB_SHA%.zip"
           cd ..
           git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
           cd boost-root
-          xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+          if not exist "libs\" mkdir libs
+          if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
+          move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
+          rmdir /s /q "..\snapshot"
           git submodule update --init tools/boostdep
-          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" %LIBRARY%
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
 
       - name: Configure
         shell: cmd
         run: |
-          cd ../boost-root
+          cd boost-root
           mkdir __build__ && cd __build__
           cmake -DBOOST_INCLUDE_LIBRARIES=%LIBRARY% -DBUILD_TESTING=ON ..
 
       - name: Build tests (Debug)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target tests --config Debug
 
       - name: Run tests (Debug)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           ctest --output-on-failure --no-tests=error -C Debug
 
       - name: Build tests (Release)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           cmake --build . --target tests --config Release
 
       - name: Run tests (Release)
         shell: cmd
         run: |
-          cd ../boost-root/__build__
+          cd boost-root/__build__
           ctest --output-on-failure --no-tests=error -C Release

build.jam

@@ -0,0 +1,23 @@
+# Copyright 2023-2024 René Ferdinand Rivera Morell
+# Copyright 2024 Peter Dimov
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/assert//boost_assert
+    /boost/config//boost_config
+    /boost/static_assert//boost_static_assert
+    /boost/throw_exception//boost_throw_exception
+    ;
+
+project /boost/core ;
+
+explicit
+    [ alias boost_core : : : : <include>include <library>$(boost_dependencies) ]
+    [ alias all : boost_core test ]
+    ;
+
+call-if : boost-library core
+    ;

doc/Jamfile.v2

@@ -9,7 +9,7 @@ import project ;
 import doxygen ;
 import quickbook ;
 
-path-constant INCLUDES : ../../.. ;
+path-constant INCLUDES : ../include ;
 
 doxygen ref_reference
   :

doc/changes.qbk

@@ -1,12 +1,40 @@
 [/
   Copyright 2021 Peter Dimov
-  Copyright 2022-2023 Andrey Semashev
+  Copyright 2022-2024 Andrey Semashev
   Distributed under the Boost Software License, Version 1.0.
   https://boost.org/LICENSE_1_0.txt)
 ]
 
 [section Revision History]
 
+[section Changes in 1.86.0]
+
+* Added a [link core.pointer_in_range `boost/core/pointer_in_range.hpp`] header with a `pointer_in_range`
+  function template to check if a pointer is within a given range.
+* Fixed `type_name` for abstract classes. ([github_issue 172])
+* Fixed `boost/core/type_name.hpp` compilation error with MSVC with disabled native `wchar_t` type.
+  ([github_issue 173])
+* Added a workaround for an MSVC [@https://developercommunity.visualstudio.com/t/Compiler-bug:-Incorrect-C2247-and-C2248/10690025 bug]
+  causing `empty_value` compilation errors when it is used with a nested class. ([github_pr 175])
+
+[endsect]
+
+[section Changes in 1.85.0]
+
+* Added a new [link core.functor `boost/core/functor.hpp`] header with a `functor` class template
+  for wrapping a raw function into a function object class.
+* Changed [link core.null_deleter `null_deleter`], [link core.fclose_deleter `fclose_deleter`]
+  and [link core.checked_delete checked deleter] definitions so that they don't bring namespace `boost`
+  into argument-dependent lookup in cases like this:
+  ```
+  std::unique_ptr< std::FILE, boost::fclose_deleter > p1, p2;
+  swap(p1, p2); // no longer looks for boost::swap as part of ADL
+  ```
+  Users may need to either explicitly qualify the namespace of the called function or add a
+  `using`-declaration.
+
+[endsect]
+
 [section Changes in 1.84.0]
 
 * `boost::swap` utility function has been renamed to `boost::core::invoke_swap` to

doc/core.qbk

@@ -20,6 +20,9 @@ or copy at http://boost.org/LICENSE_1_0.txt)
   ]
 ]
 
+[template github_issue[key]'''<ulink url="https://github.com/boostorg/core/issues/'''[key]'''">#'''[key]'''</ulink>''']
+[template github_pr[key]'''<ulink url="https://github.com/boostorg/core/pull/'''[key]'''">PR#'''[key]'''</ulink>''']
+
 [template simplesect[title]
 [block '''<simplesect><title>'''[title]'''</title>''']]
 
@@ -55,6 +58,7 @@ criteria for inclusion is that the utility component be:
 [include exchange.qbk]
 [include explicit_operator_bool.qbk]
 [include first_scalar.qbk]
+[include functor.qbk]
 [include identity.qbk]
 [include ignore_unused.qbk]
 [include is_same.qbk]
@@ -69,6 +73,7 @@ criteria for inclusion is that the utility component be:
 [include null_deleter.qbk]
 [include fclose_deleter.qbk]
 [include nvp.qbk]
+[include pointer_in_range.qbk]
 [include pointer_traits.qbk]
 [include quick_exit.qbk]
 [include ref.qbk]

doc/functor.qbk

@@ -0,0 +1,101 @@
+[/
+ / Copyright (c) 2024 Andrey Semashev
+ /
+ / 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)
+ /]
+
+[section:functor functor]
+
+[simplesect Authors]
+
+* Andrey Semashev
+
+[endsimplesect]
+
+[section Header <boost/core/functor.hpp>]
+
+[note This component requires a compiler supporting C++17 or newer.]
+
+The header `<boost/core/functor.hpp>` defines the `boost::core::functor` class template
+that wraps a raw function specified in its template parameter into a function object class.
+The function object forwards any arguments passed to it to the wrapped function and returns
+the result of the call.
+
+The `functor` wrapper can be useful in cases when a function object class type is required,
+for example, for use with smart pointers such as `std::unique_ptr`, where the actual logic
+of the function object is already implemented as a raw function, possibly provided by a
+third party library. Since `functor` is default-constructible and does not store a pointer
+to the wrapped function internally, using `functor` is less error-prone and more efficient
+than using the pointer to function instead. For example, with `std::unique_ptr` you don't
+need to pass a pointer to the deleter function in the `std::unique_ptr` constructor, and
+the `std::unique_ptr` object does not store and invoke a pointer to the deleter function.
+With `functor`, the deleter function becomes part of the `std::unique_ptr` type, which
+prevents mixing pointers with incompatible deleters.
+
+```
+void my_deleter(void* p);
+
+using malloc_ptr = std::unique_ptr< char, boost::core::functor< std::free > >;
+using my_ptr = std::unique_ptr< char, boost::core::functor< my_deleter > >;
+
+my_ptr create_string(std::size_t size);
+void consume_string(my_ptr&& str);
+
+malloc_ptr ptr1(static_cast< char* >(std::malloc(size)));
+// ptr1 = allocate_string(size); // error, cannot convert my_ptr to malloc_ptr
+my_ptr ptr2 = create_string(size); // ok
+
+// consume_string(std::move(ptr1)); // error, cannot convert malloc_ptr&& to my_ptr
+consume_string(std::move(ptr2)); // ok
+```
+
+Using `functor` may also be beneficial for reducing generated code sizes. For example, in
+order to avoid storing and invoking a pointer to the deleter function in `std::shared_ptr`,
+one may be inclined to use lambda functions to wrap the deleter function call like this:
+
+```
+std::shared_ptr< int > ptr(static_cast< int* >(std::malloc(sizeof(int))), [](int* p) { std::free(p); });
+```
+
+The problem is that every lambda function declaration introduces a unique type, even if
+the lambda function definition matches exactly one of the previously declared lambda
+functions. Thus, if `std::shared_ptr` objects like the one above are created in multiple
+places in the program, the definition of the shared pointer counter and associated code
+and data (e.g. virtual function table) will be duplicated for each instance.
+
+Replacing the lambda function with `functor` solves this problem without sacrificing
+readability or efficiency:
+
+```
+std::shared_ptr< int > ptr(static_cast< int* >(std::malloc(sizeof(int))), boost::core::functor< std::free >());
+```
+
+[section Synopsis]
+
+```
+namespace boost::core {
+
+template< auto Function >
+struct functor
+{
+    template< typename... Args >
+    decltype(auto) operator() (Args&&... args) const noexcept(...);
+};
+
+} // namespace boost::core
+```
+
+[endsect]
+
+[section `template< typename... Args > decltype(auto) operator() (Args&&... args) const noexcept(...);`]
+
+* *Effects:* `return Function(std::forward< Args >(args)...)`.
+* *Throws:* Nothing, unless invoking `Function` throws.
+* *Note:* This function only participates in overload resolution if `Function(std::forward< Args >(args)...)` is a valid call expression.
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/pointer_in_range.qbk

@@ -0,0 +1,81 @@
+[/
+Copyright 2024 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:pointer_in_range pointer_in_range]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+The header <boost/core/pointer_in_range.hpp> provides the function template
+`boost::pointer_in_range` to check if a pointer is in a given range. This
+can be used in constant expressions in C++14 or higher when the compiler has a
+builtin to support `std::is_constant_evaluated`.
+
+[endsect]
+
+[section Examples]
+
+The following is an example of an allocator's deallocation function that does
+nothing if the pointer falls within a small automatically allocated buffer.
+
+```
+template<class T, class N>
+void
+Allocator<T, N>::deallocate(pointer ptr, size_type)
+{
+    if (!boost::pointer_in_range(ptr, buffer_, buffer_ + N)) {
+        ::operator delete(ptr);
+    }
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class T>
+constexpr bool pointer_in_range(const T* ptr, const T* begin, const T* end);
+
+} /* boost */
+```
+
+[section Functions]
+
+[variablelist
+[[`template<class T> constexpr bool pointer_in_range(const T* ptr,
+const T* begin, const T* end);`]
+[[variablelist
+[[Requires][`[begin,end)` is a valid range.]]
+[[Returns][`true` if `ptr` is in range `[begin,end)`, otherwise `false`.]]]]]]
+
+[endsect]
+
+[endsect]
+
+[section Notes]
+
+If `boost::pointer_in_range` is not usable in constant expressions the macro
+`BOOST_CORE_NO_CONSTEXPR_POINTER_IN_RANGE` is defined.
+
+[endsect]
+
+[section History]
+
+Glen Fernandes implemented `pointer_in_range`.
+
+[endsect]
+
+[endsect]

doc/span.qbk

@@ -38,7 +38,7 @@ and return type use spans.
 
 ```
 auto sha1(boost::span<const unsigned char> input,
-    boost::span<unsigned char, SHA_DIGEST_LENGTH> ouput)
+    boost::span<unsigned char, SHA_DIGEST_LENGTH> output)
 {
     SHA_CTX context;
     SHA1_Init(&context);

include/boost/core/allocator_access.hpp

@@ -43,9 +43,17 @@ _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 #if defined(_STL_DISABLE_DEPRECATED_WARNING)
 _STL_DISABLE_DEPRECATED_WARNING
 #endif
-#if defined(_MSC_VER)
-#pragma warning(push)
-#pragma warning(disable:4996)
+#if defined(__clang__) && defined(__has_warning)
+# if __has_warning("-Wdeprecated-declarations")
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wdeprecated-declarations"
+# endif
+#elif defined(_MSC_VER)
+# pragma warning(push)
+# pragma warning(disable: 4996)
+#elif defined(BOOST_GCC) && BOOST_GCC >= 40600
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
 namespace boost {
@@ -807,9 +815,15 @@ using allocator_rebind_t = typename allocator_rebind<A, T>::type;
 
 } /* boost */
 
-#if defined(_MSC_VER)
-#pragma warning(pop)
-#endif
+#if defined(__clang__) && defined(__has_warning)
+# if __has_warning("-Wdeprecated-declarations")
+#  pragma clang diagnostic pop
+# endif
+#elif defined(_MSC_VER)
+# pragma warning(pop)
+#elif defined(BOOST_GCC) && BOOST_GCC >= 40600
+# pragma GCC diagnostic pop
+#endif  
 #if defined(_STL_RESTORE_DEPRECATED_WARNING)
 _STL_RESTORE_DEPRECATED_WARNING
 #endif

include/boost/core/bit.hpp

@@ -28,7 +28,7 @@
 # pragma intrinsic(_BitScanForward)
 # pragma intrinsic(_BitScanReverse)
 
-# if defined(_M_X64)
+# if defined(_M_X64) || defined(_M_ARM64)
 #  pragma intrinsic(_BitScanForward64)
 #  pragma intrinsic(_BitScanReverse64)
 # endif
@@ -47,12 +47,19 @@
 # if __has_builtin(__builtin_bit_cast)
 #  define BOOST_CORE_HAS_BUILTIN_BIT_CAST
 # endif
+# if __has_builtin(__builtin_bswap16)
+#  define BOOST_CORE_HAS_BUILTIN_BSWAP16
+# endif
 #endif
 
-#if defined(BOOST_MSVC) && BOOST_MSVC >= 1926
+#if !defined(BOOST_CORE_HAS_BUILTIN_BIT_CAST) && (defined(BOOST_MSVC) && BOOST_MSVC >= 1926)
 #  define BOOST_CORE_HAS_BUILTIN_BIT_CAST
 #endif
 
+#if !defined(BOOST_CORE_HAS_BUILTIN_BSWAP16) && (defined(BOOST_GCC) && BOOST_GCC >= 40800)
+#  define BOOST_CORE_HAS_BUILTIN_BSWAP16
+#endif
+
 namespace boost
 {
 namespace core
@@ -223,7 +230,7 @@ inline int countl_impl( boost::uint16_t x ) BOOST_NOEXCEPT
 
 #endif
 
-#if defined(_MSC_VER) && defined(_M_X64) && defined(BOOST_CORE_HAS_BUILTIN_ISCONSTEVAL)
+#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64)) && defined(BOOST_CORE_HAS_BUILTIN_ISCONSTEVAL)
 
 BOOST_CXX14_CONSTEXPR inline int countl_impl( boost::uint64_t x ) BOOST_NOEXCEPT
 {
@@ -248,7 +255,7 @@ BOOST_CXX14_CONSTEXPR inline int countl_impl( boost::uint64_t x ) BOOST_NOEXCEPT
     }
 }
 
-#elif defined(_MSC_VER) && defined(_M_X64)
+#elif defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64))
 
 inline int countl_impl( boost::uint64_t x ) BOOST_NOEXCEPT
 {
@@ -448,7 +455,7 @@ inline int countr_impl( boost::uint16_t x ) BOOST_NOEXCEPT
 
 #endif
 
-#if defined(_MSC_VER) && defined(_M_X64) && defined(BOOST_CORE_HAS_BUILTIN_ISCONSTEVAL)
+#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64)) && defined(BOOST_CORE_HAS_BUILTIN_ISCONSTEVAL)
 
 BOOST_CXX14_CONSTEXPR inline int countr_impl( boost::uint64_t x ) BOOST_NOEXCEPT
 {
@@ -473,7 +480,7 @@ BOOST_CXX14_CONSTEXPR inline int countr_impl( boost::uint64_t x ) BOOST_NOEXCEPT
     }
 }
 
-#elif defined(_MSC_VER) && defined(_M_X64)
+#elif defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64))
 
 inline int countr_impl( boost::uint64_t x ) BOOST_NOEXCEPT
 {
@@ -696,7 +703,7 @@ BOOST_CXX14_CONSTEXPR inline boost::uint32_t bit_ceil_impl( boost::uint32_t x )
 {
     if( x == 0 )
     {
-        return 0;
+        return 1;
     }
 
     --x;
@@ -716,7 +723,7 @@ BOOST_CXX14_CONSTEXPR inline boost::uint64_t bit_ceil_impl( boost::uint64_t x )
 {
     if( x == 0 )
     {
-        return 0;
+        return 1;
     }
 
     --x;
@@ -825,11 +832,22 @@ BOOST_CONSTEXPR inline boost::uint8_t byteswap_impl( boost::uint8_t x ) BOOST_NO
     return x;
 }
 
+#if defined(BOOST_CORE_HAS_BUILTIN_BSWAP16)
+
+BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_NOEXCEPT
+{
+    return __builtin_bswap16( x );
+}
+
+#else
+
 BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_NOEXCEPT
 {
     return static_cast<boost::uint16_t>( x << 8 | x >> 8 );
 }
 
+#endif
+
 #if defined(__GNUC__) || defined(__clang__)
 
 BOOST_CXX14_CONSTEXPR inline boost::uint32_t byteswap_impl( boost::uint32_t x ) BOOST_NOEXCEPT

include/boost/core/checked_delete.hpp

@@ -60,6 +60,10 @@ template<class T> inline void checked_array_delete(T * x) BOOST_NOEXCEPT
     delete [] x;
 }
 
+// Block unintended ADL
+namespace checked_deleters
+{
+
 template<class T> struct checked_deleter
 {
     typedef void result_type;
@@ -83,6 +87,11 @@ template<class T> struct checked_array_deleter
     }
 };
 
+} // namespace checked_deleters
+
+using checked_deleters::checked_deleter;
+using checked_deleters::checked_array_deleter;
+
 } // namespace boost
 
 #endif  // #ifndef BOOST_CORE_CHECKED_DELETE_HPP

include/boost/core/default_allocator.hpp

@@ -10,6 +10,7 @@ Distributed under the Boost Software License, Version 1.0.
 
 #include <boost/config.hpp>
 #include <new>
+#include <cstddef>
 
 namespace boost {
 

include/boost/core/demangle.hpp

@@ -30,7 +30,7 @@
 
 #if defined( BOOST_CORE_HAS_CXXABI_H )
 # include <cxxabi.h>
-// For some archtectures (mips, mips64, x86, x86_64) cxxabi.h in Android NDK is implemented by gabi++ library
+// For some architectures (mips, mips64, x86, x86_64) cxxabi.h in Android NDK is implemented by gabi++ library
 // (https://android.googlesource.com/platform/ndk/+/master/sources/cxx-stl/gabi++/), which does not implement
 // abi::__cxa_demangle(). We detect this implementation by checking the include guard here.
 # if defined( __GABIXX_CXXABI_H__ )

include/boost/core/detail/assert.hpp

@@ -0,0 +1,18 @@
+/*
+Copyright 2025 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#undef BOOST_CORE_DETAIL_ASSERT
+
+#if !defined(__clang__) && \
+    !defined(__INTEL_COMPILER) && \
+    defined(__GNUC__) && \
+    (__GNUC__ < 5)
+#define BOOST_CORE_DETAIL_ASSERT(expr) void(0)
+#else
+#include <boost/assert.hpp>
+#define BOOST_CORE_DETAIL_ASSERT(expr) BOOST_ASSERT(expr)
+#endif

include/boost/core/detail/minstd_rand.hpp

@@ -0,0 +1,58 @@
+#ifndef BOOST_CORE_DETAIL_MINSTD_RAND_HPP_INCLUDED
+#define BOOST_CORE_DETAIL_MINSTD_RAND_HPP_INCLUDED
+
+// Copyright 2017 Peter Dimov
+//
+// 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
+//
+// An implementation of minstd_rand that does not require
+// the Random library
+
+#include <boost/cstdint.hpp>
+
+namespace boost
+{
+namespace detail
+{
+
+class minstd_rand
+{
+private:
+
+    boost::uint_least32_t x_;
+
+    enum { a = 48271, m = 2147483647 };
+
+public:
+
+    minstd_rand(): x_( 1 )
+    {
+    }
+
+    explicit minstd_rand( boost::uint_least32_t x ): x_( x % m )
+    {
+        if( x_ == 0 )
+        {
+            x_ = 1;
+        }
+    }
+
+    boost::uint_least32_t operator()()
+    {
+        boost::uint_least64_t y = x_;
+
+        y = ( a * y ) % m;
+
+        x_ = static_cast<boost::uint_least32_t>( y );
+
+        return x_;
+    }
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_CORE_DETAIL_MINSTD_RAND_HPP_INCLUDED

include/boost/core/detail/sp_thread_sleep.hpp

@@ -67,7 +67,7 @@ namespace core
 
 inline void sp_thread_sleep() BOOST_NOEXCEPT
 {
-#if defined(BOOST_HAS_PTHREADS) && !defined(__ANDROID__)
+#if defined(BOOST_HAS_PTHREADS) && !defined(__ANDROID__) && !defined(__OHOS__)
 
     int oldst;
     pthread_setcancelstate( PTHREAD_CANCEL_DISABLE, &oldst );
@@ -85,7 +85,7 @@ inline void sp_thread_sleep() BOOST_NOEXCEPT
 
     nanosleep( &rqtp, 0 );
 
-#if defined(BOOST_HAS_PTHREADS) && !defined(__ANDROID__)
+#if defined(BOOST_HAS_PTHREADS) && !defined(__ANDROID__) && !defined(__OHOS__)
 
     pthread_setcancelstate( oldst, &oldst );
 

include/boost/core/detail/string_view.hpp

@@ -34,6 +34,9 @@
 #if !defined(BOOST_NO_CXX20_HDR_CONCEPTS) // std::common_reference_with
 # include <type_traits>
 #endif
+#if !defined(BOOST_NO_CXX20_HDR_FORMAT)
+# include <format> // std::formatter
+#endif
 
 namespace boost
 {
@@ -41,9 +44,6 @@ namespace boost
 // forward declaration of boost::basic_string_view from Utility
 template<class Ch, class Tr> class basic_string_view;
 
-// forward declaration of boost::hash_range from ContainerHash
-template<class It> std::size_t hash_range( It, It );
-
 namespace core
 {
 namespace detail
@@ -74,7 +74,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_of( Ch const* p_
 
     for( std::size_t j = 0; j < n; ++j )
     {
-        UCh ch = s[ j ];
+        UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
@@ -91,7 +91,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_of( Ch const* p_
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
-            UCh ch = p_[ i ];
+            UCh ch = static_cast<UCh>( p_[ i ] );
             if( ch >= 0 && ch < 256 && table[ ch ] ) return i;
         }
     }
@@ -129,7 +129,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_of( Ch const* p_,
 
     for( std::size_t j = 0; j < n; ++j )
     {
-        UCh ch = s[ j ];
+        UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
@@ -150,7 +150,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_of( Ch const* p_,
     {
         do
         {
-            UCh ch = p_[ i ];
+            UCh ch = static_cast<UCh>( p_[ i ] );
 
             if( ch >= 0 && ch < 256 && table[ ch ] ) return i;
 
@@ -199,7 +199,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_not_of( Ch const
 
     for( std::size_t j = 0; j < n; ++j )
     {
-        UCh ch = s[ j ];
+        UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
@@ -216,7 +216,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_not_of( Ch const
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
-            UCh ch = p_[ i ];
+            UCh ch = static_cast<UCh>( p_[ i ] );
             if( !( ch >= 0 && ch < 256 && table[ ch ] ) ) return i;
         }
     }
@@ -262,7 +262,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_not_of( Ch const*
 
     for( std::size_t j = 0; j < n; ++j )
     {
-        UCh ch = s[ j ];
+        UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
@@ -283,7 +283,7 @@ template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_not_of( Ch const*
     {
         do
         {
-            UCh ch = p_[ i ];
+            UCh ch = static_cast<UCh>( p_[ i ] );
 
             if( !( ch >= 0 && ch < 256 && table[ ch ] ) ) return i;
 
@@ -381,7 +381,7 @@ public:
     }
 
     template<class End> BOOST_CXX14_CONSTEXPR basic_string_view( Ch const* first, End last,
-        typename boost::enable_if<boost::core::detail::is_same<End, Ch const*> >::type* = 0 ) BOOST_NOEXCEPT: p_( first ), n_( last - first )
+        typename boost::enable_if<boost::core::detail::is_same<End, Ch const*>, int >::type = 0 ) BOOST_NOEXCEPT: p_( first ), n_( static_cast<size_type>( last - first ) )
     {
         BOOST_ASSERT( last - first >= 0 );
     }
@@ -392,14 +392,14 @@ public:
 
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 
-    basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch> > const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
+    BOOST_CONSTEXPR basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch> > const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
 #endif
 
     template<class Ch2> basic_string_view( boost::basic_string_view<Ch2, std::char_traits<Ch2> > const& str,
-        typename boost::enable_if<boost::core::detail::is_same<Ch, Ch2> >::type* = 0 ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
+        typename boost::enable_if<boost::core::detail::is_same<Ch, Ch2>, int >::type = 0 ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
@@ -681,7 +681,7 @@ public:
 
         Ch const* r = traits_type::find( data() + pos, size() - pos, c );
 
-        return r? r - data(): npos;
+        return r? static_cast<size_type>( r - data() ): npos;
     }
 
     BOOST_CXX14_CONSTEXPR size_type find( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
@@ -696,11 +696,11 @@ public:
 
         for( ;; )
         {
-            p = traits_type::find( p, last - p, s[0] );
+            p = traits_type::find( p, static_cast<size_type>( last - p ), s[0] );
 
             if( p == 0 ) break;
 
-            if( traits_type::compare( p + 1, s + 1, n - 1 ) == 0 ) return p - data();
+            if( traits_type::compare( p + 1, s + 1, n - 1 ) == 0 ) return static_cast<size_type>( p - data() );
 
             ++p;
         }
@@ -1181,11 +1181,6 @@ public:
     }
 
 #endif
-
-    inline friend std::size_t hash_value( basic_string_view const& sv )
-    {
-        return boost::hash_range( sv.begin(), sv.end() );
-    }
 };
 
 // stream inserter
@@ -1193,7 +1188,7 @@ public:
 template<class Ch> std::basic_ostream<Ch>& operator<<( std::basic_ostream<Ch>& os, basic_string_view<Ch> str )
 {
     Ch const* p = str.data();
-    std::streamsize n = str.size();
+    std::streamsize n = static_cast<std::streamsize>( str.size() );
 
     std::streamsize m = os.width();
 
@@ -1269,4 +1264,15 @@ struct std::basic_common_reference<
 
 #endif
 
+// std::format support
+
+#if !defined(BOOST_NO_CXX20_HDR_FORMAT)
+
+template<class Ch, class Ch2>
+struct std::formatter<boost::core::basic_string_view<Ch>, Ch2>: std::formatter<std::basic_string_view<Ch>, Ch2>
+{
+};
+
+#endif
+
 #endif  // #ifndef BOOST_CORE_STRING_VIEW_HPP_INCLUDED

include/boost/core/empty_value.hpp

@@ -95,9 +95,57 @@ private:
 };
 
 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+#if defined(BOOST_MSVC)
+/*
+This is a workaround to an MSVC bug when T is a nested class:
+https://developercommunity.visualstudio.com/t/Compiler-bug:-Incorrect-C2247-and-C2248/10690025
+*/
+namespace detail {
+
+template<class T>
+class empty_value_base
+    : public T {
+public:
+#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
+    empty_value_base() = default;
+#else
+    BOOST_CONSTEXPR empty_value_base() { }
+#endif
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    template<class U, class... Args>
+    BOOST_CONSTEXPR empty_value_base(U&& value, Args&&... args)
+        : T(std::forward<U>(value), std::forward<Args>(args)...) { }
+#else
+    template<class U>
+    BOOST_CONSTEXPR empty_value_base(U&& value)
+        : T(std::forward<U>(value)) { }
+#endif
+#else
+    template<class U>
+    BOOST_CONSTEXPR empty_value_base(const U& value)
+        : T(value) { }
+
+    template<class U>
+    BOOST_CONSTEXPR empty_value_base(U& value)
+        : T(value) { }
+#endif
+};
+
+} /* detail */
+#endif
+
 template<class T, unsigned N>
 class empty_value<T, N, true>
+#if defined(BOOST_MSVC)
+    : detail::empty_value_base<T> {
+    typedef detail::empty_value_base<T> empty_base_;
+#else
     : T {
+    typedef T empty_base_;
+#endif
+
 public:
     typedef T type;
 
@@ -108,26 +156,26 @@ public:
 #endif
 
     BOOST_CONSTEXPR empty_value(boost::empty_init_t)
-        : T() { }
+        : empty_base_() { }
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
     template<class U, class... Args>
     BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value, Args&&... args)
-        : T(std::forward<U>(value), std::forward<Args>(args)...) { }
+        : empty_base_(std::forward<U>(value), std::forward<Args>(args)...) { }
 #else
     template<class U>
     BOOST_CONSTEXPR empty_value(boost::empty_init_t, U&& value)
-        : T(std::forward<U>(value)) { }
+        : empty_base_(std::forward<U>(value)) { }
 #endif
 #else
     template<class U>
     BOOST_CONSTEXPR empty_value(boost::empty_init_t, const U& value)
-        : T(value) { }
+        : empty_base_(value) { }
 
     template<class U>
     BOOST_CONSTEXPR empty_value(boost::empty_init_t, U& value)
-        : T(value) { }
+        : empty_base_(value) { }
 #endif
 
     BOOST_CONSTEXPR const T& get() const BOOST_NOEXCEPT {

include/boost/core/fclose_deleter.hpp

@@ -26,6 +26,9 @@
 
 namespace boost {
 
+// Block unintended ADL
+namespace fclose_deleter_ns {
+
 //! A function object that closes a file
 struct fclose_deleter
 {
@@ -41,6 +44,10 @@ struct fclose_deleter
     }
 };
 
+} // namespace fclose_deleter_ns
+
+using fclose_deleter_ns::fclose_deleter;
+
 } // namespace boost
 
 #endif // BOOST_CORE_FCLOSE_DELETER_HPP

include/boost/core/functor.hpp

@@ -0,0 +1,41 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   functor.hpp
+ * \author Andrey Semashev
+ * \date   2024-01-23
+ *
+ * This header contains a \c functor implementation. This is a function object
+ * that invokes a function that is specified as its template parameter.
+ */
+
+#ifndef BOOST_CORE_FUNCTOR_HPP
+#define BOOST_CORE_FUNCTOR_HPP
+
+namespace boost::core {
+
+// Block unintended ADL
+namespace functor_ns {
+
+//! A function object that invokes a function specified as its template parameter
+template< auto Function >
+struct functor
+{
+    template< typename... Args >
+    auto operator() (Args&&... args) const noexcept(noexcept(Function(static_cast< Args&& >(args)...))) -> decltype(Function(static_cast< Args&& >(args)...))
+    {
+        return Function(static_cast< Args&& >(args)...);
+    }
+};
+
+} // namespace functor_ns
+
+using functor_ns::functor;
+
+} // namespace boost::core
+
+#endif // BOOST_CORE_FUNCTOR_HPP

include/boost/core/launder.hpp

@@ -11,14 +11,28 @@
 //  Distributed under the Boost Software License, Version 1.0.
 //  https://www.boost.org/LICENSE_1_0.txt
 
+#include <boost/config.hpp>
+
 #if defined(__has_builtin)
 # if __has_builtin(__builtin_launder)
 #  define BOOST_CORE_HAS_BUILTIN_LAUNDER
 # endif
 #endif
 
-#if (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) && !defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
-# include <new>
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1920
+
+// msvc-14.1 suffers from internal compiler errors when using std::launder
+// https://github.com/boostorg/core/issues/160
+// https://github.com/boostorg/optional/issues/122
+
+#elif (BOOST_CXX_VERSION >= 201703L) && !defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
+
+#include <new>
+
+#if defined(__cpp_lib_launder)
+# define BOOST_CORE_HAS_STD_LAUNDER
+#endif
+
 #endif
 
 namespace boost
@@ -33,7 +47,7 @@ template<class T> T* launder( T* p )
     return __builtin_launder( p );
 }
 
-#elif (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) && defined(__cpp_lib_launder)
+#elif defined(BOOST_CORE_HAS_STD_LAUNDER)
 
 template<class T> T* launder( T* p )
 {

include/boost/core/lightweight_test.hpp

@@ -153,6 +153,7 @@ inline void no_throw_failed_impl(const char* expr, const char* what, const char*
 #elif defined(__GNUC__) && !(defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 406
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wsign-compare"
+# pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
 
 // specialize test output for char pointers to avoid printing as cstring

include/boost/core/null_deleter.hpp

@@ -27,6 +27,9 @@
 
 namespace boost {
 
+// Block unintended ADL
+namespace null_deleter_ns {
+
 //! A function object that does nothing and can be used as an empty deleter for \c shared_ptr
 struct null_deleter
 {
@@ -39,6 +42,10 @@ struct null_deleter
     void operator() (T*) const BOOST_NOEXCEPT {}
 };
 
+} // namespace null_deleter_ns
+
+using null_deleter_ns::null_deleter;
+
 } // namespace boost
 
 #endif // BOOST_CORE_NULL_DELETER_HPP

include/boost/core/pointer_in_range.hpp

@@ -0,0 +1,49 @@
+/*
+Copyright 2024 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_POINTER_IN_RANGE_HPP
+#define BOOST_CORE_POINTER_IN_RANGE_HPP
+
+#include <boost/config.hpp>
+#include <functional>
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+#if defined(BOOST_MSVC) && BOOST_MSVC >= 1925
+#define BOOST_CORE_DETAIL_HAS_IS_CONSTEVAL
+#elif defined(__has_builtin)
+#if __has_builtin(__builtin_is_constant_evaluated)
+#define BOOST_CORE_DETAIL_HAS_IS_CONSTEVAL
+#endif
+#endif
+#endif
+
+#if !defined(BOOST_CORE_DETAIL_HAS_IS_CONSTEVAL)
+#define BOOST_CORE_NO_CONSTEXPR_POINTER_IN_RANGE
+#endif
+
+namespace boost {
+
+template<class T>
+inline BOOST_CONSTEXPR bool
+pointer_in_range(const T* p, const T* b, const T* e)
+{
+#if defined(BOOST_CORE_DETAIL_HAS_IS_CONSTEVAL)
+    if ( __builtin_is_constant_evaluated()) {
+        for (; b != e; ++b) {
+            if (b == p) {
+                return true;
+            }
+        }
+        return false;
+    }
+#endif
+    return std::less_equal<const T*>()(b, p) && std::less<const T*>()(p, e);
+}
+
+} /* boost */
+
+#endif

include/boost/core/scoped_enum.hpp

@@ -37,7 +37,7 @@ namespace boost
   /**
    * Casts a scoped enum to its underlying type.
    *
-   * This function is useful when working with scoped enum classes, which doens't implicitly convert to the underlying type.
+   * This function is useful when working with scoped enum classes, which doesn't implicitly convert to the underlying type.
    * @param v A scoped enum.
    * @returns The underlying type.
    * @throws No-throws.

include/boost/core/span.hpp

@@ -8,6 +8,7 @@ Distributed under the Boost Software License, Version 1.0.
 #ifndef BOOST_CORE_SPAN_HPP
 #define BOOST_CORE_SPAN_HPP
 
+#include <boost/core/detail/assert.hpp>
 #include <boost/core/data.hpp>
 #include <array>
 #include <iterator>
@@ -274,17 +275,21 @@ public:
     }
 
     constexpr span<T, dynamic_extent> first(size_type c) const {
-        return span<T, dynamic_extent>(s_.p, c);
+        return BOOST_CORE_DETAIL_ASSERT(c <= size()),
+            span<T, dynamic_extent>(s_.p, c);
     }
 
     constexpr span<T, dynamic_extent> last(size_type c) const {
-        return span<T, dynamic_extent>(s_.p + (s_.n - c), c);
+        return BOOST_CORE_DETAIL_ASSERT(c <= size()),
+            span<T, dynamic_extent>(s_.p + (s_.n - c), c);
     }
 
     constexpr span<T, dynamic_extent> subspan(size_type o,
         size_type c = dynamic_extent) const {
-        return span<T, dynamic_extent>(s_.p + o,
-            c == dynamic_extent ? s_.n - o : c);
+        return BOOST_CORE_DETAIL_ASSERT(o <= size() &&
+                (c == dynamic_extent || c + o <= size())),
+            span<T, dynamic_extent>(s_.p + o,
+                c == dynamic_extent ? s_.n - o : c);
     }
 
     constexpr size_type size() const noexcept {
@@ -300,15 +305,15 @@ public:
     }
 
     constexpr reference operator[](size_type i) const {
-        return s_.p[i];
+        return BOOST_CORE_DETAIL_ASSERT(i < size()), s_.p[i];
     }
 
     constexpr reference front() const {
-        return *s_.p;
+        return BOOST_CORE_DETAIL_ASSERT(!empty()), *s_.p;
     }
 
     constexpr reference back() const {
-        return s_.p[s_.n - 1];
+        return BOOST_CORE_DETAIL_ASSERT(!empty()), s_.p[s_.n - 1];
     }
 
     constexpr pointer data() const noexcept {
@@ -351,8 +356,10 @@ private:
     detail::span_store<T, E> s_;
 };
 
+#if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
 template<class T, std::size_t E>
 constexpr std::size_t span<T, E>::extent;
+#endif
 
 #ifdef __cpp_deduction_guides
 template<class I, class L>

include/boost/core/type_name.hpp

@@ -103,7 +103,8 @@ inline std::string fix_typeid_name( char const* n )
 }
 
 // class types can be incomplete
-template<class T> std::string typeid_name_impl( int T::* )
+// but also abstract (T[1] doesn't form)
+template<class T> std::string typeid_name_impl( int T::*, T(*)[1] )
 {
     std::string r = fix_typeid_name( typeid(T[1]).name() );
     return r.substr( 0, r.size() - 4 ); // remove ' [1]' suffix
@@ -116,7 +117,7 @@ template<class T> std::string typeid_name_impl( ... )
 
 template<class T> std::string typeid_name()
 {
-    return typeid_name_impl<T>( 0 );
+    return typeid_name_impl<T>( 0, 0 );
 }
 
 // template names
@@ -345,6 +346,8 @@ template<> struct tn_holder<boost::uint128_type>
 
 #endif
 
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+
 template<> struct tn_holder<wchar_t>
 {
     static std::string type_name( std::string const& suffix )
@@ -353,6 +356,8 @@ template<> struct tn_holder<wchar_t>
     }
 };
 
+#endif
+
 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 
 template<> struct tn_holder<char16_t>

test/CMakeLists.txt

@@ -8,17 +8,6 @@ if(HAVE_BOOST_TEST)
 
 boost_test_jamfile(FILE Jamfile.v2 LINK_LIBRARIES Boost::core Boost::static_assert Boost::type_traits)
 
-set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::type_traits)
-
-boost_test(TYPE run SOURCES eif_constructors.cpp)
-boost_test(TYPE run SOURCES eif_dummy_arg_disambiguation.cpp)
-boost_test(TYPE run SOURCES eif_lazy.cpp)
-boost_test(TYPE run SOURCES eif_lazy_test.cpp)
-boost_test(TYPE run SOURCES eif_member_templates.cpp)
-boost_test(TYPE run SOURCES eif_namespace_disambiguation.cpp)
-boost_test(TYPE run SOURCES eif_no_disambiguation.cpp)
-boost_test(TYPE run SOURCES eif_partial_specializations.cpp)
-
 set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::throw_exception)
 
 boost_test(TYPE run SOURCES no_exceptions_support_test.cpp)
@@ -27,6 +16,10 @@ set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::utility)
 
 boost_test(TYPE run SOURCES sv_conversion_test2.cpp)
 
+set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::container_hash)
+
+boost_test(TYPE run SOURCES sv_hash_test.cpp)
+
 set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::config Boost::move Boost::smart_ptr)
 
 boost_test(TYPE run SOURCES fclose_deleter_test.cpp)

test/Jamfile.v2

@@ -6,11 +6,15 @@
 #  See accompanying file LICENSE_1_0.txt or copy at
 #  http://www.boost.org/LICENSE_1_0.txt
 
+require-b2 5.0.1 ;
+import-search /boost/config/checks ;
+import config : requires ;
 import modules ;
 import testing ;
 
 project : requirements
-
+  <library>/boost/core//boost_core
+  <library>/boost/type_traits//boost_type_traits
   <warnings>extra
   <toolset>msvc:<warnings-as-errors>on
   <toolset>clang:<warnings-as-errors>on
@@ -22,6 +26,17 @@ local warnings-as-errors-off =
     "-<toolset>gcc:<warnings-as-errors>on"
     "-<toolset>clang:<warnings-as-errors>on" ;
 
+local pedantic-errors = <warnings>pedantic
+    <toolset>gcc:<cxxflags>"-Wconversion"
+    <toolset>gcc:<cxxflags>"-Wsign-conversion"
+    <toolset>clang:<cxxflags>"-Wconversion"
+    <toolset>clang:<cxxflags>"-Wsign-conversion"
+    <toolset>msvc:<warnings-as-errors>on
+    <toolset>gcc:<warnings-as-errors>on
+    <toolset>clang:<warnings-as-errors>on ;
+
+local CPP11 = [ requires cxx11_variadic_templates cxx11_template_aliases cxx11_decltype cxx11_constexpr cxx11_noexcept cxx11_ref_qualifiers ] ;
+
 # quick test (for CI)
 run quick.cpp ;
 
@@ -34,11 +49,16 @@ compile addressof_constexpr_test.cpp ;
 compile-fail addressof_fail_rvalue.cpp
   : $(warnings-as-errors-off) ;
 
-run checked_delete_test.cpp ;
+run checked_delete_test.cpp
+  : : : $(pedantic-errors) ;
 compile-fail checked_delete_fail.cpp
   : $(warnings-as-errors-off) ;
 compile-fail checked_delete_fail2.cpp
   : $(warnings-as-errors-off) ;
+compile-fail checked_deleter_compile_fail_adl.cpp
+  : $(warnings-as-errors-off) ;
+compile-fail checked_array_deleter_compile_fail_adl.cpp
+  : $(warnings-as-errors-off) ;
 
 compile ref_ct_test.cpp ;
 run ref_test.cpp ;
@@ -65,14 +85,14 @@ compile-fail ref_implicit_fail4.cpp
 run ref_cv_test.cpp ;
 run ref_conversion_test.cpp ;
 
-run eif_constructors.cpp : ;
-run eif_dummy_arg_disambiguation.cpp : ;
-run eif_lazy.cpp : ;
-run eif_lazy_test.cpp : ;
-run eif_member_templates.cpp : ;
-run eif_namespace_disambiguation.cpp : ;
-run eif_no_disambiguation.cpp : ;
-run eif_partial_specializations.cpp : ;
+run eif_constructors.cpp ;
+run eif_dummy_arg_disambiguation.cpp ;
+run eif_lazy.cpp ;
+run eif_lazy_test.cpp ;
+run eif_member_templates.cpp ;
+run eif_namespace_disambiguation.cpp ;
+run eif_no_disambiguation.cpp ;
+run eif_partial_specializations.cpp ;
 
 compile-fail noncopyable_compile_fail.cpp
   : $(warnings-as-errors-off) ;
@@ -97,13 +117,6 @@ run visit_each_test.cpp ;
 
 run get_pointer_test.cpp ;
 
-local pedantic-errors = <warnings>pedantic
-    <toolset>gcc:<cxxflags>"-Wconversion"
-    <toolset>clang:<cxxflags>"-Wconversion"
-    <toolset>msvc:<warnings-as-errors>on
-    <toolset>gcc:<warnings-as-errors>on
-    <toolset>clang:<warnings-as-errors>on ;
-
 run lightweight_test_test.cpp
   : : : $(pedantic-errors) ;
 run lightweight_test_test.cpp : : :
@@ -187,7 +200,22 @@ compile-fail scoped_enum_compile_fail_conv_to_int.cpp
 
 run underlying_type.cpp ;
 
-run fclose_deleter_test.cpp : : : <target-os>windows:<define>_CRT_SECURE_NO_WARNINGS <target-os>windows:<define>_CRT_SECURE_NO_DEPRECATE ;
+compile-fail null_deleter_compile_fail_adl.cpp
+  : $(warnings-as-errors-off) ;
+
+run fclose_deleter_test.cpp : : :
+  $(CPP11)
+  <library>/boost/move//boost_move
+  <library>/boost/smart_ptr//boost_smart_ptr
+  <target-os>windows:<define>_CRT_SECURE_NO_WARNINGS
+  <target-os>windows:<define>_CRT_SECURE_NO_DEPRECATE ;
+
+compile-fail fclose_deleter_compile_fail_adl.cpp
+  : <target-os>windows:<define>_CRT_SECURE_NO_WARNINGS <target-os>windows:<define>_CRT_SECURE_NO_DEPRECATE $(warnings-as-errors-off) ;
+
+run functor_test.cpp ;
+compile-fail functor_compile_fail_adl.cpp
+  : $(warnings-as-errors-off) ;
 
 run pointer_traits_pointer_test.cpp ;
 run pointer_traits_element_type_test.cpp ;
@@ -209,6 +237,8 @@ run empty_value_test.cpp ;
 run empty_value_size_test.cpp ;
 run empty_value_final_test.cpp ;
 run empty_value_constexpr_test.cpp ;
+compile empty_value_nested_test.cpp ;
+compile-fail empty_value_compile_fail_casting.cpp ;
 
 run quick_exit_test.cpp ;
 run-fail quick_exit_fail.cpp ;
@@ -251,6 +281,7 @@ run allocator_destroy_test.cpp ;
 run allocator_construct_n_test.cpp ;
 run allocator_destroy_n_test.cpp ;
 run allocator_traits_test.cpp ;
+compile allocator_pmr_test.cpp ;
 
 lib lib_typeid : lib_typeid.cpp : <link>shared:<define>LIB_TYPEID_DYN_LINK=1 ;
 
@@ -319,42 +350,69 @@ run type_name_test.cpp ;
 
 run snprintf_test.cpp ;
 
-run sv_types_test.cpp ;
-run sv_construct_test.cpp ;
-run sv_iteration_test.cpp ;
-run sv_element_access_test.cpp ;
-run sv_modifiers_test.cpp ;
-run sv_copy_test.cpp ;
-run sv_substr_test.cpp ;
-run sv_compare_test.cpp ;
-run sv_starts_with_test.cpp ;
-run sv_ends_with_test.cpp ;
-run sv_find_test.cpp ;
-run sv_rfind_test.cpp ;
+run sv_types_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_construct_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_iteration_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_element_access_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_modifiers_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_copy_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_substr_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_compare_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_starts_with_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_ends_with_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_find_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_rfind_test.cpp
+  : : : $(pedantic-errors) ;
 run sv_find_first_of_test.cpp
-  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+  : : : $(pedantic-errors) <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
 run sv_find_last_of_test.cpp
-  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+  : : : $(pedantic-errors) <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
 run sv_find_first_not_of_test.cpp
-  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+  : : : $(pedantic-errors) <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
 run sv_find_last_not_of_test.cpp
-  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
-run sv_contains_test.cpp ;
-run sv_eq_test.cpp ;
-run sv_lt_test.cpp ;
-run sv_stream_insert_test.cpp ;
-run sv_conversion_test.cpp ;
-run sv_conversion_test2.cpp : ;
-run sv_common_reference_test.cpp ;
+  : : : $(pedantic-errors) <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+run sv_contains_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_eq_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_lt_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_stream_insert_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_conversion_test.cpp
+  : : : $(pedantic-errors) ;
+run sv_conversion_test2.cpp : : : <library>/boost/utility//boost_utility ;
+run sv_common_reference_test.cpp
+  : : : $(pedantic-errors) ;
 compile sv_common_reference_test2.cpp ;
 compile sv_windows_h_test.cpp ;
 compile-fail sv_nullptr_fail.cpp
   : $(warnings-as-errors-off) ;
 
+compile sv_construct_test_cx.cpp ;
+compile sv_construct_test_cx2.cpp ;
+
+run sv_hash_test.cpp : : : $(CPP11) <library>/boost/container_hash//boost_container_hash ;
+
+run sv_format_test.cpp
+  : : : $(pedantic-errors) ;
+
 run span_test.cpp ;
 run span_types_test.cpp ;
 run span_constructible_test.cpp ;
 run span_deduction_guide_test.cpp ;
+run span_constexpr_test.cpp ;
 run as_bytes_test.cpp ;
 run as_writable_bytes_test.cpp ;
 compile span_boost_begin_test.cpp ;
@@ -378,7 +436,15 @@ run memory_resource_test.cpp ;
 run data_test.cpp ;
 run size_test.cpp ;
 
-local with-serialization = <library>/boost//serialization/<warnings>off $(warnings-as-errors-off) <undefined-sanitizer>norecover:<link>static ;
+local with-serialization =
+    <library>/boost/serialization//boost_serialization/<warnings>off
+    $(warnings-as-errors-off)
+    <undefined-sanitizer>norecover:<link>static
+    $(CPP11)
+    # Serialization no longer builds under classic MinGW
+    # and <toolset>gcc,<target-os>windows,<address-model>32 fails for some reason
+    <toolset>gcc,<target-os>windows:<build>no
+;
 
 run serialization_nvp_test.cpp : : : $(with-serialization) <undefined-sanitizer>norecover:<build>no ;
 run serialization_split_free_test.cpp : : : $(with-serialization) ;
@@ -394,5 +460,11 @@ run sp_thread_sleep_test.cpp ;
 run yield_prim_windows_h_test.cpp ;
 run yield_prim_pthread_cancel_test.cpp : ;
 
+run pointer_in_range_test.cpp ;
+compile pointer_in_range_constexpr_test.cpp ;
+
+run minstd_rand_test.cpp
+  : : : $(pedantic-errors) ;
+
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;

test/allocator_pmr_test.cpp

@@ -0,0 +1,22 @@
+//
+// Testing stdlib polymorphic allocators
+//
+// Copyright 2024 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
+//
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/config.hpp>
+
+#ifndef BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
+#include <memory_resource>
+
+void pmr_allocator_destroy_compiles(std::pmr::polymorphic_allocator<int>& alloc, int* p)
+{
+    boost::allocator_destroy(alloc, p);
+}
+
+#endif // !defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)

test/bit_ceil_test.cpp

@@ -19,14 +19,15 @@ template<class T> void test_bit_ceil( T x )
 
     T y = boost::core::bit_ceil( x );
 
+    BOOST_TEST( boost::core::has_single_bit( y ) );
+    BOOST_TEST_GE( +y, +x );
+
     if( x == 0 )
     {
-        BOOST_TEST_EQ( y, 0 );
+        BOOST_TEST_EQ( y, 1 );
     }
     else
     {
-        BOOST_TEST( boost::core::has_single_bit( y ) );
-        BOOST_TEST_GE( +y, +x );
         BOOST_TEST_LT( y >> 1, +x );
     }
 }

test/checked_array_deleter_compile_fail_adl.cpp

@@ -0,0 +1,30 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   checked_array_deleter_compile_fail_adl.cpp
+ * \author Andrey Semashev
+ * \date   07.02.2024
+ *
+ * This file tests that \c boost::checked_array_deleter doesn't bring namespace
+ * \c boost into ADL.
+ */
+
+#include <boost/core/checked_delete.hpp>
+
+namespace boost {
+
+void check_adl(checked_array_deleter< int > const&)
+{
+}
+
+} // namespace boost
+
+int main()
+{
+    // Must not find boost::check_adl
+    check_adl(boost::checked_array_deleter< int >());
+}

test/checked_deleter_compile_fail_adl.cpp

@@ -0,0 +1,30 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   checked_deleter_compile_fail_adl.cpp
+ * \author Andrey Semashev
+ * \date   07.02.2024
+ *
+ * This file tests that \c boost::checked_deleter doesn't bring namespace
+ * \c boost into ADL.
+ */
+
+#include <boost/core/checked_delete.hpp>
+
+namespace boost {
+
+void check_adl(checked_deleter< int > const&)
+{
+}
+
+} // namespace boost
+
+int main()
+{
+    // Must not find boost::check_adl
+    check_adl(boost::checked_deleter< int >());
+}

test/cmake_install_test/CMakeLists.txt

@@ -14,4 +14,4 @@ target_link_libraries(quick Boost::core)
 enable_testing()
 add_test(quick quick)
 
-add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)
+add_custom_target(check VERBATIM COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)

test/cmake_subdir_test/CMakeLists.txt

@@ -18,4 +18,4 @@ target_link_libraries(quick Boost::core)
 enable_testing()
 add_test(quick quick)
 
-add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)
+add_custom_target(check VERBATIM COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)

test/detail_iterator_test.cpp

@@ -31,7 +31,7 @@ using std::distance;
 
 */
 
-// struct C {} doesn't wotk with libc++.
+// struct C {} doesn't work with libc++.
 typedef std::forward_iterator_tag C;
 
 struct T

test/empty_value_compile_fail_casting.cpp

@@ -0,0 +1,20 @@
+// Copyright 2024 Braden Ganetsky
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/empty_value.hpp>
+
+struct empty {};
+
+// This test ensures private inheritance of `boost::empty_value<T>` for empty `T`.
+// With public inheritance, `boost::empty_value<empty>*` could cast to `empty*`.
+void test_empty_not_convertible_to_base()
+{
+    const boost::empty_value<empty> x(boost::empty_init);
+    const empty* x2 = static_cast<const empty*>(&x);
+    (void)x2;
+}
+
+int main()
+{
+}

test/empty_value_nested_test.cpp

@@ -0,0 +1,45 @@
+/*
+Copyright 2024 Braden Ganetsky
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/empty_value.hpp>
+
+/*
+Tests workaround for MSVC bug:
+https://developercommunity.visualstudio.com/t/Compiler-bug:-Incorrect-C2247-and-C2248/10690025
+*/
+template<class T>
+struct derived
+    : boost::empty_value<T> {
+    typedef typename boost::empty_value<T>::type type;
+    derived(boost::empty_init_t e)
+        : boost::empty_value<T>(e) { }
+};
+
+struct outer {
+    struct inner_empty { };
+    struct inner_non_empty {
+        inner_non_empty()
+            : value() { }
+        int value;
+    };
+};
+
+void test()
+{
+    const boost::empty_value<outer> x1(boost::empty_init);
+    (void)x1;
+    const boost::empty_value<outer::inner_empty> x2(boost::empty_init);
+    (void)x2;
+    const boost::empty_value<outer::inner_non_empty> x3(boost::empty_init);
+    (void)x3;
+    const derived<outer> x4(boost::empty_init);
+    (void)x4;
+    const derived<outer::inner_empty> x5(boost::empty_init);
+    (void)x5;
+    const derived<outer::inner_non_empty> x6(boost::empty_init);
+    (void)x6;
+}

test/fclose_deleter_compile_fail_adl.cpp

@@ -0,0 +1,30 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   fclose_deleter_compile_fail_adl.cpp
+ * \author Andrey Semashev
+ * \date   02.02.2024
+ *
+ * This file tests that \c boost::fclose_deleter doesn't bring namespace
+ * \c boost into ADL.
+ */
+
+#include <boost/core/fclose_deleter.hpp>
+
+namespace boost {
+
+void check_adl(fclose_deleter const&)
+{
+}
+
+} // namespace boost
+
+int main()
+{
+    // Must not find boost::check_adl
+    check_adl(boost::fclose_deleter());
+}

test/functor_compile_fail_adl.cpp

@@ -0,0 +1,32 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   functor_compile_fail_adl.cpp
+ * \author Andrey Semashev
+ * \date   02.02.2024
+ *
+ * This file tests that \c boost::core::functor doesn't bring namespace
+ * \c boost::core into ADL.
+ */
+
+#include <boost/core/functor.hpp>
+
+void func() {}
+
+namespace boost::core {
+
+void check_adl(functor< ::func > const&)
+{
+}
+
+} // namespace boost::core
+
+int main()
+{
+    // Must not find boost::check_adl
+    check_adl(boost::core::functor< ::func >());
+}

test/functor_test.cpp

@@ -0,0 +1,202 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   functor_test.cpp
+ * \author Andrey Semashev
+ * \date   2024-01-23
+ *
+ * This file contains tests for \c boost::core::functor.
+ */
+
+#include <boost/config.hpp>
+
+#if !defined(BOOST_NO_CXX17_AUTO_NONTYPE_TEMPLATE_PARAMS)
+
+#include <boost/core/functor.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+
+#if (defined(__cpp_lib_is_invocable) && (__cpp_lib_is_invocable >= 201703l)) || \
+    (defined(BOOST_MSSTL_VERSION) && (BOOST_MSSTL_VERSION >= 140) && (BOOST_CXX_VERSION >= 201703l))
+
+namespace test {
+
+using std::is_invocable;
+
+} // namespace test
+
+#else
+
+namespace test {
+
+// A simplified implementation that does not support member function pointers
+template< typename Func, typename... Args >
+struct is_invocable_impl
+{
+    template< typename F = Func, typename = decltype(std::declval< F >()(std::declval< Args >()...)) >
+    static std::true_type _check_invocable(int);
+    static std::false_type _check_invocable(...);
+
+    typedef decltype(is_invocable_impl::_check_invocable(0)) type;
+};
+
+template< typename Func, typename... Args >
+struct is_invocable : public is_invocable_impl< Func, Args... >::type { };
+
+} // namespace test
+
+#endif
+
+int g_n = 0;
+
+void void_func()
+{
+    ++g_n;
+}
+
+int int_func()
+{
+    return ++g_n;
+}
+
+int& int_ref_func()
+{
+    ++g_n;
+    return g_n;
+}
+
+void void_add1(int x)
+{
+    g_n += x;
+}
+
+int add2(int x, int y)
+{
+    return x + y;
+}
+
+namespace test_ns {
+
+int add3(int x, int y, int z)
+{
+    return x + y + z;
+}
+
+} // namespace test_ns
+
+int int_func_noexcept() noexcept
+{
+    return ++g_n;
+}
+
+int main()
+{
+    {
+        boost::core::functor< void_func > fun;
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_func >& >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_func > const& >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< void_func > const&, int >));
+        BOOST_TEST_EQ(noexcept(fun()), false);
+        fun();
+        BOOST_TEST_EQ(g_n, 1);
+        fun();
+        BOOST_TEST_EQ(g_n, 2);
+    }
+
+    g_n = 0;
+    {
+        boost::core::functor< int_func > fun;
+        int res = fun();
+        BOOST_TEST_EQ(res, 1);
+        BOOST_TEST_EQ(g_n, 1);
+        res = fun();
+        BOOST_TEST_EQ(res, 2);
+        BOOST_TEST_EQ(g_n, 2);
+    }
+
+    g_n = 0;
+    {
+        boost::core::functor< int_ref_func > fun;
+        int& res1 = fun();
+        BOOST_TEST_EQ(&res1, &g_n);
+        BOOST_TEST_EQ(res1, 1);
+        int& res2 = fun();
+        BOOST_TEST_EQ(&res2, &g_n);
+        BOOST_TEST_EQ(res2, 2);
+    }
+
+    g_n = 0;
+    {
+        boost::core::functor< void_add1 > fun;
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< void_add1 >& >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< void_add1 > const& >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_add1 >&, int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_add1 > const&, int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_add1 >&, short int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< void_add1 > const&, short int >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< void_add1 > const&, int, int >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< void_add1 > const&, const char* >));
+        fun(10);
+        BOOST_TEST_EQ(g_n, 10);
+        fun(20);
+        BOOST_TEST_EQ(g_n, 30);
+    }
+
+    {
+        boost::core::functor< add2 > fun;
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 >& >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 > const& >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 >&, int >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 > const&, int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< add2 >&, int, int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< add2 > const&, int, int >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< add2 >&, short int, signed char >));
+        BOOST_TEST_TRAIT_TRUE((test::is_invocable< boost::core::functor< add2 > const&, short int, signed char >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 > const&, const char* >));
+        BOOST_TEST_TRAIT_FALSE((test::is_invocable< boost::core::functor< add2 > const&, const char*, float >));
+        int res = fun(10, 20);
+        BOOST_TEST_EQ(res, 30);
+        res = fun(30, 40);
+        BOOST_TEST_EQ(res, 70);
+    }
+
+    {
+        boost::core::functor< test_ns::add3 > fun;
+        int res = fun(10, 20, 30);
+        BOOST_TEST_EQ(res, 60);
+        res = fun(40, 50, 60);
+        BOOST_TEST_EQ(res, 150);
+    }
+
+    g_n = 0;
+    {
+        boost::core::functor< int_func_noexcept > fun;
+        BOOST_TEST_EQ(noexcept(fun()), true);
+        int res = fun();
+        BOOST_TEST_EQ(res, 1);
+        BOOST_TEST_EQ(g_n, 1);
+        res = fun();
+        BOOST_TEST_EQ(res, 2);
+        BOOST_TEST_EQ(g_n, 2);
+    }
+
+    return boost::report_errors();
+}
+
+#else // !defined(BOOST_NO_CXX17_AUTO_NONTYPE_TEMPLATE_PARAMS)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Test skipped because C++17 auto non-type template parameters are not supported")
+
+int main()
+{
+    return 0;
+}
+
+#endif // !defined(BOOST_NO_CXX17_AUTO_NONTYPE_TEMPLATE_PARAMS)

test/minstd_rand_test.cpp

@@ -0,0 +1,38 @@
+// Test for boost/core/detail/minstd_rand.hpp
+//
+// Copyright 2022, 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/detail/minstd_rand.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/cstdint.hpp>
+
+int main()
+{
+    {
+        boost::detail::minstd_rand rng;
+
+        boost::uint_least32_t r1 = rng(), x1 = 48271;
+        BOOST_TEST_EQ( r1, x1 );
+
+        for( int i = 0; i < 1000; ++i ) rng();
+
+        boost::uint_least32_t r2 = rng(), x2 = 2076422031;
+        BOOST_TEST_EQ( r2, x2 );
+    }
+
+    {
+        boost::detail::minstd_rand rng( 12345 );
+
+        boost::uint_least32_t r1 = rng(), x1 = 595905495;
+        BOOST_TEST_EQ( r1, x1 );
+
+        for( int i = 0; i < 1000; ++i ) rng();
+
+        boost::uint_least32_t r2 = rng(), x2 = 1065162103;
+        BOOST_TEST_EQ( r2, x2 );
+    }
+
+    return boost::report_errors();
+}

test/null_deleter_compile_fail_adl.cpp

@@ -0,0 +1,30 @@
+/*
+ *             Copyright Andrey Semashev 2024.
+ * 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)
+ */
+/*!
+ * \file   fclose_deleter_compile_fail_adl.cpp
+ * \author Andrey Semashev
+ * \date   02.02.2024
+ *
+ * This file tests that \c boost::null_deleter doesn't bring namespace
+ * \c boost into ADL.
+ */
+
+#include <boost/core/null_deleter.hpp>
+
+namespace boost {
+
+void check_adl(null_deleter const&)
+{
+}
+
+} // namespace boost
+
+int main()
+{
+    // Must not find boost::check_adl
+    check_adl(boost::null_deleter());
+}

test/pointer_in_range_constexpr_test.cpp

@@ -0,0 +1,31 @@
+/*
+Copyright 2024 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/pointer_in_range.hpp>
+#include <boost/static_assert.hpp>
+
+#if !defined(BOOST_CORE_NO_CONSTEXPR_POINTER_IN_RANGE)
+int a[4] = { 0, 0, 0, 0 };
+int n = 0;
+const int b[4] = { 0, 0, 0, 0 };
+const int m = 0;
+
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&a[0], &a[1], a + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&a[1], &a[1], a + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&a[2], &a[1], a + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&a[3], &a[1], a + 4));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(a + 4, &a[1], a + 4));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&n, &a[0], &a[3]));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&m, &a[0], &a[3]));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&b[0], &b[1], b + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&b[1], &b[1], b + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&b[2], &b[1], b + 4));
+BOOST_STATIC_ASSERT(boost::pointer_in_range(&b[3], &b[1], b + 4));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(b + 4, &b[1], b + 4));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&n, &b[0], &b[3]));
+BOOST_STATIC_ASSERT(!boost::pointer_in_range(&m, &b[0], &b[3]));
+#endif

test/pointer_in_range_test.cpp

@@ -0,0 +1,32 @@
+/*
+Copyright 2024 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/pointer_in_range.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int main()
+{
+    int a[4] = { 0, 0, 0, 0 };
+    int n = 0;
+    const int b[4] = { 0, 0, 0, 0 };
+    const int m = 0;
+    BOOST_TEST(!boost::pointer_in_range(&a[0], &a[1], a + 4));
+    BOOST_TEST(boost::pointer_in_range(&a[1], &a[1], a + 4));
+    BOOST_TEST(boost::pointer_in_range(&a[2], &a[1], a + 4));
+    BOOST_TEST(boost::pointer_in_range(&a[3], &a[1], a + 4));
+    BOOST_TEST(!boost::pointer_in_range(a + 4, &a[1], a + 4));
+    BOOST_TEST(!boost::pointer_in_range(&n, &a[0], &a[3]));
+    BOOST_TEST(!boost::pointer_in_range(&m, &a[0], &a[3]));
+    BOOST_TEST(!boost::pointer_in_range(&b[0], &b[1], b + 4));
+    BOOST_TEST(boost::pointer_in_range(&b[1], &b[1], b + 4));
+    BOOST_TEST(boost::pointer_in_range(&b[2], &b[1], b + 4));
+    BOOST_TEST(boost::pointer_in_range(&b[3], &b[1], b + 4));
+    BOOST_TEST(!boost::pointer_in_range(b + 4, &b[1], b + 4));
+    BOOST_TEST(!boost::pointer_in_range(&n, &b[0], &b[3]));
+    BOOST_TEST(!boost::pointer_in_range(&m, &b[0], &b[3]));
+    return boost::report_errors();
+}

test/span_constexpr_test.cpp

@@ -0,0 +1,72 @@
+/*
+Copyright 2025 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_CONSTEXPR)
+#include <boost/core/span.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+constexpr const int array[4]{ 5, 10, 15, 20 };
+
+void test_first()
+{
+    constexpr boost::span<const int> s =
+        boost::span<const int>(array, 4).first(2);
+    BOOST_TEST_EQ(s.data(), &array[0]);
+    BOOST_TEST_EQ(s.size(), 2);
+}
+
+void test_last()
+{
+    constexpr boost::span<const int> s =
+        boost::span<const int>(array, 4).last(2);
+    BOOST_TEST_EQ(s.data(), &array[2]);
+    BOOST_TEST_EQ(s.size(), 2);
+}
+
+void test_subspan()
+{
+    constexpr boost::span<const int> s =
+        boost::span<const int>(array, 4).subspan(1, 2);
+    BOOST_TEST_EQ(s.data(), &array[1]);
+    BOOST_TEST_EQ(s.size(), 2);
+}
+
+void test_index()
+{
+    constexpr const int i = boost::span<const int>(array, 4)[1];
+    BOOST_TEST_EQ(i, 10);
+}
+
+void test_front()
+{
+    constexpr const int i = boost::span<const int>(array, 4).front();
+    BOOST_TEST_EQ(i, 5);
+}
+
+void test_back()
+{
+    constexpr const int i = boost::span<const int>(array, 4).back();
+    BOOST_TEST_EQ(i, 20);
+}
+
+int main()
+{
+    test_first();
+    test_last();
+    test_subspan();
+    test_index();
+    test_front();
+    test_back();
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif

test/sv_construct_test.cpp

@@ -4,6 +4,18 @@
 
 #include <boost/core/detail/string_view.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+#if !defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
+# if defined(__apple_build_version__)
+// Under macOS, it's possible for the header
+// <memory_resource> to be present, but for
+// libc++.dylib to not have support for it.
+// https://github.com/boostorg/core/issues/162
+#  define BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
+# endif
+#endif
+
 #include <iterator>
 #include <string>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)

test/sv_construct_test_cx.cpp

@@ -0,0 +1,147 @@
+// Copyright 2021, 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/detail/string_view.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+# include <string_view>
+#endif
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+int main()
+{
+    {
+        constexpr boost::core::string_view sv;
+
+        STATIC_ASSERT( sv.data() == nullptr );
+        STATIC_ASSERT( sv.size() == 0 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+    {
+        constexpr char const* s = "123";
+
+        constexpr boost::core::string_view sv( s, 0 );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 0 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+    {
+        constexpr char const* s = "123";
+
+        constexpr boost::core::string_view sv( s, 2 );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 2 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+    {
+        constexpr char const* s = "123";
+
+        constexpr boost::core::string_view sv( s, s );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 0 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+    {
+        constexpr char const* s = "123";
+
+        constexpr boost::core::string_view sv( s, s + 2 );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 2 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+
+    {
+        constexpr std::string_view str( "123", 3 );
+
+        constexpr boost::core::string_view sv( str );
+
+        STATIC_ASSERT( sv.data() == str.data() );
+        STATIC_ASSERT( sv.size() == str.size() );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+#endif
+}
+
+#endif

test/sv_construct_test_cx2.cpp

@@ -0,0 +1,75 @@
+// Copyright 2021, 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/detail/string_view.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#elif BOOST_CXX_VERSION < 201703L
+
+// std::char_traits is not constexpr in C++14
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_CXX_VERSION < 201703L" )
+int main() {}
+
+#elif defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION < 70300
+
+// std::char_traits is not constexpr in libstdc++ 7.2
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_LIBSTDCXX_VERSION < 70300" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+int main()
+{
+    {
+        constexpr char const* s = "";
+
+        constexpr boost::core::string_view sv( s );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 0 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+
+    {
+        constexpr char const* s = "123";
+
+        constexpr boost::core::string_view sv( s );
+
+        STATIC_ASSERT( sv.data() == s );
+        STATIC_ASSERT( sv.size() == 3 );
+
+        STATIC_ASSERT( sv.begin() == sv.data() );
+        STATIC_ASSERT( sv.end() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.cbegin() == sv.data() );
+        STATIC_ASSERT( sv.cend() == sv.data() + sv.size() );
+
+        STATIC_ASSERT( sv.length() == sv.size() );
+        STATIC_ASSERT( sv.empty() == ( sv.size() == 0 ) );
+
+        STATIC_ASSERT( sv.max_size() == boost::core::string_view::npos );
+    }
+}
+
+#endif

test/sv_conversion_test.cpp

@@ -4,6 +4,18 @@
 
 #include <boost/core/detail/string_view.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+#if !defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
+# if defined(__apple_build_version__)
+// Under macOS, it's possible for the header
+// <memory_resource> to be present, but for
+// libc++.dylib to not have support for it.
+// https://github.com/boostorg/core/issues/162
+#  define BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
+# endif
+#endif
+
 #include <string>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 # include <string_view>

test/sv_eq_test.cpp

@@ -4,6 +4,18 @@
 
 #include <boost/core/detail/string_view.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+#if !defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
+# if defined(__apple_build_version__)
+// Under macOS, it's possible for the header
+// <memory_resource> to be present, but for
+// libc++.dylib to not have support for it.
+// https://github.com/boostorg/core/issues/162
+#  define BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
+# endif
+#endif
+
 #include <cstddef>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 # include <string_view>

test/sv_find_first_not_of_test.cpp

@@ -494,7 +494,7 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            str[ i ] = static_cast< unsigned char >( i );
+            str[ i ] = static_cast<char>( static_cast< unsigned char >( i ) );
         }
 
         boost::core::string_view sv( str, 256 );
@@ -503,22 +503,22 @@ int main()
 
         std::string str2( sv.data(), sv.size() );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::string str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<char>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), i );
         }
 
         std::reverse( str, str + 256 );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::string str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<char>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), 255 - i );
         }
@@ -538,22 +538,22 @@ int main()
 
         std::wstring str2( sv.data(), sv.size() );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::wstring str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<wchar_t>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), i );
         }
 
         std::reverse( str, str + 256 );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::wstring str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<wchar_t>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), 255 - i );
         }

test/sv_find_first_of_test.cpp

@@ -426,14 +426,14 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            str[ i ] = static_cast< unsigned char >( i );
+            str[ i ] = static_cast<char>( static_cast< unsigned char >( i ) );
         }
 
         boost::core::string_view sv( str, 256 );
 
         for( int i = 0; i < 256; ++i )
         {
-            std::string needle( 12, static_cast< unsigned char >( i ) );
+            std::string needle( 12, static_cast<char>( static_cast< unsigned char >( i ) ) );
             BOOST_TEST_EQ( sv.find_first_of( needle ), i );
         }
 
@@ -441,7 +441,7 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            std::string needle( 12, static_cast< unsigned char >( i ) );
+            std::string needle( 12, static_cast<char>( static_cast< unsigned char >( i ) ) );
             BOOST_TEST_EQ( sv.find_first_of( needle ), 255 - i );
         }
     }

test/sv_find_last_not_of_test.cpp

@@ -494,7 +494,7 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            str[ i ] = static_cast< unsigned char >( i );
+            str[ i ] = static_cast<char>( static_cast< unsigned char >( i ) );
         }
 
         boost::core::string_view sv( str, 256 );
@@ -503,22 +503,22 @@ int main()
 
         std::string str2( sv.data(), sv.size() );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::string str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<char>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_last_not_of( str3 ), i );
         }
 
         std::reverse( str, str + 256 );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::string str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<char>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_last_not_of( str3 ), 255 - i );
         }
@@ -538,22 +538,22 @@ int main()
 
         std::wstring str2( sv.data(), sv.size() );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::wstring str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<wchar_t>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), i );
         }
 
         std::reverse( str, str + 256 );
 
-        for( int i = 0; i < 256; ++i )
+        for( std::size_t i = 0; i < 256; ++i )
         {
             std::wstring str3( str2 );
 
-            str3[ i ] = ~str3[ i ];
+            str3[ i ] = static_cast<wchar_t>( ~str3[ i ] );
 
             BOOST_TEST_EQ( sv.find_first_not_of( str3 ), 255 - i );
         }

test/sv_find_last_of_test.cpp

@@ -444,14 +444,14 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            str[ i ] = static_cast< unsigned char >( i );
+            str[ i ] = static_cast<char>( static_cast< unsigned char >( i ) );
         }
 
         boost::core::string_view sv( str, 256 );
 
         for( int i = 0; i < 256; ++i )
         {
-            std::string needle( 12, static_cast< unsigned char >( i ) );
+            std::string needle( 12, static_cast<char>( static_cast< unsigned char >( i ) ) );
             BOOST_TEST_EQ( sv.find_last_of( needle ), i );
         }
 
@@ -459,7 +459,7 @@ int main()
 
         for( int i = 0; i < 256; ++i )
         {
-            std::string needle( 12, static_cast< unsigned char >( i ) );
+            std::string needle( 12, static_cast<char>( static_cast< unsigned char >( i ) ) );
             BOOST_TEST_EQ( sv.find_last_of( needle ), 255 - i );
         }
     }

test/sv_format_test.cpp

@@ -0,0 +1,30 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/detail/string_view.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if !( defined(__cpp_lib_format) && __cpp_lib_format >= 201907L )
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because __cpp_lib_format is not defined to at least 201907L" )
+int main() {}
+
+#else
+
+#include <format>
+#include <string_view>
+
+int main()
+{
+    BOOST_TEST_EQ( std::format( "{}", boost::core::string_view( "123" ) ), std::format( "{}", std::string_view( "123" ) ) );
+    BOOST_TEST_EQ( std::format( "{:s}", boost::core::string_view( "123" ) ), std::format( "{:s}", std::string_view( "123" ) ) );
+    BOOST_TEST_EQ( std::format( "{:^7}", boost::core::string_view( "123" ) ), std::format( "{:^7}", std::string_view( "123" ) ) );
+    BOOST_TEST_EQ( std::format( "{:-^7}", boost::core::string_view( "123" ) ), std::format( "{:-^7}", std::string_view( "123" ) ) );
+
+    return boost::report_errors();
+}
+
+#endif

test/sv_hash_test.cpp

@@ -0,0 +1,48 @@
+// Copyright 2021-2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/detail/string_view.hpp>
+#include <boost/container_hash/hash.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <string>
+
+template<class T> std::size_t hv( T const& t )
+{
+    return boost::hash<T>()( t );
+}
+
+template<class Ch> void test( Ch const* p )
+{
+    std::basic_string<Ch> s( p );
+    boost::core::basic_string_view<Ch> sv( s );
+
+    BOOST_TEST_EQ( hv( s ), hv( sv ) );
+}
+
+int main()
+{
+    test( "123" );
+    test( L"123" );
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+
+    test( u"123" );
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T)
+
+    test( U"123" );
+
+#endif
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+    test( u8"123" );
+
+#endif
+
+    return boost::report_errors();
+}

test/sv_lt_test.cpp

@@ -4,6 +4,18 @@
 
 #include <boost/core/detail/string_view.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+#if !defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
+# if defined(__apple_build_version__)
+// Under macOS, it's possible for the header
+// <memory_resource> to be present, but for
+// libc++.dylib to not have support for it.
+// https://github.com/boostorg/core/issues/162
+#  define BOOST_NO_CXX17_HDR_MEMORY_RESOURCE
+# endif
+#endif
+
 #include <cstddef>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 # include <string_view>

test/swap/swap_no_ambiguity_in_boost.cpp

@@ -9,7 +9,7 @@
 // objects to be swapped would themselves be from the boost namespace.
 // If so, boost::core::invoke_swap itself might be found by argument dependent lookup.
 // The implementation of boost::core::invoke_swap resolves this issue by giving
-// boost::core::invoke_swap two template argumetns, thereby making it less specialized
+// boost::core::invoke_swap two template arguments, thereby making it less specialized
 // than std::swap.
 
 #include <boost/core/invoke_swap.hpp>

test/swap/swap_specialized_in_global.cpp

@@ -12,7 +12,7 @@
 //Put test class in the global namespace
 #include "./swap_test_class.hpp"
 
-//Provide swap function in gloabl namespace
+//Provide swap function in global namespace
 void swap(swap_test_class& left, swap_test_class& right)
 {
   left.swap(right);

test/type_name_test.cpp

@@ -55,6 +55,13 @@ template<class T1, class T2> struct X
 
 template<class T1, class T2> struct Y;
 
+class W
+{
+public:
+
+    virtual void f() = 0;
+};
+
 enum E1
 {
     e1
@@ -122,6 +129,7 @@ int main()
     TEST(A);
     TEST(B);
     TEST(C);
+    TEST(W);
 
     TEST(E1);
 
@@ -143,6 +151,9 @@ int main()
     TEST(C&);
     TEST(C const&);
 
+    TEST(W const);
+    TEST(W&);
+
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 
     TEST(B&&);
@@ -156,6 +167,8 @@ int main()
     TEST(C*);
     TEST(C const* volatile*);
 
+    TEST(W volatile*);
+
     TEST(void*);
     TEST(void const* volatile*);
 
@@ -307,6 +320,8 @@ int main()
 
     TEST(std::pair<C, C>);
 
+    TEST(std::pair<W, W>);
+
     TEST(std::pair<void, void>);
     TEST(std::pair<std::pair<void, void>, void>);
 
@@ -336,9 +351,11 @@ int main()
     TEST(X<A const&, B&> volatile&);
 
     TEST(X<C, C>);
+    TEST(X<W, W>);
 
     TEST(Y<A, B>);
     TEST(Y<C, C>);
+    TEST(Y<W, W>);
 
     TEST(X<std::pair<void, void>, void>);