Disable cmath_test_generic on msvc-8.0

Reworked extra package installation and added explicit specification
of external package sources. Moved some common constants to environment
variables. Removed installation of unneeded packages in the containers.

.github/workflows/ci.yml

@@ -0,0 +1,509 @@
+# Copyright 2020-2021 Peter Dimov
+# Copyright 2021 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)
+
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - develop
+      - feature/**
+
+concurrency:
+  group: ${{format('{0}:{1}', github.repository, github.ref)}}
+  cancel-in-progress: true
+
+env:
+  GIT_FETCH_JOBS: 8
+  NET_RETRY_COUNT: 5
+  DEFAULT_BUILD_VARIANT: debug,release
+
+jobs:
+  posix:
+    defaults:
+      run:
+        shell: bash
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Linux, gcc
+          - toolset: gcc-4.4
+            cxxstd: "98,0x"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - g++-4.4
+            sources:
+              - "ppa:ubuntu-toolchain-r/test"
+          - toolset: gcc-4.6
+            cxxstd: "03,0x"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - g++-4.6
+            sources:
+              - "ppa:ubuntu-toolchain-r/test"
+          - toolset: gcc-4.7
+            cxxstd: "03,11"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - g++-4.7
+          - toolset: gcc-4.8
+            cxxstd: "03,11"
+            os: ubuntu-18.04
+            install:
+              - g++-4.8
+          - toolset: gcc-4.9
+            cxxstd: "03,11"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - g++-4.9
+          - toolset: gcc-5
+            cxxstd: "03,11,14,1z"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - g++-5
+          - toolset: gcc-6
+            cxxstd: "03,11,14,1z"
+            os: ubuntu-18.04
+            install:
+              - g++-6
+          - toolset: gcc-7
+            cxxstd: "03,11,14,17"
+            os: ubuntu-18.04
+            install:
+              - g++-7
+          - toolset: gcc-8
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-18.04
+            install:
+              - g++-8
+          - toolset: gcc-9
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-18.04
+            install:
+              - g++-9
+          - toolset: gcc-10
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - g++-10
+          - toolset: gcc-11
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - g++-11
+            sources:
+              - "ppa:ubuntu-toolchain-r/test"
+          - name: UBSAN
+            toolset: gcc-11
+            cxxstd: "03,11,14,17,20"
+            ubsan: 1
+            os: ubuntu-20.04
+            install:
+              - g++-11
+            sources:
+              - "ppa:ubuntu-toolchain-r/test"
+
+          # Linux, clang
+          - toolset: clang
+            compiler: clang++-3.5
+            cxxstd: "03,11"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - clang-3.5
+          - toolset: clang
+            compiler: clang++-3.6
+            cxxstd: "03,11,14"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - clang-3.6
+          - toolset: clang
+            compiler: clang++-3.7
+            cxxstd: "03,11,14"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - clang-3.7
+          - toolset: clang
+            compiler: clang++-3.8
+            cxxstd: "03,11,14"
+            os: ubuntu-20.04
+            container: ubuntu:16.04
+            install:
+              - clang-3.8
+          - toolset: clang
+            compiler: clang++-3.9
+            cxxstd: "03,11,14"
+            os: ubuntu-18.04
+            install:
+              - clang-3.9
+          - toolset: clang
+            compiler: clang++-4.0
+            cxxstd: "03,11,14"
+            os: ubuntu-18.04
+            install:
+              - clang-4.0
+          - toolset: clang
+            compiler: clang++-5.0
+            cxxstd: "03,11,14,1z"
+            os: ubuntu-18.04
+            install:
+              - clang-5.0
+          - toolset: clang
+            compiler: clang++-6.0
+            cxxstd: "03,11,14,17"
+            os: ubuntu-18.04
+            install:
+              - clang-6.0
+          - toolset: clang
+            compiler: clang++-7
+            cxxstd: "03,11,14,17"
+            os: ubuntu-18.04
+            install:
+              - clang-7
+          # Note: clang-8 does not fully support C++20, so it is not compatible with libstdc++-8 in this mode
+          - toolset: clang
+            compiler: clang++-8
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-18.04
+            install:
+              - clang-8
+              - g++-7
+            gcc_toolchain: 7
+          - toolset: clang
+            compiler: clang++-9
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-20.04
+            install:
+              - clang-9
+          - toolset: clang
+            compiler: clang++-10
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - clang-10
+          - toolset: clang
+            compiler: clang++-11
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - clang-11
+          - toolset: clang
+            compiler: clang++-12
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - clang-12
+          - toolset: clang
+            compiler: clang++-12
+            cxxstd: "03,11,14,17,20"
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+            os: ubuntu-20.04
+            install:
+              - clang-12
+              - libc++-12-dev
+              - libc++abi-12-dev
+          - name: UBSAN
+            toolset: clang
+            compiler: clang++-12
+            cxxstd: "03,11,14,17,20"
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+            ubsan: 1
+            os: ubuntu-20.04
+            install:
+              - clang-12
+              - libc++-12-dev
+              - libc++abi-12-dev
+
+          - toolset: clang
+            cxxstd: "03,11,14,17,2a"
+            os: macos-10.15
+
+          - name: CMake tests
+            cmake_tests: 1
+            os: ubuntu-20.04
+
+    timeout-minutes: 120
+    runs-on: ${{matrix.os}}
+    container: ${{matrix.container}}
+
+    steps:
+      - name: Setup environment
+        run: |
+            if [ -f "/etc/debian_version" ]
+            then
+                echo "DEBIAN_FRONTEND=noninteractive" >> $GITHUB_ENV
+                export DEBIAN_FRONTEND=noninteractive
+            fi
+            if [ -n "${{matrix.container}}" ]
+            then
+                echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
+                if [ -f "/etc/debian_version" ]
+                then
+                    apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+                    apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y sudo software-properties-common tzdata wget curl apt-transport-https ca-certificates make build-essential g++ python python3 git cmake
+                fi
+            fi
+            git config --global pack.threads 0
+
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: |
+            SOURCE_KEYS=(${{join(matrix.source_keys, ' ')}})
+            SOURCES=(${{join(matrix.sources, ' ')}})
+            for key in "${SOURCE_KEYS[@]}"
+            do
+                for i in {1..$NET_RETRY_COUNT}
+                do
+                    wget -O - "$key" | sudo apt-key add - && break || sleep 2
+                done
+            done
+            if [ ${#SOURCES[@]} -gt 0 ]
+            then
+                APT_ADD_REPO_COMMON_ARGS=("-y")
+                APT_ADD_REPO_HAS_SOURCE_ARGS=0
+                SOFTWARE_PROPERTIES_VERSION="$(dpkg-query --showformat='${Version}' --show software-properties-common)"
+                if dpkg --compare-versions "$SOFTWARE_PROPERTIES_VERSION" ge "0.96.24.20"
+                then
+                    APT_ADD_REPO_COMMON_ARGS+=("-n")
+                fi
+                if dpkg --compare-versions "$SOFTWARE_PROPERTIES_VERSION" ge "0.98.10"
+                then
+                    APT_ADD_REPO_HAS_SOURCE_ARGS=1
+                fi
+                for source in "${SOURCES[@]}"
+                do
+                    for i in {1..$NET_RETRY_COUNT}
+                    do
+                        APT_ADD_REPO_ARGS=("${APT_ADD_REPO_COMMON_ARGS[@]}")
+                        if [ $APT_ADD_REPO_HAS_SOURCE_ARGS -ne 0 ]
+                        then
+                            case "$source" in
+                            "ppa:"*)
+                                APT_ADD_REPO_ARGS+=("-P")
+                                ;;
+                            "deb "*)
+                                APT_ADD_REPO_ARGS+=("-S")
+                                ;;
+                            *)
+                                APT_ADD_REPO_ARGS+=("-U")
+                                ;;
+                            esac
+                        fi
+                        APT_ADD_REPO_ARGS+=("$source")
+                        sudo -E apt-add-repository "${APT_ADD_REPO_ARGS[@]}" && break || sleep 2
+                    done
+                done
+            fi
+            sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+            sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y ${{join(matrix.install, ' ')}}
+
+      - name: Setup GCC Toolchain
+        if: matrix.gcc_toolchain
+        run: |
+            GCC_TOOLCHAIN_ROOT="$HOME/gcc-toolchain"
+            echo "GCC_TOOLCHAIN_ROOT=\"$GCC_TOOLCHAIN_ROOT\"" >> $GITHUB_ENV
+            MULTIARCH_TRIPLET="$(dpkg-architecture -qDEB_HOST_MULTIARCH)"
+            mkdir -p "$GCC_TOOLCHAIN_ROOT"
+            ln -s /usr/include "$GCC_TOOLCHAIN_ROOT/include"
+            ln -s /usr/bin "$GCC_TOOLCHAIN_ROOT/bin"
+            mkdir -p "$GCC_TOOLCHAIN_ROOT/lib/gcc/$MULTIARCH_TRIPLET"
+            ln -s "/usr/lib/gcc/$MULTIARCH_TRIPLET/${{matrix.gcc_toolchain}}" "$GCC_TOOLCHAIN_ROOT/lib/gcc/$MULTIARCH_TRIPLET/${{matrix.gcc_toolchain}}"
+
+      - name: Setup Boost
+        run: |
+            echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
+            LIBRARY=${GITHUB_REPOSITORY#*/}
+            echo LIBRARY: $LIBRARY
+            echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
+            echo GITHUB_BASE_REF: $GITHUB_BASE_REF
+            echo GITHUB_REF: $GITHUB_REF
+            REF=${GITHUB_BASE_REF:-$GITHUB_REF}
+            REF=${REF#refs/heads/}
+            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" >> $GITHUB_ENV
+            DEPINST_ARGS=()
+            GIT_VERSION="$(git --version | sed -e 's/git version //')"
+            GIT_HAS_JOBS=1
+            if [ -f "/etc/debian_version" ]
+            then
+                if $(dpkg --compare-versions "$GIT_VERSION" lt 2.8.0)
+                then
+                    GIT_HAS_JOBS=0
+                fi
+            else
+                declare -a GIT_VER=(${GIT_VERSION//./ })
+                declare -a GIT_MIN_VER=(2 8 0)
+                for ((i=0; i<${#GIT_VER[@]}; i++))
+                do
+                    if [ -z "${GIT_MIN_VER[i]}" ]
+                    then
+                        GIT_MIN_VER[i]=0
+                    fi
+                    if [ "${GIT_VER[i]}" -lt "${GIT_MIN_VER[i]}" ]
+                    then
+                        GIT_HAS_JOBS=0
+                        break
+                    fi
+                done
+            fi
+            if [ "$GIT_HAS_JOBS" -ne 0 ]
+            then
+                DEPINST_ARGS+=("--git_args" "--jobs $GIT_FETCH_JOBS")
+            fi
+            cd ..
+            git clone -b "$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
+            git submodule update --init tools/boostdep
+            DEPINST_ARGS+=("$LIBRARY")
+            python tools/boostdep/depinst/depinst.py "${DEPINST_ARGS[@]}"
+            if [ -z "${{matrix.cmake_tests}}" ]
+            then
+                ./bootstrap.sh
+                ./b2 headers
+                if [ -n "${{matrix.compiler}}" -o -n "$GCC_TOOLCHAIN_ROOT" ]
+                then
+                    echo -n "using ${{matrix.toolset}} : : ${{matrix.compiler}}" > ~/user-config.jam
+                    if [ -n "$GCC_TOOLCHAIN_ROOT" ]
+                    then
+                        echo -n " : <compileflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\" <linkflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\"" >> ~/user-config.jam
+                    fi
+                    echo " ;" >> ~/user-config.jam
+                fi
+            fi
+
+      - name: Run tests
+        if: matrix.cmake_tests == ''
+        run: |
+            cd ../boost-root
+            B2_ARGS=("-j" "$BUILD_JOBS" "toolset=${{matrix.toolset}}" "cxxstd=${{matrix.cxxstd}}")
+            if [ -n "${{matrix.build_variant}}" ]
+            then
+                B2_ARGS+=("variant=${{matrix.build_variant}}")
+            else
+                B2_ARGS+=("variant=$DEFAULT_BUILD_VARIANT")
+            fi
+            if [ -n "${{matrix.threading}}" ]
+            then
+                B2_ARGS+=("threading=${{matrix.threading}}")
+            fi
+            if [ -n "${{matrix.ubsan}}" ]
+            then
+                export UBSAN_OPTIONS="print_stacktrace=1"
+                B2_ARGS+=("cxxflags=-fsanitize=undefined -fno-sanitize-recover=undefined" "linkflags=-fsanitize=undefined -fuse-ld=gold" "define=UBSAN=1" "debug-symbols=on" "visibility=global")
+            fi
+            if [ -n "${{matrix.cxxflags}}" ]
+            then
+                B2_ARGS+=("cxxflags=${{matrix.cxxflags}}")
+            fi
+            if [ -n "${{matrix.linkflags}}" ]
+            then
+                B2_ARGS+=("linkflags=${{matrix.linkflags}}")
+            fi
+            B2_ARGS+=("libs/$LIBRARY/test")
+            ./b2 "${B2_ARGS[@]}"
+
+      - name: Run CMake tests
+        if: matrix.cmake_tests != ''
+        run: |
+            cd ../boost-root
+            mkdir __build_cmake_test__ && cd __build_cmake_test__
+            cmake -DBUILD_TESTING=ON -DBOOST_INCLUDE_LIBRARIES=$LIBRARY ..
+            cmake --build . --target tests
+            ctest --output-on-failure
+
+      - name: Run CMake subdir tests
+        if: matrix.cmake_tests != ''
+        run: |
+            cd ../boost-root/libs/$LIBRARY/test/cmake_subdir_test
+            mkdir __build_cmake_subdir_test__ && cd __build_cmake_subdir_test__
+            cmake ..
+            cmake --build .
+            cmake --build . --target check
+
+      - name: Run CMake install tests
+        if: matrix.cmake_tests != ''
+        run: |
+            cd ../boost-root
+            mkdir __build_cmake_install_test__ && cd __build_cmake_install_test__
+            cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DCMAKE_INSTALL_PREFIX=~/.local ..
+            cmake --build . --target install
+            cd ../libs/$LIBRARY/test/cmake_install_test
+            mkdir __build_cmake_install_test__ && cd __build_cmake_install_test__
+            cmake -DCMAKE_INSTALL_PREFIX=~/.local ..
+            cmake --build .
+            cmake --build . --target check
+
+  windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: msvc-14.1
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2016
+          - toolset: msvc-14.2
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: gcc
+            cxxstd: "03,11,14,17,2a"
+            addrmd: 64
+            os: windows-2019
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Boost
+        shell: cmd
+        run: |
+            echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
+            for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
+            echo LIBRARY: %LIBRARY%
+            echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
+            echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
+            echo GITHUB_REF: %GITHUB_REF%
+            if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
+            set BOOST_BRANCH=develop
+            for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
+            echo BOOST_BRANCH: %BOOST_BRANCH%
+            cd ..
+            git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
+            cd boost-root
+            xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+            git submodule update --init tools/boostdep
+            python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
+            cmd /c bootstrap
+            b2 -d0 headers
+
+      - name: Run tests
+        shell: cmd
+        run: |
+            cd ../boost-root
+            b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release

.travis.yml

@@ -1,412 +0,0 @@
-# Copyright 2016-2019 Peter Dimov
-# 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)
-
-language: cpp
-
-dist: xenial
-
-branches:
-  only:
-    - master
-    - develop
-    - /feature\/.*/
-
-env:
-  matrix:
-    - BOGUS_JOB=true
-
-matrix:
-
-  exclude:
-    - env: BOGUS_JOB=true
-
-  include:
-    - os: linux
-      compiler: g++
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03,11
-
-    - os: linux
-      compiler: g++-4.4
-      env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=98,0x
-      addons:
-        apt:
-          packages:
-            - g++-4.4
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.6
-      env: TOOLSET=gcc COMPILER=g++-4.6 CXXSTD=03,0x
-      addons:
-        apt:
-          packages:
-            - g++-4.6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.7
-      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - g++-4.7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.8
-      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - g++-4.8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-4.9
-      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - g++-4.9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-5
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - g++-5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-6
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-7
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-8
-      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - g++-8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-9
-      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - g++-9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      dist: bionic
-      compiler: g++-10
-      env: TOOLSET=gcc COMPILER=g++-10 CXXSTD=03,11,14,17,20
-      addons:
-        apt:
-          packages:
-            - g++-10
-          sources:
-            - sourceline: "ppa:ubuntu-toolchain-r/test"
-
-    - os: linux
-      dist: bionic
-      compiler: g++-10
-      env: UBSAN=1 TOOLSET=gcc COMPILER=g++-10 CXXSTD=03,11,14,17,20 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
-      addons:
-        apt:
-          packages:
-            - g++-10
-          sources:
-            - sourceline: "ppa:ubuntu-toolchain-r/test"
-
-    - os: linux
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
-
-    - os: linux
-      dist: trusty
-      compiler: /usr/bin/clang++
-      env: TOOLSET=clang COMPILER=/usr/bin/clang++ CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - clang-3.3
-
-    - os: linux
-      dist: trusty
-      compiler: /usr/bin/clang++
-      env: TOOLSET=clang COMPILER=/usr/bin/clang++ CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - clang-3.4
-
-    - os: linux
-      dist: trusty
-      compiler: clang++-3.5
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - clang-3.5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-3.6
-      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-3.7
-      env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-3.8
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-3.9
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-4.0
-      env: TOOLSET=clang COMPILER=clang++-4.0 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-4.0
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-5.0
-      env: TOOLSET=clang COMPILER=clang++-5.0 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-5.0
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-6.0
-      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - clang-6.0
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++-7
-      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - clang-7
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-7
-
-    - os: linux
-      compiler: clang++-8
-      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - clang-8
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-8
-
-    - os: linux
-      compiler: clang++-9
-      env: TOOLSET=clang COMPILER=clang++-9 CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - clang-9
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-
-    - os: linux
-      compiler: clang++-10
-      env: TOOLSET=clang COMPILER=clang++-10 CXXSTD=03,11,14,17,20
-      addons:
-        apt:
-          packages:
-            - clang-10
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-
-    - os: linux
-      compiler: clang++-10
-      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-10 CXXSTD=03,11,14,17,20 UBSAN_OPTIONS=print_stacktrace=1
-      addons:
-        apt:
-          packages:
-            - clang-10
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-
-    - os: linux
-      dist: trusty
-      compiler: clang++-libc++
-      env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - libc++-dev
-            - libc++abi-dev
-
-    - os: linux
-      dist: trusty
-      compiler: clang++-libc++
-      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
-      addons:
-        apt:
-          packages:
-            - libc++-dev
-            - libc++abi-dev
-
-    - os: osx
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode7.3
-
-    - os: osx
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode8.3
-
-    - os: osx
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode9.4
-
-    - os: osx
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode10.1
-
-    - os: linux
-      env: CMAKE_TEST=1
-      script:
-        - mkdir __build__ && cd __build__
-        - cmake -DBOOST_ENABLE_CMAKE=1 -DBoost_VERBOSE=1 -DBOOST_INCLUDE_LIBRARIES=core ..
-        - ctest --output-on-failure -R boost_core
-
-    - os: linux
-      env: CMAKE_SUBDIR_TEST=1
-      install:
-        - BOOST_BRANCH=develop
-        - if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
-        - git clone -b $BOOST_BRANCH https://github.com/boostorg/config.git ../config
-        - git clone -b $BOOST_BRANCH https://github.com/boostorg/assert.git ../assert
-      script:
-      - cd test/cmake_subdir_test && mkdir __build__ && cd __build__
-      - cmake ..
-      - cmake --build .
-      - cmake --build . --target check
-
-    - os: linux
-      env: CMAKE_INSTALL_TEST=1
-      script:
-        - mkdir __build__ && cd __build__
-        - cmake -DBOOST_ENABLE_CMAKE=1 -DBoost_VERBOSE=1 -DBOOST_INCLUDE_LIBRARIES="assert;config;core" -DCMAKE_INSTALL_PREFIX=~/.local ..
-        - cmake --build . --target install
-        - cd ../libs/core/test/cmake_install_test && mkdir __build__ && cd __build__
-        - cmake -DCMAKE_INSTALL_PREFIX=~/.local ..
-        - cmake --build .
-        - cmake --build . --target check
-
-install:
-  - BOOST_BRANCH=develop
-  - if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
-  - cd ..
-  - git clone -b $BOOST_BRANCH https://github.com/boostorg/boost.git boost-root
-  - cd boost-root
-  - git submodule init libs/headers
-  - git submodule init libs/assert
-  - git submodule init libs/config
-  - git submodule init libs/predef
-  - git submodule init libs/static_assert
-  - git submodule init libs/throw_exception
-  - git submodule init libs/type_traits
-  - git submodule init tools/build
-  - git submodule init tools/boost_install
-  - git submodule init tools/cmake
-  - git submodule update --jobs 4
-  - cp -r $TRAVIS_BUILD_DIR/* libs/core
-  - ./bootstrap.sh
-  - ./b2 headers
-
-script:
-  - |-
-    echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
-  - ./b2 -j $BUILD_JOBS libs/core/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined define=UBSAN=1 debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
-
-notifications:
-  email:
-    on_success: always

CMakeLists.txt

@@ -17,13 +17,6 @@ target_link_libraries(boost_core
     Boost::config
 )
 
-if(BOOST_SUPERPROJECT_VERSION)
-
-  include(BoostInstall)
-  boost_install(TARGETS boost_core HEADER_DIRECTORY include/)
-
-endif()
-
 if(BUILD_TESTING)
 
   add_subdirectory(test)

README.md

@@ -8,12 +8,12 @@ The criteria for inclusion is that the utility component be:
 * used by other Boost libraries, and
 * not dependent on any other Boost modules except Core itself, Config, Assert, Static Assert, or Predef.
 
-### CI Status
+### Build Status
 
-Branch   | Travis | Appveyor
----------|--------|---------
-Develop  | [![Build Status](https://travis-ci.org/boostorg/core.svg?branch=develop)](https://travis-ci.org/boostorg/core) | [![Build Status](https://ci.appveyor.com/api/projects/status/github/boostorg/core?branch=develop&svg=true)](https://ci.appveyor.com/project/pdimov/core)
-Master   | [![Build Status](https://travis-ci.org/boostorg/core.svg?branch=master)](https://travis-ci.org/boostorg/core) | [![Build Status](https://ci.appveyor.com/api/projects/status/github/boostorg/core?branch=master&svg=true)](https://ci.appveyor.com/project/pdimov/core)
+Branch   | GitHub Actions | AppVeyor | Test Matrix | Dependencies |
+---------|----------------|--------- | ----------- | ------------ |
+Develop  | [![GitHub Actions](https://github.com/boostorg/core/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/filesystem/actions?query=branch%3Adevelop) | [![AppVeyor](https://ci.appveyor.com/api/projects/status/github/boostorg/core?branch=develop&svg=true)](https://ci.appveyor.com/project/pdimov/core) | [![Tests](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/core.html) | [![Dependencies](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/core.html)
+Master   | [![GitHub Actions](https://github.com/boostorg/core/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/filesystem/actions?query=branch%3Amaster) | [![AppVeyor](https://ci.appveyor.com/api/projects/status/github/boostorg/core?branch=master&svg=true)](https://ci.appveyor.com/project/pdimov/core) | [![Tests](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/core.html) | [![Dependencies](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/core.html)
 
 ### Directories
 

appveyor.yml

@@ -16,6 +16,7 @@ environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0
+      ADDRMD: 32
 
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-12.0,msvc-14.0
@@ -36,7 +37,7 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       TOOLSET: msvc-14.2
       ADDRMD: 32,64
-      CXXSTD: 14,17
+      CXXSTD: 14,17,latest
 
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;

doc/bit.qbk

@@ -0,0 +1,203 @@
+[/
+  Copyright 2020 Peter Dimov
+
+  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
+]
+
+[section:bit bit]
+
+[simplesect Authors]
+
+* Peter Dimov
+
+[endsimplesect]
+
+[section Header <boost/core/bit.hpp>]
+
+The header `<boost/core/bit.hpp>` implements, in a portable way,
+the C++20 `<bit>` header.
+
+[section Synopsis]
+
+``
+namespace boost
+{
+namespace core
+{
+
+// bit_cast
+
+template<class To, class From>
+To bit_cast(From const& from) noexcept;
+
+// Integral powers of 2
+
+template<class T>
+constexpr bool has_single_bit(T x) noexcept;
+
+template<class T>
+constexpr T bit_ceil(T x) noexcept;
+
+template<class T>
+constexpr T bit_floor(T x) noexcept;
+
+template<class T>
+constexpr T bit_width(T x) noexcept;
+
+// Rotating
+
+template<class T>
+constexpr T rotl(T x, int s) noexcept;
+
+template<class T>
+constexpr T rotr(T x, int s) noexcept;
+
+// Counting
+
+template<class T>
+constexpr int countl_zero(T x) noexcept;
+
+template<class T>
+constexpr int countl_one(T x) noexcept;
+
+template<class T>
+constexpr int countr_zero(T x) noexcept;
+
+template<class T>
+constexpr int countr_one(T x) noexcept;
+
+template<class T>
+constexpr int popcount(T x) noexcept;
+
+// Endian
+
+enum class endian
+{
+    little = see below,
+    big = see below,
+    native = see below
+};
+
+using endian_type = endian; // portable alias for C++03 code
+
+} // namespace core
+} // namespace boost
+``
+
+Note: even though the functions are shown as `constexpr` in the synopsis, since they are implemented
+via compiler-specific intrinsics, portable code cannot generally rely on their being usable in a
+constant expression context.
+
+[endsect]
+
+[section bit_cast]
+
+`template<class To, class From> To bit_cast(From const& from) noexcept;`
+
+* *Requires:* `To` and `From` must be trivially copyable and `sizeof(To)` must be the same as `sizeof(From)`.
+* *Returns:* A value of type `To` with the storage bytes copied from `from`.
+
+[endsect]
+
+[section Integral powers of 2]
+
+`template<class T> constexpr bool has_single_bit(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type (i.e. one of `unsigned char`, `unsigned short`, `unsigned int`, `unsigned long`, `unsigned long long`).
+* *Returns:* `true` if `x` is an integral power of two, `false` otherwise. (`has_single_bit(0u)` is false.)
+
+`template<class T> constexpr T bit_ceil(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The smallest integral power of 2 greater than or equal to `x`. If this value is not representable in `T`, behavior is undefined.
+
+`template<class T> constexpr T bit_floor(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* If `x == 0`, 0; otherwise the maximal value `y` such that `has_single_bit(y)` is `true` and `y <= x`.
+
+`template<class T> constexpr T bit_width(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* If `x == 0`, 0; otherwise one plus the base-2 logarithm of `x`, with any fractional part discarded.
+
+[endsect]
+
+[section Rotating]
+
+In the following descriptions, `N` denotes `numeric_limits<T>::digits` and `r` denotes `s % N`.
+
+`template<class T> constexpr T rotl(T x, int s) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* If `s` is negative, `rotr(x, -s)`; if `r` is 0, `x`; if `r` is positive, `(x << r) | (x >> (N - r))`.
+
+`template<class T> constexpr T rotr(T x, int s) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* If `s` is negative, `rotl(x, -s)`; if `r` is 0, `x`; if `r` is positive, `(x >> r) | (x << (N - r))`.
+
+[endsect]
+
+[section Counting]
+
+`template<class T> constexpr int countl_zero(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The number of consecutive 0 bits in the value of `x`, starting from the most significant ("left") bit.
+
+`template<class T> constexpr int countl_one(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The number of consecutive 1 bits in the value of `x`, starting from the most significant bit.
+
+`template<class T> constexpr int countr_zero(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The number of consecutive 0 bits in the value of `x`, starting from the least significant ("right") bit.
+
+`template<class T> constexpr int countr_one(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The number of consecutive 1 bits in the value of `x`, starting from the least significant bit.
+
+`template<class T> constexpr int popcount(T x) noexcept;`
+
+* *Requires:* `T` must be an unsigned integer type.
+* *Returns:* The number of 1 bits in the value of `x`.
+
+[endsect]
+
+[section Endian]
+
+Under C++11, `endian` is defined as `enum class endian` as shown in the synopsis. Under C++03, its definition is
+
+``
+namespace endian
+{
+enum type
+{
+    little = see below,
+    big = see below,
+    native = see below
+};
+}
+
+typedef endian::type endian_type;
+``
+
+The values of `endian::big` and `endian::little` are distinct. `endian::native` is equal to `endian::big` on
+big endian platforms, equal to `endian::little` on little endian platforms, and a distinct value on platforms
+that are neither.
+
+Note that you should not rely on `little` and `big` having any specific values, because the C++20 standard
+leaves these unspecified.
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/changes.qbk

@@ -0,0 +1,88 @@
+[/
+  Copyright 2021 Peter Dimov
+  Distributed under the Boost Software License, Version 1.0.
+  https://boost.org/LICENSE_1_0.txt)
+]
+
+[section Revision History]
+
+[section Changes in 1.78.0]
+
+* Added a generic implementation to `boost/core/cmath.hpp`, enabled when `BOOST_CORE_USE_GENERIC_CMATH`
+  is defined or when the platform does not provide the necessary facilities in `<cmath>`.
+* Added `boost::core::type_name`.
+
+[endsect]
+
+[section Changes in 1.77.0]
+
+* `boost/core/uncaught_exceptions.hpp` has been modified for compatibility with Mac OS 10.4 and older.
+
+[endsect]
+
+[section Changes in 1.76.0]
+
+* Add implicit conversion between compatible reference wrappers.
+* Add `boost/core/cmath.hpp`, a portable implementation of the floating point classification functions from `<cmath>`.
+* Add `boost/core/bit.hpp`, a portable implementation of the C++20 standard header `<bit>`.
+* Fix `BOOST_TEST_EQ`, `BOOST_TEST_NE` for character types under C++20.
+* Revise allocator access utilities (now support VS2013, and no workarounds use `allocator_traits`.)
+
+[endsect]
+
+[section Changes in 1.74.0]
+
+* Implemented the allocator access utilities which provide a replacement for `allocator_traits`
+  with individual traits and functions for each facility. They support the C++11 allocator model
+  when possible and provide a fallback for C++98 compatibility.
+
+[endsect]
+
+[section Changes in 1.71.0]
+
+* Added functions `alloc_construct`, `alloc_construct_n`, `alloc_destroy`, and `alloc_destroy_n`
+  in `<boost/core/alloc_construct.hpp>` for allocator aware and exception safe construction and
+  destruction of objects and arrays.
+* Added constexpr functions `first_scalar` in `<boost/core/first_scalar.hpp>` for obtaining a pointer
+  to the first scalar element of an array. Given a pointer of type `T*` they return a pointer of type
+  `remove_all_extents_t<T>*`.
+* Added class template `noinit_adaptor` in `<boost/core/noinit_adaptor.hpp>` which is an allocator adaptor
+  that converts any allocator into one whose `construct(ptr)` performs default initialization via placement
+  `new`, and whose `destroy(ptr)` invokes the `value_type` destructor directly.
+* Added class template `default_allocator` in `<boost/core/default_allocator.hpp>`, which can serve as a minimal
+  default allocator that has interface similar to C++20 `std::allocator`, supports configurations with disabled
+  exceptions and does not have `std` as an associated namespace. The allocator uses `operator new` and
+  `operator delete` for allocation.
+* In `<boost/core/uncaught_exceptions.hpp>` header, added workarounds for better compatibility with QNX SDP 7.0
+  when libc++/libc++abi libraries are used.
+* The `<boost/detail/sp_typeinfo.hpp>` header is now marked as deprecated and will be removed in a future release.
+  `<boost/core/typeinfo.hpp>` should be used instead.
+
+[endsect]
+
+[section Changes in 1.69.0]
+
+* Implemented `boost::empty_value`, for library authors to conveniently leverage the Empty Base Optimization to
+  store objects of potentially empty types.
+* Implemented `boost::quick_exit` to provide the C++11 standard library facility `std::quick_exit` functionality.
+* Reduced the number of statics in Lightweight Test, and employ lighter abort behavior for MSVC compilers upon
+  failure to call `boost::report_errors`.
+
+[endsect]
+
+[section Changes in 1.67.0]
+
+* Updated `to_address` and `pointer_traits` to reflect the design adopted for C++20 in
+  [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r2.html P0653R2].
+
+[endsect]
+
+[section Changes in 1.65.0]
+
+* Implemented `pointer_traits` for C++03 and higher, that implements
+  [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r0.html P0653r0].
+* Added `BOOST_TEST_GT` and `BOOST_TEST_GE` to Lightweight Test.
+
+[endsect]
+
+[endsect]

doc/cmath.qbk

@@ -0,0 +1,122 @@
+[/
+  Copyright 2018 Peter Dimov
+
+  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
+]
+
+[section:cmath cmath]
+
+[simplesect Authors]
+
+* Peter Dimov
+
+[endsimplesect]
+
+[section Header <boost/core/cmath.hpp>]
+
+The header `<boost/core/cmath.hpp>` defines, in a portable way, the floating
+point classification and sign manipulation functions from C++11.
+
+[section Synopsis]
+
+``
+namespace boost
+{
+namespace core
+{
+
+// fpclassify return values
+
+int const fp_zero = /*unspecified*/;
+int const fp_subnormal = /*unspecified*/;
+int const fp_normal = /*unspecified*/;
+int const fp_infinite = /*unspecified*/;
+int const fp_nan = /*unspecified*/;
+
+// Classification functions
+
+template<class T> bool isfinite( T x );
+template<class T> bool isnan( T x );
+template<class T> bool isinf( T x );
+template<class T> bool isnormal( T x );
+template<class T> int fpclassify( T x );
+
+// Sign manipulation functions
+
+template<class T> bool signbit( T x );
+template<class T> T copysign( T x, T y );
+
+} // namespace core
+} // namespace boost
+``
+
+[endsect]
+
+[section Classification Functions]
+
+[section template<class T> bool isfinite( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `true` when `x` is finite (not infinity or NaN), `false` otherwise.
+
+[endsect]
+
+[section template<class T> bool isnan( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `true` when `x` is NaN, `false` otherwise.
+
+[endsect]
+
+[section template<class T> bool isinf( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `true` when `x` is infinity, `false` otherwise.
+
+[endsect]
+
+[section template<class T> bool isnormal( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `true` when `x` is a normal number (not zero, subnormal, infinity, or NaN), `false` otherwise.
+
+[endsect]
+
+[section template<class T> int fpclassify( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:*
+  * `fp_zero` when `x` is zero;
+  * `fp_subnormal` when `x` is subnormal;
+  * `fp_infinite` when `x` is infinity;
+  * `fp_nan` when `x` is NaN;
+  * `fp_normal` otherwise.
+
+[endsect]
+
+[endsect]
+
+[section Sign Manipulation Functions]
+
+[section template<class T> bool signbit( T x );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `true` when `x` is negative, `false` otherwise.
+
+[endsect]
+
+[section template<class T> bool copysign( T x, T y );]
+
+* *Requires:* `T` must be `float`, `double`, or `long double`.
+* *Returns:* `x` with the sign copied from `y`.
+
+[endsect]
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/core.qbk

@@ -38,10 +38,14 @@ criteria for inclusion is that the utility component be:
 
 [endsect]
 
+[include changes.qbk]
+
 [include addressof.qbk]
 [include allocator_access.qbk]
 [include alloc_construct.qbk]
+[include bit.qbk]
 [include checked_delete.qbk]
+[include cmath.qbk]
 [include default_allocator.qbk]
 [include demangle.qbk]
 [include empty_value.qbk]
@@ -63,5 +67,6 @@ criteria for inclusion is that the utility component be:
 [include scoped_enum.qbk]
 [include swap.qbk]
 [include typeinfo.qbk]
+[include type_name.qbk]
 [include uncaught_exceptions.qbk]
 [include use_default.qbk]

doc/type_name.qbk

@@ -0,0 +1,77 @@
+[/
+  Copyright 2021 Peter Dimov
+  Distributed under the Boost Software License, Version 1.0.
+  https://boost.org/LICENSE_1_0.txt
+]
+
+[section:type_name type_name]
+
+[simplesect Authors]
+
+* Peter Dimov
+
+[endsimplesect]
+
+[section Header <boost/core/type_name.hpp>]
+
+The header `<boost/core/type_name.hpp>` defines the function
+template `boost::core::type_name<T>()` that returns a string
+representation of the name of `T`, suitable for logging or
+diagnostic display purposes.
+
+The result is similar to `boost::core::demangle( typeid(T).name() )`,
+but it's made more regular by eliminating some of the platform-specific
+differences and extra template parameters of the standard library
+container types.
+
+For example, `type_name< std::map<std::string, int> >()` returns
+`"std::map<std::string, int>"` and not
+
+```
+  std::map<std::__cxx11::basic_string<char, std::char_traits<char>,
+    std::allocator<char> >, int, std::less<std::__cxx11::basic_string<char,
+    std::char_traits<char>, std::allocator<char> > >, std::allocator<
+    std::pair<std::__cxx11::basic_string<char, std::char_traits<char>,
+    std::allocator<char> > const, int> > >
+```
+
+or
+
+```
+  class std::map<class std::basic_string<char,struct std::char_traits<char>,
+    class std::allocator<char> >,int,struct std::less<class std::basic_string<
+    char,struct std::char_traits<char>,class std::allocator<char> > >,class
+    std::allocator<struct std::pair<class std::basic_string<char,struct
+    std::char_traits<char>,class std::allocator<char> > const ,int> > >
+```
+
+The return values aren't guaranteed to be stable across Boost releases.
+
+Compilation with `-fno-rtti` is supported, but the returned type names aren't
+guaranteed to be particularly useful or unique.
+
+[section Synopsis]
+
+``
+namespace boost
+{
+namespace core
+{
+
+template<class T> std::string type_name();
+
+} // namespace core
+} // namespace boost
+``
+
+[endsect]
+
+[section template<class T> std::string type_name();]
+
+* *Returns:* A string representation of the name of `T`.
+
+[endsect]
+
+[endsect]
+
+[endsect]

include/boost/core/allocator_access.hpp

@@ -1,5 +1,5 @@
 /*
-Copyright 2020 Glen Joseph Fernandes
+Copyright 2020-2021 Glen Joseph Fernandes
 (glenjofe@gmail.com)
 
 Distributed under the Boost Software License, Version 1.0.
@@ -11,11 +11,7 @@ Distributed under the Boost Software License, Version 1.0.
 #include <boost/config.hpp>
 #if !defined(BOOST_NO_CXX11_ALLOCATOR)
 #include <boost/core/pointer_traits.hpp>
-#if !defined(BOOST_MSVC)
 #include <limits>
-#else
-#include <memory>
-#endif
 #include <type_traits>
 #endif
 #include <new>
@@ -23,21 +19,18 @@ Distributed under the Boost Software License, Version 1.0.
 #include <utility>
 #endif
 
-namespace boost {
-namespace detail {
-
-#if defined(BOOST_NO_CXX11_ALLOCATOR)
-struct alloc_false {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
-#else
-template<class>
-struct alloc_void {
-    typedef void type;
-};
+#if defined(_LIBCPP_SUPPRESS_DEPRECATED_PUSH)
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
+#endif
+#if defined(_STL_DISABLE_DEPRECATED_WARNING)
+_STL_DISABLE_DEPRECATED_WARNING
+#endif
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable:4996)
 #endif
 
-} /* detail */
+namespace boost {
 
 template<class A>
 struct allocator_value_type {
@@ -49,17 +42,21 @@ template<class A>
 struct allocator_pointer {
     typedef typename A::pointer type;
 };
-#elif defined(BOOST_MSVC)
-template<class A>
-struct allocator_pointer {
-    typedef typename std::allocator_traits<A>::pointer type;
-};
 #else
 template<class A, class = void>
 struct allocator_pointer {
     typedef typename A::value_type* type;
 };
 
+namespace detail {
+
+template<class>
+struct alloc_void {
+    typedef void type;
+};
+
+} /* detail */
+
 template<class A>
 struct allocator_pointer<A,
     typename detail::alloc_void<typename A::pointer>::type> {
@@ -72,11 +69,6 @@ template<class A>
 struct allocator_const_pointer {
     typedef typename A::const_pointer type;
 };
-#elif defined(BOOST_MSVC)
-template<class A>
-struct allocator_const_pointer {
-    typedef typename std::allocator_traits<A>::const_pointer type;
-};
 #else
 template<class A, class = void>
 struct allocator_const_pointer {
@@ -137,11 +129,6 @@ template<class A>
 struct allocator_difference_type {
     typedef typename A::difference_type type;
 };
-#elif defined(BOOST_MSVC)
-template<class A>
-struct allocator_difference_type {
-    typedef typename std::allocator_traits<A>::difference_type type;
-};
 #else
 template<class A, class = void>
 struct allocator_difference_type {
@@ -161,11 +148,6 @@ template<class A>
 struct allocator_size_type {
     typedef typename A::size_type type;
 };
-#elif defined(BOOST_MSVC)
-template<class A>
-struct allocator_size_type {
-    typedef typename std::allocator_traits<A>::size_type type;
-};
 #else
 template<class A, class = void>
 struct allocator_size_type {
@@ -181,6 +163,14 @@ struct allocator_size_type<A,
 #endif
 
 #if defined(BOOST_NO_CXX11_ALLOCATOR)
+namespace detail {
+
+struct alloc_false {
+    BOOST_STATIC_CONSTEXPR bool value = false;
+};
+
+} /* detail */
+
 template<class A>
 struct allocator_propagate_on_container_copy_assignment {
     typedef detail::alloc_false type;
@@ -260,11 +250,6 @@ template<class A, class T>
 struct allocator_rebind {
     typedef typename A::template rebind<T>::other type;
 };
-#elif defined(BOOST_MSVC)
-template<class A, class T>
-struct allocator_rebind {
-    typedef typename std::allocator_traits<A>::template rebind_alloc<T> type;
-};
 #else
 namespace detail {
 
@@ -313,36 +298,31 @@ allocator_allocate(A& a, typename allocator_size_type<A>::type n,
 {
     return a.allocate(n, h);
 }
-#elif defined(BOOST_MSVC)
-template<class A>
-inline typename allocator_pointer<A>::type
-allocator_allocate(A& a, typename allocator_size_type<A>::type n,
-    typename allocator_const_void_pointer<A>::type h)
-{
-    return std::allocator_traits<A>::allocate(a, n, h);
-}
 #else
 namespace detail {
 
-template<class, class, class, class = void>
-struct alloc_has_allocate {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
+struct alloc_none { };
 
-template<class A, class N, class H>
-struct alloc_has_allocate<A, N, H,
-    typename alloc_void<decltype(std::declval<A&>().allocate(std::declval<N>(),
-        std::declval<H>()))>::type> {
-    BOOST_STATIC_CONSTEXPR bool value = true;
+template<class A>
+class alloc_has_allocate {
+    template<class O>
+    static auto check(int) -> decltype(std::declval<O&>().allocate(
+        std::declval<typename allocator_size_type<A>::type>(),
+        std::declval<typename allocator_const_void_pointer<A>::type>()));
+
+    template<class>
+    static alloc_none check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value =
+        !std::is_same<decltype(check<A>(0)), alloc_none>::value;
 };
 
 } /* detail */
 
 template<class A>
-inline typename std::enable_if<detail::alloc_has_allocate<A,
-    typename allocator_size_type<A>::type,
-        typename allocator_const_void_pointer<A>::type>::value,
-            typename allocator_pointer<A>::type>::type
+inline typename std::enable_if<detail::alloc_has_allocate<A>::value,
+    typename allocator_pointer<A>::type>::type
 allocator_allocate(A& a, typename allocator_size_type<A>::type n,
     typename allocator_const_void_pointer<A>::type h)
 {
@@ -350,10 +330,8 @@ allocator_allocate(A& a, typename allocator_size_type<A>::type n,
 }
 
 template<class A>
-inline typename std::enable_if<!detail::alloc_has_allocate<A,
-    typename allocator_size_type<A>::type,
-        typename allocator_const_void_pointer<A>::type>::value,
-            typename allocator_pointer<A>::type>::type
+inline typename std::enable_if<!detail::alloc_has_allocate<A>::value,
+    typename allocator_pointer<A>::type>::type
 allocator_allocate(A& a, typename allocator_size_type<A>::type n,
     typename allocator_const_void_pointer<A>::type)
 {
@@ -400,32 +378,28 @@ allocator_construct(A&, T* p, V& v)
     ::new((void*)p) T(v);
 }
 #endif
-#elif defined(BOOST_MSVC)
-template<class A, class T, class... Args>
-inline void
-allocator_construct(A& a, T* p, Args&&... args)
-{
-    std::allocator_traits<A>::construct(a, p, std::forward<Args>(args)...);
-}
 #else
 namespace detail {
 
-template<class, class, class, class...>
-struct alloc_has_construct {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
-
 template<class A, class T, class... Args>
-struct alloc_has_construct<typename alloc_void<decltype(std::declval<A
-    &>().construct(std::declval<T*>(), std::declval<Args&&>()...))>::type,
-        A, T, Args...> {
-    BOOST_STATIC_CONSTEXPR bool value = true;
+class alloc_has_construct {
+    template<class O>
+    static auto check(int)
+    -> decltype(std::declval<O&>().construct(std::declval<T*>(),
+        std::declval<Args&&>()...));
+
+    template<class>
+    static alloc_none check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value =
+        !std::is_same<decltype(check<A>(0)), alloc_none>::value;
 };
 
 } /* detail */
 
 template<class A, class T, class... Args>
-inline typename std::enable_if<detail::alloc_has_construct<void, A, T,
+inline typename std::enable_if<detail::alloc_has_construct<A, T,
     Args...>::value>::type
 allocator_construct(A& a, T* p, Args&&... args)
 {
@@ -433,7 +407,7 @@ allocator_construct(A& a, T* p, Args&&... args)
 }
 
 template<class A, class T, class... Args>
-inline typename std::enable_if<!detail::alloc_has_construct<void, A, T,
+inline typename std::enable_if<!detail::alloc_has_construct<A, T,
     Args...>::value>::type
 allocator_construct(A&, T* p, Args&&... args)
 {
@@ -449,26 +423,21 @@ allocator_destroy(A&, T* p)
     p->~T();
     (void)p;
 }
-#elif defined(BOOST_MSVC)
-template<class A, class T>
-inline void
-allocator_destroy(A& a, T* p)
-{
-    std::allocator_traits<A>::destroy(a, p);
-}
 #else
 namespace detail {
 
-template<class, class, class = void>
-struct alloc_has_destroy {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
-
 template<class A, class T>
-struct alloc_has_destroy<A, T,
-    typename alloc_void<decltype(std::declval<A
-        &>().destroy(std::declval<T*>()))>::type> {
-    BOOST_STATIC_CONSTEXPR bool value = true;
+class alloc_has_destroy {
+    template<class O>
+    static auto check(int)
+    -> decltype(std::declval<O&>().destroy(std::declval<T*>()));
+
+    template<class>
+    static alloc_none check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value =
+        !std::is_same<decltype(check<A>(0)), alloc_none>::value;
 };
 
 } /* detail */
@@ -496,26 +465,20 @@ allocator_max_size(const A& a)
 {
     return a.max_size();
 }
-#elif defined(BOOST_MSVC)
-template<class A>
-inline typename allocator_size_type<A>::type
-allocator_max_size(const A& a)
-{
-    return std::allocator_traits<A>::max_size(a);
-}
 #else
 namespace detail {
 
-template<class, class = void>
-struct alloc_has_max_size {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
-
 template<class A>
-struct alloc_has_max_size<A,
-    typename alloc_void<decltype(std::declval<const
-        A&>().max_size())>::type> {
-    BOOST_STATIC_CONSTEXPR bool value = true;
+class alloc_has_max_size {
+    template<class O>
+    static auto check(int) -> decltype(std::declval<O&>().max_size());
+
+    template<class>
+    static alloc_none check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value =
+        !std::is_same<decltype(check<A>(0)), alloc_none>::value;
 };
 
 } /* detail */
@@ -545,26 +508,21 @@ allocator_select_on_container_copy_construction(const A& a)
 {
     return a;
 }
-#elif defined(BOOST_MSVC)
-template<class A>
-inline A
-allocator_select_on_container_copy_construction(const A& a)
-{
-    return std::allocator_traits<A>::select_on_container_copy_construction(a);
-}
 #else
 namespace detail {
 
-template<class, class = void>
-struct alloc_has_soccc {
-    BOOST_STATIC_CONSTEXPR bool value = false;
-};
-
 template<class A>
-struct alloc_has_soccc<A,
-    typename alloc_void<decltype(std::declval<const
-        A&>().select_on_container_copy_construction())>::type> {
-    BOOST_STATIC_CONSTEXPR bool value = true;
+class alloc_has_soccc {
+    template<class O>
+    static auto check(int)
+    -> decltype(std::declval<O&>().select_on_container_copy_construction());
+
+    template<class>
+    static alloc_none check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value =
+        !std::is_same<decltype(check<A>(0)), alloc_none>::value;
 };
 
 } /* detail */
@@ -630,4 +588,14 @@ using allocator_rebind_t = typename allocator_rebind<A, T>::type;
 
 } /* boost */
 
+#if defined(_LIBCPP_SUPPRESS_DEPRECATED_POP)
+_LIBCPP_SUPPRESS_DEPRECATED_POP
+#endif
+#if defined(_STL_RESTORE_DEPRECATED_WARNING)
+_STL_RESTORE_DEPRECATED_WARNING
+#endif
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
 #endif

include/boost/core/bit.hpp

@@ -0,0 +1,581 @@
+#ifndef BOOST_CORE_BIT_HPP_INCLUDED
+#define BOOST_CORE_BIT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+// boost/core/bit.hpp
+//
+// A portable version of the C++20 standard header <bit>
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+#include <cstring>
+
+#if defined(_MSC_VER)
+# include <intrin.h>
+# pragma intrinsic(_BitScanForward)
+# pragma intrinsic(_BitScanReverse)
+# if defined(_M_X64)
+#  pragma intrinsic(_BitScanForward64)
+#  pragma intrinsic(_BitScanReverse64)
+# endif
+#endif // defined(_MSC_VER)
+
+namespace boost
+{
+namespace core
+{
+
+// bit_cast
+
+template<class To, class From>
+To bit_cast( From const & from ) BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT( sizeof(To) == sizeof(From) );
+
+    To to;
+    std::memcpy( &to, &from, sizeof(To) );
+    return to;
+}
+
+// countl
+
+#if defined(__GNUC__) || defined(__clang__)
+
+namespace detail
+{
+
+BOOST_CONSTEXPR inline int countl_impl( unsigned char x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clz( x ) - ( std::numeric_limits<unsigned int>::digits - std::numeric_limits<unsigned char>::digits ): std::numeric_limits<unsigned char>::digits;
+}
+
+BOOST_CONSTEXPR inline int countl_impl( unsigned short x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clz( x ) - ( std::numeric_limits<unsigned int>::digits - std::numeric_limits<unsigned short>::digits ): std::numeric_limits<unsigned short>::digits;
+}
+
+BOOST_CONSTEXPR inline int countl_impl( unsigned int x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clz( x ): std::numeric_limits<unsigned int>::digits;
+}
+
+BOOST_CONSTEXPR inline int countl_impl( unsigned long x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clzl( x ): std::numeric_limits<unsigned long>::digits;
+}
+
+BOOST_CONSTEXPR inline int countl_impl( unsigned long long x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clzll( x ): std::numeric_limits<unsigned long long>::digits;
+}
+
+} // namespace detail
+
+template<class T>
+BOOST_CONSTEXPR int countl_zero( T x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countl_impl( x );
+}
+
+#else // defined(__GNUC__) || defined(__clang__)
+
+namespace detail
+{
+
+inline int countl_impl( boost::uint32_t x ) BOOST_NOEXCEPT
+{
+#if defined(_MSC_VER)
+
+    unsigned long r;
+
+    if( _BitScanReverse( &r, x ) )
+    {
+        return 31 - static_cast<int>( r );
+    }
+    else
+    {
+        return 32;
+    }
+
+#else
+
+    static unsigned char const mod37[ 37 ] = { 32, 31, 6, 30, 9, 5, 0, 29, 16, 8, 2, 4, 21, 0, 19, 28, 25, 15, 0, 7, 10, 1, 17, 3, 22, 20, 26, 0, 11, 18, 23, 27, 12, 24, 13, 14, 0 };
+
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+
+    return mod37[ x % 37 ];
+
+#endif
+}
+
+inline int countl_impl( boost::uint64_t x ) BOOST_NOEXCEPT
+{
+#if defined(_MSC_VER) && defined(_M_X64)
+
+    unsigned long r;
+
+    if( _BitScanReverse64( &r, x ) )
+    {
+        return 63 - static_cast<int>( r );
+    }
+    else
+    {
+        return 64;
+    }
+
+#else
+
+    return static_cast<boost::uint32_t>( x >> 32 ) != 0?
+        boost::core::detail::countl_impl( static_cast<boost::uint32_t>( x >> 32 ) ):
+        boost::core::detail::countl_impl( static_cast<boost::uint32_t>( x ) ) + 32;
+
+#endif
+}
+
+inline int countl_impl( boost::uint8_t x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countl_impl( static_cast<boost::uint32_t>( x ) ) - 24;
+}
+
+inline int countl_impl( boost::uint16_t x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countl_impl( static_cast<boost::uint32_t>( x ) ) - 16;
+}
+
+} // namespace detail
+
+template<class T>
+int countl_zero( T x ) BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT( sizeof(T) == sizeof(boost::uint8_t) || sizeof(T) == sizeof(boost::uint16_t) || sizeof(T) == sizeof(boost::uint32_t) || sizeof(T) == sizeof(boost::uint64_t) );
+
+    if( sizeof(T) == sizeof(boost::uint8_t) )
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint8_t>( x ) );
+    }
+    else if( sizeof(T) == sizeof(boost::uint16_t) )
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint16_t>( x ) );
+    }
+    else if( sizeof(T) == sizeof(boost::uint32_t) )
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint32_t>( x ) );
+    }
+    else
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint64_t>( x ) );
+    }
+}
+
+#endif // defined(__GNUC__) || defined(__clang__)
+
+template<class T>
+BOOST_CONSTEXPR int countl_one( T x ) BOOST_NOEXCEPT
+{
+    return boost::core::countl_zero( static_cast<T>( ~x ) );
+}
+
+// countr
+
+#if defined(__GNUC__) || defined(__clang__)
+
+namespace detail
+{
+
+BOOST_CONSTEXPR inline int countr_impl( unsigned char x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctz( x ): std::numeric_limits<unsigned char>::digits;
+}
+
+BOOST_CONSTEXPR inline int countr_impl( unsigned short x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctz( x ): std::numeric_limits<unsigned short>::digits;
+}
+
+BOOST_CONSTEXPR inline int countr_impl( unsigned int x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctz( x ): std::numeric_limits<unsigned int>::digits;
+}
+
+BOOST_CONSTEXPR inline int countr_impl( unsigned long x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctzl( x ): std::numeric_limits<unsigned long>::digits;
+}
+
+BOOST_CONSTEXPR inline int countr_impl( unsigned long long x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctzll( x ): std::numeric_limits<unsigned long long>::digits;
+}
+
+} // namespace detail
+
+template<class T>
+BOOST_CONSTEXPR int countr_zero( T x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countr_impl( x );
+}
+
+#else // defined(__GNUC__) || defined(__clang__)
+
+namespace detail
+{
+
+inline int countr_impl( boost::uint32_t x ) BOOST_NOEXCEPT
+{
+#if defined(_MSC_VER)
+
+    unsigned long r;
+
+    if( _BitScanForward( &r, x ) )
+    {
+        return static_cast<int>( r );
+    }
+    else
+    {
+        return 32;
+    }
+
+#else
+
+    static unsigned char const mod37[ 37 ] = { 32, 0, 1, 26, 2, 23, 27, 0, 3, 16, 24, 30, 28, 11, 0, 13, 4, 7, 17, 0, 25, 22, 31, 15, 29, 10, 12, 6, 0, 21, 14, 9, 5, 20, 8, 19, 18 };
+    return mod37[ ( -(boost::int32_t)x & x ) % 37 ];
+
+#endif
+}
+
+inline int countr_impl( boost::uint64_t x ) BOOST_NOEXCEPT
+{
+#if defined(_MSC_VER) && defined(_M_X64)
+
+    unsigned long r;
+
+    if( _BitScanForward64( &r, x ) )
+    {
+        return static_cast<int>( r );
+    }
+    else
+    {
+        return 64;
+    }
+
+#else
+
+    return static_cast<boost::uint32_t>( x ) != 0?
+        boost::core::detail::countr_impl( static_cast<boost::uint32_t>( x ) ):
+        boost::core::detail::countr_impl( static_cast<boost::uint32_t>( x >> 32 ) ) + 32;
+
+#endif
+}
+
+inline int countr_impl( boost::uint8_t x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countr_impl( static_cast<boost::uint32_t>( x ) | 0x100 );
+}
+
+inline int countr_impl( boost::uint16_t x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::countr_impl( static_cast<boost::uint32_t>( x ) | 0x10000 );
+}
+
+} // namespace detail
+
+template<class T>
+int countr_zero( T x ) BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT( sizeof(T) == sizeof(boost::uint8_t) || sizeof(T) == sizeof(boost::uint16_t) || sizeof(T) == sizeof(boost::uint32_t) || sizeof(T) == sizeof(boost::uint64_t) );
+
+    if( sizeof(T) == sizeof(boost::uint8_t) )
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint8_t>( x ) );
+    }
+    else if( sizeof(T) == sizeof(boost::uint16_t) )
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint16_t>( x ) );
+    }
+    else if( sizeof(T) == sizeof(boost::uint32_t) )
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint32_t>( x ) );
+    }
+    else
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint64_t>( x ) );
+    }
+}
+
+#endif // defined(__GNUC__) || defined(__clang__)
+
+template<class T>
+BOOST_CONSTEXPR int countr_one( T x ) BOOST_NOEXCEPT
+{
+    return boost::core::countr_zero( static_cast<T>( ~x ) );
+}
+
+// popcount
+
+#if defined(__GNUC__) || defined(__clang__)
+
+#if defined(__clang__) && __clang_major__ * 100 + __clang_minor__ < 304
+# define BOOST_CORE_POPCOUNT_CONSTEXPR
+#else
+# define BOOST_CORE_POPCOUNT_CONSTEXPR BOOST_CONSTEXPR
+#endif
+
+namespace detail
+{
+
+BOOST_CORE_POPCOUNT_CONSTEXPR inline int popcount_impl( unsigned char x ) BOOST_NOEXCEPT
+{
+    return __builtin_popcount( x );
+}
+
+BOOST_CORE_POPCOUNT_CONSTEXPR inline int popcount_impl( unsigned short x ) BOOST_NOEXCEPT
+{
+    return __builtin_popcount( x );
+}
+
+BOOST_CORE_POPCOUNT_CONSTEXPR inline int popcount_impl( unsigned int x ) BOOST_NOEXCEPT
+{
+    return __builtin_popcount( x );
+}
+
+BOOST_CORE_POPCOUNT_CONSTEXPR inline int popcount_impl( unsigned long x ) BOOST_NOEXCEPT
+{
+    return __builtin_popcountl( x );
+}
+
+BOOST_CORE_POPCOUNT_CONSTEXPR inline int popcount_impl( unsigned long long x ) BOOST_NOEXCEPT
+{
+    return __builtin_popcountll( x );
+}
+
+} // namespace detail
+
+#undef BOOST_CORE_POPCOUNT_CONSTEXPR
+
+template<class T>
+BOOST_CONSTEXPR int popcount( T x ) BOOST_NOEXCEPT
+{
+    return boost::core::detail::popcount_impl( x );
+}
+
+#else // defined(__GNUC__) || defined(__clang__)
+
+namespace detail
+{
+
+BOOST_CXX14_CONSTEXPR inline int popcount_impl( boost::uint32_t x ) BOOST_NOEXCEPT
+{
+    x = x - ( ( x >> 1 ) & 0x55555555 );
+    x = ( x & 0x33333333 ) + ( ( x >> 2 ) & 0x33333333 );
+    x = ( x + ( x >> 4 ) ) & 0x0F0F0F0F;
+
+    return static_cast<unsigned>( ( x * 0x01010101 ) >> 24 );
+}
+
+BOOST_CXX14_CONSTEXPR inline int popcount_impl( boost::uint64_t x ) BOOST_NOEXCEPT
+{
+    x = x - ( ( x >> 1 ) & 0x5555555555555555 );
+    x = ( x & 0x3333333333333333 ) + ( ( x >> 2 ) & 0x3333333333333333 );
+    x = ( x + ( x >> 4 ) ) & 0x0F0F0F0F0F0F0F0F;
+
+    return static_cast<unsigned>( ( x * 0x0101010101010101 ) >> 56 );
+}
+
+} // namespace detail
+
+template<class T>
+BOOST_CXX14_CONSTEXPR int popcount( T x ) BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT( sizeof(T) <= sizeof(boost::uint64_t) );
+
+    if( sizeof(T) <= sizeof(boost::uint32_t) )
+    {
+        return boost::core::detail::popcount_impl( static_cast<boost::uint32_t>( x ) );
+    }
+    else
+    {
+        return boost::core::detail::popcount_impl( static_cast<boost::uint64_t>( x ) );
+    }
+}
+
+#endif // defined(__GNUC__) || defined(__clang__)
+
+// rotating
+
+template<class T>
+BOOST_CXX14_CONSTEXPR T rotl( T x, int s ) BOOST_NOEXCEPT
+{
+    unsigned const mask = std::numeric_limits<T>::digits - 1;
+    return x << (s & mask) | x >> ((-s) & mask);
+}
+
+template<class T>
+BOOST_CXX14_CONSTEXPR T rotr( T x, int s ) BOOST_NOEXCEPT
+{
+    unsigned const mask = std::numeric_limits<T>::digits - 1;
+    return x >> (s & mask) | x << ((-s) & mask);
+}
+
+// integral powers of 2
+
+template<class T>
+BOOST_CONSTEXPR bool has_single_bit( T x ) BOOST_NOEXCEPT
+{
+    return x != 0 && ( x & ( x - 1 ) ) == 0;
+}
+
+template<class T>
+BOOST_CONSTEXPR T bit_width( T x ) BOOST_NOEXCEPT
+{
+    return std::numeric_limits<T>::digits - boost::core::countl_zero( x );
+}
+
+template<class T>
+BOOST_CONSTEXPR T bit_floor( T x ) BOOST_NOEXCEPT
+{
+    return x == 0? 0: T(1) << ( boost::core::bit_width( x ) - 1 );
+}
+
+namespace detail
+{
+
+BOOST_CXX14_CONSTEXPR inline boost::uint32_t bit_ceil_impl( boost::uint32_t x ) BOOST_NOEXCEPT
+{
+    if( x == 0 )
+    {
+        return 0;
+    }
+
+    --x;
+
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+
+    ++x;
+
+    return x;
+}
+
+BOOST_CXX14_CONSTEXPR inline boost::uint64_t bit_ceil_impl( boost::uint64_t x ) BOOST_NOEXCEPT
+{
+    if( x == 0 )
+    {
+        return 0;
+    }
+
+    --x;
+
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+    x |= x >> 32;
+
+    ++x;
+
+    return x;
+}
+
+} // namespace detail
+
+template<class T>
+BOOST_CXX14_CONSTEXPR T bit_ceil( T x ) BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT( sizeof(T) <= sizeof(boost::uint64_t) );
+
+    if( sizeof(T) <= sizeof(boost::uint32_t) )
+    {
+        return static_cast<T>( boost::core::detail::bit_ceil_impl( static_cast<boost::uint32_t>( x ) ) );
+    }
+    else
+    {
+        return static_cast<T>( boost::core::detail::bit_ceil_impl( static_cast<boost::uint64_t>( x ) ) );
+    }
+}
+
+// endian
+
+#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER =little
+
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER =big
+
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_PDP_ENDIAN__) && __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER
+
+#elif defined(__LITTLE_ENDIAN__)
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER =little
+
+#elif defined(__BIG_ENDIAN__)
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER =big
+
+#elif defined(_MSC_VER) || defined(__i386__) || defined(__x86_64__)
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER =little
+
+#else
+
+# define BOOST_CORE_BIT_NATIVE_INITIALIZER
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+enum class endian
+{
+    big,
+    little,
+    native BOOST_CORE_BIT_NATIVE_INITIALIZER
+};
+
+typedef endian endian_type;
+
+#else
+
+namespace endian
+{
+
+enum type
+{
+    big,
+    little,
+    native BOOST_CORE_BIT_NATIVE_INITIALIZER
+};
+
+} // namespace endian
+
+typedef endian::type endian_type;
+
+#endif
+
+#undef BOOST_CORE_BIT_NATIVE_INITIALIZER
+
+} // namespace core
+} // namespace boost
+
+#endif  // #ifndef BOOST_CORE_BIT_HPP_INCLUDED

include/boost/core/cmath.hpp

@@ -0,0 +1,298 @@
+#ifndef BOOST_CORE_CMATH_HPP_INCLUDED
+#define BOOST_CORE_CMATH_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+// boost/core/cmath.hpp
+//
+// Floating point classification and sign manipulation functions
+// Extracted from https://github.com/boostorg/lexical_cast/pull/37
+//
+// Copyright 2020, 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <cmath>
+
+#if defined(BOOST_CORE_USE_GENERIC_CMATH) || (!defined(_MSC_VER) && !defined(FP_SUBNORMAL))
+
+#include <boost/cstdint.hpp>
+#include <boost/static_assert.hpp>
+#include <limits>
+#include <cstring>
+
+namespace boost
+{
+namespace core
+{
+
+// fpclassify return values
+
+int const fp_zero = 0;
+int const fp_subnormal = 1;
+int const fp_normal = 2;
+int const fp_infinite = 3;
+int const fp_nan = 4;
+
+// Classification functions
+
+template<class T> bool isfinite( T x )
+{
+    return x <= (std::numeric_limits<T>::max)() && x >= -(std::numeric_limits<T>::max)();
+}
+
+template<class T> bool isinf( T x )
+{
+    return x > (std::numeric_limits<T>::max)() || x < -(std::numeric_limits<T>::max)();
+}
+
+template<class T> bool isnan( T x )
+{
+    return !isfinite( x ) && !isinf( x );
+}
+
+template<class T> bool isnormal( T x )
+{
+    return isfinite( x ) && ( x >= (std::numeric_limits<T>::min)() || x <= -(std::numeric_limits<T>::min)() );
+}
+
+template<class T> int fpclassify( T x )
+{
+    if( x == 0 ) return fp_zero;
+
+    if( x < 0 ) x = -x;
+
+    if( x > (std::numeric_limits<T>::max)() ) return fp_infinite;
+
+    if( x >= (std::numeric_limits<T>::min)() ) return fp_normal;
+
+    if( x < (std::numeric_limits<T>::min)() ) return fp_subnormal;
+
+    return fp_nan;
+}
+
+// Sign manipulation functions
+
+inline bool signbit( float x )
+{
+    boost::int32_t y;
+
+    BOOST_STATIC_ASSERT( sizeof( x ) == sizeof( y ) );
+
+    std::memcpy( &y, &x, sizeof( y ) );
+
+    return y < 0;
+}
+
+inline bool signbit( double x )
+{
+    boost::int64_t y;
+
+    BOOST_STATIC_ASSERT( sizeof( x ) == sizeof( y ) );
+
+    std::memcpy( &y, &x, sizeof( y ) );
+
+    return y < 0;
+}
+
+inline bool signbit( long double x )
+{
+    return signbit( static_cast<double>( x ) );
+}
+
+template<class T> T copysign( T x, T y )
+{
+    return signbit( x ) == signbit( y )? x: -x;
+}
+
+} // namespace core
+} // namespace boost
+
+#else // defined(BOOST_CORE_USE_GENERIC_CMATH)
+
+#if defined(_MSC_VER) && _MSC_VER < 1800
+# include <float.h>
+#endif
+
+namespace boost
+{
+namespace core
+{
+#if defined(_MSC_VER) && _MSC_VER < 1800
+
+template<class T> T copysign( T x, T y )
+{
+    return static_cast<T>( _copysign( static_cast<double>( x ), static_cast<double>( y ) ) );
+}
+
+template<class T> bool isnan( T x )
+{
+    return _isnan( static_cast<double>( x ) ) != 0;
+}
+
+template<class T> bool isfinite( T x )
+{
+    return _finite( static_cast<double>( x ) ) != 0;
+}
+
+template<class T> bool isinf( T x )
+{
+    return ( _fpclass( static_cast<double>( x ) ) & ( _FPCLASS_PINF | _FPCLASS_NINF ) ) != 0;
+}
+
+inline bool isnormal( float x )
+{
+    // no _fpclassf in 32 bit mode
+    unsigned y = reinterpret_cast< unsigned const& >( x );
+    unsigned exp = ( y >> 23 ) & 0xFF;
+    return exp != 0 && exp != 0xFF;
+}
+
+inline bool isnormal( double x )
+{
+    return ( _fpclass( x ) & ( _FPCLASS_PN | _FPCLASS_NN ) ) != 0;
+}
+
+inline bool isnormal( long double x )
+{
+    return boost::core::isnormal( static_cast<double>( x ) );
+}
+
+template<class T> bool signbit( T x )
+{
+    return _copysign( 1.0, static_cast<double>( x ) ) < 0.0;
+}
+
+int const fp_zero = 0;
+int const fp_subnormal = 1;
+int const fp_normal = 2;
+int const fp_infinite = 3;
+int const fp_nan = 4;
+
+inline int fpclassify( float x )
+{
+    switch( _fpclass( x ) )
+    {
+    case _FPCLASS_SNAN:
+    case _FPCLASS_QNAN:
+
+        return fp_nan;
+
+    case _FPCLASS_NINF:
+    case _FPCLASS_PINF:
+
+        return fp_infinite;
+
+    case _FPCLASS_NZ:
+    case _FPCLASS_PZ:
+
+        return fp_zero;
+
+    default:
+
+        return boost::core::isnormal( x )? fp_normal: fp_subnormal;
+    }
+}
+
+inline int fpclassify( double x )
+{
+    switch( _fpclass( x ) )
+    {
+    case _FPCLASS_SNAN:
+    case _FPCLASS_QNAN:
+
+        return fp_nan;
+
+    case _FPCLASS_NINF:
+    case _FPCLASS_PINF:
+
+        return fp_infinite;
+
+    case _FPCLASS_NZ:
+    case _FPCLASS_PZ:
+
+        return fp_zero;
+
+    case _FPCLASS_ND:
+    case _FPCLASS_PD:
+
+        return fp_subnormal;
+
+    default:
+
+        return fp_normal;
+    }
+}
+
+inline int fpclassify( long double x )
+{
+    return boost::core::fpclassify( static_cast<double>( x ) );
+}
+
+#else
+
+using std::isfinite;
+using std::isnan;
+using std::isinf;
+using std::isnormal;
+using std::fpclassify;
+
+int const fp_zero = FP_ZERO;
+int const fp_subnormal = FP_SUBNORMAL;
+int const fp_normal = FP_NORMAL;
+int const fp_infinite = FP_INFINITE;
+int const fp_nan = FP_NAN;
+
+using std::signbit;
+
+// std::copysign doesn't exist in libstdc++ under -std=c++03
+
+#if !defined(__GNUC__)
+
+template<class T> T copysign( T x, T y )
+{
+    return std::copysign( x, y );
+}
+
+#else
+
+namespace detail
+{
+
+// ::copysignl is unreliable, use the built-ins
+
+inline float copysign_impl( float x, float y )
+{
+    return __builtin_copysignf( x, y );
+}
+
+inline double copysign_impl( double x, double y )
+{
+    return __builtin_copysign( x, y );
+}
+
+inline long double copysign_impl( long double x, long double y )
+{
+    return __builtin_copysignl( x, y );
+}
+
+} // namespace detail
+
+template<class T> T copysign( T x, T y )
+{
+    return boost::core::detail::copysign_impl( x, y );
+}
+
+#endif // !defined(__GNUC__)
+#endif // #if defined(_MSC_VER) && _MSC_VER < 1800
+
+} // namespace core
+} // namespace boost
+
+#endif // defined(BOOST_CORE_USE_GENERIC_CMATH)
+
+#endif  // #ifndef BOOST_CORE_CMATH_HPP_INCLUDED

include/boost/core/detail/splitmix64.hpp

@@ -0,0 +1,54 @@
+#ifndef BOOST_CORE_DETAIL_SPLITMIX64_HPP_INCLUDED
+#define BOOST_CORE_DETAIL_SPLITMIX64_HPP_INCLUDED
+
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+//
+// An implementation of splitmix64 for testing purposes,
+// derived from Sebastiano Vigna's public domain implementation
+// http://xorshift.di.unimi.it/splitmix64.c
+
+#include <boost/cstdint.hpp>
+
+namespace boost
+{
+namespace detail
+{
+
+class splitmix64
+{
+private:
+
+    boost::uint64_t x_;
+
+public:
+
+    splitmix64(): x_( 0 )
+    {
+    }
+
+    explicit splitmix64( boost::uint64_t seed ): x_( seed )
+    {
+    }
+
+    boost::uint64_t operator()()
+    {
+        x_ += 0x9e3779b97f4a7c15;
+
+        boost::uint64_t z = x_;
+
+        z ^= z >> 30;
+        z *= 0xbf58476d1ce4e5b9;
+        z ^= z >> 27;
+        z *= 0x94d049bb133111eb;
+        z ^= z >> 31;
+
+        return z;
+    }
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_CORE_DETAIL_SPLITMIX64_HPP_INCLUDED

include/boost/core/ignore_unused.hpp

@@ -11,34 +11,64 @@
 
 namespace boost {
 
-#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+template <typename... Ts>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(Ts&& ...)
+{}
+
+#else
 
 template <typename... Ts>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(Ts const& ...)
 {}
 
+#endif
+
 template <typename... Ts>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
-#else
+#else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template <typename T1>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1&)
+{}
 
 template <typename T1>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&)
 {}
 
+template <typename T1, typename T2>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1&, T2&)
+{}
+
 template <typename T1, typename T2>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&)
 {}
 
+template <typename T1, typename T2, typename T3>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1&, T2&, T3&)
+{}
+
 template <typename T1, typename T2, typename T3>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&)
 {}
 
+template <typename T1, typename T2, typename T3, typename T4>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1&, T2&, T3&, T4&)
+{}
+
 template <typename T1, typename T2, typename T3, typename T4>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&)
 {}
 
+template <typename T1, typename T2, typename T3, typename T4, typename T5>
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1&, T2&, T3&, T4&, T5&)
+{}
+
 template <typename T1, typename T2, typename T3, typename T4, typename T5>
 BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&, T5 const&)
 {}

include/boost/core/lightweight_test.hpp

@@ -27,9 +27,12 @@
 #include <exception>
 #include <iostream>
 #include <iterator>
+#include <string>
 #include <cstdlib>
 #include <cstring>
 #include <cstddef>
+#include <cctype>
+#include <cstdio>
 
 #if defined(_MSC_VER) && defined(_CPPLIB_VER) && defined(_DEBUG)
 # include <crtdbg.h>
@@ -173,6 +176,51 @@ template<class T> inline const void* test_output_impl(T volatile* v) { return co
 inline const void* test_output_impl(std::nullptr_t) { return nullptr; }
 #endif
 
+// print chars as numeric
+
+inline int test_output_impl( signed char const& v ) { return v; }
+inline unsigned test_output_impl( unsigned char const& v ) { return v; }
+
+// Whether wchar_t is signed is implementation-defined
+
+template<bool Signed> struct lwt_long_type {};
+template<> struct lwt_long_type<true> { typedef long type; };
+template<> struct lwt_long_type<false> { typedef unsigned long type; };
+
+inline lwt_long_type<(static_cast<wchar_t>(-1) < static_cast<wchar_t>(0))>::type test_output_impl( wchar_t const& v ) { return v; }
+
+#if !defined( BOOST_NO_CXX11_CHAR16_T )
+inline unsigned long test_output_impl( char16_t const& v ) { return v; }
+#endif
+
+#if !defined( BOOST_NO_CXX11_CHAR32_T )
+inline unsigned long test_output_impl( char32_t const& v ) { return v; }
+#endif
+
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable: 4996)
+#endif
+
+inline std::string test_output_impl( char const& v )
+{
+    if( std::isprint( static_cast<unsigned char>( v ) ) )
+    {
+        return std::string( 1, v );
+    }
+    else
+    {
+        char buffer[ 8 ];
+        std::sprintf( buffer, "\\x%02X", static_cast<unsigned char>( v ) );
+
+        return buffer;
+    }
+}
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
 // predicates
 
 struct lw_test_eq

include/boost/core/ref.hpp

@@ -10,6 +10,7 @@
 #include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 #include <boost/core/addressof.hpp>
+#include <boost/core/enable_if.hpp>
 
 //
 //  ref.hpp - ref/cref, useful helper functions
@@ -46,6 +47,26 @@ namespace boost
 
 #endif
 
+namespace detail
+{
+
+template< class Y, class T > struct ref_convertible
+{
+    typedef char (&yes) [1];
+    typedef char (&no)  [2];
+
+    static yes f( T* );
+    static no  f( ... );
+
+    enum _vt { value = sizeof( (f)( static_cast<Y*>(0) ) ) == sizeof(yes) };
+};
+
+struct ref_empty
+{
+};
+
+} // namespace detail
+
 // reference_wrapper
 
 /**
@@ -87,6 +108,21 @@ public:
 public:
 #endif
 
+    template<class Y> friend class reference_wrapper;
+
+    /**
+     Constructs a `reference_wrapper` object that stores the
+     reference stored in the compatible `reference_wrapper` `r`.
+
+     @remark Only enabled when `Y*` is convertible to `T*`.
+     @remark Does not throw.
+    */
+    template<class Y> reference_wrapper( reference_wrapper<Y> r,
+        typename enable_if_c<boost::detail::ref_convertible<Y, T>::value,
+            boost::detail::ref_empty>::type = boost::detail::ref_empty() ): t_( r.t_ )
+    {
+    }
+
     /**
      @return The stored reference.
      @remark Does not throw.

include/boost/core/type_name.hpp

@@ -0,0 +1,855 @@
+#ifndef BOOST_CORE_TYPE_NAME_HPP_INCLUDED
+#define BOOST_CORE_TYPE_NAME_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+// std::string boost::core::type_name<T>()
+//
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/demangle.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/config.hpp>
+#include <string>
+#include <functional>
+#include <memory>
+#include <utility>
+#include <cstdio>
+#include <cstddef>
+#include <iosfwd>
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+# include <string_view>
+#endif
+
+namespace boost
+{
+namespace core
+{
+
+namespace detail
+{
+
+// tn_identity
+
+template<class T> struct tn_identity
+{
+    typedef T type;
+};
+
+// tn_enable_if
+
+template<bool C, class T> struct tn_enable_if
+{
+};
+
+template<class T> struct tn_enable_if<true, T>
+{
+    typedef T type;
+};
+
+// tn_is_reference
+
+template<class T> struct tn_is_reference
+{
+    static const bool value = false;
+};
+
+template<class T> struct tn_is_reference<T&>
+{
+    static const bool value = true;
+};
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+template<class T> struct tn_is_reference<T&&>
+{
+    static const bool value = true;
+};
+
+#endif
+
+// tn_remove_const
+
+template<class T> struct tn_remove_const
+{
+    typedef T type;
+};
+
+template<class T> struct tn_remove_const<T const>
+{
+    typedef T type;
+};
+
+// tn_is_function (also catches references but that's OK)
+
+#if defined(BOOST_MSVC)
+# pragma warning(push)
+# pragma warning(disable: 4180 4181)
+#endif
+
+template<class T, class U = typename tn_remove_const<T>::type> struct tn_is_function: core::is_same<U, U const>
+{
+};
+
+#if defined(BOOST_MSVC)
+# pragma warning(pop)
+#endif
+
+#if !defined(BOOST_NO_TYPEID)
+
+// typeid_name
+
+template<class T> std::string typeid_name()
+{
+    std::string r = boost::core::demangle( typeid(T).name() );
+
+#if defined(_MSC_VER)
+
+    if( r.substr( 0, 6 ) == "class " )
+    {
+        r = r.substr( 6 );
+    }
+
+    if( r.substr( 0, 7 ) == "struct " )
+    {
+        r = r.substr( 7 );
+    }
+
+    if( r.substr( 0, 5 ) == "enum " )
+    {
+        r = r.substr( 5 );
+    }
+
+#endif
+
+    // libc++ inline namespace
+
+    if( r.substr( 0, 10 ) == "std::__1::" )
+    {
+        r = "std::" + r.substr( 10 );
+    }
+
+    // libstdc++ inline namespace
+
+    if( r.substr( 0, 14 ) == "std::__cxx11::" )
+    {
+        r = "std::" + r.substr( 14 );
+    }
+
+#if defined(BOOST_MSVC) && BOOST_MSVC == 1600
+
+    // msvc-10.0 puts TR1 things in std::tr1
+
+    if( r.substr( 0, 10 ) == "std::tr1::" )
+    {
+        r = "std::" + r.substr( 10 );
+    }
+
+#endif
+
+    return r;
+}
+
+// template names
+
+template<class T> std::string class_template_name()
+{
+    std::string r = typeid_name<T>();
+    return r.substr( 0, r.find( '<' ) );
+}
+
+template<class T> std::string sequence_template_name()
+{
+    return class_template_name<T>();
+}
+
+template<class T> std::string set_template_name()
+{
+    return class_template_name<T>();
+}
+
+template<class T> std::string map_template_name()
+{
+    return class_template_name<T>();
+}
+
+template<class T> std::string array_template_name()
+{
+    return class_template_name<T>();
+}
+
+#else // #if !defined(BOOST_NO_TYPEID)
+
+template<class T> std::string typeid_name()
+{
+    return "_Tp";
+}
+
+template<class T> std::string class_template_name()
+{
+    return "_Tm";
+}
+
+template<class T> std::string sequence_template_name()
+{
+    return "_Sq";
+}
+
+template<class T> std::string set_template_name()
+{
+    return "_St";
+}
+
+template<class T> std::string map_template_name()
+{
+    return "_Mp";
+}
+
+template<class T> std::string array_template_name()
+{
+    return "_Ar";
+}
+
+#endif
+
+// tn_to_string
+
+#if defined(BOOST_MSVC)
+# pragma warning( push )
+# pragma warning( disable: 4996 )
+#endif
+
+inline std::string tn_to_string( std::size_t n )
+{
+    char buffer[ 32 ];
+    std::sprintf( buffer, "%lu", static_cast< unsigned long >( n ) );
+
+    return buffer;
+}
+
+#if defined(BOOST_MSVC)
+# pragma warning( pop )
+#endif
+
+// tn_add_each
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template<class T> int tn_add_each_impl( std::string& st )
+{
+    if( !st.empty() ) st += ", ";
+    st += type_name( tn_identity<T>(), "" );
+    return 0;
+}
+
+template<class... T> std::string tn_add_each()
+{
+    std::string st;
+
+    typedef int A[ sizeof...(T) + 1 ];
+    (void)A{ 0, tn_add_each_impl<T>( st )... };
+
+    return st;
+}
+
+#endif
+
+// primary
+
+template<class T> std::string type_name( tn_identity<T>, std::string const& suffix )
+{
+    return typeid_name<T>() + suffix;
+}
+
+// integrals
+
+inline std::string type_name( tn_identity<unsigned>, std::string const& suffix )
+{
+    return "unsigned" + suffix;
+}
+
+#if defined(_MSC_VER)
+
+inline std::string type_name( tn_identity<long long>, std::string const& suffix )
+{
+    return "long long" + suffix;
+}
+
+inline std::string type_name( tn_identity<unsigned long long>, std::string const& suffix )
+{
+    return "unsigned long long" + suffix;
+}
+
+#endif
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+inline std::string type_name( tn_identity<char8_t>, std::string const& suffix )
+{
+    return "char8_t" + suffix;
+}
+
+#endif
+
+// cv
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
+
+template<class T> std::string type_name( tn_identity<T const>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " const" + suffix );
+}
+
+template<class T> std::string type_name( tn_identity<T volatile>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " volatile" + suffix );
+}
+
+template<class T> std::string type_name( tn_identity<T const volatile>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " const volatile" + suffix );
+}
+
+#else
+
+template<class T>
+typename tn_enable_if<!tn_is_function<T>::value, std::string>::type
+type_name( tn_identity<T const>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " const" + suffix );
+}
+
+template<class T>
+typename tn_enable_if<!tn_is_function<T>::value, std::string>::type
+type_name( tn_identity<T volatile>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " volatile" + suffix );
+}
+
+template<class T>
+typename tn_enable_if<!tn_is_function<T>::value, std::string>::type
+type_name( tn_identity<T const volatile>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), " const volatile" + suffix );
+}
+
+#endif
+
+// refs
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
+
+template<class T> std::string type_name( tn_identity<T&>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), "&" + suffix );
+}
+
+#else
+
+template<class T>
+typename tn_enable_if<!tn_is_reference<T>::value, std::string>::type
+type_name( tn_identity<T&>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), "&" + suffix );
+}
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+template<class T> std::string type_name( tn_identity<T&&>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), "&&" + suffix );
+}
+
+#endif
+
+// function types
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template<class R, class... A> std::string function_type_name( tn_identity<R(A...)>, std::string const& trailer, std::string const& suffix )
+{
+    std::string r = type_name( tn_identity<R>(), "" );
+
+    if( !suffix.empty() )
+    {
+        r += '(';
+
+        if( suffix[ 0 ] == ' ' )
+        {
+            r += suffix.substr( 1 );
+        }
+        else
+        {
+            r += suffix;
+        }
+
+        r += ')';
+    }
+
+    r += '(' + tn_add_each<A...>() + ')';
+    r += trailer;
+
+    return r;
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...)>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), "", suffix );
+}
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile", suffix );
+}
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_REF_QUALIFIERS)
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) &>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " &", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const &>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const &", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile &>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile &", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile &>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile &", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) &&>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " &&", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const &&>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const &&", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile &&>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile &&", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile &&>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile &&", suffix );
+}
+
+#endif
+
+#if defined( __cpp_noexcept_function_type ) || defined( _NOEXCEPT_TYPES_SUPPORTED )
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) & noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " & noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const & noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const & noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile & noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile & noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile & noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile & noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) && noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " && noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const && noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const && noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) volatile && noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile && noexcept", suffix );
+}
+
+template<class R, class... A> std::string type_name( tn_identity<R(A...) const volatile && noexcept>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile && noexcept", suffix );
+}
+
+#endif
+
+#endif // #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+// pointers
+
+template<class T> std::string type_name( tn_identity<T*>, std::string const& suffix )
+{
+    return type_name( tn_identity<T>(), "*" + suffix );
+}
+
+// arrays
+
+template<class T> std::pair<std::string, std::string> array_prefix_suffix( tn_identity<T> )
+{
+    return std::pair<std::string, std::string>( type_name( tn_identity<T>(), "" ), "" );
+}
+
+template<class T, std::size_t N> std::pair<std::string, std::string> array_prefix_suffix( tn_identity<T[N]> )
+{
+    std::pair<std::string, std::string> r = array_prefix_suffix( tn_identity<T>() );
+
+    r.second = '[' + tn_to_string( N ) + ']' + r.second;
+
+    return r;
+}
+
+template<class T> std::string array_type_name( tn_identity<T[]>, std::string const& suffix )
+{
+    std::pair<std::string, std::string> r = array_prefix_suffix( tn_identity<T>() );
+
+    if( suffix.empty() )
+    {
+        return r.first + "[]" + r.second;
+    }
+    else
+    {
+        return r.first + '(' + suffix + ")[]" + r.second;
+    }
+}
+
+template<class T> std::string type_name( tn_identity<T[]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T[]>(), suffix );
+}
+
+template<class T> std::string type_name( tn_identity<T const[]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T const[]>(), suffix );
+}
+
+template<class T> std::string type_name( tn_identity<T volatile[]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T volatile[]>(), suffix );
+}
+
+template<class T> std::string type_name( tn_identity<T const volatile[]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T const volatile[]>(), suffix );
+}
+
+template<class T, std::size_t N> std::string array_type_name( tn_identity<T[N]>, std::string const& suffix )
+{
+    std::pair<std::string, std::string> r = array_prefix_suffix( tn_identity<T[N]>() );
+
+    if( suffix.empty() )
+    {
+        return r.first + r.second;
+    }
+    else
+    {
+        return r.first + '(' + suffix + ")" + r.second;
+    }
+}
+
+template<class T, std::size_t N> std::string type_name( tn_identity<T[N]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T[N]>(), suffix );
+}
+
+template<class T, std::size_t N> std::string type_name( tn_identity<T const[N]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T const[N]>(), suffix );
+}
+
+template<class T, std::size_t N> std::string type_name( tn_identity<T volatile[N]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T volatile[N]>(), suffix );
+}
+
+template<class T, std::size_t N> std::string type_name( tn_identity<T const volatile[N]>, std::string const& suffix )
+{
+    return array_type_name( tn_identity<T const volatile[N]>(), suffix );
+}
+
+// pointers to members
+
+template<class R, class T> std::string type_name( tn_identity<R T::*>, std::string const& suffix )
+{
+    return type_name( tn_identity<R>(), ' ' + type_name( tn_identity<T>(), "" ) + "::*" + suffix );
+}
+
+#if defined(BOOST_MSVC) && BOOST_MSVC <= 1900 && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template<class R, class T, class... A> std::string type_name( tn_identity<R(T::*)(A...) const>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const", ' ' + type_name( tn_identity<T>(), "" ) + "::*" + suffix );
+}
+
+template<class R, class T, class... A> std::string type_name( tn_identity<R(T::*)(A...) volatile>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " volatile", ' ' + type_name( tn_identity<T>(), "" ) + "::*" + suffix );
+}
+
+template<class R, class T, class... A> std::string type_name( tn_identity<R(T::*)(A...) const volatile>, std::string const& suffix )
+{
+    return function_type_name( tn_identity<R(A...)>(), " const volatile", ' ' + type_name( tn_identity<T>(), "" ) + "::*" + suffix );
+}
+
+#endif
+
+// nullptr_t
+
+#if !defined(BOOST_NO_CXX11_NULLPTR)
+
+inline std::string type_name( tn_identity<std::nullptr_t>, std::string const& suffix )
+{
+    return "std::nullptr_t" + suffix;
+}
+
+#endif
+
+// strings
+
+template<template<class Ch, class Tr, class A> class L, class Ch> std::string type_name( tn_identity< L<Ch, std::char_traits<Ch>, std::allocator<Ch> > >, std::string const& suffix )
+{
+    std::string tn = sequence_template_name< L<Ch, std::char_traits<Ch>, std::allocator<Ch> > >();
+    return tn + '<' + type_name( tn_identity<Ch>(), "" ) + '>' + suffix;
+}
+
+inline std::string type_name( tn_identity<std::string>, std::string const& suffix )
+{
+    return "std::string" + suffix;
+}
+
+inline std::string type_name( tn_identity<std::wstring>, std::string const& suffix )
+{
+    return "std::wstring" + suffix;
+}
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+
+inline std::string type_name( tn_identity<std::u16string>, std::string const& suffix )
+{
+    return "std::u16string" + suffix;
+}
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T)
+
+inline std::string type_name( tn_identity<std::u32string>, std::string const& suffix )
+{
+    return "std::u32string" + suffix;
+}
+
+#endif
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+inline std::string type_name( tn_identity<std::basic_string<char8_t>>, std::string const& suffix )
+{
+    return "std::u8string" + suffix;
+}
+
+#endif
+
+// string views (et al)
+
+template<template<class Ch, class Tr> class L, class Ch> std::string type_name( tn_identity< L<Ch, std::char_traits<Ch> > >, std::string const& suffix )
+{
+    std::string tn = sequence_template_name< L<Ch, std::char_traits<Ch> > >();
+    return tn + '<' + type_name( tn_identity<Ch>(), "" ) + '>' + suffix;
+}
+
+// needed for libstdc++
+inline std::string type_name( tn_identity<std::ostream>, std::string const& suffix )
+{
+    return "std::ostream" + suffix;
+}
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+
+inline std::string type_name( tn_identity<std::string_view>, std::string const& suffix )
+{
+    return "std::string_view" + suffix;
+}
+
+inline std::string type_name( tn_identity<std::wstring_view>, std::string const& suffix )
+{
+    return "std::wstring_view" + suffix;
+}
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+
+inline std::string type_name( tn_identity<std::u16string_view>, std::string const& suffix )
+{
+    return "std::u16string_view" + suffix;
+}
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T)
+
+inline std::string type_name( tn_identity<std::u32string_view>, std::string const& suffix )
+{
+    return "std::u32string_view" + suffix;
+}
+
+#endif
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+inline std::string type_name( tn_identity<std::basic_string_view<char8_t>>, std::string const& suffix )
+{
+    return "std::u8string_view" + suffix;
+}
+
+#endif
+
+#endif
+
+// class templates
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template<template<class...> class L, class... T> std::string type_name( tn_identity< L<T...> >, std::string const& suffix )
+{
+    std::string tn = class_template_name< L<T...> >();
+    std::string st = tn_add_each<T...>();
+
+    return tn + '<' + st + '>' + suffix;
+}
+
+#else
+
+template<template<class T1> class L, class T1> std::string type_name( tn_identity< L<T1> >, std::string const& suffix )
+{
+    std::string tn = class_template_name< L<T1> >();
+    return tn + '<' + type_name( tn_identity<T1>(), "" ) + '>' + suffix;
+}
+
+template<template<class T1, class T2> class L, class T1, class T2> std::string type_name( tn_identity< L<T1, T2> >, std::string const& suffix )
+{
+    std::string tn = class_template_name< L<T1, T2> >();
+    return tn + '<' + type_name( tn_identity<T1>(), "" ) + ", " + type_name( tn_identity<T2>(), "" ) + '>' + suffix;
+}
+
+#endif
+
+// sequence containers
+
+template<template<class T, class A> class L, class T> std::string type_name( tn_identity< L<T, std::allocator<T> > >, std::string const& suffix )
+{
+    std::string tn = sequence_template_name< L<T, std::allocator<T> > >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + '>' + suffix;
+}
+
+// set
+
+template<template<class T, class Pr, class A> class L, class T> std::string type_name( tn_identity< L<T, std::less<T>, std::allocator<T> > >, std::string const& suffix )
+{
+    std::string tn = set_template_name< L<T, std::less<T>, std::allocator<T> > >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + '>' + suffix;
+}
+
+// map
+
+template<template<class T, class U, class Pr, class A> class L, class T, class U> std::string type_name( tn_identity< L<T, U, std::less<T>, std::allocator<std::pair<T const, U> > > >, std::string const& suffix )
+{
+    std::string tn = map_template_name< L<T, U, std::less<T>, std::allocator<std::pair<T const, U> > > >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + ", " + type_name( tn_identity<U>(), "" ) +  '>' + suffix;
+}
+
+#if !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
+
+// unordered_set
+
+template<template<class T, class H, class Eq, class A> class L, class T> std::string type_name( tn_identity< L<T, std::hash<T>, std::equal_to<T>, std::allocator<T> > >, std::string const& suffix )
+{
+    std::string tn = set_template_name< L<T, std::hash<T>, std::equal_to<T>, std::allocator<T> > >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + '>' + suffix;
+}
+
+// unordered_map
+
+template<template<class T, class U, class H, class Eq, class A> class L, class T, class U> std::string type_name( tn_identity< L<T, U, std::hash<T>, std::equal_to<T>, std::allocator<std::pair<T const, U> > > >, std::string const& suffix )
+{
+    std::string tn = map_template_name< L<T, U, std::hash<T>, std::equal_to<T>, std::allocator<std::pair<T const, U> > > >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + ", " + type_name( tn_identity<U>(), "" ) +  '>' + suffix;
+}
+
+#endif
+
+// array
+
+template<template<class T, std::size_t N> class L, class T, std::size_t N> std::string type_name( tn_identity< L<T, N> >, std::string const& suffix )
+{
+    std::string tn = array_template_name< L<T, N> >();
+    return tn + '<' + type_name( tn_identity<T>(), "" ) + ", " + tn_to_string( N ) + '>' + suffix;
+}
+
+} // namespace detail
+
+template<class T> std::string type_name()
+{
+    return core::detail::type_name( core::detail::tn_identity<T>(), "" );
+}
+
+} // namespace core
+} // namespace boost
+
+#endif  // #ifndef BOOST_CORE_TYPE_NAME_HPP_INCLUDED

include/boost/core/uncaught_exceptions.hpp

@@ -26,6 +26,7 @@
 #pragma once
 #endif
 
+#if (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411)
 #if defined(__APPLE__)
 #include <Availability.h>
 // Apple systems only support std::uncaught_exceptions starting with specific versions:
@@ -34,16 +35,15 @@
 // - tvOS >= 10.0
 // - watchOS >= 3.0
 // https://github.com/boostorg/core/issues/80
-#if (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411) && \
-    ( \
-        (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200) || \
-        (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000) \
-    )
+#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200) || \
+    (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000)
 #define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
 #endif
+#else
+#define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
+#endif // defined(__APPLE__)
 // Visual Studio 14.0 supports N4152 std::uncaught_exceptions() but doesn't define __cpp_lib_uncaught_exceptions
-#elif (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411) || \
-    (defined(_MSC_VER) && _MSC_VER >= 1900)
+#elif (defined(_MSC_VER) && _MSC_VER >= 1900)
 #define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
 #endif
 

meta/libraries.json

@@ -8,14 +8,15 @@
         "Andrey Semashev"
     ],
     "maintainers": [
-        "Peter Dimov <pdimov -at- pdimov.com>",
+        "Peter Dimov <pdimov -at- gmail.com>",
         "Glen Fernandes <glenjofe -at- gmail.com>",
         "Andrey Semashev <andrey.semashev -at- gmail.com>"
     ],
     "description": "A collection of simple core utilities with minimal dependencies.",
     "category": [
         "Miscellaneous"
-    ]
+    ],
+    "cxxstd": "03"
     },
     {
         "key": "utility/enable_if",
@@ -33,7 +34,8 @@
         "maintainers": [
             "Jaakko Jarvi <jarvi -at- cs.tamu.edu>",
             "Jeremiah Willcock <jewillco -at- osl.iu.edu>"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/swap",
@@ -49,7 +51,8 @@
         ],
         "maintainers": [
             "Joseph Gauterin <joseph.gauterin -at- googlemail.com>"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "bind/ref",
@@ -67,6 +70,7 @@
         ],
         "category": [
             "Function-objects"
-        ]
+        ],
+        "cxxstd": "03"
     }
 ]

test/Jamfile.v2

@@ -35,7 +35,10 @@ compile-fail ref_rv_fail4.cpp ;
 compile-fail ref_rv_fail5.cpp ;
 compile-fail ref_implicit_fail.cpp ;
 compile-fail ref_implicit_fail2.cpp ;
+compile-fail ref_implicit_fail3.cpp ;
+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 ;
@@ -93,7 +96,11 @@ run lightweight_test_test4.cpp
   : : : $(pedantic-errors) ;
 run lightweight_test_test5.cpp
   : : : $(pedantic-errors)
-    <toolset>gcc-4.4.7:<cxxflags>-Wno-sign-compare ;
+    <toolset>gcc-4.4.7:<cxxflags>-Wno-sign-compare
+    <toolset>gcc-4.4:<cxxflags>-Wno-sign-compare
+  ;
+run lightweight_test_test6.cpp
+  : : : $(pedantic-errors) ;
 
 run-fail lightweight_test_all_eq_test.cpp ;
 run-fail lightweight_test_all_with_fail.cpp ;
@@ -114,6 +121,7 @@ run-fail lightweight_test_fail11.cpp : ;
 run-fail lightweight_test_fail12.cpp ;
 run-fail lightweight_test_fail13.cpp ;
 run-fail lightweight_test_fail14.cpp ;
+run-fail lightweight_test_fail15.cpp ;
 run-fail lightweight_test_lt_fail.cpp ;
 run-fail lightweight_test_le_fail.cpp ;
 run-fail lightweight_test_gt_fail.cpp ;
@@ -209,6 +217,12 @@ run test_lib_typeid.cpp lib_typeid : : : <link>static : test_lib_typeid_static ;
 run test_lib_typeid.cpp lib_typeid : : : <link>shared <rtti>off : test_lib_typeid_shared_no_rtti ;
 run test_lib_typeid.cpp lib_typeid : : : <link>static <rtti>off : test_lib_typeid_static_no_rtti ;
 
+run test_lib_typeid2.cpp lib_typeid : : : <link>shared : test_lib_typeid2_shared ;
+run test_lib_typeid2.cpp lib_typeid : : : <link>static : test_lib_typeid2_static ;
+
+run test_lib_typeid2.cpp lib_typeid : : : <link>shared <rtti>off : test_lib_typeid2_shared_no_rtti ;
+run test_lib_typeid2.cpp lib_typeid : : : <link>static <rtti>off : test_lib_typeid2_static_no_rtti ;
+
 run uncaught_exceptions.cpp
   : : : <exception-handling>on ;
 run uncaught_exceptions_np.cpp
@@ -217,5 +231,21 @@ run uncaught_exceptions_np.cpp
 run no_exceptions_support_test.cpp ;
 run no_exceptions_support_test.cpp : : : <exception-handling>off : no_exceptions_support_test_nx ;
 
+run cmath_test.cpp ;
+run cmath_test.cpp : : : <define>BOOST_CORE_USE_GENERIC_CMATH <toolset>msvc-8.0:<build>no : cmath_test_generic ;
+
+run bit_cast_test.cpp ;
+run bit_rotate_test.cpp ;
+run bit_countr_test.cpp ;
+run bit_countl_test.cpp ;
+run bit_width_test.cpp ;
+run has_single_bit_test.cpp ;
+run bit_floor_test.cpp ;
+run bit_ceil_test.cpp ;
+run bit_popcount_test.cpp ;
+run bit_endian_test.cpp ;
+
+run type_name_test.cpp ;
+
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;

test/allocator_size_type_test.cpp

@@ -27,7 +27,8 @@ int main()
     BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int,
         boost::allocator_size_type<A1<char> >::type>));
 #if !defined(BOOST_NO_CXX11_ALLOCATOR)
-    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<std::size_t,
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<
+        std::make_unsigned<std::ptrdiff_t>::type,
         boost::allocator_size_type<A2<int> >::type>));
 #endif
     return boost::report_errors();

test/bit_cast_test.cpp

@@ -0,0 +1,29 @@
+// Test for boost/core/bit.hpp (bit_cast)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/cstdint.hpp>
+#include <cstring>
+
+int main()
+{
+    {
+        float x = 0.89f;
+        boost::uint32_t y = boost::core::bit_cast<boost::uint32_t>( x );
+
+        BOOST_TEST( std::memcmp( &x, &y, sizeof(x) ) == 0 );
+    }
+
+    {
+        double x = 0.89;
+        boost::uint64_t y = boost::core::bit_cast<boost::uint64_t>( x );
+
+        BOOST_TEST( std::memcmp( &x, &y, sizeof(x) ) == 0 );
+    }
+
+    return boost::report_errors();
+}

test/bit_ceil_test.cpp

@@ -0,0 +1,65 @@
+// Test for boost/core/bit.hpp (bit_ceil)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_bit_ceil( T x )
+{
+    if( !boost::core::has_single_bit( x ) )
+    {
+        x >>= 1;
+    }
+
+    T y = boost::core::bit_ceil( x );
+
+    if( x == 0 )
+    {
+        BOOST_TEST_EQ( y, 0 );
+    }
+    else
+    {
+        BOOST_TEST( boost::core::has_single_bit( y ) );
+        BOOST_TEST_GE( +y, +x );
+        BOOST_TEST_LT( y >> 1, +x );
+    }
+}
+
+int main()
+{
+    {
+        test_bit_ceil( static_cast<unsigned char>( 0 ) );
+        test_bit_ceil( static_cast<unsigned short>( 0 ) );
+        test_bit_ceil( static_cast<unsigned int>( 0 ) );
+        test_bit_ceil( static_cast<unsigned long>( 0 ) );
+        test_bit_ceil( static_cast<unsigned long long>( 0 ) );
+    }
+
+    {
+        test_bit_ceil( static_cast<boost::uint8_t>( 0x80 ) );
+        test_bit_ceil( static_cast<boost::uint16_t>( 0x8000 ) );
+        test_bit_ceil( static_cast<boost::uint32_t>( 0x80000000 ) );
+        test_bit_ceil( static_cast<boost::uint64_t>( 0x8000000000000000 ) );
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_bit_ceil( static_cast<unsigned char>( x ) );
+        test_bit_ceil( static_cast<unsigned short>( x ) );
+        test_bit_ceil( static_cast<unsigned int>( x ) );
+        test_bit_ceil( static_cast<unsigned long>( x ) );
+        test_bit_ceil( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_countl_test.cpp

@@ -0,0 +1,46 @@
+// Test for boost/core/bit.hpp (countl_zero, countl_one)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_countl( T x )
+{
+    x |= static_cast<T>( 1 ) << ( std::numeric_limits<T>::digits - 1 );
+
+    for( int i = 0; i <= std::numeric_limits<T>::digits; ++i, x >>= 1 )
+    {
+        BOOST_TEST_EQ( boost::core::countl_zero( x ), i );
+        BOOST_TEST_EQ( boost::core::countl_one( static_cast<T>( ~x ) ), i );
+    }
+}
+
+int main()
+{
+    test_countl( static_cast<unsigned char>( 0 ) );
+    test_countl( static_cast<unsigned short>( 0 ) );
+    test_countl( static_cast<unsigned int>( 0 ) );
+    test_countl( static_cast<unsigned long>( 0 ) );
+    test_countl( static_cast<unsigned long long>( 0 ) );
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_countl( static_cast<unsigned char>( x ) );
+        test_countl( static_cast<unsigned short>( x ) );
+        test_countl( static_cast<unsigned int>( x ) );
+        test_countl( static_cast<unsigned long>( x ) );
+        test_countl( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_countr_test.cpp

@@ -0,0 +1,46 @@
+// Test for boost/core/bit.hpp (countr_zero, countr_one)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_countr( T x )
+{
+    x |= 1;
+
+    for( int i = 0; i <= std::numeric_limits<T>::digits; ++i, x <<= 1 )
+    {
+        BOOST_TEST_EQ( boost::core::countr_zero( x ), i );
+        BOOST_TEST_EQ( boost::core::countr_one( static_cast<T>( ~x ) ), i );
+    }
+}
+
+int main()
+{
+    test_countr( static_cast<unsigned char>( 0 ) );
+    test_countr( static_cast<unsigned short>( 0 ) );
+    test_countr( static_cast<unsigned int>( 0 ) );
+    test_countr( static_cast<unsigned long>( 0 ) );
+    test_countr( static_cast<unsigned long long>( 0 ) );
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_countr( static_cast<unsigned char>( x ) );
+        test_countr( static_cast<unsigned short>( x ) );
+        test_countr( static_cast<unsigned int>( x ) );
+        test_countr( static_cast<unsigned long>( x ) );
+        test_countr( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_endian_test.cpp

@@ -0,0 +1,36 @@
+// Test for boost/core/bit.hpp (bit_ceil)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/cstdint.hpp>
+#include <cstring>
+
+int main()
+{
+    boost::uint64_t v = static_cast<boost::uint64_t>( 0x0102030405060708ull );
+
+    if( boost::core::endian::native == boost::core::endian::little )
+    {
+        unsigned char w[] = { 8, 7, 6, 5, 4, 3, 2, 1 };
+        BOOST_TEST( std::memcmp( &v, w, 8 ) == 0 );
+    }
+    else if( boost::core::endian::native == boost::core::endian::big )
+    {
+        unsigned char w[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+        BOOST_TEST( std::memcmp( &v, w, 8 ) == 0 );
+    }
+    else
+    {
+        unsigned char w1[] = { 8, 7, 6, 5, 4, 3, 2, 1 };
+        BOOST_TEST( std::memcmp( &v, w1, 8 ) != 0 );
+
+        unsigned char w2[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+        BOOST_TEST( std::memcmp( &v, w2, 8 ) != 0 );
+    }
+
+    return boost::report_errors();
+}

test/bit_floor_test.cpp

@@ -0,0 +1,53 @@
+// Test for boost/core/bit.hpp (bit_floor)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_bit_floor( T x )
+{
+    T y = boost::core::bit_floor( x );
+
+    if( x == 0 )
+    {
+        BOOST_TEST_EQ( y, 0 );
+    }
+    else
+    {
+        BOOST_TEST( boost::core::has_single_bit( y ) );
+        BOOST_TEST_LE( +y, +x );
+        BOOST_TEST_GT( +y, x >> 1 );
+    }
+}
+
+int main()
+{
+    {
+        test_bit_floor( static_cast<unsigned char>( 0 ) );
+        test_bit_floor( static_cast<unsigned short>( 0 ) );
+        test_bit_floor( static_cast<unsigned int>( 0 ) );
+        test_bit_floor( static_cast<unsigned long>( 0 ) );
+        test_bit_floor( static_cast<unsigned long long>( 0 ) );
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_bit_floor( static_cast<unsigned char>( x ) );
+        test_bit_floor( static_cast<unsigned short>( x ) );
+        test_bit_floor( static_cast<unsigned int>( x ) );
+        test_bit_floor( static_cast<unsigned long>( x ) );
+        test_bit_floor( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_popcount_test.cpp

@@ -0,0 +1,46 @@
+// Test for boost/core/bit.hpp (bit_ceil)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+#include <iostream>
+
+template<class T> void test_popcount( T x )
+{
+    int k = 0;
+    for( T y = x; y; y &= y - 1, ++k );
+
+    BOOST_TEST_EQ( boost::core::popcount( x ), k ) || ( std::cerr << "x: " << +x << std::endl );
+}
+
+int main()
+{
+    {
+        test_popcount( static_cast<unsigned char>( 0 ) );
+        test_popcount( static_cast<unsigned short>( 0 ) );
+        test_popcount( static_cast<unsigned int>( 0 ) );
+        test_popcount( static_cast<unsigned long>( 0 ) );
+        test_popcount( static_cast<unsigned long long>( 0 ) );
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_popcount( static_cast<unsigned char>( x ) );
+        test_popcount( static_cast<unsigned short>( x ) );
+        test_popcount( static_cast<unsigned int>( x ) );
+        test_popcount( static_cast<unsigned long>( x ) );
+        test_popcount( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_rotate_test.cpp

@@ -0,0 +1,175 @@
+// Test for boost/core/bit.hpp (rotl, rotr)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+int const M = 256;
+
+template<class T> void test_rotate( T x )
+{
+    for( int i = 0; i < M; ++i )
+    {
+        BOOST_TEST_EQ( +boost::core::rotl( x, i ), +boost::core::rotr( x, -i ) );
+        BOOST_TEST_EQ( +boost::core::rotl( x, -i ), +boost::core::rotr( x, i ) );
+
+        unsigned const width = std::numeric_limits<T>::digits;
+        unsigned r = i & ( width - 1 );
+
+        if( r == 0 )
+        {
+            BOOST_TEST_EQ( +boost::core::rotl( x, i ), +x );
+            BOOST_TEST_EQ( +boost::core::rotr( x, i ), +x );
+        }
+        else
+        {
+            BOOST_TEST_EQ( +boost::core::rotl( x, i ), +static_cast<T>( (x << r) | (x >> (width - r)) ) );
+            BOOST_TEST_EQ( +boost::core::rotr( x, i ), +static_cast<T>( (x >> r) | (x << (width - r)) ) );
+        }
+    }
+}
+
+int main()
+{
+    {
+        boost::uint8_t x = 0x11;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x22 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x88 );
+
+        x = 0x22;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x44 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x11 );
+
+        x = 0x44;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x88 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x22 );
+
+        x = 0x88;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x11 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x44 );
+    }
+
+    {
+        boost::uint16_t x = 0x1111;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x2222 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x8888 );
+
+        x = 0x2222;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x4444 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x1111 );
+
+        x = 0x4444;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x8888 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x2222 );
+
+        x = 0x8888;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x1111 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x4444 );
+    }
+
+    {
+        boost::uint32_t x = 0x11111111;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x22222222 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x88888888 );
+
+        x = 0x22222222;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x44444444 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x11111111 );
+
+        x = 0x44444444;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x88888888 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x22222222 );
+
+        x = 0x88888888;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x11111111 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x44444444 );
+    }
+
+    {
+        boost::uint64_t x = 0x1111111111111111;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x2222222222222222 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x8888888888888888 );
+
+        x = 0x2222222222222222;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x4444444444444444 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x1111111111111111 );
+
+        x = 0x4444444444444444;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x8888888888888888 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x2222222222222222 );
+
+        x = 0x8888888888888888;
+
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x1111111111111111 );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x4444444444444444 );
+    }
+
+    for( int i = -M; i <= M; ++i )
+    {
+        {
+            unsigned char x = 0;
+            BOOST_TEST_EQ( +boost::core::rotl( x, i ), +x );
+            BOOST_TEST_EQ( +boost::core::rotr( x, i ), +x );
+        }
+
+        {
+            unsigned short x = 0;
+            BOOST_TEST_EQ( boost::core::rotl( x, i ), x );
+            BOOST_TEST_EQ( boost::core::rotr( x, i ), x );
+        }
+
+        {
+            unsigned int x = 0;
+            BOOST_TEST_EQ( boost::core::rotl( x, i ), x );
+            BOOST_TEST_EQ( boost::core::rotr( x, i ), x );
+        }
+
+        {
+            unsigned long x = 0;
+            BOOST_TEST_EQ( boost::core::rotl( x, i ), x );
+            BOOST_TEST_EQ( boost::core::rotr( x, i ), x );
+        }
+
+        {
+            unsigned long long x = 0;
+            BOOST_TEST_EQ( boost::core::rotl( x, i ), x );
+            BOOST_TEST_EQ( boost::core::rotr( x, i ), x );
+        }
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_rotate( static_cast<unsigned char>( x ) );
+        test_rotate( static_cast<unsigned short>( x ) );
+        test_rotate( static_cast<unsigned int>( x ) );
+        test_rotate( static_cast<unsigned long>( x ) );
+        test_rotate( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_width_test.cpp

@@ -0,0 +1,94 @@
+// Test for boost/core/bit.hpp (bit_width)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_width( T x )
+{
+    BOOST_TEST_EQ( boost::core::bit_width( x ), std::numeric_limits<T>::digits - boost::core::countl_zero( x ) );
+}
+
+int main()
+{
+    {
+        boost::uint8_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 8; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint8_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint8_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint16_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 16; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint16_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint16_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint32_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 32; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint32_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint32_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint64_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 64; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint64_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint64_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_width( static_cast<unsigned char>( x ) );
+        test_width( static_cast<unsigned short>( x ) );
+        test_width( static_cast<unsigned int>( x ) );
+        test_width( static_cast<unsigned long>( x ) );
+        test_width( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/cmath_test.cpp

@@ -0,0 +1,296 @@
+// Test for boost/core/cmath.hpp
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/cmath.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <limits>
+#include <cfloat>
+
+template<class T> void test_positive_normal( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_normal );
+
+    BOOST_TEST( !boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(+2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(+2) );
+}
+
+template<class T> void test_negative_normal( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_normal );
+
+    BOOST_TEST( boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(-2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(-2) );
+}
+
+template<class T> void test_positive_zero( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_zero );
+
+    BOOST_TEST( !boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(+2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(+2) );
+}
+
+template<class T> void test_negative_zero( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_zero );
+
+#if defined(BOOST_CORE_USE_GENERIC_CMATH) && BOOST_WORKAROUND(BOOST_GCC, < 40700)
+
+    // g++ 4.4, 4.6 fail these tests with optimizations on
+
+#else
+
+    BOOST_TEST( boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(-2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(-2) );
+
+#endif
+}
+
+template<class T> void test_positive_infinity( T x )
+{
+    BOOST_TEST( !boost::core::isfinite( x ) );
+    BOOST_TEST( boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_infinite );
+
+    BOOST_TEST( !boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(+2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(+2) );
+}
+
+template<class T> void test_negative_infinity( T x )
+{
+    BOOST_TEST( !boost::core::isfinite( x ) );
+    BOOST_TEST( boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_infinite );
+
+    BOOST_TEST( boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(-2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(-2) );
+}
+
+template<class T> void test_positive_nan( T x )
+{
+    BOOST_TEST( !boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_nan );
+
+    BOOST_TEST( !boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(+2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(+2) );
+}
+
+template<class T> void test_negative_nan( T x )
+{
+    BOOST_TEST( !boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_nan );
+
+    BOOST_TEST( boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(-2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(-2) );
+}
+
+template<class T> void test_positive_subnormal( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_subnormal );
+
+    BOOST_TEST( !boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(+2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(+2) );
+}
+
+template<class T> void test_negative_subnormal( T x )
+{
+    BOOST_TEST( boost::core::isfinite( x ) );
+    BOOST_TEST( !boost::core::isinf( x ) );
+    BOOST_TEST( !boost::core::isnan( x ) );
+    BOOST_TEST( !boost::core::isnormal( x ) );
+
+    BOOST_TEST_EQ( boost::core::fpclassify( x ), boost::core::fp_subnormal );
+
+    BOOST_TEST( boost::core::signbit( x ) );
+
+    BOOST_TEST_EQ( boost::core::copysign( T(+2), x ), T(-2) );
+    BOOST_TEST_EQ( boost::core::copysign( T(-2), x ), T(-2) );
+}
+
+template<class T> void test_positive_normal_( T x )
+{
+    test_positive_normal( x );
+    test_positive_normal( boost::core::copysign( x, T(+1) ) );
+    test_negative_normal( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_negative_normal_( T x )
+{
+    test_negative_normal( x );
+    test_positive_normal( boost::core::copysign( x, T(+1) ) );
+    test_negative_normal( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_positive_zero_( T x )
+{
+    test_positive_zero( x );
+    test_positive_zero( boost::core::copysign( x, T(+1) ) );
+    test_negative_zero( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_negative_zero_( T x )
+{
+    test_negative_zero( x );
+    test_positive_zero( boost::core::copysign( x, T(+1) ) );
+    test_negative_zero( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_positive_infinity_( T x )
+{
+    test_positive_infinity( x );
+    test_positive_infinity( boost::core::copysign( x, T(+1) ) );
+    test_negative_infinity( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_negative_infinity_( T x )
+{
+    test_negative_infinity( x );
+    test_positive_infinity( boost::core::copysign( x, T(+1) ) );
+    test_negative_infinity( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_positive_nan_( T x )
+{
+    test_positive_nan( x );
+    test_positive_nan( boost::core::copysign( x, T(+1) ) );
+    test_negative_nan( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_negative_nan_( T x )
+{
+    test_negative_nan( x );
+    test_positive_nan( boost::core::copysign( x, T(+1) ) );
+    test_negative_nan( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_positive_subnormal_( T x )
+{
+    test_positive_subnormal( x );
+    test_positive_subnormal( boost::core::copysign( x, T(+1) ) );
+    test_negative_subnormal( boost::core::copysign( x, T(-1) ) );
+}
+
+template<class T> void test_negative_subnormal_( T x )
+{
+    test_negative_subnormal( x );
+    test_positive_subnormal( boost::core::copysign( x, T(+1) ) );
+    test_negative_subnormal( boost::core::copysign( x, T(-1) ) );
+}
+
+int main()
+{
+    // float
+
+    test_positive_normal_( +1.0f );
+    test_negative_normal_( -1.0f );
+    test_positive_normal_( FLT_MIN );
+    test_negative_normal_( -FLT_MIN );
+    test_positive_normal_( FLT_MAX );
+    test_negative_normal_( -FLT_MAX );
+    test_positive_zero_( +0.0f );
+    test_negative_zero_( -0.0f );
+    test_positive_infinity_( std::numeric_limits<float>::infinity() );
+    test_negative_infinity_( -std::numeric_limits<float>::infinity() );
+    test_positive_nan_( std::numeric_limits<float>::quiet_NaN() );
+    test_negative_nan_( boost::core::copysign( std::numeric_limits<float>::quiet_NaN(), -1.0f ) );
+    test_positive_subnormal_( FLT_MIN / 2 );
+    test_negative_subnormal_( -FLT_MIN / 2 );
+
+    // double
+
+    test_positive_normal_( +1.0 );
+    test_negative_normal_( -1.0 );
+    test_positive_normal_( DBL_MIN );
+    test_negative_normal_( -DBL_MIN );
+    test_positive_normal_( DBL_MAX );
+    test_negative_normal_( -DBL_MAX );
+    test_positive_zero_( +0.0 );
+    test_negative_zero_( -0.0 );
+    test_positive_infinity_( std::numeric_limits<double>::infinity() );
+    test_negative_infinity_( -std::numeric_limits<double>::infinity() );
+    test_positive_nan_( std::numeric_limits<double>::quiet_NaN() );
+    test_negative_nan_( boost::core::copysign( std::numeric_limits<double>::quiet_NaN(), -1.0 ) );
+    test_positive_subnormal_( DBL_MIN / 2 );
+    test_negative_subnormal_( -DBL_MIN / 2 );
+
+    // long double
+
+    test_positive_normal_( +1.0l );
+    test_negative_normal_( -1.0l );
+    test_positive_normal_( LDBL_MIN );
+    test_negative_normal_( -LDBL_MIN );
+    test_positive_normal_( LDBL_MAX );
+    test_negative_normal_( -LDBL_MAX );
+    test_positive_zero_( +0.0l );
+    test_negative_zero_( -0.0l );
+    test_positive_infinity_( std::numeric_limits<long double>::infinity() );
+    test_negative_infinity_( -std::numeric_limits<long double>::infinity() );
+    test_positive_nan_( std::numeric_limits<long double>::quiet_NaN() );
+    test_negative_nan_( boost::core::copysign( std::numeric_limits<long double>::quiet_NaN(), -1.0l ) );
+    test_positive_subnormal_( LDBL_MIN / 2 );
+    test_negative_subnormal_( -LDBL_MIN / 2 );
+
+    return boost::report_errors();
+}

test/has_single_bit_test.cpp

@@ -0,0 +1,110 @@
+// Test for boost/core/bit.hpp (has_single_bit)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_single_bit( T x )
+{
+    BOOST_TEST_EQ( boost::core::has_single_bit( x ), boost::core::popcount( x ) == 1 );
+}
+
+int main()
+{
+    {
+        boost::uint8_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), false );
+
+        x = 1;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+
+        x = 2;
+
+        for( int i = 1; i < 8; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint8_t>( x | ( x >> 1 ) ) ), false );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint8_t>( x | ( x >> 1 ) | ( x >> 2 ) ) ), false );
+        }
+    }
+
+    {
+        boost::uint16_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), false );
+
+        x = 1;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+
+        x = 2;
+
+        for( int i = 1; i < 16; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint16_t>( x | ( x >> 1 ) ) ), false );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint16_t>( x | ( x >> 1 ) | ( x >> 2 ) ) ), false );
+        }
+    }
+
+    {
+        boost::uint32_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), false );
+
+        x = 1;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+
+        x = 2;
+
+        for( int i = 1; i < 32; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint32_t>( x | ( x >> 1 ) ) ), false );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint32_t>( x | ( x >> 1 ) | ( x >> 2 ) ) ), false );
+        }
+    }
+
+    {
+        boost::uint64_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), false );
+
+        x = 1;
+
+        BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+
+        x = 2;
+
+        for( int i = 1; i < 64; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::has_single_bit( x ), true );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint64_t>( x | ( x >> 1 ) ) ), false );
+            BOOST_TEST_EQ( boost::core::has_single_bit( static_cast<boost::uint64_t>( x | ( x >> 1 ) | ( x >> 2 ) ) ), false );
+        }
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_single_bit( static_cast<unsigned char>( x ) );
+        test_single_bit( static_cast<unsigned short>( x ) );
+        test_single_bit( static_cast<unsigned int>( x ) );
+        test_single_bit( static_cast<unsigned long>( x ) );
+        test_single_bit( static_cast<unsigned long long>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/lib_typeid.cpp

@@ -15,3 +15,12 @@ EXPORT boost::core::typeinfo const & get_typeid_int()
 {
     return BOOST_CORE_TYPEID( int );
 }
+
+struct BOOST_SYMBOL_VISIBLE X
+{
+};
+
+EXPORT boost::core::typeinfo const & get_typeid_X()
+{
+    return BOOST_CORE_TYPEID( X );
+}

test/lightweight_test_fail15.cpp

@@ -0,0 +1,37 @@
+// Test BOOST_TEST_NE with character types
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+int main()
+{
+    BOOST_TEST_NE( 'A', 'A' );
+    BOOST_TEST_NE( (char)1, (char)1 );
+    BOOST_TEST_NE( (unsigned char)1, (unsigned char)1 );
+    BOOST_TEST_NE( (signed char)-1, (signed char)-1 );
+
+    BOOST_TEST_NE( L'A', L'A' );
+    BOOST_TEST_NE( (wchar_t)1, (wchar_t)1 );
+
+    int exp = 6;
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+
+    BOOST_TEST_NE( (char16_t)1, (char16_t)1 );
+    ++exp;
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T)
+
+    BOOST_TEST_NE( (char32_t)1, (char32_t)1 );
+    ++exp;
+
+#endif
+
+    return boost::report_errors() == exp;
+}

test/lightweight_test_test6.cpp

@@ -0,0 +1,33 @@
+// Test BOOST_TEST_EQ with character types
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+
+int main()
+{
+    BOOST_TEST_EQ( 'A', 'A' );
+    BOOST_TEST_EQ( (char)1, (char)1 );
+    BOOST_TEST_EQ( (unsigned char)1, (unsigned char)1 );
+    BOOST_TEST_EQ( (signed char)-1, (signed char)-1 );
+
+    BOOST_TEST_EQ( L'A', L'A' );
+    BOOST_TEST_EQ( (wchar_t)1, (wchar_t)1 );
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+
+    BOOST_TEST_EQ( (char16_t)1, (char16_t)1 );
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T)
+
+    BOOST_TEST_EQ( (char32_t)1, (char32_t)1 );
+
+#endif
+
+    return boost::report_errors();
+}

test/ref_conversion_test.cpp

@@ -0,0 +1,39 @@
+//  Implicit conversions between compatible reference wrappers
+//
+//  Copyright 2020 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
+
+#include <boost/ref.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X
+{
+};
+
+struct Y: public X
+{
+};
+
+void f1( boost::reference_wrapper<X> r, Y * p )
+{
+    BOOST_TEST_EQ( r.get_pointer(), p );
+}
+
+void f2( boost::reference_wrapper<int const> r, int * p )
+{
+    BOOST_TEST_EQ( r.get_pointer(), p );
+}
+
+int main()
+{
+    Y y;
+    f1( boost::ref(y), &y );
+
+    int i = 0;
+    f2( boost::ref(i), &i );
+
+    return boost::report_errors();
+}

test/ref_implicit_fail3.cpp

@@ -0,0 +1,29 @@
+//
+// Incompatible reference_wrappers must not implicitly convert to each other
+//
+// Copyright 2020 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
+//
+
+#include <boost/ref.hpp>
+
+struct X
+{
+};
+
+struct Y
+{
+};
+
+void f( boost::reference_wrapper<X> )
+{
+}
+
+int main()
+{
+    Y y;
+    f( boost::ref(y) ); // should fail
+}

test/ref_implicit_fail4.cpp

@@ -0,0 +1,21 @@
+//
+// Incompatible reference_wrappers must not implicitly convert to each other
+//
+// Copyright 2020 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
+//
+
+#include <boost/ref.hpp>
+
+void f( boost::reference_wrapper< int const > )
+{
+}
+
+int main()
+{
+    long y = 0;
+    f( boost::ref(y) ); // should fail
+}

test/test_lib_typeid2.cpp

@@ -0,0 +1,34 @@
+
+// Copyright 2018, 2021 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/core/typeinfo.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+boost::core::typeinfo const & get_typeid_X();
+
+struct BOOST_SYMBOL_VISIBLE X
+{
+};
+
+struct Y
+{
+};
+
+int main()
+{
+    boost::core::typeinfo const & tx = BOOST_CORE_TYPEID( X );
+    boost::core::typeinfo const & ty = BOOST_CORE_TYPEID( Y );
+
+    boost::core::typeinfo const & tx2 = get_typeid_X();
+
+    BOOST_TEST( tx2 == tx );
+    BOOST_TEST( tx2 != ty );
+
+    BOOST_TEST( !tx2.before( tx ) );
+    BOOST_TEST( !tx.before( tx2 ) );
+
+    BOOST_TEST( tx2.before( ty ) != ty.before( tx2 ) );
+
+    return boost::report_errors();
+}

test/type_name_test.cpp

@@ -0,0 +1,357 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/type_name.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <string>
+#include <vector>
+#include <list>
+#include <deque>
+#include <set>
+#include <map>
+#include <utility>
+#include <cstddef>
+#include <iosfwd>
+
+#if !defined(BOOST_NO_CXX11_HDR_UNORDERED_SET)
+# include <unordered_set>
+#endif
+
+#if !defined(BOOST_NO_CXX11_HDR_UNORDERED_MAP)
+# include <unordered_map>
+#endif
+
+#if !defined(BOOST_NO_CXX11_HDR_ARRAY)
+# include <array>
+#endif
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+# include <string_view>
+#endif
+
+//
+
+#define TEST(...) BOOST_TEST_EQ((boost::core::type_name<__VA_ARGS__>()), std::string(#__VA_ARGS__))
+
+struct A
+{
+};
+
+class B
+{
+};
+
+template<class T1, class T2> struct X
+{
+};
+
+enum E1
+{
+    e1
+};
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+enum class E2
+{
+    e2
+};
+
+#endif
+
+struct Ch
+{
+};
+
+int main()
+{
+    TEST(signed char);
+    TEST(unsigned char);
+    TEST(short);
+    TEST(unsigned short);
+    TEST(int);
+    TEST(unsigned);
+    TEST(long);
+    TEST(unsigned long);
+    TEST(long long);
+    TEST(unsigned long long);
+
+    TEST(char);
+    TEST(wchar_t);
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+    TEST(char16_t);
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR16_T)
+    TEST(char32_t);
+#endif
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+    TEST(char8_t);
+#endif
+#if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L
+    TEST(std::byte);
+#endif
+
+    TEST(bool);
+
+    TEST(float);
+    TEST(double);
+    TEST(long double);
+
+    TEST(void);
+    TEST(void const);
+    TEST(void volatile);
+    TEST(void const volatile);
+
+    TEST(A);
+    TEST(B);
+
+    TEST(E1);
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+    TEST(E2);
+
+#endif
+
+    TEST(A const);
+    TEST(A volatile);
+    TEST(A const volatile);
+
+    TEST(B&);
+    TEST(B const&);
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+    TEST(B&&);
+    TEST(B const&&);
+
+#endif
+
+    TEST(A*);
+    TEST(B const* volatile*);
+
+    TEST(void*);
+    TEST(void const* volatile*);
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+    TEST(void());
+    TEST(int(float, A, B*));
+
+    TEST(void(*)());
+    TEST(void(**)());
+    TEST(void(***)());
+
+    TEST(void(* const* const*)());
+    TEST(void(* const* const&)());
+
+    TEST(void(&)());
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+
+    TEST(void(&&)());
+
+#endif
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
+
+    TEST(void() const);
+    TEST(void() volatile);
+    TEST(void() const volatile);
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_REF_QUALIFIERS)
+
+    TEST(void() &);
+    TEST(void() const &);
+    TEST(void() volatile &);
+    TEST(void() const volatile &);
+
+    TEST(void() &&);
+    TEST(void() const &&);
+    TEST(void() volatile &&);
+    TEST(void() const volatile &&);
+
+#endif
+
+#if defined( __cpp_noexcept_function_type ) || defined( _NOEXCEPT_TYPES_SUPPORTED )
+
+    TEST(void() noexcept);
+    TEST(void() const noexcept);
+    TEST(void() volatile noexcept);
+    TEST(void() const volatile noexcept);
+
+    TEST(void() & noexcept);
+    TEST(void() const & noexcept);
+    TEST(void() volatile & noexcept);
+    TEST(void() const volatile & noexcept);
+
+    TEST(void() && noexcept);
+    TEST(void() const && noexcept);
+    TEST(void() volatile && noexcept);
+    TEST(void() const volatile && noexcept);
+
+#endif
+
+#endif // #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+    TEST(A[]);
+    TEST(A const[]);
+    TEST(A volatile[]);
+    TEST(A const volatile[]);
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1500
+    TEST(A(&)[]);
+#endif
+    TEST(A const(***)[]);
+
+    TEST(B[1]);
+    TEST(B const[1]);
+    TEST(B volatile[1]);
+    TEST(B const volatile[1]);
+
+    TEST(B(&)[1]);
+    TEST(B const(***)[1]);
+
+    TEST(A[][2][3]);
+    TEST(A const[][2][3]);
+
+#if !defined(BOOST_MSVC) || BOOST_MSVC >= 1500
+    TEST(A(&)[][2][3]);
+#endif
+    TEST(A const(***)[][2][3]);
+
+    TEST(B[1][2][3]);
+    TEST(B const volatile[1][2][3]);
+
+    TEST(B(&)[1][2][3]);
+    TEST(B const volatile(***)[1][2][3]);
+
+    TEST(int A::*);
+    TEST(int const B::*);
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+    TEST(void(A::*)());
+    TEST(void(A::*)() const);
+    TEST(void(A::*)() volatile);
+    TEST(void(A::*)() const volatile);
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_REF_QUALIFIERS)
+
+    TEST(void(A::*)() &);
+    TEST(void(A::*)() const &&);
+
+#endif
+
+#if defined( __cpp_noexcept_function_type ) || defined( _NOEXCEPT_TYPES_SUPPORTED )
+
+    TEST(void(A::*)() volatile & noexcept);
+    TEST(void(A::*)() const volatile && noexcept);
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_NULLPTR)
+
+    TEST(std::nullptr_t);
+
+#endif
+
+    TEST(std::pair<A, B>);
+    TEST(std::pair<A const*, B*> volatile&);
+
+    TEST(std::basic_string<Ch>);
+
+    TEST(std::string);
+    TEST(std::wstring);
+
+#if BOOST_CXX_VERSION >= 201100L
+
+    TEST(std::u16string);
+    TEST(std::u32string);
+
+#endif
+
+#if BOOST_CXX_VERSION >= 202000L
+
+    TEST(std::u8string);
+
+#endif
+
+    TEST(X<A, B>);
+    TEST(X<A const&, B&> volatile&);
+
+    TEST(std::vector<int>);
+    TEST(std::vector<A>);
+    TEST(std::vector<std::string>);
+
+    TEST(std::list<int>);
+    TEST(std::list<B>);
+    TEST(std::list<std::wstring>);
+
+    TEST(std::deque<int>);
+    TEST(std::deque<A>);
+    TEST(std::deque<std::string>);
+
+    TEST(std::set<int>);
+    TEST(std::set<B>);
+    TEST(std::set<std::string>);
+
+    TEST(std::map<int, A>);
+    TEST(std::map<std::string, B>);
+    TEST(std::map<std::wstring, std::vector<std::string> const*> const&);
+
+#if !defined(BOOST_NO_CXX11_HDR_UNORDERED_SET)
+
+    TEST(std::unordered_set<int>);
+    TEST(std::unordered_set<std::string>);
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_HDR_UNORDERED_MAP)
+
+    TEST(std::unordered_map<int, A>);
+    TEST(std::unordered_map<std::string, B>);
+    TEST(std::unordered_map<std::wstring, std::set<std::string>*>);
+
+#endif
+
+#if !defined(BOOST_NO_CXX11_HDR_ARRAY)
+
+    TEST(std::array<std::string, 7>);
+    TEST(std::array<std::wstring const*, 0> const&);
+
+#endif
+
+    TEST(std::ostream);
+    TEST(std::basic_ostream<wchar_t>);
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+
+    TEST(std::basic_string_view<Ch>);
+
+    TEST(std::string_view);
+    TEST(std::wstring_view);
+
+#if BOOST_CXX_VERSION >= 201100L
+
+    TEST(std::u16string_view);
+    TEST(std::u32string_view);
+
+#endif
+
+#if BOOST_CXX_VERSION >= 202000L
+
+    TEST(std::u8string_view);
+
+#endif
+
+#endif
+
+    return boost::report_errors();
+}