glob headers

Add test around the MSVC defect

.github/workflows/ci.yml

@@ -0,0 +1,684 @@
+# 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/**
+
+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
+          - toolset: gcc-12
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-22.04
+            install:
+              - g++-12
+          - name: UBSAN
+            toolset: gcc-12
+            cxxstd: "03,11,14,17,20"
+            ubsan: 1
+            os: ubuntu-22.04
+            install:
+              - g++-12
+
+          # 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
+          - toolset: clang
+            compiler: clang++-13
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-22.04
+            install:
+              - clang-13
+          - toolset: clang
+            compiler: clang++-14
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-22.04
+            install:
+              - clang-14
+          - toolset: clang
+            compiler: clang++-13
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-20.04
+            install:
+              - clang-13
+              - libc++-13-dev
+              - libc++abi-13-dev
+            sources:
+              - "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-13 main"
+            source_keys:
+              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+            cxxflags: -stdlib=libc++
+            linkflags: -stdlib=libc++
+          - 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
+
+    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=$NET_RETRY_COUNT install -y sudo software-properties-common tzdata wget curl apt-transport-https ca-certificates make build-essential g++ python python3 perl git cmake
+                fi
+            fi
+            git config --global pack.threads 0
+
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: |
+            declare -a SOURCE_KEYS SOURCES
+            if [ -n "${{join(matrix.source_keys, ' ')}}" ]
+            then
+                SOURCE_KEYS=("${{join(matrix.source_keys, '" "')}}")
+            fi
+            if [ -n "${{join(matrix.sources, ' ')}}" ]
+            then
+                SOURCES=("${{join(matrix.sources, '" "')}}")
+            fi
+            for key in "${SOURCE_KEYS[@]}"
+            do
+                for i in {1..$NET_RETRY_COUNT}
+                do
+                    echo "Adding key: $key"
+                    wget -O - "$key" | sudo apt-key add - && break || sleep 2
+                done
+            done
+            if [ ${#SOURCES[@]} -gt 0 ]
+            then
+                APT_ADD_REPO_COMMON_ARGS=("-y")
+                APT_ADD_REPO_SUPPORTED_ARGS="$(apt-add-repository --help | perl -ne 'if (/^\s*-n/) { print "n"; } elsif (/^\s*-P/) { print "P"; } elsif (/^\s*-S/) { print "S"; } elsif (/^\s*-U/) { print "U"; }')"
+                if [ -n "$APT_ADD_REPO_SUPPORTED_ARGS" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*n*}" ]
+                then
+                    APT_ADD_REPO_COMMON_ARGS+=("-n")
+                fi
+                APT_ADD_REPO_HAS_SOURCE_ARGS="$([ -n "$APT_ADD_REPO_SUPPORTED_ARGS" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*P*}" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*S*}" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*U*}" ] && echo 1 || echo 0)"
+                for source in "${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")
+                        echo "apt-add-repository ${APT_ADD_REPO_ARGS[@]}"
+                        sudo -E apt-add-repository "${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" >> $GITHUB_ENV
+            GIT_VERSION="$(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
+                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 init tools/boost_install
+            git submodule init libs/headers
+            git submodule init tools/build
+            git submodule init tools/cmake
+            git submodule init libs/assert
+            git submodule init libs/config
+            git submodule init libs/static_assert
+            git submodule init libs/throw_exception
+            git submodule init libs/type_traits
+            git submodule init libs/utility
+            git submodule init libs/io
+            git submodule update $GIT_ARGS
+            ./bootstrap.sh
+            ./b2 headers
+            if [ -n "${{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
+
+      - 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[@]}"
+
+  windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: msvc-14.0
+            cxxstd: "14"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: msvc-14.2
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: clang-win
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: gcc
+            cxxstd: "03,11,14,17,2a"
+            addrmd: 64
+            os: windows-2019
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Boost
+        shell: cmd
+        run: |
+            echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
+            for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
+            echo LIBRARY: %LIBRARY%
+            echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
+            echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
+            echo GITHUB_REF: %GITHUB_REF%
+            if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
+            set BOOST_BRANCH=develop
+            for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
+            echo BOOST_BRANCH: %BOOST_BRANCH%
+            cd ..
+            git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
+            cd boost-root
+            xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+            git submodule init tools/boost_install
+            git submodule init libs/headers
+            git submodule init tools/build
+            git submodule init tools/cmake
+            git submodule init libs/assert
+            git submodule init libs/config
+            git submodule init libs/static_assert
+            git submodule init libs/throw_exception
+            git submodule init libs/type_traits
+            git submodule init libs/utility
+            git submodule init libs/io
+            git submodule update --jobs %GIT_FETCH_JOBS%
+            cmd /c bootstrap
+            b2 -d0 headers
+
+      - name: Run tests
+        shell: cmd
+        run: |
+            cd ../boost-root
+            b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release embed-manifest-via=linker
+
+  posix-cmake-subdir:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-18.04
+          - os: ubuntu-20.04
+          - os: ubuntu-22.04
+          - os: macos-10.15
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: sudo apt install ${{matrix.install}}
+
+      - 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
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+
+      - name: Use library with add_subdirectory
+        run: |
+          cd ../boost-root/libs/$LIBRARY/test/cmake_subdir_test
+          mkdir __build__ && cd __build__
+          cmake ..
+          cmake --build .
+          ctest --output-on-failure --no-tests=error
+
+  posix-cmake-install:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-18.04
+          - os: ubuntu-20.04
+          - os: ubuntu-22.04
+          - os: macos-10.15
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: sudo apt install ${{matrix.install}}
+
+      - 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
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+
+      - name: Configure
+        run: |
+          cd ../boost-root
+          mkdir __build__ && cd __build__
+          cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DCMAKE_INSTALL_PREFIX=~/.local ..
+
+      - name: Install
+        run: |
+          cd ../boost-root/__build__
+          cmake --build . --target install
+
+      - name: Use the installed library
+        run: |
+          cd ../boost-root/libs/$LIBRARY/test/cmake_install_test && mkdir __build__ && cd __build__
+          cmake -DCMAKE_INSTALL_PREFIX=~/.local ..
+          cmake --build .
+          ctest --output-on-failure --no-tests=error
+
+  posix-cmake-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-18.04
+          - os: ubuntu-20.04
+          - os: ubuntu-22.04
+          - os: macos-10.15
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: sudo apt install ${{matrix.install}}
+
+      - 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
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+
+      - name: Configure
+        run: |
+          cd ../boost-root
+          mkdir __build__ && cd __build__
+          cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DBUILD_TESTING=ON ..
+
+      - name: Build tests
+        run: |
+          cd ../boost-root/__build__
+          cmake --build . --target tests
+
+      - name: Run tests
+        run: |
+          cd ../boost-root/__build__
+          ctest --output-on-failure --no-tests=error

.travis.yml

@@ -1,310 +0,0 @@
-# Copyright 2016-2018 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)
-
-language: cpp
-
-sudo: false
-
-python: "2.7"
-
-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
-      dist: trusty
-      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++-8
-      env: UBSAN=1 TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
-      addons:
-        apt:
-          packages:
-            - g++-8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
-
-    - os: linux
-      compiler: clang++-3.5
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.5
-            - libstdc++-4.9-dev
-          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
-            - libstdc++-4.9-dev
-          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
-            - libstdc++-4.9-dev
-          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
-            - libstdc++-4.9-dev
-          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
-            - llvm-toolchain-trusty-4.0
-
-    - 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
-            - llvm-toolchain-trusty-5.0
-
-    - 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
-            - llvm-toolchain-trusty-6.0
-
-    - 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-trusty-7
-
-    - os: linux
-      compiler: clang++-6.0
-      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
-      addons:
-        apt:
-          packages:
-            - clang-6.0
-            - libstdc++-5-dev
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-6.0
-
-    - os: linux
-      compiler: clang++-libc++
-      env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - libc++-dev
-            - libc++abi-dev
-
-    - os: linux
-      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
-      compiler: g++
-      env: CMAKE_SUBDIR_TEST=1
-      script:
-      - cd libs/core/test/cmake_subdir_test && mkdir __build__ && cd __build__
-      - cmake ..
-      - 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/type_traits
-  - git submodule init tools/build
-  - git submodule init tools/boost_install
-  - 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

@@ -1,13 +1,13 @@
-# Copyright 2018 Peter Dimov
+# Generated by `boostdep --cmake core`
+# Copyright 2020, 2021 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
+# https://www.boost.org/LICENSE_1_0.txt
 
-# Partial (add_subdirectory only) and experimental CMake support
-# Subject to change; please do not rely on the contents of this file yet
+if(NOT DEFINED IDF_TARGET)
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5...3.20)
 
-project(BoostCore LANGUAGES CXX)
+project(boost_core VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
 add_library(boost_core INTERFACE)
 add_library(Boost::core ALIAS boost_core)
@@ -15,7 +15,34 @@ add_library(Boost::core ALIAS boost_core)
 target_include_directories(boost_core INTERFACE include)
 
 target_link_libraries(boost_core
-    INTERFACE
-        Boost::assert
-        Boost::config
+  INTERFACE
+    Boost::assert
+    Boost::config
+    Boost::static_assert
+    Boost::throw_exception
 )
+
+if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
+
+  add_subdirectory(test)
+
+endif()
+
+else()
+
+FILE(GLOB_RECURSE headers include/*.h include/*.hpp)
+
+idf_component_register(
+    SRCS
+        ${headers}
+    INCLUDE_DIRS
+        include
+    REQUIRES
+        boost_assert
+        boost_config
+        boost_static_assert
+        boost_throw_exception
+)
+
+endif()
+

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

@@ -1,4 +1,4 @@
-# Copyright 2016, 2017 Peter Dimov
+# Copyright 2016-2021 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)
 
@@ -14,37 +14,47 @@ branches:
 
 environment:
   matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0,msvc-12.0
+    - 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-14.0
+      TOOLSET: msvc-12.0,msvc-14.0
+      ADDRMD: 32,64
 
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: msvc-14.1
+      ADDRMD: 32,64
       CXXSTD: 14,17
 
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    # clang-win 32 bit fails to link with "unable to load mspdbcore.dll (error code: 126)"
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: clang-win
+      ADDRMD: 64
+      CXXSTD: 14,17,latest
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
 
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin64\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
 
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
 
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
 
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
@@ -60,11 +70,14 @@ install:
   - 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 libs/utility
+  - git submodule init libs/io
   - git submodule init tools/build
   - git submodule init tools/boost_install
   - git submodule update --jobs 4
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\core
+  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\core\
   - cmd /c bootstrap
   - b2 headers
 
@@ -73,4 +86,5 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j %NUMBER_OF_PROCESSORS% libs/core/test toolset=%TOOLSET% %CXXSTD%
+  - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
+  - b2 -j %NUMBER_OF_PROCESSORS% libs/core/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release embed-manifest-via=linker

doc/Jamfile.v2

@@ -5,12 +5,15 @@
 # Version 1.0. (See accompanying file LICENSE_1_0.txt
 # or copy at http://boost.org/LICENSE_1_0.txt)
 
+import project ;
 import doxygen ;
 import quickbook ;
 
+path-constant INCLUDES : ../../.. ;
+
 doxygen ref_reference
   :
-    [ glob ../../../boost/core/ref.hpp ]
+    $(INCLUDES)/boost/core/ref.hpp
   :
     <doxygen:param>ENABLE_PREPROCESSING=YES
     <doxygen:param>EXPAND_ONLY_PREDEF=YES
@@ -49,7 +52,7 @@ boostbook standalone
     <xsl:param>boost.root=../../../..
     <xsl:param>generate.section.toc.level=1
     <xsl:param>toc.max.depth=1
-    <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/libs/core/doc/html
+    <format>pdf:<xsl:param>boost.url.prefix="http://www.boost.org/doc/libs/release/libs/core/doc/html"
   ;
 
 ###############################################################################

doc/allocator_access.qbk

@@ -0,0 +1,302 @@
+[/
+Copyright 2020-2022 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section allocator_access]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+The header `<boost/core/allocator_access.hpp>` provides the class and function
+templates to simplify allocator use. It provides the same functionality as the
+C++ standard library `std::allocator_traits` but with individual templates for
+each allocator feature.
+
+It also adds additional functionality for allocator aware exception safe
+construction and destruction of arrays.
+
+These facilities also simplify existing libraries by avoiding having to check
+for `BOOST_NO_CXX11_ALLOCATOR` and conditionally use `std::allocator_traits`.
+
+[endsect]
+
+[section Examples]
+
+The following example shows these utilities used in the definition of
+an allocator-aware container class:
+
+```
+template<class T, class A = boost::default_allocator<T> >
+class container
+    : boost::empty_value<typename boost::allocator_rebind<A, T>::type> {
+public:
+    typedef T value_type;
+    typedef A allocator_type;
+    typedef typename boost::allocator_size_type<A>::type size_type;
+    typedef typename boost::allocator_difference_type<A>::type difference_type;
+    typedef value_type& reference;
+    typedef const value_type& const_reference;
+    typedef typename boost::allocator_pointer<A>::type pointer;
+    typedef typename boost::allocator_const_pointer<A>::type const_pointer;
+    // ...
+};
+```
+
+In C++11 or above, aliases such as `boost::allocator_pointer_t<A>` can be used
+instead of `typename boost::allocator_pointer<A>::type`.
+
+The following example allocates storage for an array of `n` elements of `T`
+using an allocator `a` and constructs `T` elements in that storage. If any
+exception was thrown during construction of an element, the constructed
+elements are destroyed in reverse order.
+
+```
+template<class A>
+auto create(A& a, std::size_t n)
+{
+    auto p = a.allocate(n);
+    try {
+        boost::allocator_construct_n(a, boost::to_address(p), n);
+    } catch (...) {
+        a.deallocate(p, n);
+        throw;
+    }
+    return p;
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class A>
+struct allocator_value_type;
+
+template<class A>
+using allocator_value_type_t = typename allocator_value_type<A>::type;
+
+template<class A>
+struct allocator_pointer;
+
+template<class A>
+using allocator_pointer_t = typename allocator_pointer<A>::type;
+
+template<class A>
+struct allocator_const_pointer;
+
+template<class A>
+using allocator_const_pointer_t = typename allocator_const_pointer<A>::type;
+
+template<class A>
+struct allocator_void_pointer;
+
+template<class A>
+using allocator_void_pointer_t = typename allocator_void_pointer<A>::type;
+
+template<class A>
+struct allocator_const_void_pointer;
+
+template<class A>
+using allocator_const_void_pointer_t =
+    typename allocator_const_void_pointer<A>::type;
+
+template<class A>
+struct allocator_difference_type;
+
+template<class A>
+using allocator_difference_type_t =
+    typename allocator_difference_type<A>::type;
+
+template<class A>
+struct allocator_size_type;
+
+template<class A>
+using allocator_size_type_t = typename allocator_size_type<A>::type;
+
+template<class A>
+struct allocator_propagate_on_container_copy_assignment;
+
+template<class A>
+using allocator_propagate_on_container_copy_assignment_t =
+    typename allocator_propagate_on_container_copy_assignment<A>::type;
+
+template<class A>
+struct allocator_propagate_on_container_move_assignment;
+
+template<class A>
+using allocator_propagate_on_container_move_assignment_t =
+    typename allocator_propagate_on_container_move_assignment<A>::type;
+
+template<class A>
+struct allocator_propagate_on_container_swap;
+
+template<class A>
+using allocator_propagate_on_container_swap_t =
+    typename allocator_propagate_on_container_swap<A>::type;
+
+template<class A>
+struct allocator_is_always_equal;
+
+template<class A>
+using allocator_is_always_equal_t =
+    typename allocator_is_always_equal<A>::type;
+
+template<class A, class T>
+struct allocator_rebind;
+
+template<class A, class T>
+using allocator_rebind_t = typename allocator_rebind<A, T>::type;
+
+template<class A>
+allocator_pointer_t<A> allocator_allocate(A& a, allocator_size_type_t<A> n);
+
+template<class A>
+allocator_pointer_t<A> allocator_allocate(A& a, allocator_size_type_t<A> n,
+    allocator_const_void_pointer_t<A> h);
+
+template<class A>
+void allocator_deallocate(A& a, allocator_pointer_t<A> p,
+    allocator_size_type_t<A> n);
+
+template<class A, class T, class... Args>
+void allocator_construct(A& a, T* p, Args&&... args);
+
+template<class A, class T>
+void allocator_construct_n(A& a, T* p, std::size_t n);
+
+template<class A, class T>
+void allocator_construct_n(A& a, T* p, std::size_t n, const T* l,
+    std::size_t m);
+
+template<class A, class T, class I>
+void allocator_construct_n(A& a, T* p, std::size_t n, I begin);
+
+template<class A, class T>
+void allocator_destroy(A& a, T* p);
+
+template<class A, class T>
+void allocator_destroy_n(A& a, T* p, std::size_t n);
+
+template<class A>
+allocator_size_type_t<A> allocator_max_size(const A& a);
+
+template<class A>
+A allocator_select_on_container_copy_construction(const A& a);
+
+} // boost
+```
+
+[section Types]
+
+[variablelist
+[[`template<class A> struct allocator_value_type;`]
+[The member `type` is `A::value_type`.]]
+[[`template<class A> struct allocator_pointer;`]
+[The member `type` is `A::pointer` if valid, otherwise
+`allocator_value_type_t<A>*`.]]
+[[`template<class A> struct allocator_const_pointer;`]
+[The member `type` is `A::const_pointer` if valid, otherwise
+`pointer_traits<allocator_pointer_t<A> >::rebind<const
+allocator_value_type_t<A> >`.]]
+[[`template<class A> struct allocator_void_pointer;`]
+[The member `type` is `A::void_pointer` if valid, otherwise
+`pointer_traits<allocator_pointer_t<A> >::rebind<void>`.]]
+[[`template<class A> struct allocator_const_void_pointer;`]
+[The member `type` is `A::const_void_pointer` if valid, otherwise
+`pointer_traits<allocator_pointer_t<A> >::rebind<const void>`.]]
+[[`template<class A> struct allocator_difference_type;`]
+[The member `type` is `A::difference_type` if valid, otherwise
+`pointer_traits<allocator_pointer_t<A> >::difference_type`.]]
+[[`template<class A> struct allocator_size_type;`]
+[The member `type` is `A::size_type` if valid, otherwise
+`std::make_unsigned_t<allocator_difference_type_t<A> >`.]]
+[[`template<class A> struct allocator_propagate_on_container_copy_assignment;`]
+[The member `type` is `A::propagate_on_container_copy_assignment` if valid,
+otherwise `std::false_type`.]]
+[[`template<class A> struct allocator_propagate_on_container_move_assignment;`]
+[The member `type` is `A::propagate_on_container_move_assignment` if valid,
+otherwise `std::false_type`.]]
+[[`template<class A> struct allocator_propagate_on_container_swap;`]
+[The member `type` is `A::propagate_on_container_swap` if valid, otherwise
+`std::false_type`.]]
+[[`template<class A> struct allocator_is_always_equal;`]
+[The member `type` is `A::is_always_equal` if valid, otherwise
+`std::is_empty<A>::type`.]]
+[[`template<class A, class T> struct allocator_rebind;`]
+[The member `type` is `A::rebind<T>::other` if valid, otherwise `A<T, Args>`
+if this `A` is `A<U, Args>`.]]]
+
+[endsect]
+
+[section Functions]
+
+[variablelist
+[[`template<class A>
+allocator_pointer_t<A> allocator_allocate(A& a, allocator_size_type_t<A> n);`]
+[Calls `a.allocate(n)`.]]
+[[`template<class A> allocator_pointer_t<A> allocator_allocate(A& a,
+allocator_size_type_t<A> n, allocator_const_void_pointer_t<A> hint);`]
+[Calls `a.allocate(n, hint)` if valid, otherwise calls `a.allocate(n)`.]]
+[[`template<class A> void allocator_deallocate(A& a, allocator_pointer_t<A> p,
+allocator_size_type_t<A> n);`]
+[Calls `a.deallocate(p, n)`.]]
+[[`template<class A, class T, class... Args>
+void allocator_construct(A& a, T*p, Args&&... args);`]
+[Calls `a.construct(p, std::forward<Args>(args)...)` if valid, otherwise calls
+`::new(static_cast<void*>(p)) T(std::forward<Args>(args)...)`.]]
+[[`template<class A, class T>
+void alloc_construct_n(A& a, T* p, std::size_t n);`]
+[Constructs each `i`-th element in order by calling
+`boost::allocator_construct(a, &p[i])`.
+If an exception is thrown destroys each already constructed `j`-th element in
+reverse order by calling `boost::allocator_destroy(a, &p[j])`.]]
+[[`template<class A, class T>
+void alloc_construct_n(A& a, T* p, std::size_t n, const T* l, std::size_t m);`]
+[Constructs each `i`-th element in order by calling
+`boost::allocator_construct(a, &p[i], l[i % m])`.
+If an exception is thrown destroys each already constructed `j`-th element in
+reverse order by calling `boost::allocator_destroy(a, &p[j])`.]]
+[[`template<class A, class T, class I>
+void alloc_construct_n(A& a, T* p, std::size_t n, I begin);`]
+[Constructs each `i`-th element in order by calling
+`boost::allocator_construct(a, &p[i], *begin++)`.
+If an exception is thrown destroys each already constructed `j`-th element in
+reverse order by calling `boost::allocator_destroy(a, &p[j])`.]]
+[[`template<class A, class T> void allocator_destroy(A& a, T* p);`]
+[Calls `a.destroy(p)` if valid, otherwise calls `p->~T()`.]]
+[[`template<class A, class T>
+void allocator_destroy_n(A& a, T* p, std::size_t n);`]
+[Destroys each `i`-th element in reverse order by calling
+`boost::allocator_destroy(a, &p[i])`.]]
+[[`template<class A> allocator_size_type_t<A> allocator_max_size(const A& a);`]
+[Returns `a.max_size()` if valid, otherwise returns
+`std::numeric_limits<allocator_size_type_t<A> >::max() /
+sizeof(allocator_value_type_t<A>)`.]]
+[[`template<class A> A allocator_select_on_container_copy_construction(const
+A& a);`]
+[Returns `a.select_on_container_copy_construction()` if valid, otherwise
+returns `a`.]]]
+
+[endsect]
+
+[endsect]
+
+[section Acknowledgments]
+
+Glen Fernandes implemented the allocator access utilities.
+
+[endsect]
+
+[endsect]

doc/allocator_traits.qbk

@@ -0,0 +1,116 @@
+[/
+Copyright 2021 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:allocator_traits allocator_traits]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+This header <boost/core/allocator_traits.hpp> provides an implementation of the
+C++ standard library class template `allocator_traits` based on the facilities
+in [link core.allocator_access Allocator Access]. Users should still prefer the
+individual traits, but this utility exists to simplify migration.
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class A>
+struct allocator_traits {
+    using allocator_type = A;
+
+    using value_type = allocator_value_type_t<A>;
+
+    using pointer = allocator_pointer_t<A>;
+
+    using const_pointer = allocator_const_pointer_t<A>;
+
+    using void_pointer = allocator_void_pointer_t<A>;
+
+    using const_pointer = allocator_const_void_pointer_t<A>;
+
+    using difference_type = allocator_difference_type_t<A>;
+
+    using size_type = allocator_size_type_t<A>;
+
+    using propagate_on_container_copy_assignment =
+        allocator_propagate_on_container_copy_assignment_t<A>;
+
+    using propagate_on_container_move_assignment =
+        allocator_propagate_on_container_move_assignment_t<A>;
+
+    using propagate_on_container_swap =
+        allocator_propagate_on_container_swap_t<A>;
+
+    using is_always_equal = allocator_is_always_equal_t<A>;
+
+    template<class T>
+    using rebind_traits = allocator_traits<allocator_rebind_t<A, T> >;
+
+    static pointer allocate(A& a, size_type n);
+
+    static pointer allocate(A& a, size_type n, const_void_pointer h);
+
+    static void deallocate(A& a, pointer p, size_type n);
+
+    template<class T, class... Args>
+    static void construct(A& a, T* p, Args&&... args);
+
+    static void destroy(A& a, T* p);
+
+    static size_type max_size(const A& a) noexcept;
+
+    static A select_on_container_copy_construction(const A& a);
+};
+
+} /* boost */
+```
+
+[section Static member functions]
+
+[variablelist
+[[`static pointer allocate(A& a, size_type n);`]
+[Equivalent to: `return boost::allocator_allocate(a, n);`]]
+[[`static pointer allocate(A& a, size_type n, const_void_pointer h);`]
+[Equivalent to: `return boost::allocator_allocate(a, n, h);`]]
+[[`static void deallocate(A& a, pointer p, size_type n);`]
+[Equivalent to: `boost::allocator_deallocate(a, n, h);`]]
+[[`template<class T, class... Args>
+static void construct(A& a, T* p, Args&&... args);`]
+[Equivalent to:
+`boost::allocator_construct(a, p, std::forward<Args>(args)...);`]]
+[[`static void destroy(A& a, T* p);`]
+[Equivalent to: `boost::allocator_destroy(a, p);`]]
+[[`static size_type max_size(const A& a) noexcept;`]
+[Equivalent to: `return boost::allocator_max_size(a);`]]
+[[`static A select_on_container_copy_construction(const A& a);`]
+[Equivalent to:
+`return boost::allocator_select_on_container_copy_construction(a);`]]]
+
+[endsect]
+
+[endsect]
+
+[section Notes]
+
+# The member `rebind_alloc` is not provided for parity with C++03 where it is
+unimplementable. Instead of `allocator_traits<A>::rebind_alloc<U>` you can
+express the same with `allocator_traits<A>::rebind_traits<U>::allocator_type`
+or more simply with `allocator_rebind_t<A, U>`.
+
+[endsect]
+
+[endsect]

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 +1,101 @@
+[/
+  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 1.79.0]
+
+* Added `boost::allocator_traits`, an implementation of `std::allocator_traits`.
+* Made `boost::pointer_traits` SFINAE friendly.
+* `boost/iterator.hpp` is deprecated and will be removed in a future release. The header defines `boost::iterator` template, which is equivalent to `std::iterator` in `<iterator>` header. However, since `std::iterator` is itself deprecated in C++17, users are advised to remove `boost::iterator` or `std::iterator` use from their code.
+* Added `boost::core::verbose_terminate_handler`, a utility function intended
+  to be passed to `std::set_terminate` that prints information about the
+  uncaught exception to `stderr`.
+
+[endsect]
+
+[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`, a utility function that returns the name of a type as a string.
+* Added `boost::span`, a C++11 implementation of C++20's `std::span`.
+
+[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]
+
+* Added implicit conversion between compatible reference wrappers.
+* Added `boost/core/cmath.hpp`, a portable implementation of the floating point classification functions from `<cmath>`.
+* Added `boost/core/bit.hpp`, a portable implementation of the C++20 standard header `<bit>`.
+* Fixed `BOOST_TEST_EQ`, `BOOST_TEST_NE` for character types under C++20.
+* Revised 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.
+* Added `BOOST_TEST_WITH` to Lightweight Test.
+
+[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

@@ -34,27 +34,41 @@ criteria for inclusion is that the utility component be:
 * simple,
 * used by other Boost libraries, and
 * not dependent on any other Boost modules except Core
-  itself, Config, Assert, Static Assert, or Predef.
+  itself, Config, Assert, StaticAssert, or ThrowException.
 
 [endsect]
 
+[include changes.qbk]
+
 [include addressof.qbk]
+[include allocator_access.qbk]
+[include allocator_traits.qbk]
+[include bit.qbk]
 [include checked_delete.qbk]
+[include cmath.qbk]
+[include default_allocator.qbk]
 [include demangle.qbk]
 [include empty_value.qbk]
 [include enable_if.qbk]
 [include exchange.qbk]
 [include explicit_operator_bool.qbk]
+[include first_scalar.qbk]
 [include ignore_unused.qbk]
 [include is_same.qbk]
 [include lightweight_test.qbk]
 [include no_exceptions_support.qbk]
+[include noinit_adaptor.qbk]
 [include noncopyable.qbk]
 [include null_deleter.qbk]
+[include nvp.qbk]
 [include pointer_traits.qbk]
 [include quick_exit.qbk]
 [include ref.qbk]
 [include scoped_enum.qbk]
+[include span.qbk]
 [include swap.qbk]
 [include typeinfo.qbk]
+[include type_name.qbk]
 [include uncaught_exceptions.qbk]
+[include use_default.qbk]
+[include verbose_terminate_handler.qbk]

doc/default_allocator.qbk

@@ -0,0 +1,140 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:default_allocator default_allocator]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+The header <boost/core/default_allocator.hpp> provides the class template
+`boost::default_allocator` to serve as a minimal default allocator that:
+
+* Like C++2a's `std::allocator`, does not provide members such as `construct()`
+and `destroy()` to be eligible for optimizations by allocator-aware code that
+detects the absence of these members to provide more optimal construction.
+* Supports `BOOST_NO_EXCEPTIONS` in allocation.
+* Does not have `std` as an associated namespace.
+
+[endsect]
+
+[section Examples]
+
+The following snippet shows the use of this allocator as the default allocator
+for a container.
+
+```
+template<class Key, class Compare = std::less<Key>,
+    class Allocator = boost::default_allocator<Key> >
+class FlatSet;
+```
+
+Facilities like `make_shared` can be implemented using `allocate_shared` with
+`default_allocator`.
+
+```
+template<class T, class... Args>
+enable_if_t<!is_array_v<T>, shared_ptr<T> >
+make_shared(Args&&... args)
+{
+    return allocate_shared<T>(boost::default_allocator<remove_cv_t<T> >(),
+        std::forward<Args>(args)...);
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class T>
+struct default_allocator {
+    typedef T value_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef std::add_lvalue_reference_t<T> reference;
+    typedef std::add_lvalue_reference_t<const T> const_reference;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef ``['true_type]`` propagate_on_container_move_assignment;
+    typedef ``['true_type]`` is_always_equal;
+
+    template<class U>
+    struct rebind {
+        typedef default_allocator<U> other;
+    };
+
+    constexpr default_allocator() = default;
+
+    template<class U>
+    constexpr default_allocator(const default_allocator<U>&) noexcept { }
+
+    constexpr std::size_t max_size() const noexcept;
+    T* allocate(std::size_t n);
+    void deallocate(T* p, std::size_t);
+};
+
+template<class T, class U>
+constexpr bool operator==(const default_allocator<T>&,
+    const default_allocator<U>&) noexcept;
+
+template<class T, class U>
+constexpr bool operator!=(const default_allocator<T>&,
+    const default_allocator<U>&) noexcept;
+
+} /* boost */
+```
+
+[section Members]
+
+[variablelist
+[[`constexpr std::size_t max_size() const noexcept;`]
+[[variablelist
+[[Returns][The largest value `N` for which the call `allocate(N)` might
+succeed.]]]]]
+[[`T* allocate(std::size_t n);`]
+[[variablelist
+[[Returns]
+[A pointer to the initial element of an array of storage of size
+`n * sizeof(T)`, aligned appropriately for objects of type `T`.]]
+[[Remarks][The storage is obtained by calling `::operator new`.]]
+[[Throws][`std::bad_alloc` if the storage cannot be obtained.]]]]]
+[[`void deallocate(T* p, std::size_t n);`]
+[[variablelist
+[[Requires]
+[`p` shall be a pointer value obtained from `allocate()`. `n` shall equal the
+value passed as the first argument to the invocation of `allocate` which
+returned `p`.]]
+[[Effects][Deallocates the storage referenced by `p`.]]
+[[Remarks][Uses `::operator delete`.]]]]]]
+
+[endsect]
+
+[section Operators]
+
+[variablelist
+[[`template<class T, class U> constexpr bool operator==(const
+default_allocator<T>&, const default_allocator<U>&) noexcept;`]
+[[variablelist
+[[Returns][`true`.]]]]]
+[[`template<class T, class U> constexpr bool operator!=(const
+default_allocator<T>&, const default_allocator<U>&) noexcept;`]
+[[variablelist
+[[Returns][`false`.]]]]]]
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/empty_value.qbk

@@ -90,13 +90,15 @@ public:
     empty_value() = default;
 
     template<class... Args>
-    explicit empty_value(empty_init_t, Args&&... args);
+    empty_value(empty_init_t, Args&&... args);
 
     const T& get() const noexcept;
 
     T& get() noexcept;
 };
 
+inline constexpr empty_init_t empty_init{ };
+
 } /* boost */
 ```
 
@@ -111,7 +113,8 @@ public:
 
 [section Member types]
 
-[variablelist [[`type`][The template parameter `T`]]]
+[variablelist
+[[`type`][The template parameter `T`]]]
 
 [endsect]
 

doc/exchange.qbk

@@ -18,7 +18,8 @@ Distributed under the Boost Software License, Version 1.0.
 
 The header <boost/core/exchange.hpp> provides the function template
 `boost::exchange` which is an implementation of the `std::exchange`
-function introduced in C++14.
+function introduced in C++14. `boost::exchange(o, v)` replaces the
+value of `o` with `v` and returns the old value of `o`.
 
 [endsect]
 

doc/first_scalar.qbk

@@ -0,0 +1,91 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:first_scalar first_scalar]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+The header <boost/core/first_scalar.hpp> provides the function templates
+`boost::first_scalar` that can be used to obtain 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>*`. The functions are `constexpr` and can be used
+in constant expressions.
+
+[endsect]
+
+[section Examples]
+
+The following function uses an allocator to allocate an array of arrays and
+constructs each scalar element in it.
+
+```
+#include <boost/alloc_construct.hpp>
+#include <boost/first_scalar.hpp>
+
+template<class A>
+auto create(const A& allocator)
+{
+    typename std::allocator_traits<A>::template
+        rebind_alloc<int[2][3]> other(allocator);
+    auto ptr = other.allocate(4);
+    try {
+        boost::alloc_construct_n(other,
+            boost::first_scalar(boost::to_address(ptr)), 24);
+    } catch (...) {
+        other.deallocate(ptr, 4);
+        throw;
+    }
+    return ptr;
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class T>
+constexpr T* first_scalar(T* p) noexcept;
+
+template<class T, std::size_t N>
+constexpr auto first_scalar(T (*p)[N]) noexcept;
+
+} /* boost */
+```
+
+[section Functions]
+
+[variablelist
+[[`template<class T> constexpr T* first_scalar(T* p) noexcept;`]
+[[variablelist
+[[Returns][`p`.]]]]]
+[[`template<class T, std::size_t N> constexpr auto first_scalar(T (*p)[N])
+noexcept;`]
+[[variablelist
+[[Returns][`first_scalar(&(*p)[0])`.]]]]]]
+
+[endsect]
+
+[endsect]
+
+[section History]
+
+Glen Fernandes implemented `first_scalar`. Peter Dimov suggested a change for
+GCC to support an additional `constexpr` use.
+
+[endsect]
+
+[endsect]

doc/lightweight_test.qbk

@@ -43,9 +43,11 @@ When using `lightweight_test.hpp`, *do not forget* to
 #define BOOST_TEST_GE(expr1, expr2) /*unspecified*/
 #define BOOST_TEST_CSTR_EQ(expr1, expr2) /*unspecified*/
 #define BOOST_TEST_CSTR_NE(expr1, expr2) /*unspecified*/
+#define BOOST_TEST_WITH(expr1, expr2, pred) /*unspecified*/
 #define BOOST_TEST_ALL_EQ(begin1, end1, begin2, end2) /* unspecified */
 #define BOOST_TEST_ALL_WITH(begin1, end1, begin2, end2, predicate) /* unspecified */
 #define BOOST_TEST_THROWS(expr, excep) /*unspecified*/
+#define BOOST_TEST_NO_THROW(expr) /*unspecified*/
 
 namespace boost
 {
@@ -174,6 +176,17 @@ Specialization of `BOOST_TEST_NE` which interprets `expr1` and `expr2` as pointe
 
 [endsect]
 
+[section BOOST_TEST_WITH]
+
+``
+BOOST_TEST_WITH(expr1, expr2, pred)
+``
+
+If `pred(expr1, expr2)` is not true increases the error count and outputs a
+message containing both expressions.
+
+[endsect]
+
 [section BOOST_TEST_ALL_EQ]
 
 ``
@@ -209,6 +222,20 @@ nothing and `expr` is not evaluated.
 
 [endsect]
 
+[section BOOST_TEST_NO_THROW]
+
+``
+BOOST_TEST_NO_THROW(expr)
+``
+
+If `BOOST_NO_EXCEPTIONS` is *not* defined and if `expr` throws an exception,
+increases the error count and outputs a message containing the expression
+and (if possible) the exception message.
+
+If `BOOST_NO_EXCEPTIONS` is defined, `expr` is evaluated.
+
+[endsect]
+
 [section report_errors]
 
 ``

doc/noinit_adaptor.qbk

@@ -0,0 +1,163 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:noinit_adaptor noinit_adaptor]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+The header <boost/core/noinit_adaptor.hpp> provides the class
+template `boost::noinit_adaptor` that converts any allocator into
+one whose `construct(ptr)` performs default initialization via placement new,
+and whose `destroy(ptr)` invokes `value_type` destructor directly.
+
+[endsect]
+
+[section Examples]
+
+The following example shows use of this allocator adaptor to achieve default
+initialization of elements of a trivial type, which are later assigned values.
+
+```
+#include <boost/core/noinit_adaptor.hpp>
+#include <numeric>
+#include <vector>
+
+int main()
+{
+    std::vector<int, boost::noinit_adaptor<std::allocator<int> > > v(5);
+    std::iota(v.begin(), v.end(), 1);
+}
+```
+
+The `allocate_shared_noinit` function templates are now implemented simply
+using `allocate_shared` with `noinit_adaptor`.
+
+```
+template<class T, class A>
+enable_if_t<is_unbounded_array_v<T>, shared_ptr<T> >
+allocate_shared_noinit(const A& a, size_t n)
+{
+    return allocate_shared<T>(boost::noinit_adapt(a), n);
+}
+
+template<class T, class A>
+enable_if_t<!is_unbounded_array_v<T>, shared_ptr<T> >
+allocate_shared_noinit(const A& a)
+{
+    return allocate_shared<T>(boost::noinit_adapt(a));
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class A>
+struct noinit_adaptor
+    : A {
+    template<class U>
+    struct rebind {
+        typedef noinit_adaptor<allocator_rebind_t<A, U> > other;
+    };
+
+    noinit_adaptor() noexcept;
+
+    template<class U>
+    noinit_adaptor(U&& u) noexcept;
+
+    template<class U>
+    noinit_adaptor(const noinit_adaptor<U>& u) noexcept;
+
+    template<class U>
+    void construct(U* p);
+
+    template<class U>
+    void destroy(U* p);
+};
+
+template<class T, class U>
+bool operator==(const noinit_adaptor<T>& lhs,
+    const noinit_adaptor<U>& rhs) noexcept;
+
+template<class T, class U>
+bool operator!=(const noinit_adaptor<T>& lhs,
+    const noinit_adaptor<U>& rhs) noexcept;
+
+template<class A>
+noinit_adaptor<A> noinit_adapt(const A& a) noexcept;
+
+} /* boost */
+```
+
+[section Constructors]
+
+[variablelist
+[[`noinit_adaptor() noexcept;`]
+[[variablelist
+[[Effects][Value initializes the A base class.]]]]]
+[[`template<class U> noinit_adaptor(U&& u) noexcept;`]
+[[variablelist
+[[Requires][`A` shall be constructible from `U`.]]
+[[Effects][Initializes the `A` base class with `std::forward<U>(u)`.]]]]]
+[[`template<class U> noinit_adaptor(const noinit_adaptor<U>& u) noexcept;`]
+[[variablelist
+[[Requires][`A` shall be constructible from `U`.]]
+[[Effects][Initializes the `A` base class with
+`static_cast<const A&>(u)`.]]]]]]
+
+[endsect]
+
+[section Member functions]
+
+[variablelist
+[[`template<class U> void construct(U* p);`]
+[[variablelist
+[[Effects][`::new((void*)p) U`.]]]]]
+[[`template<class U> void destroy(U* p);`]
+[[variablelist
+[[Effects][`p->~U()`.]]]]]]
+
+[endsect]
+
+[section Operators]
+
+[variablelist
+[[`template<class T, class U> constexpr bool
+operator==(const noinit_adaptor<T>& lhs,
+const noinit_adaptor<U>& rhs) noexcept;`]
+[[variablelist
+[[Returns][`static_cast<const T&>(lhs) == static_cast<const U&>(rhs)`.]]]]]
+[[`template<class T, class U> constexpr bool
+operator!=(const noinit_adaptor<T>& lhs,
+const noinit_adaptor<U>& rhs) noexcept;`]
+[[variablelist
+[[Returns][`!(lhs == rhs)`.]]]]]]
+
+[endsect]
+
+[section Free functions]
+
+[variablelist
+[[`template<class A> noinit_adaptor<A> noinit_adapt(const A& a) noexcept;`]
+[[variablelist
+[[Returns][`noinit_adaptor<A>(a)`.]]]]]]
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/nvp.qbk

@@ -0,0 +1,108 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:nvp nvp]
+
+[section Overview]
+
+The header <boost/core/nvp.hpp> provides the class template `boost::nvp` that
+pairs a name (`const char*`) with the address of a value (`T*`). It is the new
+implementation of the NVP type previously provided by the Boost Serialization
+library. This type now lives in the Core library so that other Boost libraries
+can support named value serialization without taking a dependency on the
+Serialization library.
+
+[endsect]
+
+[section Examples]
+
+The following snippet shows use in a member serialize function:
+
+```
+template<class A>
+void serialize(A& archive, unsigned)
+{
+    archive & boost::make_nvp("x", x_) & boost::make_nvp("y", y_);
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class T>
+class nvp {
+public:
+    nvp(const char* name, T& value) noexcept;
+
+    const char* name() const noexcept;
+
+    T& value() const noexcept;
+
+    const T& const_value() const noexcept;
+};
+
+template<class T>
+const nvp<T> make_nvp(const char* name, T& value) noexcept;
+
+} /* boost */
+
+#define BOOST_NVP(object) ``['see below]``
+```
+
+[section Constructors]
+
+[variablelist
+[[`nvp(const char* name, T& value) noexcept;`]
+[Initializes the stored name pointer with `name` and the value pointer with
+`addressof(value)`.]]]
+
+[endsect]
+
+[section Members]
+
+[variablelist
+[[`const char* name() const noexcept;`]
+[Returns a pointer to the name.]]
+[[`T& value() const noexcept;`]
+[Returns a reference to the value.]]
+[[`const T& const_value() const noexcept;`]
+[Returns a reference to the value.]]]
+
+[endsect]
+
+[section Functions]
+
+[variablelist
+[[`template<class T> const nvp<T> make_nvp(const char* name, T& value)
+noexcept;`]
+[Returns `nvp<T>(name, value)`.]]]
+
+[endsect]
+
+[section Macros]
+
+[variablelist
+[[`#define BOOST_NVP(object) see below`]
+[Expands to `boost::make_nvp(BOOST_STRINGIZE(object), object)`.]]]
+
+[endsect]
+
+[endsect]
+
+[section History]
+
+Robert Ramey originally implemented NVP in the Serialization library. Glen
+Fernandes implemented this new (but compatible) version in the Core library.
+
+[endsect]
+
+[endsect]

doc/pointer_traits.qbk

@@ -1,5 +1,5 @@
 [/
-Copyright 2017-2018 Glen Joseph Fernandes
+Copyright 2017-2021 Glen Joseph Fernandes
 (glenjofe@gmail.com)
 
 Distributed under the Boost Software License, Version 1.0.
@@ -47,69 +47,89 @@ void function(Allocator& a)
 
 ```
 namespace boost {
-  template<class T> struct pointer_traits {
+
+template<class T>
+struct pointer_traits {
     typedef T pointer;
     typedef ``['see below]`` element_type;
     typedef ``['see below]`` difference_type;
 
-    template<class U> struct rebind_to { typedef ``['see below]`` type; };
-    template<class U> using rebind = typename rebind_to<U>::type;
+    template<class U>
+    struct rebind_to {
+        typedef ``['see below]`` type;
+    };
 
-    static pointer pointer_to(``['see below]`` v);
-  };
+    template<class U>
+    using rebind = typename rebind_to<U>::type;
 
-  template<class T> struct pointer_traits<T*> {
+    static pointer pointer_to(element_type& v);
+};
+
+template<class T>
+struct pointer_traits<T*> {
     typedef T* pointer;
     typedef T element_type;
     typedef std::ptrdiff_t difference_type;
 
-    template<class U> struct rebind_to { typedef U* type; };
-    template<class U> using rebind = typename rebind_to<U>::type;
+    template<class U>
+    struct rebind_to {
+        typedef U* type;
+    };
+
+    template<class U>
+    using rebind = typename rebind_to<U>::type;
 
     static pointer pointer_to(``['see below]`` v) noexcept;
-  };
+};
 
-  template<class T>
-  constexpr T* to_address(T* v) noexcept;
+template<class T>
+constexpr T* to_address(T* v) noexcept;
 
-  template<class T>
-  auto to_address(const T& v) noexcept;
-}
+template<class T>
+auto to_address(const T& v) noexcept;
+
+} // boost
 ```
 
+[section Overview]
+
+If the member type `element_type` is not defined, then all other members are
+also not defined (`pointer_traits` is SFINAE-friendly).
+
+[endsect]
+
 [section Member types]
 
 [variablelist
 [[`typedef` ['see below] `element_type;`]
 [`T::element_type` if such a type exists; otherwise `U` if `T` is a class
   template instantiation of the form `Pointer<U, Args>`, where `Args` is zero
-  or more type arguments; otherwise the specialization is ill-formed.]]
+  or more type arguments; otherwise the member is not defined.]]
 [[`typedef` ['see below] `difference_type;`]
 [`T::difference_type` if such a type exists; otherwise `std::ptrdiff_t`.]]
 [[`template<class U> struct rebind_to { typedef` ['see below] `type; };`]
 [`type` is `T::rebind<U>` if such a type exists; otherwise, `Pointer<V, Args>`
   if `T` is a class template instantiation of the form `Pointer<T, Args>`,
-  where `Args` is zero or more type arguments; otherwise, the instantiation of
-  `rebind_to` is ill-formed.]]]
+  where `Args` is zero or more type arguments; otherwise, the member is not
+  defined.]]]
 
 [endsect]
 
 [section Member functions]
 
 [variablelist
-[[`static pointer pointer_traits::pointer_to(`['see below] `v);`]
+[[`static pointer pointer_traits::pointer_to(element_type& v);`]
 [[variablelist
 [[Remark]
-[If `element_type` is a void type, the type of `v` is unspecified; otherwise,
-  it is `element_type&`.]]
+[If `element_type` is a void type, or if `T::pointer_to(v)` is not well formed,
+  this member is not defined.]]
 [[Returns]
 [A pointer to `v` obtained by calling `T::pointer_to(v)`.]]]]]
-[[`static pointer pointer_traits<T*>::pointer_to(`['see below] `v) noexcept;`]
+[[`static pointer pointer_traits<T*>::pointer_to(element_type& v) noexcept;`]
 [[variablelist
 [[Remark]
-[If `element_type` is a void type, the type of `v` is unspecified; otherwise,
-  it is `element_type&`.]]
-[[Returns] [`addressof(v)`.]]]]]]
+[If `element_type` is a void type, this member is not defined.]]
+[[Returns][`addressof(v)`.]]]]]]
 
 [endsect]
 
@@ -131,9 +151,11 @@ namespace boost {
 
 [variablelist
 [[`template<class T> constexpr T* to_address(T* v) noexcept;`]
-[[variablelist [[Returns] [`v`.]]]]]
+[[variablelist
+[[Returns][`v`.]]]]]
 [[`template<class T> auto to_address(const T& v) noexcept;`]
-[[variablelist [[Returns] [`pointer_traits<T>::to_address(v)` if that
+[[variablelist
+[[Returns][`pointer_traits<T>::to_address(v)` if that
   expression is well-formed, otherwise `to_address(v.operator->())`.]]]]]]
 
 [endsect]

doc/scoped_enum.qbk

@@ -67,9 +67,9 @@ The enumeration can be forward declared:
 
     BOOST_SCOPED_ENUM_FORWARD_DECLARE(future_errc);
 
-There are however some limitations. First, the emulated scoped enum is not a C++ enum, so `is_enum< future_errc >` will be `false_type`.
+There are however some limitations. The emulated scoped enum is not a C++ enum, so `is_enum< future_errc >` will be `false_type`.
 
-Second, the emulated scoped enum can not be used in switch nor in template arguments. For these cases the user needs to use some helpers. Instead of
+The emulated scoped enum can not be used in switch nor in template arguments. For these cases the user needs to use some helpers. Instead of
 
     switch (ev)
     {
@@ -99,10 +99,29 @@ use
     {
     };
 
-Lastly, explicit conversion to the underlying type should be performed with `boost::underlying_cast` instead of `static_cast`:
+Explicit conversion to the underlying type should be performed with `boost::underlying_cast` instead of `static_cast`:
 
     unsigned int val = boost::underlying_cast< unsigned int >(ev);
 
+In C++03, scoped enums behave differently in case of calling an overloaded function when one overload takes a scoped enum as a parameter, and the other takes a parameter of an integral type. Consider the following code:
+
+    enum enum_regular { REGULAR_A, REGULAR_B };
+
+    BOOST_SCOPED_ENUM_DECLARE_BEGIN(enum_scoped)
+    {
+        a, b
+    }
+    BOOST_SCOPED_ENUM_DECLARE_END(enum_scoped)
+
+    void regular_or_int(enum_regular); // (1)
+    void regular_or_int(int);          // (2)
+    void scoped_or_int(enum_scoped);   // (3)
+    void scoped_or_int(int);           // (4)
+
+    regular_or_int(REGULAR_A);                  // calls (1) in C++03 and C++11
+    scoped_or_int(enum_scoped::a);              // calls (3) in C++11 but (4) in C++03!
+    scoped_or_int(enum_scoped(enum_scoped::a)); // calls (3) in C++03 and C++11
+
 Here is usage example:
 
     BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(algae, char)

doc/span.qbk

@@ -0,0 +1,396 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:span span]
+
+[simplesect Authors]
+
+* Glen Fernandes
+
+[endsimplesect]
+
+[section Overview]
+
+This header <boost/core/span.hpp> provides class template `span`, which is a
+view over a sequence of objects. It implements the C++20 standard library
+`std::span` facility. This implementation supports C++11 and higher.
+
+In addition to referencing the sequence of objects, the span knows the count of
+objects. There are two kinds of spans:
+
+* Dynamic size (`span<T>` or `span<T, dynamic_extent>`)
+* Static size (`span<T, N>`)
+
+Dynamic size spans have a count that can be a value known at run time. Static
+size spans have a count that must be known at compile time.
+
+[endsect]
+
+[section Examples]
+
+The following snippet shows a function to compute a SHA1 hash whose parameters
+and return type use spans.
+
+```
+auto sha1(boost::span<const unsigned char> input,
+    boost::span<unsigned char, SHA_DIGEST_LENGTH> ouput)
+{
+    SHA_CTX context;
+    SHA1_Init(&context);
+    SHA1_Update(&context, input.data(), input.size());
+    SHA1_Final(output.data(), &context);
+    return output;
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+constexpr std::size_t dynamic_extent = -1;
+
+template<class T, std::size_t E = dynamic_extent>
+class span {
+public:
+    typedef T element_type;
+    typedef std::remove_cv_t<T> value_type;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef T& reference;
+    typedef const T& const_reference;
+    typedef T* iterator;
+    typedef const T* const_iterator;
+    typedef std::reverse_iterator<T*> reverse_iterator;
+    typedef std::reverse_iterator<const T*> const_reverse_iterator;
+
+    static constexpr std::size_t extent = E;
+
+    constexpr span() noexcept;
+
+    explicit(E != dynamic_extent)
+    template<class I>
+    constexpr span(I* f, size_type c);
+
+    explicit(E != dynamic_extent)
+    template<class I, class L>
+    constexpr span(I* f, L* l);
+
+    template<std::size_t N>
+    constexpr span(type_identity_t<T> (&a)[N]);
+
+    template<class U, std::size_t N>
+    constexpr span(std::array<U, N>& a) noexcept;
+
+    template<class U, std::size_t N>
+    constexpr span(const std::array<U, N>& a) noexcept;
+
+    explicit(E != dynamic_extent)
+    template<class R>
+    constexpr span(R&& r);
+
+    explicit(E != dynamic_extent && N == dynamic_extent)
+    template<class U, std::size_t N>
+    constexpr span(const span<U, N>& s) noexcept;
+
+    template<std::size_t C>
+    constexpr span<T, C> first() const;
+
+    template<std::size_t C>
+    constexpr span<T, C> last() const;
+
+    template<std::size_t O, std::size_t C = dynamic_extent>
+    constexpr span<T, see below> subspan() const;
+
+    constexpr span<T, dynamic_extent> first(size_type c) const;
+    constexpr span<T, dynamic_extent> last(size_type c) const;
+
+    constexpr span<T, dynamic_extent> subspan(size_type o,
+        size_type c = dynamic_extent) const;
+
+    constexpr size_type size() const noexcept;
+    constexpr size_type size_bytes() const noexcept;
+    constexpr bool empty() const noexcept;
+
+    constexpr reference operator[](size_type i) const;
+    constexpr reference front() const;
+    constexpr reference back() const;
+    constexpr pointer data() const noexcept;
+
+    constexpr iterator begin() const noexcept;
+    constexpr iterator end() const noexcept;
+    constexpr reverse_iterator rbegin() const noexcept;
+    constexpr reverse_iterator rend() const noexcept;
+    constexpr const_iterator cbegin() const noexcept;
+    constexpr const_iterator cend() const noexcept;
+    constexpr const_reverse_iterator crbegin() const noexcept;
+    constexpr const_reverse_iterator crend() const noexcept;
+};
+
+template<class I, class L>
+span(I*, L) -> span<I>;
+
+template<class T, std::size_t N>
+span(T(&)[N]) -> span<T, N>;
+
+template<class T, std::size_t N>
+span(std::array<T, N>&) -> span<T, N>;
+
+template<class T, std::size_t N>
+span(const std::array<T, N>&) -> span<const T, N>;
+
+template<class R>
+span(R&&) -> span<std::remove_pointer_t<decltype(std::declval<R&>().data())> >;
+
+template<class T, std::size_t E>
+span<const std::byte, E == dynamic_extent ? dynamic_extent : sizeof(T) * E>
+as_bytes(span<T, E> s) noexcept;
+
+template<class T, std::size_t E>
+span<std::byte, E == dynamic_extent ? dynamic_extent : sizeof(T) * E>
+as_writable_bytes(span<T, E> s) noexcept;
+
+} /* boost */
+```
+
+[section Constructors]
+
+[variablelist
+[[`constexpr span() noexcept;`]
+[[variablelist
+[[Constraints][`E == dynamic_extent || E == 0` is `true`.]]
+[[Postconditions][`size() == 0 && data() == nullptr`.]]]]]
+[[`explicit(E != dynamic_extent)
+template<class I>
+constexpr span(I* f, size_type c);`]
+[[variablelist
+[[Constraints]
+[`is_convertible_v<I(*)[], T(*)[]>` is `true`.]]
+[[Preconditions]
+[[itemized_list
+[`[f, f + c)` is a valid range.]
+[If `E` is not equal to `dynamic_extent`, then `c` is equal to `E`.]]]]
+[[Effects][Constructs a `span` with data `f` and size `c`.]]
+[[Throws][Nothing.]]]]]
+[[`explicit(E != dynamic_extent)
+template<class I, class L>
+constexpr span(I* f, L* l);`]
+[[variablelist
+[[Constraints]
+[`is_convertible_v<I(*)[], T(*)[]>` is `true`.]]
+[[Preconditions]
+[[itemized_list
+[If `E` is not equal to `dynamic_extent`, then `l - f` is equal to `E`.]
+[`[f, l)` is a valid range.]]]]
+[[Effects][Constructs a `span` with data `f` and size `l - f`.]]
+[[Throws][Nothing.]]]]]
+[[`template<std::size_t N>
+constexpr span(type_identity_t<T> (&a)[N]);`]
+[[variablelist
+[[Constraints][`E == dynamic_extent || E == N` is `true`.]]
+[[Effects][Constructs a `span` that is a view over the supplied array.]]
+[[Postconditions][`size() == N && data() == &a[0]` is `true`.]]]]]
+[[`template<class U, std::size_t N>
+constexpr span(std::array<U, N>& a) noexcept;`]
+[[variablelist
+[[Constraints]
+[[itemized_list
+[`E == dynamic_extent || E == N` is `true`, and]
+[`U(*)[]` is convertible to `T(*)[]`.]]]]
+[[Effects][Constructs a `span` that is a view over the supplied array.]]
+[[Postconditions][`size() == N && data() == a.data()` is `true`.]]]]]
+[[`template<class U, std::size_t N>
+constexpr span(const std::array<U, N>& a) noexcept;`]
+[[variablelist
+[[Constraints]
+[[itemized_list
+[`E == dynamic_extent || E == N` is `true`, and]
+[`U(*)[]` is convertible to `T(*)[]`.]]]]
+[[Effects][Constructs a `span` that is a view over the supplied array.]]
+[[Postconditions][`size() == N && data() == a.data()` is `true`.]]]]]
+[[`explicit(E != dynamic_extent)
+template<class R>
+constexpr span(R&& r);`]
+[[variablelist
+[[Constraints]
+[[itemized_list
+[`is_lvalue_reference_v<R> || is_const_v<T>` is `true`]
+[`remove_cvref_t<R>` is not a specialization of `span`,]
+[`remove_cvref_t<R>` is not a specialization of `array`,]
+[`is_array_v<remove_cvref_t<R>>` is `false`,]
+[`r.data()` is well-formed and
+`is_convertible_v<remove_pointer_t<decltype(declval<R&>().data())>(*)[],
+T(*)[]>` is `true`, and]
+[`r.size()` is well-formed and
+`is_convertible_v<decltype(declval<R&>().size()), size_t>` is `true`.]]]]
+[[Effects][Constructs a `span` with data `r.data()` and size `r.size()`.]]
+[[Throws][What and when r.data() and r.size() throw.]]]]]
+[[`explicit(E != dynamic_extent && N == dynamic_extent)
+template<class U, std::size_t N>
+constexpr span(const span<U, N>& s) noexcept;`]
+[[variablelist
+[[Constraints]
+[[itemized_list
+[`E == dynamic_extent || N == dynamic_extent || E == N` is `true`, and]
+[`is_convertible_v<U(*)[], T(*)[]>` is `true`.]]]]
+[[Preconditions]
+[If `E` is not equal to `dynamic_extent`, then `s.size()` is equal to `E`.]]
+[[Effects]
+[Constructs a `span` that is a view over the range
+`[s.data(), s.data() + s.size())`.]]
+[[Postconditions][`size() == s.size() && data() == s.data()`.]]]]]]
+
+[endsect]
+
+[section Subviews]
+
+[variablelist
+[[`template<std::size_t C> constexpr span<T, C> first() const;`]
+[[variablelist
+[[Mandates][`C <= E` is `true`.]]
+[[Preconditions][`C <= size()` is `true`.]]
+[[Effects]
+[Equivalent to `return R{data(), C};` where `R` is the return type.]]]]]
+[[`template<std::size_t C> constexpr span<T, C> last() const;`]
+[[variablelist
+[[Mandates][`C <= E` is `true`.]]
+[[Preconditions][`C <= size()` is `true`.]]
+[[Effects]
+[Equivalent to `return R{data() + (size() - C), C};` where `R` is the return
+type.]]]]]
+[[`template<std::size_t O, std::size_t C = dynamic_extent>
+constexpr span<T, see below> subspan() const;`]
+[[variablelist
+[[Mandates][`O <= E && (C == dynamic_extent || C <= E - O)` is `true`.]]
+[[Preconditions]
+[`O <= size() && (C == dynamic_extent || C <= size() - O)` is `true`.]]
+[[Effects]
+[Equivalent to
+`return span<T, see below>(data() + O,
+C != dynamic_extent ? C : size() - O);`.]]
+[[Remarks]
+[The second template argument of the returned span type is:
+`C != dynamic_extent ? C : (E != dynamic_extent ? E - O :
+dynamic_extent)`]]]]]
+[[`constexpr span<T, dynamic_extent> first(size_type c) const;`]
+[[variablelist
+[[Preconditions][`c <= size()` is `true`.]]
+[[Effects][Equivalent to: `return {data(), c};`]]]]]
+[[`constexpr span<T, dynamic_extent> last(size_type c) const;`]
+[[variablelist
+[[Preconditions][`c <= size()` is `true`.]]
+[[Effects][Equivalent to: `return {data() + (size() - c), c};`]]]]]
+[[`constexpr span<T, dynamic_extent> subspan(size_type o,
+size_type c = dynamic_extent) const;`]
+[[variablelist
+[[Preconditions]
+[`o <= size() && (c == dynamic_extent || o + c <= size())` is `true`.]]
+[[Effects]
+[Equivalent to:
+`return {data() + o, c == dynamic_extent ? size() - o : c};`]]]]]]
+
+[endsect]
+
+[section Observers]
+
+[variablelist
+[[`constexpr size_type size() const noexcept;`]
+[[variablelist
+[[Returns][The number of elements in the span.]]]]]
+[[`constexpr size_type size_bytes() const noexcept;`]
+[[variablelist
+[[Effects][Equivalent to: `return size() * sizeof(T);`]]]]]
+[[`constexpr bool empty() const noexcept;`]
+[[variablelist
+[[Effects][Equivalent to: `return size() == 0;`]]]]]]
+
+[endsect]
+
+[section Element access]
+
+[variablelist
+[[`constexpr reference operator[](size_type i) const;`]
+[[variablelist
+[[Preconditions][`i < size()` is `true`.]]
+[[Effects][Equivalent to: `return *(data() + i);`]]]]]
+[[`constexpr reference front() const;`]
+[[variablelist
+[[Preconditions][`empty()` is `false`.]]
+[[Effects][Equivalent to: `return *data();`]]]]]
+[[`constexpr reference back() const;`]
+[[variablelist
+[[Preconditions][`empty()` is `false`.]]
+[[Effects][Equivalent to: `return *(data() + (size() - 1);`]]]]]
+[[`constexpr pointer data() const noexcept;`]
+[[variablelist
+[[Returns][A pointer to the first element in the span.]]]]]]
+
+[endsect]
+
+[section Iterator support]
+
+[variablelist
+[[`constexpr iterator begin() const noexcept;`]
+[[variablelist
+[[Returns][A constant iterator referring to the first element in the span. If `empty()`,
+then it returns the same value as `cend()`.]]]]]
+[[`constexpr iterator end() const noexcept;`]
+[[variablelist
+[[Returns][A constant iterator which is the past-the-end value.]]]]]
+[[`constexpr reverse_iterator rbegin() const noexcept;`]
+[[variablelist
+[[Effects][Equivalent to: `return reverse_iterator(end());`]]]]]
+[[`constexpr reverse_iterator rend() const noexcept;`]
+[[variablelist
+[[Effects][Equivalent to: `return reverse_iterator(begin());`]]]]]
+[[`constexpr const_iterator cbegin() const noexcept;`]
+[[variablelist
+[[Returns]
+[A constant iterator referring to the first element in the span. If `empty()`,
+then it returns the same value as `cend()`.]]]]]
+[[`constexpr const_iterator cend() const noexcept;`]
+[[variablelist
+[[Returns][A constant iterator which is the past-the-end value.]]]]]
+[[`constexpr const_reverse_iterator crbegin() const noexcept;`]
+[[variablelist
+[[Effects][Equivalent to: `return const_reverse_iterator(cend());`]]]]]
+[[`constexpr const_reverse_iterator crend() const noexcept;`]
+[[variablelist
+[[Effects]
+[Equivalent to: `return const_reverse_iterator(cbegin());`]]]]]]
+
+[endsect]
+
+[section Views of object representation]
+
+[variablelist
+[[`template<class T, std::size_t E>
+span<const std::byte, E == dynamic_extent ? dynamic_extent : sizeof(T) * E>
+as_bytes(span<T, E> s) noexcept;`]
+[[variablelist
+[[Effects]
+[Equivalent to:
+`return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};`.]]]]]
+[[`template<class T, std::size_t E>
+span<std::byte, E == dynamic_extent ? dynamic_extent : sizeof(T) * E>
+as_writable_bytes(span<T, E> s) noexcept;`]
+[[variablelist
+[[Constraints][`is_const_v<T>` is `false`.]]
+[[Effects]
+[Equivalent to: `return R{reinterpret_cast<byte*>(s.data()), s.size_bytes()};`
+where `R` is the return type.]]]]]]
+
+[endsect]
+
+[endsect]
+
+[endsect]

doc/string_view.qbk

@@ -0,0 +1,768 @@
+[/
+  Copyright 2021 Peter Dimov
+  Distributed under the Boost Software License, Version 1.0.
+  https://boost.org/LICENSE_1_0.txt
+]
+
+[section:string_view string_view]
+
+[simplesect Authors]
+
+* Peter Dimov
+
+[endsimplesect]
+
+[section Header <boost/core/string_view.hpp>]
+
+The header `<boost/core/string_view.hpp>` defines `boost::core::string_view`,
+a portable and interoperable implementation of `std::string_view`.
+
+Unlike `boost::string_view`, `boost::core::string_view` has implicit
+conversions from and to `std::string_view`, which allows Boost libraries that
+support C++11/C++14 to use it in interfaces without forcing users to forgo the
+use of `std::string_view` in their code.
+
+[section Synopsis]
+
+``
+namespace boost
+{
+namespace core
+{
+
+template<class Ch> class basic_string_view
+{
+public:
+
+    // types
+
+    typedef std::char_traits<Ch> traits_type;
+    typedef Ch value_type;
+    typedef Ch* pointer;
+    typedef Ch const* const_pointer;
+    typedef Ch& reference;
+    typedef Ch const& const_reference;
+    typedef Ch const* const_iterator;
+    typedef const_iterator iterator;
+    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+    typedef const_reverse_iterator reverse_iterator;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+
+    // npos
+
+    static constexpr size_type npos = static_cast<size_type>( -1 );
+
+public:
+
+    // construction and assignment
+
+    constexpr basic_string_view() noexcept;
+    constexpr basic_string_view( basic_string_view const& ) noexcept = default;
+    constexpr basic_string_view& operator=( basic_string_view const& ) noexcept & = default;
+    constexpr basic_string_view( Ch const* str ) noexcept;
+    constexpr basic_string_view( Ch const* str, size_type len ) noexcept;
+    constexpr basic_string_view( Ch const* begin, Ch const* end ) noexcept;
+    template<class A> basic_string_view( std::basic_string<Ch, std::char_traits<Ch>, A> const& str ) noexcept;
+    basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch>> const& str ) noexcept;
+
+    // conversions
+
+    template<class A> operator std::basic_string<Ch, std::char_traits<Ch>, A>() const;
+    template<class Ch2> operator std::basic_string_view<Ch2>() const noexcept;
+
+    // iterator support
+
+    constexpr const_iterator begin() const noexcept;
+    constexpr const_iterator end() const noexcept;
+    constexpr const_iterator cbegin() const noexcept;
+    constexpr const_iterator cend() const noexcept;
+    constexpr const_reverse_iterator rbegin() const noexcept;
+    constexpr const_reverse_iterator rend() const noexcept;
+    constexpr const_reverse_iterator crbegin() const noexcept;
+    constexpr const_reverse_iterator crend() const noexcept;
+
+    // capacity
+
+    constexpr size_type size() const noexcept;
+    constexpr size_type length() const noexcept;
+    constexpr size_type max_size() const noexcept;
+    constexpr bool empty() const noexcept;
+
+    // element access
+
+    constexpr const_reference operator[]( size_type pos ) const noexcept;
+    constexpr const_reference at( size_type pos ) const;
+    constexpr const_reference front() const noexcept;
+    constexpr const_reference back() const noexcept;
+    constexpr const_pointer data() const noexcept;
+
+    // modifiers
+
+    constexpr void remove_prefix( size_type n ) noexcept;
+    constexpr void remove_suffix( size_type n ) noexcept;
+    constexpr void swap( basic_string_view& s ) noexcept;
+
+    // string operations
+
+    constexpr size_type copy( Ch* s, size_type n, size_type pos = 0 ) const;
+    constexpr basic_string_view substr( size_type pos = 0, size_type n = npos ) const;
+
+    // compare
+
+    constexpr int compare( basic_string_view str ) const noexcept;
+    constexpr int compare( size_type pos1, size_type n1, basic_string_view str ) const;
+    constexpr int compare( size_type pos1, size_type n1, basic_string_view str, size_type pos2, size_type n2 ) const;
+    constexpr int compare( Ch const* s ) const;
+    constexpr int compare( size_type pos1, size_type n1, Ch const* s ) const;
+    constexpr int compare( size_type pos1, size_type n1, Ch const* s, size_type n2 ) const;
+
+    // starts_with
+
+    constexpr bool starts_with( basic_string_view x ) const noexcept;
+    constexpr bool starts_with( Ch x ) const noexcept;
+    constexpr bool starts_with( Ch const* x ) const noexcept;
+
+    // ends_with
+
+    constexpr bool ends_with( basic_string_view x ) const noexcept;
+    constexpr bool ends_with( Ch x ) const noexcept;
+    constexpr bool ends_with( Ch const* x ) const noexcept;
+
+    // find
+
+    constexpr size_type find( basic_string_view str, size_type pos = 0 ) const noexcept;
+    constexpr size_type find( Ch c, size_type pos = 0 ) const noexcept;
+    constexpr size_type find( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type find( Ch const* s, size_type pos = 0 ) const noexcept;
+
+    // rfind
+
+    constexpr size_type rfind( basic_string_view str, size_type pos = npos ) const noexcept;
+    constexpr size_type rfind( Ch c, size_type pos = npos ) const noexcept;
+    constexpr size_type rfind( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type rfind( Ch const* s, size_type pos = npos ) const noexcept;
+
+    // find_first_of
+
+    constexpr size_type find_first_of( basic_string_view str, size_type pos = 0 ) const noexcept;
+    constexpr size_type find_first_of( Ch c, size_type pos = 0 ) const noexcept;
+    constexpr size_type find_first_of( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type find_first_of( Ch const* s, size_type pos = 0 ) const noexcept;
+
+    // find_last_of
+
+    constexpr size_type find_last_of( basic_string_view str, size_type pos = npos ) const noexcept;
+    constexpr size_type find_last_of( Ch c, size_type pos = npos ) const noexcept;
+    constexpr size_type find_last_of( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type find_last_of( Ch const* s, size_type pos = npos ) const noexcept;
+
+    // find_first_not_of
+
+    constexpr size_type find_first_not_of( basic_string_view str, size_type pos = 0 ) const noexcept;
+    constexpr size_type find_first_not_of( Ch c, size_type pos = 0 ) const noexcept;
+    constexpr size_type find_first_not_of( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type find_first_not_of( Ch const* s, size_type pos = 0 ) const noexcept;
+
+    // find_last_not_of
+
+    constexpr size_type find_last_not_of( basic_string_view str, size_type pos = npos ) const noexcept;
+    constexpr size_type find_last_not_of( Ch c, size_type pos = npos ) const noexcept;
+    constexpr size_type find_last_not_of( Ch const* s, size_type pos, size_type n ) const noexcept;
+    constexpr size_type find_last_not_of( Ch const* s, size_type pos = npos ) const noexcept;
+
+    // contains
+
+    constexpr bool contains( basic_string_view sv ) const noexcept;
+    constexpr bool contains( Ch c ) const noexcept;
+    constexpr bool contains( Ch const* s ) const noexcept;
+
+    // relational operators
+
+    constexpr friend bool operator==( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+    constexpr friend bool operator!=( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+    constexpr friend bool operator<( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+    constexpr friend bool operator<=( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+    constexpr friend bool operator>( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+    constexpr friend bool operator>=( basic_string_view sv1, basic_string_view sv2 ) noexcept;
+};
+
+// stream inserter
+
+template<class Ch> std::basic_ostream<Ch>& operator<<( std::basic_ostream<Ch>& os, basic_string_view<Ch> str );
+
+// typedef names
+
+typedef basic_string_view<char> string_view;
+typedef basic_string_view<wchar_t> wstring_view;
+typedef basic_string_view<char16_t> u16string_view;
+typedef basic_string_view<char32_t> u32string_view;
+typedef basic_string_view<char8_t> u8string_view;
+
+} // namespace core
+} // namespace boost
+``
+
+[endsect]
+
+[section Construction]
+
+[section `constexpr basic_string_view() noexcept;`]
+
+* *Ensures:* `data() == 0`; `size() == 0`.
+
+[endsect]
+
+[section `constexpr basic_string_view( Ch const* str ) noexcept;`]
+
+* *Ensures:* `data() == str`; `size() == traits_type::length( str )`.
+
+[endsect]
+
+[section `constexpr basic_string_view( Ch const* str, size_type len ) noexcept;`]
+
+* *Ensures:* `data() == str`; `size() == len`.
+
+[endsect]
+
+[section `constexpr basic_string_view( Ch const* begin, Ch const* end ) noexcept;`]
+
+* *Requires:* `end >= begin`.
+* *Ensures:* `data() == begin`; `size() == end - begin`.
+
+[endsect]
+
+[section `template<class A> basic_string_view( std::basic_string<Ch, std::char_traits<Ch>, A> const& str ) noexcept;`]
+
+* *Ensures:* `data() == str.data()`; `size() == str.size()`.
+
+[endsect]
+
+[section `basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch>> const& str ) noexcept;`]
+
+* *Ensures:* `data() == str.data()`; `size() == str.size()`.
+
+[endsect]
+
+[endsect]
+
+[section Conversions]
+
+[section `template<class A> operator std::basic_string<Ch, std::char_traits<Ch>, A>() const;`]
+
+* *Returns:* `std::basic_string<Ch, std::char_traits<Ch>, A>( data(), size() )`.
+
+[endsect]
+
+[section `template<class Ch2> operator std::basic_string_view<Ch2>() const noexcept;`]
+
+* *Constraints:* `Ch2` is the same type as `Ch`.
+* *Returns:* `std::basic_string_view<Ch2>( data(), size() )`.
+
+[endsect]
+
+[endsect]
+
+[section Iterator Support]
+
+[section `constexpr const_iterator begin() const noexcept;`]
+
+* *Returns:* `data()`.
+
+[endsect]
+
+[section `constexpr const_iterator end() const noexcept;`]
+
+* *Returns:* `data() + size()`.
+
+[endsect]
+
+[section `constexpr const_iterator cbegin() const noexcept;`]
+
+* *Returns:* `begin()`.
+
+[endsect]
+
+[section `constexpr const_iterator cend() const noexcept;`]
+
+* *Returns:* `end()`.
+
+[endsect]
+
+[section `constexpr const_reverse_iterator rbegin() const noexcept;`]
+
+* *Returns:* `const_reverse_iterator( end() )`.
+
+[endsect]
+
+[section `constexpr const_reverse_iterator rend() const noexcept;`]
+
+* *Returns:* `const_reverse_iterator( begin() )`.
+
+[endsect]
+
+[section `constexpr const_reverse_iterator crbegin() const noexcept;`]
+
+* *Returns:* `rbegin()`.
+
+[endsect]
+
+[section `constexpr const_reverse_iterator crend() const noexcept;`]
+
+* *Returns:* `rend()`.
+
+[endsect]
+
+[endsect]
+
+[section Capacity]
+
+[section `constexpr size_type size() const noexcept;`]
+
+* *Returns:* the length of the referenced character sequence.
+
+[endsect]
+
+[section `constexpr size_type length() const noexcept;`]
+
+* *Returns:* `size()`.
+
+[endsect]
+
+[section `constexpr size_type max_size() const noexcept;`]
+
+* *Returns:* `std::numeric_limits<size_type>::max() / sizeof(Ch)`.
+
+[endsect]
+
+[section `constexpr bool empty() const noexcept;`]
+
+* *Returns:* `size() == 0`.
+
+[endsect]
+
+[endsect]
+
+[section Element Access]
+
+[section `constexpr const_reference operator[]( size_type pos ) const noexcept;`]
+
+* *Requires:* `pos < size()`.
+* *Returns:* `data()[ pos ]`.
+
+[endsect]
+
+[section `constexpr const_reference at( size_type pos ) const;`]
+
+* *Returns:* `data()[ pos ]`.
+* *Throws:* `std::out_of_range` when `pos >= size()`.
+
+[endsect]
+
+[section `constexpr const_reference front() const noexcept;`]
+
+* *Requires:* `!empty()`.
+* *Returns:* `data()[ 0 ]`.
+
+[endsect]
+
+[section `constexpr const_reference back() const noexcept;`]
+
+* *Requires:* `!empty()`.
+* *Returns:* `data()[ size() - 1 ]`.
+
+[endsect]
+
+[section `constexpr const_pointer data() const noexcept;`]
+
+* *Returns:* a pointer to the beginning of the referenced character sequence.
+
+[endsect]
+
+[endsect]
+
+[section Modifiers]
+
+[section `constexpr void remove_prefix( size_type n ) noexcept;`]
+
+* *Requires:* `n <= size()`.
+* *Effects:* advances `data()` by `n` and decreases `size()` by `n`.
+
+[endsect]
+
+[section `constexpr void remove_suffix( size_type n ) noexcept;`]
+
+* *Requires:* `n <= size()`.
+* *Effects:* decreases `size()` by `n`.
+
+[endsect]
+
+[section `constexpr void swap( basic_string_view& s ) noexcept;`]
+
+* *Effects:* exchanges the contents of `*this` and `s`.
+
+[endsect]
+
+[endsect]
+
+[section String Operations]
+
+[section copy]
+
+[section `constexpr size_type copy( Ch* s, size_type n, size_type pos = 0 ) const;`]
+
+* *Effects:* copies to `s` the contents of `substr( pos, n )`.
+* *Throws:* `std::out_of_range` when `pos >= size()`.
+
+[endsect]
+
+[endsect]
+
+[section substr]
+
+[section `constexpr basic_string_view substr( size_type pos = 0, size_type n = npos ) const;`]
+
+* *Returns:* `basic_string_view( data() + pos, std::min( size() - pos, n ) )`.
+* *Throws:* `std::out_of_range` when `pos >= size()`.
+
+[endsect]
+
+[endsect]
+
+[section compare]
+
+[section `constexpr int compare( basic_string_view str ) const noexcept;`]
+
+* *Returns:*
+  * if `traits_type::compare( data(), str.data(), std::min( size(), str.size() ) )` is not zero, returns it. Otherwise,
+  * if `size() < str.size()`, returns a negative number. Otherwise,
+  * if `size() > str.size()`, returns a positive number. Otherwise,
+  * returns 0.
+
+[endsect]
+
+[section `constexpr int compare( size_type pos1, size_type n1, basic_string_view str ) const;`]
+
+* *Returns:* `substr( pos1, n1 ).compare( str )`.
+
+[endsect]
+
+[section `constexpr int compare( size_type pos1, size_type n1, basic_string_view str, size_type pos2, size_type n2 ) const;`]
+
+* *Returns:* `substr( pos1, n1 ).compare( str.substr( pos2, n2 ) )`.
+
+[endsect]
+
+[section `constexpr int compare( Ch const* s ) const noexcept;`]
+
+* *Returns:* `compare( basic_string_view( s ) )`.
+
+[endsect]
+
+[section `constexpr int compare( size_type pos1, size_type n1, Ch const* s ) const;`]
+
+* *Returns:* `substr( pos1, n1 ).compare( basic_string_view( s ) )`.
+
+[endsect]
+
+[section `constexpr int compare( size_type pos1, size_type n1, Ch const* s, size_type n2 ) const;`]
+
+* *Returns:* `substr( pos1, n1 ).compare( basic_string_view( s, n2 ) )`.
+
+[endsect]
+
+[endsect]
+
+[section starts_with]
+
+[section `constexpr bool starts_with( basic_string_view x ) const noexcept;`]
+
+* *Returns:* `substr( 0, x.size() ) == x`.
+
+[endsect]
+
+[section `constexpr bool starts_with( Ch x ) const noexcept;`]
+
+* *Returns:* `starts_with( basic_string_view( &x, 1 ) )`.
+
+[endsect]
+
+[section `constexpr bool starts_with( Ch const* x ) const noexcept;`]
+
+* *Returns:* `starts_with( basic_string_view( x ) )`.
+
+[endsect]
+
+[endsect]
+
+[section ends_with]
+
+[section `constexpr bool ends_with( basic_string_view x ) const noexcept;`]
+
+* *Returns:* `size() >= x.size() && substr( size() - x.size(), x.size() ) == x`.
+
+[endsect]
+
+[section `constexpr bool ends_with( Ch x ) const noexcept;`]
+
+* *Returns:* `ends_with( basic_string_view( &x, 1 ) )`.
+
+[endsect]
+
+[section `constexpr bool ends_with( Ch const* x ) const noexcept;`]
+
+* *Returns:* `ends_with( basic_string_view( x ) )`.
+
+[endsect]
+
+[endsect]
+
+[endsect]
+
+[section Searching]
+
+[section find]
+
+[section `constexpr size_type find( basic_string_view str, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* The lowest position `i` such that `i >= pos` and `substr( i, str.size() ) == str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type find( Ch c, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `find( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find( Ch const* s, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section rfind]
+
+[section `constexpr size_type rfind( basic_string_view str, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* The highest position `i` such that `i <= pos` and `substr( i, str.size() ) == str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type rfind( Ch c, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `rfind( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type rfind( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `rfind( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type rfind( Ch const* s, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `rfind( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section find_first_of]
+
+[section `constexpr size_type find_first_of( basic_string_view str, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* The lowest position `i` such that `i >= pos` and the character at position `i` is equal to one of the characters in `str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type find_first_of( Ch c, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find_first_of( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_first_of( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `find_first_of( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_first_of( Ch const* s, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find_first_of( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section find_last_of]
+
+[section `constexpr size_type find_last_of( basic_string_view str, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* The highest position `i` such that `i <= pos` and the character at position `i` is equal to one of the characters in `str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type find_last_of( Ch c, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `find_last_of( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_last_of( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `find_last_of( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_last_of( Ch const* s, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `find_last_of( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section find_first_not_of]
+
+[section `constexpr size_type find_first_not_of( basic_string_view str, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* The lowest position `i` such that `i >= pos` and the character at position `i` is not equal to one of the characters in `str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type find_first_not_of( Ch c, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find_first_not_of( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_first_not_of( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `find_first_not_of( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_first_not_of( Ch const* s, size_type pos = 0 ) const noexcept;`]
+
+* *Returns:* `find_first_not_of( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section find_last_not_of]
+
+[section `constexpr size_type find_last_not_of( basic_string_view str, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* The highest position `i` such that `i <= pos` and the character at position `i` is not equal to one of the characters in `str`, or `npos` if such a position doesn't exist.
+
+[endsect]
+
+[section `constexpr size_type find_last_not_of( Ch c, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `find_last_not_of( basic_string_view( &c, 1 ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_last_not_of( Ch const* s, size_type pos, size_type n ) const noexcept;`]
+
+* *Returns:* `find_last_not_of( basic_string_view( s, n ), pos )`.
+
+[endsect]
+
+[section `constexpr size_type find_last_not_of( Ch const* s, size_type pos = npos ) const noexcept;`]
+
+* *Returns:* `find_last_not_of( basic_string_view( s ), pos )`.
+
+[endsect]
+
+[endsect]
+
+[section contains]
+
+[section `constexpr bool contains( basic_string_view sv ) const noexcept;`]
+
+* *Returns:* `find( sv ) != npos`.
+
+[endsect]
+
+[section `constexpr bool contains( Ch c ) const noexcept;`]
+
+* *Returns:* `find( c ) != npos`.
+
+[endsect]
+
+[section `constexpr bool contains( Ch const* s ) const noexcept;`]
+
+* *Returns:* `find( s ) != npos`.
+
+[endsect]
+
+[endsect]
+
+[endsect]
+
+[section Relational Operators]
+
+[section `constexpr friend bool operator==( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) == 0`.
+
+[endsect]
+
+[section `constexpr friend bool operator!=( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) != 0`.
+
+[endsect]
+
+[section `constexpr friend bool operator<( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) < 0`.
+
+[endsect]
+
+[section `constexpr friend bool operator<=( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) <= 0`.
+
+[endsect]
+
+[section `constexpr friend bool operator>( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) > 0`.
+
+[endsect]
+
+[section `constexpr friend bool operator>=( basic_string_view sv1, basic_string_view sv2 ) noexcept;`]
+
+* *Returns:* `sv1.compare( sv2 ) >= 0`.
+
+[endsect]
+
+[endsect]
+
+[section Stream Inserter]
+
+[section `template<class Ch> std::basic_ostream<Ch>& operator<<( std::basic_ostream<Ch>& os, basic_string_view<Ch> str );`]
+
+* *Effects:* equivalent to `os << x`, where `x` is a pointer to a null-terminated character sequence with the same contents as `str`.
+
+[endsect]
+
+[endsect]
+
+[endsect]
+
+[endsect]

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]

doc/use_default.qbk

@@ -0,0 +1,47 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[section:use_default use_default]
+
+[section Overview]
+
+The header <boost/core/use_default.hpp> provides the type `boost::use_default`
+which is used by other Boost libraries as a sentinel type in a templates to
+indicate defaults.
+
+[endsect]
+
+[section Example]
+
+```
+template<class Derived, class Base,
+   class Value = boost::use_default,
+   class CategoryOrTraversal = boost::use_default,
+   class Reference = boost::use_default,
+   class Difference = boost::use_default>
+class iterator_adaptor;
+
+template<class Value>
+class node_iterator
+    : public iterator_adaptor<node_iterator<Value>, Value*,
+        boost::use_default, boost::forward_traversal_tag>;
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+  struct use_default { };
+}
+```
+
+[endsect]
+
+[endsect]

doc/verbose_terminate_handler.qbk

@@ -0,0 +1,70 @@
+[/
+  Copyright 2022 Peter Dimov
+  Distributed under the Boost Software License, Version 1.0.
+  https://boost.org/LICENSE_1_0.txt
+]
+
+[section:verbose_terminate_handler verbose_terminate_handler]
+
+[simplesect Authors]
+
+* Peter Dimov
+
+[endsimplesect]
+
+[section Header <boost/core/verbose_terminate_handler.hpp>]
+
+The header `<boost/core/verbose_terminate_handler.hpp>` defines
+the function `void boost::core::verbose_terminate_handler()`. Its
+purpose is to be set as a terminate handler as in
+```
+    std::set_terminate( boost::core::verbose_terminate_handler );
+```
+
+When invoked, the function prints information about the current
+uncaught exception to `stderr` and then calls `std::abort`.
+
+[section Synopsis]
+
+``
+namespace boost
+{
+namespace core
+{
+
+[[noreturn]] void verbose_terminate_handler();
+
+} // namespace core
+} // namespace boost
+``
+
+[endsect]
+
+[section Example]
+
+```
+#include <boost/core/verbose_terminate_handler.hpp>
+#include <boost/throw_exception.hpp>
+#include <exception>
+
+int main()
+{
+    std::set_terminate( boost::core::verbose_terminate_handler );
+    boost::throw_with_location( std::exception() );
+}
+```
+
+Sample output:
+```
+std::terminate called after throwing an exception:
+
+      type: class boost::detail::with_throw_location<class std::exception>
+    what(): Unknown exception
+  location: example.cpp:8:12 in function 'main'
+```
+
+[endsect]
+
+[endsect]
+
+[endsect]

include/boost/core/addressof.hpp

@@ -125,7 +125,7 @@ template<class T>
 BOOST_FORCEINLINE T*
 addressof(T& o) BOOST_NOEXCEPT
 {
-#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) || \
+#if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x610)) || \
     BOOST_WORKAROUND(__SUNPRO_CC, <= 0x5120)
     return boost::detail::addrof<T>::get(o, 0);
 #else
@@ -151,7 +151,7 @@ addressof(T (&o)[N]) BOOST_NOEXCEPT
 }
 #endif
 
-#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+#if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x564))
 template<class T, std::size_t N>
 BOOST_FORCEINLINE
 T (*addressof(T (&o)[N]) BOOST_NOEXCEPT)[N]

include/boost/core/alloc_construct.hpp

@@ -0,0 +1,95 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_ALLOC_CONSTRUCT_HPP
+#define BOOST_CORE_ALLOC_CONSTRUCT_HPP
+
+/*
+This functionality is now in <boost/core/allocator_access.hpp>.
+*/
+#include <boost/core/noinit_adaptor.hpp>
+
+namespace boost {
+
+template<class A, class T>
+inline void
+alloc_destroy(A& a, T* p)
+{
+    boost::allocator_destroy(a, p);
+}
+
+template<class A, class T>
+inline void
+alloc_destroy_n(A& a, T* p, std::size_t n)
+{
+    boost::allocator_destroy_n(a, p, n);
+}
+
+template<class A, class T>
+inline void
+alloc_construct(A& a, T* p)
+{
+    boost::allocator_construct(a, p);
+}
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+template<class A, class T, class U, class... V>
+inline void
+alloc_construct(A& a, T* p, U&& u, V&&... v)
+{
+    boost::allocator_construct(a, p, std::forward<U>(u),
+        std::forward<V>(v)...);
+}
+#else
+template<class A, class T, class U>
+inline void
+alloc_construct(A& a, T* p, U&& u)
+{
+    boost::allocator_construct(a, p, std::forward<U>(u));
+}
+#endif
+#else
+template<class A, class T, class U>
+inline void
+alloc_construct(A& a, T* p, const U& u)
+{
+    boost::allocator_construct(a, p, u);
+}
+
+template<class A, class T, class U>
+inline void
+alloc_construct(A& a, T* p, U& u)
+{
+    boost::allocator_construct(a, p, u);
+}
+#endif
+
+template<class A, class T>
+inline void
+alloc_construct_n(A& a, T* p, std::size_t n)
+{
+    boost::allocator_construct_n(a, p, n);
+}
+
+template<class A, class T>
+inline void
+alloc_construct_n(A& a, T* p, std::size_t n, const T* l, std::size_t m)
+{
+    boost::allocator_construct_n(a, p, n, l, m);
+}
+
+template<class A, class T, class I>
+inline void
+alloc_construct_n(A& a, T* p, std::size_t n, I b)
+{
+    boost::allocator_construct_n(a, p, n, b);
+}
+
+} /* boost */
+
+#endif

include/boost/core/allocator_access.hpp

@@ -0,0 +1,820 @@
+/*
+Copyright 2020-2022 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_ALLOCATOR_ACCESS_HPP
+#define BOOST_CORE_ALLOCATOR_ACCESS_HPP
+
+#include <boost/config.hpp>
+#include <boost/core/pointer_traits.hpp>
+#include <limits>
+#include <new>
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+#include <type_traits>
+#endif
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#include <utility>
+#endif
+
+#if defined(BOOST_GCC_VERSION) && (BOOST_GCC_VERSION >= 40300)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#elif defined(BOOST_INTEL) && defined(_MSC_VER) && (_MSC_VER >= 1500)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#elif defined(BOOST_MSVC) && (BOOST_MSVC >= 1400)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#elif defined(BOOST_CLANG) && !defined(__CUDACC__)
+#if __has_feature(is_empty)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#endif
+#elif defined(__SUNPRO_CC) && (__SUNPRO_CC >= 0x5130)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __oracle_is_empty(T)
+#elif defined(__ghs__) && (__GHS_VERSION_NUMBER >= 600)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#elif defined(BOOST_CODEGEARC)
+#define BOOST_DETAIL_ALLOC_EMPTY(T) __is_empty(T)
+#endif
+
+#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
+
+namespace boost {
+
+template<class A>
+struct allocator_value_type {
+    typedef typename A::value_type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_ptr {
+    typedef typename boost::allocator_value_type<A>::type* type;
+};
+
+template<class>
+struct alloc_void {
+    typedef void type;
+};
+
+template<class A>
+struct alloc_ptr<A,
+    typename alloc_void<typename A::pointer>::type> {
+    typedef typename A::pointer type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_pointer {
+    typedef typename detail::alloc_ptr<A>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_const_ptr {
+    typedef typename boost::pointer_traits<typename
+        boost::allocator_pointer<A>::type>::template rebind_to<const typename
+            boost::allocator_value_type<A>::type>::type type;
+};
+
+template<class A>
+struct alloc_const_ptr<A,
+    typename alloc_void<typename A::const_pointer>::type> {
+    typedef typename A::const_pointer type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_const_pointer {
+    typedef typename detail::alloc_const_ptr<A>::type type;
+};
+
+namespace detail {
+
+template<class, class>
+struct alloc_to { };
+
+#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+template<template<class> class A, class T, class U>
+struct alloc_to<A<U>, T> {
+    typedef A<T> type;
+};
+
+template<template<class, class> class A, class T, class U, class V>
+struct alloc_to<A<U, V>, T> {
+    typedef A<T, V> type;
+};
+
+template<template<class, class, class> class A, class T, class U, class V1,
+    class V2>
+struct alloc_to<A<U, V1, V2>, T> {
+    typedef A<T, V1, V2> type;
+};
+#else
+template<template<class, class...> class A, class T, class U, class... V>
+struct alloc_to<A<U, V...>, T> {
+    typedef A<T, V...> type;
+};
+#endif
+
+template<class A, class T, class = void>
+struct alloc_rebind {
+    typedef typename alloc_to<A, T>::type type;
+};
+
+template<class A, class T>
+struct alloc_rebind<A, T,
+    typename alloc_void<typename A::template rebind<T>::other>::type> {
+    typedef typename A::template rebind<T>::other type;
+};
+
+} /* detail */
+
+template<class A, class T>
+struct allocator_rebind {
+    typedef typename detail::alloc_rebind<A, T>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_void_ptr {
+     typedef typename boost::pointer_traits<typename
+        boost::allocator_pointer<A>::type>::template
+            rebind_to<void>::type type;
+};
+
+template<class A>
+struct alloc_void_ptr<A,
+    typename alloc_void<typename A::void_pointer>::type> {
+    typedef typename A::void_pointer type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_void_pointer {
+    typedef typename detail::alloc_void_ptr<A>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_const_void_ptr {
+     typedef typename boost::pointer_traits<typename
+        boost::allocator_pointer<A>::type>::template
+            rebind_to<const void>::type type;
+};
+
+template<class A>
+struct alloc_const_void_ptr<A,
+    typename alloc_void<typename A::const_void_pointer>::type> {
+    typedef typename A::const_void_pointer type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_const_void_pointer {
+    typedef typename detail::alloc_const_void_ptr<A>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_diff_type {
+    typedef typename boost::pointer_traits<typename
+        boost::allocator_pointer<A>::type>::difference_type type;
+};
+
+template<class A>
+struct alloc_diff_type<A,
+    typename alloc_void<typename A::difference_type>::type> {
+    typedef typename A::difference_type type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_difference_type {
+    typedef typename detail::alloc_diff_type<A>::type type;
+};
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A, class = void>
+struct alloc_size_type {
+    typedef std::size_t type;
+};
+#else
+template<class A, class = void>
+struct alloc_size_type {
+    typedef typename std::make_unsigned<typename
+        boost::allocator_difference_type<A>::type>::type type;
+};
+#endif
+
+template<class A>
+struct alloc_size_type<A,
+    typename alloc_void<typename A::size_type>::type> {
+    typedef typename A::size_type type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_size_type {
+    typedef typename detail::alloc_size_type<A>::type type;
+};
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<bool V>
+struct alloc_bool {
+    typedef bool value_type;
+    typedef alloc_bool type;
+
+    static const bool value = V;
+
+    operator bool() const BOOST_NOEXCEPT {
+        return V;
+    }
+
+    bool operator()() const BOOST_NOEXCEPT {
+        return V;
+    }
+};
+
+template<bool V>
+const bool alloc_bool<V>::value;
+
+typedef alloc_bool<false> alloc_false;
+#else
+typedef std::false_type alloc_false;
+#endif
+
+template<class A, class = void>
+struct alloc_pocca {
+    typedef alloc_false type;
+};
+
+template<class A>
+struct alloc_pocca<A,
+    typename alloc_void<typename
+        A::propagate_on_container_copy_assignment>::type> {
+    typedef typename A::propagate_on_container_copy_assignment type;
+};
+
+} /* detail */
+
+template<class A, class = void>
+struct allocator_propagate_on_container_copy_assignment {
+    typedef typename detail::alloc_pocca<A>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_pocma {
+    typedef alloc_false type;
+};
+
+template<class A>
+struct alloc_pocma<A,
+    typename alloc_void<typename
+        A::propagate_on_container_move_assignment>::type> {
+    typedef typename A::propagate_on_container_move_assignment type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_propagate_on_container_move_assignment {
+    typedef typename detail::alloc_pocma<A>::type type;
+};
+
+namespace detail {
+
+template<class A, class = void>
+struct alloc_pocs {
+    typedef alloc_false type;
+};
+
+template<class A>
+struct alloc_pocs<A,
+    typename alloc_void<typename A::propagate_on_container_swap>::type> {
+    typedef typename A::propagate_on_container_swap type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_propagate_on_container_swap {
+    typedef typename detail::alloc_pocs<A>::type type;
+};
+
+namespace detail {
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A, class = void>
+struct alloc_equal {
+    typedef typename std::is_empty<A>::type type;
+};
+#elif defined(BOOST_DETAIL_ALLOC_EMPTY)
+template<class A, class = void>
+struct alloc_equal {
+    typedef alloc_bool<BOOST_DETAIL_ALLOC_EMPTY(A)> type;
+};
+#else
+template<class A, class = void>
+struct alloc_equal {
+    typedef alloc_false type;
+};
+#endif
+
+template<class A>
+struct alloc_equal<A,
+    typename alloc_void<typename A::is_always_equal>::type> {
+    typedef typename A::is_always_equal type;
+};
+
+} /* detail */
+
+template<class A>
+struct allocator_is_always_equal {
+    typedef typename detail::alloc_equal<A>::type type;
+};
+
+template<class A>
+inline typename allocator_pointer<A>::type
+allocator_allocate(A& a, typename allocator_size_type<A>::type n)
+{
+    return a.allocate(n);
+}
+
+template<class A>
+inline void
+allocator_deallocate(A& a, typename allocator_pointer<A>::type p,
+    typename allocator_size_type<A>::type n)
+{
+    a.deallocate(p, n);
+}
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+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 a.allocate(n, h);
+}
+#else
+namespace detail {
+
+template<class>
+struct alloc_no {
+    char x, y;
+};
+
+template<class A>
+class alloc_has_allocate {
+    template<class O>
+    static auto check(int)
+    -> alloc_no<decltype(std::declval<O&>().allocate(std::declval<typename
+        boost::allocator_size_type<A>::type>(), std::declval<typename
+            boost::allocator_const_void_pointer<A>::type>()))>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+
+} /* detail */
+
+template<class A>
+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)
+{
+    return a.allocate(n, h);
+}
+
+template<class A>
+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)
+{
+    return a.allocate(n);
+}
+#endif
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A, class = void>
+struct alloc_has_construct {
+    BOOST_STATIC_CONSTEXPR bool value = false;
+};
+
+template<class A>
+struct alloc_has_construct<A,
+    typename alloc_void<typename A::_default_construct_destroy>::type> {
+    BOOST_STATIC_CONSTEXPR bool value = true;
+};
+#else
+template<class A, class T, class... Args>
+class alloc_has_construct {
+    template<class O>
+    static auto check(int)
+    -> alloc_no<decltype(std::declval<O&>().construct(std::declval<T*>(),
+        std::declval<Args&&>()...))>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#endif
+
+template<bool, class = void>
+struct alloc_if { };
+
+template<class T>
+struct alloc_if<true, T> {
+    typedef T type;
+};
+
+} /* detail */
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A, class T>
+inline typename detail::alloc_if<detail::alloc_has_construct<A>::value>::type
+allocator_construct(A& a, T* p)
+{
+    a.construct(p);
+}
+
+template<class A, class T>
+inline typename detail::alloc_if<!detail::alloc_has_construct<A>::value>::type
+allocator_construct(A&, T* p)
+{
+    ::new((void*)p) T();
+}
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+template<class A, class T, class V, class... Args>
+inline void
+allocator_construct(A&, T* p, V&& v, Args&&... args)
+{
+    ::new((void*)p) T(std::forward<V>(v), std::forward<Args>(args)...);
+}
+#else
+template<class A, class T, class V>
+inline void
+allocator_construct(A&, T* p, V&& v)
+{
+    ::new((void*)p) T(std::forward<V>(v));
+}
+#endif
+#else
+template<class A, class T, class V>
+inline void
+allocator_construct(A&, T* p, const V& v)
+{
+    ::new((void*)p) T(v);
+}
+
+template<class A, class T, class V>
+inline void
+allocator_construct(A&, T* p, V& v)
+{
+    ::new((void*)p) T(v);
+}
+#endif
+#else
+template<class A, class T, class... Args>
+inline typename std::enable_if<detail::alloc_has_construct<A, T,
+    Args...>::value>::type
+allocator_construct(A& a, T* p, Args&&... args)
+{
+    a.construct(p, std::forward<Args>(args)...);
+}
+
+template<class A, class T, class... Args>
+inline typename std::enable_if<!detail::alloc_has_construct<A, T,
+    Args...>::value>::type
+allocator_construct(A&, T* p, Args&&... args)
+{
+    ::new((void*)p) T(std::forward<Args>(args)...);
+}
+#endif
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A, 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<typename A::_default_construct_destroy>::type> {
+    BOOST_STATIC_CONSTEXPR bool value = true;
+};
+#else
+template<class A, class T>
+class alloc_has_destroy {
+    template<class O>
+    static auto check(int)
+    -> alloc_no<decltype(std::declval<O&>().destroy(std::declval<T*>()))>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#endif
+
+} /* detail */
+
+template<class A, class T>
+inline typename detail::alloc_if<detail::alloc_has_destroy<A, T>::value>::type
+allocator_destroy(A& a, T* p)
+{
+    a.destroy(p);
+}
+
+template<class A, class T>
+inline typename detail::alloc_if<!detail::alloc_has_destroy<A, T>::value>::type
+allocator_destroy(A&, T* p)
+{
+    p->~T();
+    (void)p;
+}
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T, T>
+struct alloc_no {
+    char x, y;
+};
+
+template<class A>
+class alloc_has_max_size {
+    template<class O>
+    static alloc_no<typename boost::allocator_size_type<O>::type(O::*)(),
+        &O::max_size> check(int);
+
+    template<class O>
+    static alloc_no<typename boost::allocator_size_type<O>::type(O::*)() const,
+        &O::max_size> check(int);
+
+    template<class O>
+    static alloc_no<typename boost::allocator_size_type<O>::type(*)(),
+        &O::max_size> check(int);
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#else
+template<class A>
+class alloc_has_max_size {
+    template<class O>
+    static auto check(int)
+    -> alloc_no<decltype(std::declval<const O&>().max_size())>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#endif
+
+} /* detail */
+
+template<class A>
+inline typename detail::alloc_if<detail::alloc_has_max_size<A>::value,
+    typename allocator_size_type<A>::type>::type
+allocator_max_size(const A& a) BOOST_NOEXCEPT
+{
+    return a.max_size();
+}
+
+template<class A>
+inline typename detail::alloc_if<!detail::alloc_has_max_size<A>::value,
+    typename allocator_size_type<A>::type>::type
+allocator_max_size(const A&) BOOST_NOEXCEPT
+{
+    return (std::numeric_limits<typename
+        allocator_size_type<A>::type>::max)() /
+            sizeof(typename allocator_value_type<A>::type);
+}
+
+namespace detail {
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class A>
+class alloc_has_soccc {
+    template<class O>
+    static alloc_no<O(O::*)(), &O::select_on_container_copy_construction>
+    check(int);
+
+    template<class O>
+    static alloc_no<O(O::*)() const, &O::select_on_container_copy_construction>
+    check(int);
+
+    template<class O>
+    static alloc_no<O(*)(), &O::select_on_container_copy_construction>
+    check(int);
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#else
+template<class A>
+class alloc_has_soccc {
+    template<class O>
+    static auto check(int) -> alloc_no<decltype(std::declval<const
+        O&>().select_on_container_copy_construction())>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
+};
+#endif
+
+} /* detail */
+
+template<class A>
+inline typename detail::alloc_if<detail::alloc_has_soccc<A>::value, A>::type
+allocator_select_on_container_copy_construction(const A& a)
+{
+    return a.select_on_container_copy_construction();
+}
+
+template<class A>
+inline typename detail::alloc_if<!detail::alloc_has_soccc<A>::value, A>::type
+allocator_select_on_container_copy_construction(const A& a)
+{
+    return a;
+}
+
+template<class A, class T>
+inline void
+allocator_destroy_n(A& a, T* p, std::size_t n)
+{
+    while (n > 0) {
+        boost::allocator_destroy(a, p + --n);
+    }
+}
+
+namespace detail {
+
+template<class A, class T>
+class alloc_destroyer {
+public:
+    alloc_destroyer(A& a, T* p) BOOST_NOEXCEPT
+        : a_(a), p_(p), n_(0) { }
+
+    ~alloc_destroyer() {
+        boost::allocator_destroy_n(a_, p_, n_);
+    }
+
+    std::size_t& size() BOOST_NOEXCEPT {
+        return n_;
+    }
+
+private:
+    alloc_destroyer(const alloc_destroyer&);
+    alloc_destroyer& operator=(const alloc_destroyer&);
+
+    A& a_;
+    T* p_;
+    std::size_t n_;
+};
+
+} /* detail */
+
+template<class A, class T>
+inline void
+allocator_construct_n(A& a, T* p, std::size_t n)
+{
+    detail::alloc_destroyer<A, T> d(a, p);
+    for (std::size_t& i = d.size(); i < n; ++i) {
+        boost::allocator_construct(a, p + i);
+    }
+    d.size() = 0;
+}
+
+template<class A, class T>
+inline void
+allocator_construct_n(A& a, T* p, std::size_t n, const T* l, std::size_t m)
+{
+    detail::alloc_destroyer<A, T> d(a, p);
+    for (std::size_t& i = d.size(); i < n; ++i) {
+        boost::allocator_construct(a, p + i, l[i % m]);
+    }
+    d.size() = 0;
+}
+
+template<class A, class T, class I>
+inline void
+allocator_construct_n(A& a, T* p, std::size_t n, I b)
+{
+    detail::alloc_destroyer<A, T> d(a, p);
+    for (std::size_t& i = d.size(); i < n; void(++i), void(++b)) {
+        boost::allocator_construct(a, p + i, *b);
+    }
+    d.size() = 0;
+}
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+template<class A>
+using allocator_value_type_t = typename allocator_value_type<A>::type;
+
+template<class A>
+using allocator_pointer_t = typename allocator_pointer<A>::type;
+
+template<class A>
+using allocator_const_pointer_t = typename allocator_const_pointer<A>::type;
+
+template<class A>
+using allocator_void_pointer_t = typename allocator_void_pointer<A>::type;
+
+template<class A>
+using allocator_const_void_pointer_t =
+    typename allocator_const_void_pointer<A>::type;
+
+template<class A>
+using allocator_difference_type_t =
+    typename allocator_difference_type<A>::type;
+
+template<class A>
+using allocator_size_type_t = typename allocator_size_type<A>::type;
+
+template<class A>
+using allocator_propagate_on_container_copy_assignment_t =
+    typename allocator_propagate_on_container_copy_assignment<A>::type;
+
+template<class A>
+using allocator_propagate_on_container_move_assignment_t =
+    typename allocator_propagate_on_container_move_assignment<A>::type;
+
+template<class A>
+using allocator_propagate_on_container_swap_t =
+    typename allocator_propagate_on_container_swap<A>::type;
+
+template<class A>
+using allocator_is_always_equal_t =
+    typename allocator_is_always_equal<A>::type;
+
+template<class A, class T>
+using allocator_rebind_t = typename allocator_rebind<A, T>::type;
+#endif
+
+} /* 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/allocator_traits.hpp

@@ -0,0 +1,112 @@
+/*
+Copyright 2021 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_ALLOCATOR_TRAITS_HPP
+#define BOOST_CORE_ALLOCATOR_TRAITS_HPP
+
+#include <boost/core/allocator_access.hpp>
+
+namespace boost {
+
+template<class A>
+struct allocator_traits {
+    typedef A allocator_type;
+
+    typedef typename allocator_value_type<A>::type value_type;
+
+    typedef typename allocator_pointer<A>::type pointer;
+
+    typedef typename allocator_const_pointer<A>::type const_pointer;
+
+    typedef typename allocator_void_pointer<A>::type void_pointer;
+
+    typedef typename allocator_const_void_pointer<A>::type const_void_pointer;
+
+    typedef typename allocator_difference_type<A>::type difference_type;
+
+    typedef typename allocator_size_type<A>::type size_type;
+
+    typedef typename allocator_propagate_on_container_copy_assignment<A>::type
+        propagate_on_container_copy_assignment;
+
+    typedef typename allocator_propagate_on_container_move_assignment<A>::type
+        propagate_on_container_move_assignment;
+
+    typedef typename allocator_propagate_on_container_swap<A>::type
+        propagate_on_container_swap;
+
+    typedef typename allocator_is_always_equal<A>::type is_always_equal;
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+    template<class T>
+    using rebind_traits = allocator_traits<typename
+        allocator_rebind<A, T>::type>;
+#else
+    template<class T>
+    struct rebind_traits
+        : allocator_traits<typename allocator_rebind<A, T>::type> { };
+#endif
+
+    static pointer allocate(A& a, size_type n) {
+        return boost::allocator_allocate(a, n);
+    }
+
+    static pointer allocate(A& a, size_type n, const_void_pointer h) {
+        return boost::allocator_allocate(a, n, h);
+    }
+
+    static void deallocate(A& a, pointer p, size_type n) {
+        return boost::allocator_deallocate(a, p, n);
+    }
+
+    template<class T>
+    static void construct(A& a, T* p) {
+        boost::allocator_construct(a, p);
+    }
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    template<class T, class V, class... Args>
+    static void construct(A& a, T* p, V&& v, Args&&... args) {
+        boost::allocator_construct(a, p, std::forward<V>(v),
+            std::forward<Args>(args)...);
+    }
+#else
+    template<class T, class V>
+    static void construct(A& a, T* p, V&& v) {
+        boost::allocator_construct(a, p, std::forward<V>(v));
+    }
+#endif
+#else
+    template<class T, class V>
+    static void construct(A& a, T* p, const V& v) {
+        boost::allocator_construct(a, p, v);
+    }
+
+    template<class T, class V>
+    static void construct(A& a, T* p, V& v) {
+        boost::allocator_construct(a, p, v);
+    }
+#endif
+
+    template<class T>
+    static void destroy(A& a, T* p) {
+        boost::allocator_destroy(a, p);
+    }
+
+    static size_type max_size(const A& a) BOOST_NOEXCEPT {
+        return boost::allocator_max_size(a);
+    }
+
+    static A select_on_container_copy_construction(const A& a) {
+        return boost::allocator_select_on_container_copy_construction(a);
+    }
+};
+
+} /* boost */
+
+#endif

include/boost/core/bit.hpp

@@ -0,0 +1,595 @@
+#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
+
+# pragma warning(push)
+# pragma warning(disable: 4127) // conditional expression is constant
+# pragma warning(disable: 4244) // conversion from int to T
+
+#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( boost::ulong_long_type x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_clzll( x ): std::numeric_limits<boost::ulong_long_type>::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) );
+
+    BOOST_IF_CONSTEXPR ( sizeof(T) == sizeof(boost::uint8_t) )
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint8_t>( x ) );
+    }
+    else BOOST_IF_CONSTEXPR ( sizeof(T) == sizeof(boost::uint16_t) )
+    {
+        return boost::core::detail::countl_impl( static_cast<boost::uint16_t>( x ) );
+    }
+    else BOOST_IF_CONSTEXPR ( 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( boost::ulong_long_type x ) BOOST_NOEXCEPT
+{
+    return x? __builtin_ctzll( x ): std::numeric_limits<boost::ulong_long_type>::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) );
+
+    BOOST_IF_CONSTEXPR ( sizeof(T) == sizeof(boost::uint8_t) )
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint8_t>( x ) );
+    }
+    else BOOST_IF_CONSTEXPR ( sizeof(T) == sizeof(boost::uint16_t) )
+    {
+        return boost::core::detail::countr_impl( static_cast<boost::uint16_t>( x ) );
+    }
+    else BOOST_IF_CONSTEXPR ( 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( boost::ulong_long_type 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) );
+
+    BOOST_IF_CONSTEXPR ( 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;
+}
+
+// bit_width should return int, https://cplusplus.github.io/LWG/issue3656
+
+template<class T>
+BOOST_CONSTEXPR T bit_width( T x ) BOOST_NOEXCEPT
+{
+    return static_cast<T>(
+        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) );
+
+    BOOST_IF_CONSTEXPR ( 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
+
+#if defined(_MSC_VER)
+# pragma warning(pop)
+#endif
+
+#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/default_allocator.hpp

@@ -0,0 +1,158 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_DEFAULT_ALLOCATOR_HPP
+#define BOOST_CORE_DEFAULT_ALLOCATOR_HPP
+
+#include <boost/config.hpp>
+#include <new>
+
+namespace boost {
+
+#if defined(BOOST_NO_EXCEPTIONS)
+BOOST_NORETURN void throw_exception(const std::exception&);
+#endif
+
+namespace default_ {
+
+template<bool V>
+struct bool_constant {
+    typedef bool value_type;
+    typedef bool_constant type;
+
+    static const bool value = V;
+
+    operator bool() const BOOST_NOEXCEPT {
+        return V;
+    }
+
+    bool operator()() const BOOST_NOEXCEPT {
+        return V;
+    }
+};
+
+template<bool V>
+const bool bool_constant<V>::value;
+
+template<class T>
+struct add_reference {
+    typedef T& type;
+};
+
+template<>
+struct add_reference<void> {
+    typedef void type;
+};
+
+template<>
+struct add_reference<const void> {
+    typedef const void type;
+};
+
+template<class T>
+struct default_allocator {
+    typedef T value_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef typename add_reference<T>::type reference;
+    typedef typename add_reference<const T>::type const_reference;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef bool_constant<true> propagate_on_container_move_assignment;
+    typedef bool_constant<true> is_always_equal;
+
+    template<class U>
+    struct rebind {
+        typedef default_allocator<U> other;
+    };
+
+#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
+    default_allocator() = default;
+#else
+    BOOST_CONSTEXPR default_allocator() BOOST_NOEXCEPT { }
+#endif
+
+    template<class U>
+    BOOST_CONSTEXPR default_allocator(const default_allocator<U>&)
+        BOOST_NOEXCEPT { }
+
+    BOOST_CONSTEXPR std::size_t max_size() const BOOST_NOEXCEPT {
+        return static_cast<std::size_t>(-1) / (2 < sizeof(T) ? sizeof(T) : 2);
+    }
+
+#if !defined(BOOST_NO_EXCEPTIONS)
+    T* allocate(std::size_t n) {
+        if (n > max_size()) {
+            throw std::bad_alloc();
+        }
+        return static_cast<T*>(::operator new(sizeof(T) * n));
+    }
+
+    void deallocate(T* p, std::size_t) {
+        ::operator delete(p);
+    }
+#else
+    T* allocate(std::size_t n) {
+        if (n > max_size()) {
+            boost::throw_exception(std::bad_alloc());
+        }
+        void* p = ::operator new(sizeof(T) * n, std::nothrow);
+        if (!p) {
+            boost::throw_exception(std::bad_alloc());
+        }
+        return static_cast<T*>(p);
+    }
+
+    void deallocate(T* p, std::size_t) {
+        ::operator delete(p, std::nothrow);
+    }
+#endif
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+    T* allocate(std::size_t n, const void*) {
+        return allocate(n);
+    }
+#endif
+
+#if (defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION < 60000) || \
+    defined(BOOST_NO_CXX11_ALLOCATOR)
+    template<class U, class V>
+    void construct(U* p, const V& v) {
+        ::new(p) U(v);
+    }
+
+    template<class U>
+    void destroy(U* p) {
+        p->~U();
+        (void)p;
+    }
+#endif
+};
+
+template<class T, class U>
+BOOST_CONSTEXPR inline bool
+operator==(const default_allocator<T>&,
+    const default_allocator<U>&) BOOST_NOEXCEPT
+{
+    return true;
+}
+
+template<class T, class U>
+BOOST_CONSTEXPR inline bool
+operator!=(const default_allocator<T>&,
+    const default_allocator<U>&) BOOST_NOEXCEPT
+{
+    return false;
+}
+
+} /* default_ */
+
+using default_::default_allocator;
+
+} /* boost */
+
+#endif

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_ += ( boost::uint64_t(0x9e3779b9u) << 32 ) + 0x7f4a7c15u;
+
+        boost::uint64_t z = x_;
+
+        z ^= z >> 30;
+        z *= ( boost::uint64_t(0xbf58476du) << 32 ) + 0x1ce4e5b9u;
+        z ^= z >> 27;
+        z *= ( boost::uint64_t(0x94d049bbu) << 32 ) + 0x133111ebu;
+        z ^= z >> 31;
+
+        return z;
+    }
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_CORE_DETAIL_SPLITMIX64_HPP_INCLUDED

include/boost/core/empty_value.hpp

@@ -25,6 +25,11 @@ Distributed under the Boost Software License, Version 1.0.
 #endif
 #endif
 
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable:4510)
+#endif
+
 namespace boost {
 
 template<class T>
@@ -59,9 +64,9 @@ public:
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
-    template<class... Args>
-    explicit empty_value(boost::empty_init_t, Args&&... args)
-        : value_(std::forward<Args>(args)...) { }
+    template<class U, class... Args>
+    empty_value(boost::empty_init_t, U&& value, Args&&... args)
+        : value_(std::forward<U>(value), std::forward<Args>(args)...) { }
 #else
     template<class U>
     empty_value(boost::empty_init_t, U&& value)
@@ -71,6 +76,10 @@ public:
     template<class U>
     empty_value(boost::empty_init_t, const U& value)
         : value_(value) { }
+
+    template<class U>
+    empty_value(boost::empty_init_t, U& value)
+        : value_(value) { }
 #endif
 
     const T& get() const BOOST_NOEXCEPT {
@@ -103,9 +112,9 @@ public:
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
-    template<class... Args>
-    explicit empty_value(boost::empty_init_t, Args&&... args)
-        : T(std::forward<Args>(args)...) { }
+    template<class U, class... Args>
+    empty_value(boost::empty_init_t, U&& value, Args&&... args)
+        : T(std::forward<U>(value), std::forward<Args>(args)...) { }
 #else
     template<class U>
     empty_value(boost::empty_init_t, U&& value)
@@ -115,6 +124,10 @@ public:
     template<class U>
     empty_value(boost::empty_init_t, const U& value)
         : T(value) { }
+
+    template<class U>
+    empty_value(boost::empty_init_t, U& value)
+        : T(value) { }
 #endif
 
     const T& get() const BOOST_NOEXCEPT {
@@ -131,6 +144,12 @@ public:
 
 using empty_::empty_value;
 
+BOOST_INLINE_CONSTEXPR empty_init_t empty_init = empty_init_t();
+
 } /* boost */
 
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
 #endif

include/boost/core/first_scalar.hpp

@@ -0,0 +1,45 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_FIRST_SCALAR_HPP
+#define BOOST_CORE_FIRST_SCALAR_HPP
+
+#include <boost/config.hpp>
+#include <cstddef>
+
+namespace boost {
+namespace detail {
+
+template<class T>
+struct make_scalar {
+    typedef T type;
+};
+
+template<class T, std::size_t N>
+struct make_scalar<T[N]> {
+    typedef typename make_scalar<T>::type type;
+};
+
+} /* detail */
+
+template<class T>
+BOOST_CONSTEXPR inline T*
+first_scalar(T* p) BOOST_NOEXCEPT
+{
+    return p;
+}
+
+template<class T, std::size_t N>
+BOOST_CONSTEXPR inline typename detail::make_scalar<T>::type*
+first_scalar(T (*p)[N]) BOOST_NOEXCEPT
+{
+    return boost::first_scalar(&(*p)[0]);
+}
+
+} /* boost */
+
+#endif

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

@@ -22,13 +22,21 @@
 //  http://www.boost.org/LICENSE_1_0.txt
 //
 
-#include <boost/core/no_exceptions_support.hpp>
 #include <boost/current_function.hpp>
+#include <boost/config.hpp>
+#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>
+#endif
 
 //  IDE's like Visual Studio perform better if output goes to std::cout or
 //  some other stream, so allow user to configure output stream:
@@ -48,7 +56,13 @@ public:
         : report_(false)
         , errors_(0) {
 #if defined(_MSC_VER) && (_MSC_VER > 1310)
+        // disable message boxes on assert(), abort()
         ::_set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
+#endif
+#if defined(_MSC_VER) && defined(_CPPLIB_VER) && defined(_DEBUG)
+        // disable message boxes on iterator debugging violations
+        _CrtSetReportMode( _CRT_ASSERT, _CRTDBG_MODE_FILE );
+        _CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDERR );
 #endif
     }
 
@@ -83,12 +97,21 @@ inline int& test_errors()
     return test_results().errors();
 }
 
-inline void test_failed_impl(char const * expr, char const * file, int line, char const * function)
+inline bool test_impl(char const * expr, char const * file, int line, char const * function, bool v)
 {
-    BOOST_LIGHTWEIGHT_TEST_OSTREAM
-      << file << "(" << line << "): test '" << expr << "' failed in function '"
-      << function << "'" << std::endl;
-    ++test_results().errors();
+    if( v )
+    {
+        test_results();
+        return true;
+    }
+    else
+    {
+        BOOST_LIGHTWEIGHT_TEST_OSTREAM
+          << file << "(" << line << "): test '" << expr << "' failed in function '"
+          << function << "'" << std::endl;
+        ++test_results().errors();
+        return false;
+    }
 }
 
 inline void error_impl(char const * msg, char const * file, int line, char const * function)
@@ -99,25 +122,41 @@ inline void error_impl(char const * msg, char const * file, int line, char const
     ++test_results().errors();
 }
 
-inline void throw_failed_impl(char const * excep, char const * file, int line, char const * function)
+inline void throw_failed_impl(const char* expr, char const * excep, char const * file, int line, char const * function)
 {
    BOOST_LIGHTWEIGHT_TEST_OSTREAM
-    << file << "(" << line << "): Exception '" << excep << "' not thrown in function '"
+    << file << "(" << line << "): expression '" << expr << "' did not throw exception '" << excep << "' in function '"
     << function << "'" << std::endl;
    ++test_results().errors();
 }
 
+inline void no_throw_failed_impl(const char* expr, const char* file, int line, const char* function)
+{
+    BOOST_LIGHTWEIGHT_TEST_OSTREAM
+        << file << "(" << line << "): expression '" << expr << "' threw an exception in function '"
+        << function << "'" << std::endl;
+   ++test_results().errors();
+}
+
+inline void no_throw_failed_impl(const char* expr, const char* what, const char* file, int line, const char* function)
+{
+    BOOST_LIGHTWEIGHT_TEST_OSTREAM
+        << file << "(" << line << "): expression '" << expr << "' threw an exception in function '"
+        << function << "': " << what << std::endl;
+   ++test_results().errors();
+}
+
 // In the comparisons below, it is possible that T and U are signed and unsigned integer types, which generates warnings in some compilers.
 // A cleaner fix would require common_type trait or some meta-programming, which would introduce a dependency on Boost.TypeTraits. To avoid
 // the dependency we just disable the warnings.
-#if defined(_MSC_VER)
-# pragma warning(push)
-# pragma warning(disable: 4389)
-#elif defined(__clang__) && defined(__has_warning)
+#if defined(__clang__) && defined(__has_warning)
 # if __has_warning("-Wsign-compare")
 #  pragma clang diagnostic push
 #  pragma clang diagnostic ignored "-Wsign-compare"
 # endif
+#elif defined(_MSC_VER)
+# pragma warning(push)
+# pragma warning(disable: 4389)
 #elif defined(__GNUC__) && !(defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 406
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wsign-compare"
@@ -137,67 +176,156 @@ 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
 
-struct lw_test_eq {
+// 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
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t == u; }
-    static const char* op() { return "=="; }
 };
 
-struct lw_test_ne {
+struct lw_test_ne
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t != u; }
-    static const char* op() { return "!="; }
 };
 
-struct lw_test_lt {
+struct lw_test_lt
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t < u; }
-    static const char* op() { return "<"; }
 };
 
-struct lw_test_le {
+struct lw_test_le
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t <= u; }
-    static const char* op() { return "<="; }
 };
 
-struct lw_test_gt {
+struct lw_test_gt
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t > u; }
-    static const char* op() { return ">"; }
 };
 
-struct lw_test_ge {
+struct lw_test_ge
+{
     template <typename T, typename U>
     bool operator()(const T& t, const U& u) const { return t >= u; }
-    static const char* op() { return ">="; }
 };
 
+// lwt_predicate_name
+
+template<class T> char const * lwt_predicate_name( T const& )
+{
+    return "~=";
+}
+
+inline char const * lwt_predicate_name( lw_test_eq const& )
+{
+    return "==";
+}
+
+inline char const * lwt_predicate_name( lw_test_ne const& )
+{
+    return "!=";
+}
+
+inline char const * lwt_predicate_name( lw_test_lt const& )
+{
+    return "<";
+}
+
+inline char const * lwt_predicate_name( lw_test_le const& )
+{
+    return "<=";
+}
+
+inline char const * lwt_predicate_name( lw_test_gt const& )
+{
+    return ">";
+}
+
+inline char const * lwt_predicate_name( lw_test_ge const& )
+{
+    return ">=";
+}
+
+//
+
 template<class BinaryPredicate, class T, class U>
-inline void test_with_impl(BinaryPredicate pred, char const * expr1, char const * expr2,
+inline bool test_with_impl(BinaryPredicate pred, char const * expr1, char const * expr2,
                            char const * file, int line, char const * function,
                            T const & t, U const & u)
 {
     if( pred(t, u) )
     {
         test_results();
+        return true;
     }
     else
     {
         BOOST_LIGHTWEIGHT_TEST_OSTREAM
-            << file << "(" << line << "): test '" << expr1 << " " << pred.op() << " " << expr2
-            << "' ('" << test_output_impl(t) << "' " << pred.op() << " '" << test_output_impl(u)
+            << file << "(" << line << "): test '" << expr1 << " " << lwt_predicate_name(pred) << " " << expr2
+            << "' ('" << test_output_impl(t) << "' " << lwt_predicate_name(pred) << " '" << test_output_impl(u)
             << "') failed in function '" << function << "'" << std::endl;
         ++test_results().errors();
+        return false;
     }
 }
 
-inline void test_cstr_eq_impl( char const * expr1, char const * expr2,
+inline bool test_cstr_eq_impl( char const * expr1, char const * expr2,
   char const * file, int line, char const * function, char const * const t, char const * const u )
 {
     if( std::strcmp(t, u) == 0 )
     {
         test_results();
+        return true;
     }
     else
     {
@@ -205,15 +333,17 @@ inline void test_cstr_eq_impl( char const * expr1, char const * expr2,
             << file << "(" << line << "): test '" << expr1 << " == " << expr2 << "' ('" << t
             << "' == '" << u << "') failed in function '" << function << "'" << std::endl;
         ++test_results().errors();
+        return false;
     }
 }
 
-inline void test_cstr_ne_impl( char const * expr1, char const * expr2,
+inline bool test_cstr_ne_impl( char const * expr1, char const * expr2,
   char const * file, int line, char const * function, char const * const t, char const * const u )
 {
     if( std::strcmp(t, u) != 0 )
     {
         test_results();
+        return true;
     }
     else
     {
@@ -221,11 +351,12 @@ inline void test_cstr_ne_impl( char const * expr1, char const * expr2,
             << file << "(" << line << "): test '" << expr1 << " != " << expr2 << "' ('" << t
             << "' != '" << u << "') failed in function '" << function << "'" << std::endl;
         ++test_results().errors();
+        return false;
     }
 }
 
 template<class FormattedOutputFunction, class InputIterator1, class InputIterator2>
-void test_all_eq_impl(FormattedOutputFunction& output,
+bool test_all_eq_impl(FormattedOutputFunction& output,
                       char const * file, int line, char const * function,
                       InputIterator1 first_begin, InputIterator1 first_end,
                       InputIterator2 second_begin, InputIterator2 second_end)
@@ -284,16 +415,18 @@ void test_all_eq_impl(FormattedOutputFunction& output,
     if (error_count == 0)
     {
         test_results();
+        return true;
     }
     else
     {
         output << std::endl;
         ++test_results().errors();
+        return false;
     }
 }
 
 template<class FormattedOutputFunction, class InputIterator1, class InputIterator2, typename BinaryPredicate>
-void test_all_with_impl(FormattedOutputFunction& output,
+bool test_all_with_impl(FormattedOutputFunction& output,
                         char const * file, int line, char const * function,
                         InputIterator1 first_begin, InputIterator1 first_end,
                         InputIterator2 second_begin, InputIterator2 second_end,
@@ -353,20 +486,22 @@ void test_all_with_impl(FormattedOutputFunction& output,
     if (error_count == 0)
     {
         test_results();
+        return true;
     }
     else
     {
         output << std::endl;
         ++test_results().errors();
+        return false;
     }
 }
 
-#if defined(_MSC_VER)
-# pragma warning(pop)
-#elif defined(__clang__) && defined(__has_warning)
+#if defined(__clang__) && defined(__has_warning)
 # if __has_warning("-Wsign-compare")
 #  pragma clang diagnostic pop
 # endif
+#elif defined(_MSC_VER)
+# pragma warning(pop)
 #elif defined(__GNUC__) && !(defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 406
 # pragma GCC diagnostic pop
 #endif
@@ -379,27 +514,31 @@ inline int report_errors()
     result.done();
 
     int errors = result.errors();
+
     if( errors == 0 )
     {
         BOOST_LIGHTWEIGHT_TEST_OSTREAM
           << "No errors detected." << std::endl;
-        return 0;
     }
     else
     {
         BOOST_LIGHTWEIGHT_TEST_OSTREAM
           << errors << " error" << (errors == 1? "": "s") << " detected." << std::endl;
-        return 1;
     }
+
+    // `return report_errors();` from main only supports 8 bit exit codes
+    return errors < 256? errors: 255;
 }
 
 } // namespace boost
 
-#define BOOST_TEST(expr) ((expr)? (void)::boost::detail::test_results(): ::boost::detail::test_failed_impl(#expr, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION))
+#define BOOST_TEST(expr) ( ::boost::detail::test_impl(#expr, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, (expr)? true: false) )
 #define BOOST_TEST_NOT(expr) BOOST_TEST(!(expr))
 
 #define BOOST_ERROR(msg) ( ::boost::detail::error_impl(msg, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION) )
 
+#define BOOST_TEST_WITH(expr1,expr2,predicate) ( ::boost::detail::test_with_impl(predicate, #expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
+
 #define BOOST_TEST_EQ(expr1,expr2) ( ::boost::detail::test_with_impl(::boost::detail::lw_test_eq(), #expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
 #define BOOST_TEST_NE(expr1,expr2) ( ::boost::detail::test_with_impl(::boost::detail::lw_test_ne(), #expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
 
@@ -415,22 +554,38 @@ inline int report_errors()
 #define BOOST_TEST_ALL_WITH(begin1, end1, begin2, end2, predicate) ( ::boost::detail::test_all_with_impl(BOOST_LIGHTWEIGHT_TEST_OSTREAM, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, begin1, end1, begin2, end2, predicate) )
 
 #ifndef BOOST_NO_EXCEPTIONS
-   #define BOOST_TEST_THROWS( EXPR, EXCEP )                    \
-      try {                                                    \
-         EXPR;                                                 \
-         ::boost::detail::throw_failed_impl                    \
-         (#EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
-      }                                                        \
-      catch(EXCEP const&) {                                    \
-         ::boost::detail::test_results();                      \
-      }                                                        \
-      catch(...) {                                             \
-         ::boost::detail::throw_failed_impl                    \
-         (#EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
-      }                                                        \
+   #define BOOST_TEST_THROWS( EXPR, EXCEP )                           \
+      try {                                                           \
+         EXPR;                                                        \
+         ::boost::detail::throw_failed_impl                           \
+         (#EXPR, #EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
+      }                                                               \
+      catch(EXCEP const&) {                                           \
+         ::boost::detail::test_results();                             \
+      }                                                               \
+      catch(...) {                                                    \
+         ::boost::detail::throw_failed_impl                           \
+         (#EXPR, #EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
+      }                                                               \
    //
 #else
    #define BOOST_TEST_THROWS( EXPR, EXCEP )
 #endif
 
+#ifndef BOOST_NO_EXCEPTIONS
+#  define BOOST_TEST_NO_THROW(EXPR)                                    \
+    try {                                                              \
+        EXPR;                                                          \
+    } catch (const std::exception& e) {                                \
+        ::boost::detail::no_throw_failed_impl                          \
+        (#EXPR, e.what(), __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
+    } catch (...) {                                                    \
+        ::boost::detail::no_throw_failed_impl                          \
+        (#EXPR, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION);           \
+    }
+    //
+#else
+#  define BOOST_TEST_NO_THROW(EXPR) { EXPR; }
+#endif
+
 #endif // #ifndef BOOST_CORE_LIGHTWEIGHT_TEST_HPP

include/boost/core/lightweight_test_trait.hpp

@@ -11,19 +11,22 @@
 //
 // BOOST_TEST_TRAIT_TRUE, BOOST_TEST_TRAIT_FALSE, BOOST_TEST_TRAIT_SAME
 //
-// Copyright 2014 Peter Dimov
+// Copyright 2014, 2021 Peter Dimov
+//
+// Copyright 2019 Glen Joseph Fernandes
+// (glenjofe@gmail.com)
 //
 // Distributed under the Boost Software License, Version 1.0.
 // See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/core/lightweight_test.hpp>
-#include <boost/core/typeinfo.hpp>
+#include <boost/core/type_name.hpp>
 #include <boost/core/is_same.hpp>
+#include <boost/config.hpp>
 
 namespace boost
 {
-
 namespace detail
 {
 
@@ -38,7 +41,7 @@ template< class T > inline void test_trait_impl( char const * trait, void (*)( T
     {
         BOOST_LIGHTWEIGHT_TEST_OSTREAM
             << file << "(" << line << "): predicate '" << trait << "' ["
-            << boost::core::demangled_name( BOOST_CORE_TYPEID(T) ) << "]"
+            << boost::core::type_name<T>() << "]"
             << " test failed in function '" << function
             << "' (should have been " << ( expected? "true": "false" ) << ")"
             << std::endl;
@@ -64,8 +67,8 @@ template<class T1, class T2> inline void test_trait_same_impl( char const * type
         BOOST_LIGHTWEIGHT_TEST_OSTREAM
             << file << "(" << line << "): test 'is_same<" << types << ">'"
             << " failed in function '" << function
-            << "' ('" << boost::core::demangled_name( BOOST_CORE_TYPEID(T1) )
-            << "' != '" << boost::core::demangled_name( BOOST_CORE_TYPEID(T2) ) << "')"
+            << "' ('" << boost::core::type_name<T1>()
+            << "' != '" << boost::core::type_name<T2>() << "')"
             << std::endl;
 
         ++test_results().errors();
@@ -73,11 +76,16 @@ template<class T1, class T2> inline void test_trait_same_impl( char const * type
 }
 
 } // namespace detail
-
 } // namespace boost
 
 #define BOOST_TEST_TRAIT_TRUE(type) ( ::boost::detail::test_trait_impl(#type, (void(*)type)0, true, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION) )
 #define BOOST_TEST_TRAIT_FALSE(type) ( ::boost::detail::test_trait_impl(#type, (void(*)type)0, false, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION) )
+
+#if defined(__GNUC__)
+// ignoring -Wvariadic-macros with #pragma doesn't work under GCC
+# pragma GCC system_header
+#endif
+
 #define BOOST_TEST_TRAIT_SAME(...) ( ::boost::detail::test_trait_same_impl(#__VA_ARGS__, ::boost::core::is_same<__VA_ARGS__>(), __FILE__, __LINE__, BOOST_CURRENT_FUNCTION) )
 
 #endif // #ifndef BOOST_CORE_LIGHTWEIGHT_TEST_TRAIT_HPP

include/boost/core/no_exceptions_support.hpp

@@ -29,12 +29,24 @@
 #    define BOOST_RETHROW throw;
 #    define BOOST_CATCH_END }
 #else
-#    if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+#    if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x564))
 #        define BOOST_TRY { if ("")
 #        define BOOST_CATCH(x) else if (!"")
-#    else
+#    elif !defined(BOOST_MSVC) || BOOST_MSVC >= 1900
 #        define BOOST_TRY { if (true)
 #        define BOOST_CATCH(x) else if (false)
+#    else
+         // warning C4127: conditional expression is constant
+#        define BOOST_TRY { \
+             __pragma(warning(push)) \
+             __pragma(warning(disable: 4127)) \
+             if (true) \
+             __pragma(warning(pop))
+#        define BOOST_CATCH(x) else \
+             __pragma(warning(push)) \
+             __pragma(warning(disable: 4127)) \
+             if (false) \
+             __pragma(warning(pop))
 #    endif
 #    define BOOST_RETHROW
 #    define BOOST_CATCH_END }

include/boost/core/noinit_adaptor.hpp

@@ -0,0 +1,90 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_NOINIT_ADAPTOR_HPP
+#define BOOST_CORE_NOINIT_ADAPTOR_HPP
+
+#include <boost/core/allocator_access.hpp>
+
+namespace boost {
+
+template<class A>
+struct noinit_adaptor
+    : A {
+    typedef void _default_construct_destroy;
+
+    template<class U>
+    struct rebind {
+        typedef noinit_adaptor<typename allocator_rebind<A, U>::type> other;
+    };
+
+    noinit_adaptor()
+        : A() { }
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template<class U>
+    noinit_adaptor(U&& u) BOOST_NOEXCEPT
+        : A(std::forward<U>(u)) { }
+#else
+    template<class U>
+    noinit_adaptor(const U& u) BOOST_NOEXCEPT
+        : A(u) { }
+
+    template<class U>
+    noinit_adaptor(U& u) BOOST_NOEXCEPT
+        : A(u) { }
+#endif
+
+    template<class U>
+    noinit_adaptor(const noinit_adaptor<U>& u) BOOST_NOEXCEPT
+        : A(static_cast<const A&>(u)) { }
+
+    template<class U>
+    void construct(U* p) {
+        ::new((void*)p) U;
+    }
+
+#if defined(BOOST_NO_CXX11_ALLOCATOR)
+    template<class U, class V>
+    void construct(U* p, const V& v) {
+        ::new((void*)p) U(v);
+    }
+#endif
+
+    template<class U>
+    void destroy(U* p) {
+        p->~U();
+        (void)p;
+    }
+};
+
+template<class T, class U>
+inline bool
+operator==(const noinit_adaptor<T>& lhs,
+    const noinit_adaptor<U>& rhs) BOOST_NOEXCEPT
+{
+    return static_cast<const T&>(lhs) == static_cast<const U&>(rhs);
+}
+
+template<class T, class U>
+inline bool
+operator!=(const noinit_adaptor<T>& lhs,
+    const noinit_adaptor<U>& rhs) BOOST_NOEXCEPT
+{
+    return !(lhs == rhs);
+}
+
+template<class A>
+inline noinit_adaptor<A>
+noinit_adapt(const A& a) BOOST_NOEXCEPT
+{
+    return noinit_adaptor<A>(a);
+}
+
+} /* boost */
+
+#endif

include/boost/core/noncopyable.hpp

@@ -27,7 +27,7 @@ namespace noncopyable_  // protection from unintended ADL
 // whether a type derives from noncopyable without needing the definition
 // of noncopyable itself.
 //
-// The definition of base_token is macro-guarded so that Type Trais can
+// The definition of base_token is macro-guarded so that Type Traits can
 // define it locally without including this header, to avoid a dependency
 // on Core.
 

include/boost/core/nvp.hpp

@@ -0,0 +1,57 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_NVP_HPP
+#define BOOST_CORE_NVP_HPP
+
+#include <boost/core/addressof.hpp>
+#include <boost/config.hpp>
+
+namespace boost {
+namespace serialization {
+
+template<class T>
+class nvp {
+public:
+    nvp(const char* n, T& v) BOOST_NOEXCEPT
+        : n_(n)
+        , v_(boost::addressof(v)) { }
+
+    const char* name() const BOOST_NOEXCEPT {
+        return n_;
+    }
+
+    T& value() const BOOST_NOEXCEPT {
+        return *v_;
+    }
+
+    const T& const_value() const BOOST_NOEXCEPT {
+        return *v_;
+    }
+
+private:
+    const char* n_;
+    T* v_;
+};
+
+template<class T>
+inline const nvp<T>
+make_nvp(const char* n, T& v) BOOST_NOEXCEPT
+{
+    return nvp<T>(n, v);
+}
+
+} /* serialization */
+
+using serialization::nvp;
+using serialization::make_nvp;
+
+} /* boost */
+
+#define BOOST_NVP(v) boost::make_nvp(BOOST_STRINGIZE(v), v)
+
+#endif

include/boost/core/pointer_traits.hpp

@@ -1,5 +1,5 @@
 /*
-Copyright 2017-2018 Glen Joseph Fernandes
+Copyright 2017-2021 Glen Joseph Fernandes
 (glenjofe@gmail.com)
 
 Distributed under the Boost Software License, Version 1.0.
@@ -9,42 +9,23 @@ Distributed under the Boost Software License, Version 1.0.
 #define BOOST_CORE_POINTER_TRAITS_HPP
 
 #include <boost/config.hpp>
-#if !defined(BOOST_NO_CXX11_POINTER_TRAITS)
-#include <memory>
-#else
 #include <boost/core/addressof.hpp>
-#endif
+#include <cstddef>
 
 namespace boost {
-
-#if !defined(BOOST_NO_CXX11_POINTER_TRAITS)
-template<class T>
-struct pointer_traits
-    : std::pointer_traits<T> {
-    template<class U>
-    struct rebind_to {
-        typedef typename std::pointer_traits<T>::template rebind<U> type;
-    };
-};
-
-template<class T>
-struct pointer_traits<T*>
-    : std::pointer_traits<T*> {
-    template<class U>
-    struct rebind_to {
-        typedef U* type;
-    };
-};
-#else
 namespace detail {
 
+struct ptr_none { };
+
 template<class>
-struct ptr_void {
+struct ptr_valid {
     typedef void type;
 };
 
-template<class T>
-struct ptr_first;
+template<class>
+struct ptr_first {
+    typedef ptr_none type;
+};
 
 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 template<template<class, class...> class T, class U, class... Args>
@@ -74,7 +55,7 @@ struct ptr_element {
 };
 
 template<class T>
-struct ptr_element<T, typename ptr_void<typename T::element_type>::type> {
+struct ptr_element<T, typename ptr_valid<typename T::element_type>::type> {
     typedef typename T::element_type type;
 };
 
@@ -85,12 +66,12 @@ struct ptr_difference {
 
 template<class T>
 struct ptr_difference<T,
-    typename ptr_void<typename T::difference_type>::type> {
+    typename ptr_valid<typename T::difference_type>::type> {
     typedef typename T::difference_type type;
 };
 
-template<class T, class V>
-struct ptr_transform;
+template<class, class>
+struct ptr_transform { };
 
 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 template<template<class, class...> class T, class U, class... Args, class V>
@@ -116,68 +97,131 @@ struct ptr_transform<T<U1, U2, U3>, V> {
 #endif
 
 template<class T, class U, class = void>
-struct ptr_rebind {
-    typedef typename ptr_transform<T, U>::type type;
-};
+struct ptr_rebind
+    : ptr_transform<T, U> { };
 
-#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 template<class T, class U>
 struct ptr_rebind<T, U,
-    typename ptr_void<typename T::template rebind<U> >::type> {
+    typename ptr_valid<typename T::template rebind<U> >::type> {
     typedef typename T::template rebind<U> type;
 };
+
+#if !defined(BOOST_NO_CXX11_DECLTYPE_N3276)
+template<class T, class E>
+class ptr_to_expr {
+    template<class>
+    struct result {
+        char x, y;
+    };
+
+    static E& source();
+
+    template<class O>
+    static auto check(int) -> result<decltype(O::pointer_to(source()))>;
+
+    template<class>
+    static char check(long);
+
+public:
+    BOOST_STATIC_CONSTEXPR bool value = sizeof(check<T>(0)) > 1;
+};
+
+template<class T, class E>
+struct ptr_to_expr<T*, E> {
+    BOOST_STATIC_CONSTEXPR bool value = true;
+};
+
+template<class T, class E>
+struct ptr_has_to {
+    BOOST_STATIC_CONSTEXPR bool value = ptr_to_expr<T, E>::value;
+};
+#else
+template<class, class>
+struct ptr_has_to {
+    BOOST_STATIC_CONSTEXPR bool value = true;
+};
 #endif
 
 template<class T>
-struct ptr_value {
-    typedef T type;
+struct ptr_has_to<T, void> {
+    BOOST_STATIC_CONSTEXPR bool value = false;
 };
 
-template<>
-struct ptr_value<void> {
-    typedef struct { } type;
+template<class T>
+struct ptr_has_to<T, const void> {
+    BOOST_STATIC_CONSTEXPR bool value = false;
 };
 
+template<class T>
+struct ptr_has_to<T, volatile void> {
+    BOOST_STATIC_CONSTEXPR bool value = false;
+};
+
+template<class T>
+struct ptr_has_to<T, const volatile void> {
+    BOOST_STATIC_CONSTEXPR bool value = false;
+};
+
+template<class T, class E, bool = ptr_has_to<T, E>::value>
+struct ptr_to { };
+
+template<class T, class E>
+struct ptr_to<T, E, true> {
+    static T pointer_to(E& v) {
+        return T::pointer_to(v);
+    }
+};
+
+template<class T>
+struct ptr_to<T*, T, true> {
+    static T* pointer_to(T& v) BOOST_NOEXCEPT {
+        return boost::addressof(v);
+    }
+};
+
+template<class T, class E>
+struct ptr_traits
+    : ptr_to<T, E> {
+    typedef T pointer;
+    typedef E element_type;
+    typedef typename ptr_difference<T>::type difference_type;
+
+    template<class U>
+    struct rebind_to
+        : ptr_rebind<T, U> { };
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+    template<class U>
+    using rebind = typename rebind_to<U>::type;
+#endif
+};
+
+template<class T>
+struct ptr_traits<T, ptr_none> { };
+
 } /* detail */
 
 template<class T>
-struct pointer_traits {
-    typedef T pointer;
-    typedef typename detail::ptr_element<T>::type element_type;
-    typedef typename detail::ptr_difference<T>::type difference_type;
-    template<class U>
-    struct rebind_to {
-        typedef typename detail::ptr_rebind<T, U>::type type;
-    };
-#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
-    template<class U>
-    using rebind = typename detail::ptr_rebind<T, U>::type;
-#endif
-    static pointer
-    pointer_to(typename detail::ptr_value<element_type>::type& v) {
-        return pointer::pointer_to(v);
-    }
-};
+struct pointer_traits
+    : detail::ptr_traits<T, typename detail::ptr_element<T>::type> { };
 
 template<class T>
-struct pointer_traits<T*> {
+struct pointer_traits<T*>
+    : detail::ptr_to<T*, T> {
     typedef T* pointer;
     typedef T element_type;
     typedef std::ptrdiff_t difference_type;
+
     template<class U>
     struct rebind_to {
         typedef U* type;
     };
+
 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
     template<class U>
-    using rebind = U*;
+    using rebind = typename rebind_to<U>::type;
 #endif
-    static T*
-    pointer_to(typename detail::ptr_value<T>::type& v) BOOST_NOEXCEPT {
-        return boost::addressof(v);
-    }
 };
-#endif
 
 template<class T>
 BOOST_CONSTEXPR inline T*

include/boost/core/quick_exit.hpp

@@ -16,7 +16,7 @@
 //  http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/config.hpp>
-#include <cstdlib>
+#include <stdlib.h>
 
 #if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
 
@@ -33,7 +33,7 @@ extern "C" _Noreturn void quick_exit(int);
 namespace boost
 {
 
-BOOST_NORETURN void quick_exit( int code ) BOOST_NOEXCEPT
+BOOST_NORETURN inline void quick_exit( int code ) BOOST_NOEXCEPT
 {
 #if defined(_MSC_VER) && _MSC_VER < 1900
 

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.
@@ -116,7 +152,7 @@ private:
 /**
  @cond
 */
-#if defined( __BORLANDC__ ) && BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x581) )
+#if defined( BOOST_BORLANDC ) && BOOST_WORKAROUND( BOOST_BORLANDC, BOOST_TESTED_AT(0x581) )
 #  define BOOST_REF_CONST
 #else
 #  define BOOST_REF_CONST const

include/boost/core/span.hpp

@@ -0,0 +1,399 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_SPAN_HPP
+#define BOOST_CORE_SPAN_HPP
+
+#include <array>
+#include <iterator>
+#include <type_traits>
+#include <cstddef>
+
+namespace boost {
+
+constexpr std::size_t dynamic_extent = static_cast<std::size_t>(-1);
+
+template<class T, std::size_t E = dynamic_extent>
+class span;
+
+namespace detail {
+
+template<class U, class T>
+struct span_convertible {
+    static constexpr bool value = std::is_convertible<U(*)[], T(*)[]>::value;
+};
+
+template<std::size_t E, std::size_t N>
+struct span_capacity {
+    static constexpr bool value = E == boost::dynamic_extent || E == N;
+};
+
+template<class T, std::size_t E, class U, std::size_t N>
+struct span_compatible {
+    static constexpr bool value = span_capacity<E, N>::value &&
+        span_convertible<U, T>::value;
+};
+
+template<class T>
+struct span_uncvref {
+    typedef typename std::remove_cv<typename
+        std::remove_reference<T>::type>::type type;
+};
+
+template<class>
+struct span_is_span {
+    static constexpr bool value = false;
+};
+
+template<class T, std::size_t E>
+struct span_is_span<boost::span<T, E> > {
+    static constexpr bool value = true;
+};
+
+template<class T>
+struct span_is_array {
+    static constexpr bool value = false;
+};
+
+template<class T, std::size_t N>
+struct span_is_array<std::array<T, N> > {
+    static constexpr bool value = true;
+};
+
+template<class, class = void>
+struct span_data { };
+
+template<class T>
+struct span_data<T,
+    typename std::enable_if<std::is_pointer<decltype(std::declval<T
+        &>().data())>::value>::type> {
+    typedef typename std::remove_pointer<decltype(std::declval<T
+        &>().data())>::type type;
+};
+
+template<class, class, class = void>
+struct span_has_data {
+    static constexpr bool value = false;
+};
+
+template<class R, class T>
+struct span_has_data<R, T, typename std::enable_if<span_convertible<typename
+    span_data<R>::type, T>::value>::type> {
+    static constexpr bool value = true;
+};
+
+template<class, class = void>
+struct span_has_size {
+    static constexpr bool value = false;
+};
+
+template<class R>
+struct span_has_size<R, typename
+    std::enable_if<std::is_convertible<decltype(std::declval<R&>().size()),
+        std::size_t>::value>::type> {
+    static constexpr bool value = true;
+};
+
+template<class R, class T>
+struct span_is_range {
+    static constexpr bool value = (std::is_const<T>::value ||
+        std::is_lvalue_reference<R>::value) &&
+        !span_is_span<typename span_uncvref<R>::type>::value &&
+        !span_is_array<typename span_uncvref<R>::type>::value &&
+        !std::is_array<typename span_uncvref<R>::type>::value &&
+        span_has_data<R, T>::value &&
+        span_has_size<R>::value;
+};
+
+template<std::size_t E, std::size_t N>
+struct span_implicit {
+    static constexpr bool value = E == boost::dynamic_extent ||
+        N != boost::dynamic_extent;
+};
+
+template<class T, std::size_t E, class U, std::size_t N>
+struct span_copyable {
+    static constexpr bool value = (N == boost::dynamic_extent ||
+        span_capacity<E, N>::value) && span_convertible<U, T>::value;
+};
+
+template<std::size_t E, std::size_t O>
+struct span_sub {
+    static constexpr std::size_t value = E == boost::dynamic_extent ?
+        boost::dynamic_extent : E - O;
+};
+
+template<class T, std::size_t E>
+struct span_store {
+    constexpr span_store(T* p_, std::size_t) noexcept
+        : p(p_) { }
+    static constexpr std::size_t n = E;
+    T* p;
+};
+
+template<class T>
+struct span_store<T, boost::dynamic_extent> {
+    constexpr span_store(T* p_, std::size_t n_) noexcept
+        : p(p_)
+        , n(n_) { }
+    T* p;
+    std::size_t n;
+};
+
+template<class T, std::size_t E>
+struct span_bytes {
+    static constexpr std::size_t value = sizeof(T) * E;
+};
+
+template<class T>
+struct span_bytes<T, boost::dynamic_extent> {
+    static constexpr std::size_t value = boost::dynamic_extent;
+};
+
+} /* detail */
+
+template<class T, std::size_t E>
+class span {
+public:
+    typedef T element_type;
+    typedef typename std::remove_cv<T>::type value_type;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef T& reference;
+    typedef const T& const_reference;
+    typedef T* iterator;
+    typedef const T* const_iterator;
+    typedef std::reverse_iterator<T*> reverse_iterator;
+    typedef std::reverse_iterator<const T*> const_reverse_iterator;
+
+    static constexpr std::size_t extent = E;
+
+    template<std::size_t N = E,
+        typename std::enable_if<N == dynamic_extent || N == 0, int>::type = 0>
+    constexpr span() noexcept
+        : s_(0, 0) { }
+
+    template<class I,
+        typename std::enable_if<E == dynamic_extent &&
+            detail::span_convertible<I, T>::value, int>::type = 0>
+    constexpr span(I* f, size_type c)
+        : s_(f, c) { }
+
+    template<class I,
+        typename std::enable_if<E != dynamic_extent &&
+            detail::span_convertible<I, T>::value, int>::type = 0>
+    explicit constexpr span(I* f, size_type c)
+        : s_(f, c) { }
+
+    template<class I, class L,
+        typename std::enable_if<E == dynamic_extent &&
+            detail::span_convertible<I, T>::value, int>::type = 0>
+    constexpr span(I* f, L* l)
+        : s_(f, l - f) { }
+
+    template<class I, class L,
+        typename std::enable_if<E != dynamic_extent &&
+            detail::span_convertible<I, T>::value, int>::type = 0>
+    explicit constexpr span(I* f, L* l)
+        : s_(f, l - f) { }
+
+    template<std::size_t N,
+        typename std::enable_if<detail::span_capacity<E, N>::value,
+            int>::type = 0>
+    constexpr span(typename std::enable_if<true, T>::type (&a)[N]) noexcept
+        : s_(a, N) { }
+
+    template<class U, std::size_t N,
+        typename std::enable_if<detail::span_compatible<T, E, U, N>::value,
+            int>::type = 0>
+    constexpr span(std::array<U, N>& a) noexcept
+        : s_(a.data(), N) { }
+
+    template<class U, std::size_t N,
+        typename std::enable_if<detail::span_compatible<T, E, const U,
+            N>::value, int>::type = 0>
+    constexpr span(const std::array<U, N>& a) noexcept
+        : s_(a.data(), N) { }
+
+    template<class R,
+        typename std::enable_if<E == dynamic_extent &&
+            detail::span_is_range<R, T>::value, int>::type = 0>
+    constexpr span(R&& r) noexcept(noexcept(r.data()) && noexcept(r.size()))
+        : s_(r.data(), r.size()) { }
+
+    template<class R,
+        typename std::enable_if<E != dynamic_extent &&
+            detail::span_is_range<R, T>::value, int>::type = 0>
+    explicit constexpr span(R&& r) noexcept(noexcept(r.data()) &&
+        noexcept(r.size()))
+        : s_(r.data(), r.size()) { }
+
+    template<class U, std::size_t N,
+        typename std::enable_if<detail::span_implicit<E, N>::value &&
+            detail::span_copyable<T, E, U, N>::value, int>::type = 0>
+    constexpr span(const span<U, N>& s) noexcept
+        : s_(s.data(), s.size()) { }
+
+    template<class U, std::size_t N,
+        typename std::enable_if<!detail::span_implicit<E, N>::value &&
+            detail::span_copyable<T, E, U, N>::value, int>::type = 0>
+    explicit constexpr span(const span<U, N>& s) noexcept
+        : s_(s.data(), s.size()) { }
+
+    template<std::size_t C>
+    constexpr span<T, C> first() const {
+        static_assert(C <= E, "Count <= Extent");
+        return span<T, C>(s_.p, C);
+    }
+
+    template<std::size_t C>
+    constexpr span<T, C> last() const {
+        static_assert(C <= E, "Count <= Extent");
+        return span<T, C>(s_.p + (s_.n - C), C);
+    }
+
+    template<std::size_t O, std::size_t C = dynamic_extent>
+    constexpr typename std::enable_if<C == dynamic_extent,
+        span<T, detail::span_sub<E, O>::value> >::type subspan() const {
+        static_assert(O <= E, "Offset <= Extent");
+        return span<T, detail::span_sub<E, O>::value>(s_.p + O, s_.n - O);
+    }
+
+    template<std::size_t O, std::size_t C = dynamic_extent>
+    constexpr typename std::enable_if<C != dynamic_extent,
+        span<T, C> >::type subspan() const {
+        static_assert(O <= E && C <= E - O,
+            "Offset <= Extent && Count <= Extent - Offset");
+        return span<T, C>(s_.p + O, C);
+    }
+
+    constexpr span<T, dynamic_extent> first(size_type c) const {
+        return span<T, dynamic_extent>(s_.p, c);
+    }
+
+    constexpr span<T, dynamic_extent> last(size_type c) const {
+        return span<T, dynamic_extent>(s_.p + (s_.n - c), c);
+    }
+
+    constexpr span<T, dynamic_extent> subspan(size_type o,
+        size_type c = dynamic_extent) const {
+        return span<T, dynamic_extent>(s_.p + o,
+            c == dynamic_extent ? s_.n - o : c);
+    }
+
+    constexpr size_type size() const noexcept {
+        return s_.n;
+    }
+
+    constexpr size_type size_bytes() const noexcept {
+        return s_.n * sizeof(T);
+    }
+
+    constexpr bool empty() const noexcept {
+        return s_.n == 0;
+    }
+
+    constexpr reference operator[](size_type i) const {
+        return s_.p[i];
+    }
+
+    constexpr reference front() const {
+        return *s_.p;
+    }
+
+    constexpr reference back() const {
+        return s_.p[s_.n - 1];
+    }
+
+    constexpr pointer data() const noexcept {
+        return s_.p;
+    }
+
+    constexpr iterator begin() const noexcept {
+        return s_.p;
+    }
+
+    constexpr iterator end() const noexcept {
+        return s_.p + s_.n;
+    }
+
+    constexpr reverse_iterator rbegin() const noexcept {
+        return reverse_iterator(s_.p + s_.n);
+    }
+
+    constexpr reverse_iterator rend() const noexcept {
+        return reverse_iterator(s_.p);
+    }
+
+    constexpr const_iterator cbegin() const noexcept {
+        return s_.p;
+    }
+
+    constexpr const_iterator cend() const noexcept {
+        return s_.p + s_.n;
+    }
+
+    constexpr const_reverse_iterator crbegin() const noexcept {
+        return const_reverse_iterator(s_.p + s_.n);
+    }
+
+    constexpr const_reverse_iterator crend() const noexcept {
+        return const_reverse_iterator(s_.p);
+    }
+
+private:
+    detail::span_store<T, E> s_;
+};
+
+template<class T, std::size_t E>
+constexpr std::size_t span<T, E>::extent;
+
+#ifdef __cpp_deduction_guides
+template<class I, class L>
+span(I*, L) -> span<I>;
+
+template<class T, std::size_t N>
+span(T(&)[N]) -> span<T, N>;
+
+template<class T, std::size_t N>
+span(std::array<T, N>&) -> span<T, N>;
+
+template<class T, std::size_t N>
+span(const std::array<T, N>&) -> span<const T, N>;
+
+template<class R>
+span(R&&) -> span<typename detail::span_data<R>::type>;
+
+template<class T, std::size_t E>
+span(span<T, E>) -> span<T, E>;
+#endif
+
+#ifdef __cpp_lib_byte
+template<class T, std::size_t E>
+inline span<const std::byte, detail::span_bytes<T, E>::value>
+as_bytes(span<T, E> s) noexcept
+{
+    return span<const std::byte, detail::span_bytes<T,
+        E>::value>(reinterpret_cast<const std::byte*>(s.data()),
+            s.size_bytes());
+}
+
+template<class T, std::size_t E>
+inline typename std::enable_if<!std::is_const<T>::value,
+    span<std::byte, detail::span_bytes<T, E>::value> >::type
+as_writable_bytes(span<T, E> s) noexcept
+{
+    return span<std::byte, detail::span_bytes<T,
+        E>::value>(reinterpret_cast<std::byte*>(s.data()), s.size_bytes());
+}
+#endif
+
+} /* boost */
+
+#endif

include/boost/core/swap.hpp

@@ -23,9 +23,12 @@
 
 #include <boost/core/enable_if.hpp>
 #include <boost/config.hpp>
-#include <utility> //for std::swap (C++11)
-#include <algorithm> //for std::swap (C++98)
-#include <cstddef> //for std::size_t
+#if __cplusplus >= 201103L || defined(BOOST_DINKUMWARE_STDLIB)
+#include <utility> // for std::swap (C++11)
+#else
+#include <algorithm> // for std::swap (C++98)
+#endif
+#include <cstddef> // for std::size_t
 
 namespace boost_swap_impl
 {

include/boost/core/typeinfo.hpp

@@ -47,7 +47,7 @@ public:
 
     bool operator==( typeinfo const& rhs ) const
     {
-#if ( defined(_WIN32) || defined(__CYGWIN__) ) && defined(__GNUC__) && !defined(BOOST_DISABLE_CURRENT_FUNCTION)
+#if ( defined(_WIN32) || defined(__CYGWIN__) ) && ( defined(__GNUC__) || defined(__clang__) ) && !defined(BOOST_DISABLE_CURRENT_FUNCTION)
 
         return lib_id_ == rhs.lib_id_? this == &rhs: std::strcmp( name_, rhs.name_ ) == 0;
 
@@ -65,7 +65,7 @@ public:
 
     bool before( typeinfo const& rhs ) const
     {
-#if ( defined(_WIN32) || defined(__CYGWIN__) ) && defined(__GNUC__) && !defined(BOOST_DISABLE_CURRENT_FUNCTION)
+#if ( defined(_WIN32) || defined(__CYGWIN__) ) && ( defined(__GNUC__) || defined(__clang__) ) && !defined(BOOST_DISABLE_CURRENT_FUNCTION)
 
         return lib_id_ == rhs.lib_id_? std::less< typeinfo const* >()( this, &rhs ): std::strcmp( name_, rhs.name_ ) < 0;
 

include/boost/core/uncaught_exceptions.hpp

@@ -1,5 +1,5 @@
 /*
- *             Copyright Andrey Semashev 2018.
+ *          Copyright Andrey Semashev 2018 - 2020.
  * Distributed under the Boost Software License, Version 1.0.
  *    (See accompanying file LICENSE_1_0.txt or copy at
  *          https://www.boost.org/LICENSE_1_0.txt)
@@ -9,7 +9,7 @@
  * \author Andrey Semashev
  * \date   2018-11-10
  *
- * \brief  This header provides an `uncaught_exception` function implementation, which was introduced in C++17.
+ * \brief  This header provides an `uncaught_exceptions` function implementation, which was introduced in C++17.
  *
  * The code in this file is based on the implementation by Evgeny Panasyuk:
  *
@@ -26,9 +26,24 @@
 #pragma once
 #endif
 
-// Visual Studio 14 supports N4152 std::uncaught_exceptions()
-#if (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411) || \
-    (defined(_MSC_VER) && _MSC_VER >= 1900)
+#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:
+// - Mac OS >= 10.12
+// - iOS >= 10.0
+// - tvOS >= 10.0
+// - watchOS >= 3.0
+// https://github.com/boostorg/core/issues/80
+#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(_MSC_VER) && _MSC_VER >= 1900)
 #define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
 #endif
 
@@ -46,7 +61,11 @@
 #if defined(BOOST_CORE_HAS_CXXABI_H)
 // MinGW GCC 4.4 seem to not work the same way the newer GCC versions do. As a result, __cxa_get_globals based implementation will always return 0.
 // Just disable it for now and fall back to std::uncaught_exception().
-#if !(defined(__MINGW32__) && (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 405))
+// On AIX, xlclang++ does have cxxabi.h but doesn't have __cxa_get_globals (https://github.com/boostorg/core/issues/78).
+#if !( \
+        (defined(__MINGW32__) && (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 405)) || \
+        defined(__ibmxl__) \
+    )
 #include <cxxabi.h>
 #include <cstring>
 #define BOOST_CORE_HAS_CXA_GET_GLOBALS
@@ -56,10 +75,15 @@
 // On Linux with clang and libc++ and on OS X, there is a version of cxxabi.h from libc++abi that doesn't declare __cxa_get_globals, but provides __cxa_uncaught_exceptions.
 // The function only appeared in version _LIBCPPABI_VERSION >= 1002 of the library. Unfortunately, there are linking errors about undefined reference to __cxa_uncaught_exceptions
 // on Ubuntu Trusty and OS X, so we avoid using it and forward-declare __cxa_get_globals instead.
+// On QNX SDP 7.0 (QCC 5.4.0), there are multiple cxxabi.h, one from glibcxx from gcc and another from libc++abi from LLVM. Which one is included will be determined by the qcc
+// command line arguments (-V and/or -Y; http://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.utilities/topic/q/qcc.html). The LLVM libc++abi is missing the declaration
+// of __cxa_get_globals but it is also patched by QNX developers to not define _LIBCPPABI_VERSION. Older QNX SDP versions, up to and including 6.6, don't provide LLVM and libc++abi.
+// See https://github.com/boostorg/core/issues/59.
 #if !defined(__FreeBSD__) && \
     ( \
         (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 407) || \
         defined(__OpenBSD__) || \
+        (defined(__QNXNTO__) && !defined(__GLIBCXX__) && !defined(__GLIBCPP__)) || \
         defined(_LIBCPPABI_VERSION) \
     )
 namespace __cxxabiv1 {
@@ -71,7 +95,7 @@ extern "C" __cxa_eh_globals* __cxa_get_globals() BOOST_NOEXCEPT_OR_NOTHROW __att
 #endif
 } // namespace __cxxabiv1
 #endif
-#endif // !(defined(__MINGW32__) && (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 405))
+#endif
 #endif // defined(BOOST_CORE_HAS_CXXABI_H)
 
 #if defined(_MSC_VER) && _MSC_VER >= 1400

include/boost/core/use_default.hpp

@@ -0,0 +1,17 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_CORE_USE_DEFAULT_HPP
+#define BOOST_CORE_USE_DEFAULT_HPP
+
+namespace boost {
+
+struct use_default { };
+
+} /* boost */
+
+#endif

include/boost/core/verbose_terminate_handler.hpp

@@ -0,0 +1,88 @@
+#ifndef BOOST_CORE_VERBOSE_TERMINATE_HANDLER_HPP_INCLUDED
+#define BOOST_CORE_VERBOSE_TERMINATE_HANDLER_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  Copyright 2022 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/throw_exception.hpp>
+#include <boost/config.hpp>
+#include <exception>
+#include <typeinfo>
+#include <cstdlib>
+#include <cstdio>
+
+namespace boost
+{
+namespace core
+{
+
+BOOST_NORETURN inline void verbose_terminate_handler()
+{
+    std::set_terminate( 0 );
+
+#if defined(BOOST_NO_EXCEPTIONS)
+
+    std::fputs( "std::terminate called with exceptions disabled\n", stderr );
+
+#else
+
+    try
+    {
+        throw;
+    }
+    catch( std::exception const& x )
+    {
+#if defined(BOOST_NO_RTTI)
+
+        char const * typeid_name = "unknown (RTTI is disabled)";
+
+#else
+
+        char const * typeid_name = typeid( x ).name();
+
+        boost::core::scoped_demangled_name typeid_demangled_name( typeid_name );
+
+        if( typeid_demangled_name.get() != 0 )
+        {
+            typeid_name = typeid_demangled_name.get();
+        }
+
+#endif
+
+        boost::source_location loc = boost::get_throw_location( x );
+
+        std::fprintf( stderr,
+            "std::terminate called after throwing an exception:\n\n"
+            "      type: %s\n"
+            "    what(): %s\n"
+            "  location: %s:%lu:%lu in function '%s'\n",
+
+            typeid_name,
+            x.what(),
+            loc.file_name(), static_cast<unsigned long>( loc.line() ),
+            static_cast<unsigned long>( loc.column() ), loc.function_name()
+        );
+    }
+    catch( ... )
+    {
+        std::fputs( "std::terminate called after throwing an unknown exception\n", stderr );
+    }
+
+#endif
+
+    std::fflush( stdout );
+    std::abort();
+}
+
+} // namespace core
+} // namespace boost
+
+#endif  // #ifndef BOOST_CORE_VERBOSE_TERMINATE_HANDLER_HPP_INCLUDED

include/boost/detail/iterator.hpp

@@ -6,7 +6,11 @@
 #ifndef ITERATOR_DWA122600_HPP_
 #define ITERATOR_DWA122600_HPP_
 
-// This header is obsolete and will be deprecated.
+// This header is obsolete and deprecated.
+
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED("<iterator>")
 
 #include <iterator>
 #if defined(__SUNPRO_CC) && (defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION))

include/boost/detail/no_exceptions_support.hpp

@@ -12,6 +12,10 @@
 // The header file at this path is deprecated;
 // use boost/core/no_exceptions_support.hpp instead.
 
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED("<boost/core/no_exceptions_support.hpp>")
+
 #include <boost/core/no_exceptions_support.hpp>
 
 #endif

include/boost/detail/scoped_enum_emulation.hpp

@@ -12,6 +12,10 @@
 // The header file at this path is deprecated;
 // use boost/core/scoped_enum.hpp instead.
 
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED("<boost/core/scoped_enum.hpp>")
+
 #include <boost/core/scoped_enum.hpp>
 
 #endif

include/boost/detail/sp_typeinfo.hpp

@@ -18,6 +18,9 @@
 //  http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/core/typeinfo.hpp>
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED( "<boost/core/typeinfo.hpp>" )
 
 namespace boost
 {

include/boost/iterator.hpp

@@ -5,7 +5,9 @@
 #ifndef BOOST_ITERATOR_HPP
 #define BOOST_ITERATOR_HPP
 
-// This header is obsolete and will be deprecated.
+#include <boost/config/header_deprecated.hpp>
+
+BOOST_HEADER_DEPRECATED("<iterator>")
 
 #include <iterator>
 #include <cstddef>           // std::ptrdiff_t

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/CMakeLists.txt

@@ -0,0 +1,32 @@
+# Copyright 2018-2021 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(BoostTestJamfile OPTIONAL RESULT_VARIABLE HAVE_BOOST_TEST)
+
+if(HAVE_BOOST_TEST)
+
+boost_test_jamfile(FILE Jamfile.v2 LINK_LIBRARIES Boost::core Boost::static_assert)
+
+set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::type_traits)
+
+boost_test(TYPE run SOURCES eif_constructors.cpp)
+boost_test(TYPE run SOURCES eif_dummy_arg_disambiguation.cpp)
+boost_test(TYPE run SOURCES eif_lazy.cpp)
+boost_test(TYPE run SOURCES eif_lazy_test.cpp)
+boost_test(TYPE run SOURCES eif_member_templates.cpp)
+boost_test(TYPE run SOURCES eif_namespace_disambiguation.cpp)
+boost_test(TYPE run SOURCES eif_no_disambiguation.cpp)
+boost_test(TYPE run SOURCES eif_partial_specializations.cpp)
+
+set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::throw_exception)
+
+boost_test(TYPE run SOURCES no_exceptions_support_test.cpp)
+
+set(BOOST_TEST_LINK_LIBRARIES Boost::core Boost::utility)
+
+boost_test(TYPE run SOURCES sv_conversion_test2.cpp)
+
+endif()
+
+add_subdirectory(swap)

test/Jamfile.v2

@@ -1,6 +1,6 @@
 #  Boost.Core Library test Jamfile
 #
-#  Copyright (c) 2014, 2017 Peter Dimov
+#  Copyright (c) 2014-2021 Peter Dimov
 #
 #  Distributed under the Boost Software License, Version 1.0.
 #  See accompanying file LICENSE_1_0.txt or copy at
@@ -9,6 +9,19 @@
 import modules ;
 import testing ;
 
+project : requirements
+
+  <warnings>extra
+  <toolset>msvc:<warnings-as-errors>on
+  <toolset>clang:<warnings-as-errors>on
+  <toolset>gcc:<warnings-as-errors>on
+  <toolset>gcc-4.4:<cxxflags>-Wno-sign-compare ;
+
+local warning-as-errors-off =
+    "-<toolset>msvc:<warnings-as-errors>on"
+    "-<toolset>gcc:<warnings-as-errors>on"
+    "-<toolset>clang:<warnings-as-errors>on" ;
+
 # quick test (for CI)
 run quick.cpp ;
 
@@ -18,47 +31,65 @@ run addressof_test2.cpp ;
 run addressof_np_test.cpp ;
 run addressof_fn_test.cpp ;
 compile addressof_constexpr_test.cpp ;
-compile-fail addressof_fail_rvalue.cpp ;
+compile-fail addressof_fail_rvalue.cpp
+  : $(warning-as-errors-off) ;
 
 run checked_delete_test.cpp ;
-compile-fail checked_delete_fail.cpp ;
-compile-fail checked_delete_fail2.cpp ;
+compile-fail checked_delete_fail.cpp
+  : $(warning-as-errors-off) ;
+compile-fail checked_delete_fail2.cpp
+  : $(warning-as-errors-off) ;
 
 compile ref_ct_test.cpp ;
 run ref_test.cpp ;
 run ref_ref_test.cpp ;
 run ref_fn_test.cpp ;
-compile-fail ref_rv_fail1.cpp ;
-compile-fail ref_rv_fail2.cpp ;
-compile-fail ref_rv_fail3.cpp ;
-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_rv_fail1.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_rv_fail2.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_rv_fail3.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_rv_fail4.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_rv_fail5.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_implicit_fail.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_implicit_fail2.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_implicit_fail3.cpp
+  : $(warning-as-errors-off) ;
+compile-fail ref_implicit_fail4.cpp
+  : $(warning-as-errors-off) ;
 run ref_cv_test.cpp ;
+run ref_conversion_test.cpp ;
 
-run eif_constructors.cpp ;
-run eif_dummy_arg_disambiguation.cpp ;
-run eif_lazy.cpp ;
-run eif_lazy_test.cpp ;
-run eif_member_templates.cpp ;
-run eif_namespace_disambiguation.cpp ;
-run eif_no_disambiguation.cpp ;
-run eif_partial_specializations.cpp ;
+run eif_constructors.cpp : ;
+run eif_dummy_arg_disambiguation.cpp : ;
+run eif_lazy.cpp : ;
+run eif_lazy_test.cpp : ;
+run eif_member_templates.cpp : ;
+run eif_namespace_disambiguation.cpp : ;
+run eif_no_disambiguation.cpp : ;
+run eif_partial_specializations.cpp : ;
 
-compile-fail noncopyable_compile_fail.cpp ;
+compile-fail noncopyable_compile_fail.cpp
+  : $(warning-as-errors-off) ;
 
 run explicit_operator_bool.cpp ;
 run explicit_operator_bool_noexcept.cpp ;
-compile-fail explicit_operator_bool_compile_fail_conv_int.cpp ;
-compile-fail explicit_operator_bool_compile_fail_conv_pvoid.cpp ;
-compile-fail explicit_operator_bool_compile_fail_delete.cpp ;
-compile-fail explicit_operator_bool_compile_fail_shift.cpp ;
+compile-fail explicit_operator_bool_compile_fail_conv_int.cpp
+  : $(warning-as-errors-off) ;
+compile-fail explicit_operator_bool_compile_fail_conv_pvoid.cpp
+  : $(warning-as-errors-off) ;
+compile-fail explicit_operator_bool_compile_fail_delete.cpp
+  : $(warning-as-errors-off) ;
+compile-fail explicit_operator_bool_compile_fail_shift.cpp
+  : $(warning-as-errors-off) ;
+
+compile ignore_unused_test.cpp ;
 
-compile ignore_unused_test.cpp : <toolset>gcc-4.8:<cxxflags>"-Wunused-variable -Wunused-local-typedefs -Werror"
-                                   <toolset>gcc:<cxxflags>"-Wunused-variable -Werror"
-                                   <toolset>clang:<cxxflags>"-Wunused-variable -Werror"
-                                   <toolset>msvc:<cxxflags>"/we4100 /we4101" ;
 run sp_typeinfo_test.cpp ;
 run sp_typeinfo_test.cpp : : : <rtti>off : sp_typeinfo_test_no_rtti ;
 
@@ -66,18 +97,39 @@ run visit_each_test.cpp ;
 
 run get_pointer_test.cpp ;
 
-run lightweight_test_test.cpp ;
-run lightweight_test_test.cpp : : : <exception-handling>off : lightweight_test_test_no_except ;
-run lightweight_test_test2.cpp ;
-run lightweight_test_all_eq_test.cpp ;
-run lightweight_test_all_with_test.cpp ;
-run lightweight_test_all_with_fail.cpp ;
-run lightweight_test_lt_le_test.cpp ;
-run lightweight_test_gt_ge_test.cpp ;
-run lightweight_test_eq_nullptr.cpp ;
-run lightweight_test_test3.cpp ;
-run lightweight_test_test4.cpp ;
-run lightweight_test_test5.cpp ;
+local pedantic-errors = <warnings>pedantic
+    <toolset>msvc:<warnings-as-errors>on
+    <toolset>gcc:<warnings-as-errors>on
+    <toolset>clang:<warnings-as-errors>on ;
+
+run lightweight_test_test.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_test.cpp : : :
+  <exception-handling>off $(pedantic-errors) : lightweight_test_test_no_except ;
+run lightweight_test_test2.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_all_with_test.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_lt_le_test.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_gt_ge_test.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_eq_nullptr.cpp
+  : : : $(pedantic-errors) ;
+run lightweight_test_test3.cpp
+  : : : $(pedantic-errors) ;
+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:<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 ;
 
 run-fail lightweight_test_fail.cpp ;
 run-fail lightweight_test_fail2.cpp ;
@@ -86,17 +138,28 @@ run-fail lightweight_test_fail4.cpp ;
 run-fail lightweight_test_fail5.cpp ;
 run-fail lightweight_test_fail6.cpp ;
 run-fail lightweight_test_fail7.cpp ;
-run-fail lightweight_test_fail7.cpp : : : <rtti>off : lightweight_test_fail7_no_rtti ;
+run-fail lightweight_test_fail7.cpp : : : <rtti>off <toolset>gcc-4.4:<build>no : lightweight_test_fail7_no_rtti ;
 run-fail lightweight_test_fail8.cpp ;
-run-fail lightweight_test_fail8.cpp : : : <rtti>off : lightweight_test_fail8_no_rtti ;
+run-fail lightweight_test_fail8.cpp : : : <rtti>off <toolset>gcc-4.4:<build>no : lightweight_test_fail8_no_rtti ;
 run-fail lightweight_test_fail9.cpp ;
 run-fail lightweight_test_fail10.cpp ;
-run-fail lightweight_test_fail11.cpp ;
+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 ;
 run-fail lightweight_test_ge_fail.cpp ;
 
+run lightweight_test_bool.cpp
+  : : : $(pedantic-errors) ;
+
+run lightweight_test_with_test.cpp
+  : : : $(pedantic-errors) ;
+run-fail lightweight_test_with_fail.cpp ;
+
 run is_same_test.cpp ;
 
 run typeinfo_test.cpp ;
@@ -105,14 +168,19 @@ run typeinfo_test.cpp : : : <rtti>off : typeinfo_test_no_rtti ;
 run iterator_test.cpp ;
 run detail_iterator_test.cpp ;
 
-run demangle_test.cpp  : : : <test-info>always_show_run_output ;
+run demangle_test.cpp
+  : : : <test-info>always_show_run_output ;
+
+run demangled_name_test.cpp
+  : : : <test-info>always_show_run_output ;
 
-run demangled_name_test.cpp  : : : <test-info>always_show_run_output ;
 run demangled_name_test.cpp  : : : <rtti>off <test-info>always_show_run_output : demangled_name_test_no_rtti ;
 
 run scoped_enum.cpp ;
-compile-fail scoped_enum_compile_fail_conv_from_int.cpp ;
-compile-fail scoped_enum_compile_fail_conv_to_int.cpp ;
+compile-fail scoped_enum_compile_fail_conv_from_int.cpp
+  : $(warning-as-errors-off) ;
+compile-fail scoped_enum_compile_fail_conv_to_int.cpp
+  : $(warning-as-errors-off) ;
 
 run underlying_type.cpp ;
 
@@ -121,27 +189,157 @@ run pointer_traits_element_type_test.cpp ;
 run pointer_traits_difference_type_test.cpp ;
 run pointer_traits_rebind_test.cpp ;
 run pointer_traits_pointer_to_test.cpp ;
+run pointer_traits_sfinae_test.cpp ;
+run pointer_traits_rebind_sfinae_test.cpp ;
+run pointer_traits_pointer_to_sfinae_test.cpp ;
 run to_address_test.cpp ;
 
 run exchange_test.cpp ;
 run exchange_move_test.cpp ;
 
+run first_scalar_test.cpp ;
+compile first_scalar_constexpr_test.cpp ;
+
 run empty_value_test.cpp ;
 run empty_value_size_test.cpp ;
+run empty_value_final_test.cpp ;
 
 run quick_exit_test.cpp ;
 run-fail quick_exit_fail.cpp ;
 
+compile use_default_test.cpp ;
+
+run default_allocator_test.cpp
+  : : : <warnings>pedantic
+        <toolset>msvc:<warnings-as-errors>on
+        <toolset>gcc:<warnings-as-errors>on
+        <toolset>clang:<warnings-as-errors>on ;
+run default_allocator_allocate_hint_test.cpp ;
+
+run noinit_adaptor_test.cpp ;
+run alloc_construct_test.cpp ;
+run alloc_construct_throws_test.cpp ;
+run alloc_construct_cxx11_test.cpp ;
+
+run nvp_test.cpp ;
+
+run allocator_value_type_test.cpp ;
+run allocator_pointer_test.cpp ;
+run allocator_const_pointer_test.cpp ;
+run allocator_void_pointer_test.cpp ;
+run allocator_const_void_pointer_test.cpp ;
+run allocator_difference_type_test.cpp ;
+run allocator_size_type_test.cpp ;
+run allocator_pocca_test.cpp ;
+run allocator_pocma_test.cpp ;
+run allocator_pocs_test.cpp ;
+run allocator_is_always_equal_test.cpp ;
+run allocator_rebind_test.cpp ;
+run allocator_allocate_test.cpp ;
+run allocator_allocate_hint_test.cpp ;
+run allocator_deallocate_test.cpp ;
+run allocator_max_size_test.cpp ;
+run allocator_soccc_test.cpp ;
+run allocator_construct_test.cpp ;
+run allocator_destroy_test.cpp ;
+run allocator_construct_n_test.cpp ;
+run allocator_destroy_n_test.cpp ;
+run allocator_traits_test.cpp ;
+
 lib lib_typeid : lib_typeid.cpp : <link>shared:<define>LIB_TYPEID_DYN_LINK=1 ;
 
 run test_lib_typeid.cpp lib_typeid : : : <link>shared : test_lib_typeid_shared ;
 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_typeid.cpp lib_typeid : : : <link>static <rtti>off : test_lib_typeid_static_no_rtti ;
 
-run uncaught_exceptions.cpp : : : <exception-handling>on ;
-run uncaught_exceptions_np.cpp : : : <exception-handling>on ;
+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
+  : : : <exception-handling>on ;
+
+run no_exceptions_support_test.cpp : ;
+run no_exceptions_support_test.cpp : : : <exception-handling>off : no_exceptions_support_test_nx ;
+
+run cmath_test.cpp
+  : : : $(pedantic-errors) ;
+run cmath_test.cpp : : : <define>BOOST_CORE_USE_GENERIC_CMATH <toolset>msvc-8.0:<build>no : cmath_test_generic ;
+
+run bit_cast_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_rotate_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_countr_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_countl_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_width_test.cpp
+  : : : $(pedantic-errors) ;
+run has_single_bit_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_floor_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_ceil_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_popcount_test.cpp
+  : : : $(pedantic-errors) ;
+run bit_endian_test.cpp
+  : : : $(pedantic-errors) ;
+
+run type_name_test.cpp ;
+
+run sv_types_test.cpp ;
+run sv_construct_test.cpp ;
+run sv_iteration_test.cpp ;
+run sv_element_access_test.cpp ;
+run sv_modifiers_test.cpp ;
+run sv_copy_test.cpp ;
+run sv_substr_test.cpp ;
+run sv_compare_test.cpp ;
+run sv_starts_with_test.cpp ;
+run sv_ends_with_test.cpp ;
+run sv_find_test.cpp ;
+run sv_rfind_test.cpp ;
+run sv_find_first_of_test.cpp
+  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+run sv_find_last_of_test.cpp
+  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+run sv_find_first_not_of_test.cpp
+  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+run sv_find_last_not_of_test.cpp
+  : : : <toolset>gcc-4.4:<cxxflags>-Wno-type-limits ;
+run sv_contains_test.cpp ;
+run sv_eq_test.cpp ;
+run sv_lt_test.cpp ;
+run sv_stream_insert_test.cpp ;
+run sv_conversion_test.cpp ;
+run sv_conversion_test2.cpp : ;
+run sv_common_reference_test.cpp ;
+compile sv_common_reference_test2.cpp ;
+compile sv_windows_h_test.cpp ;
+
+run span_test.cpp ;
+run span_types_test.cpp ;
+run span_constructible_test.cpp ;
+run span_deduction_guide_test.cpp ;
+run as_bytes_test.cpp ;
+run as_writable_bytes_test.cpp ;
+compile span_boost_begin_test.cpp ;
+
+run splitmix64_test.cpp
+  : : : $(pedantic-errors) ;
+
+run-fail verbose_terminate_handler_fail.cpp : ;
+run-fail verbose_terminate_handler_fail.cpp : : : <exception-handling>off : verbose_terminate_handler_fail_nx ;
+run-fail verbose_terminate_handler_fail.cpp : : : <rtti>off : verbose_terminate_handler_fail_nr ;
+run-fail verbose_terminate_handler_fail.cpp : : : <exception-handling>off <rtti>off : verbose_terminate_handler_fail_nxr ;
 
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;

test/addressof_fn_test.cpp

@@ -16,7 +16,7 @@
 //  http://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/utility/addressof.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 
 
 void f0()

test/addressof_np_test.cpp

@@ -7,7 +7,7 @@
 //
 
 #include <boost/utility/addressof.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <cstddef>
 
 #if defined( BOOST_NO_CXX11_NULLPTR )

test/addressof_test.cpp

@@ -20,7 +20,7 @@
 #pragma warning(pop)
 #endif
 
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 
 template<class T> void scalar_test( T * = 0 )
 {

test/addressof_test2.cpp

@@ -22,7 +22,7 @@
 #pragma warning(pop)
 #endif
 
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 
 template<class T> void scalar_test( T * = 0 )
 {

test/alloc_construct_cxx11_test.cpp

@@ -0,0 +1,82 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+#include <boost/core/alloc_construct.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4100) // unreferenced parameter 'ptr'
+#endif
+
+class type {
+public:
+    explicit type(int x)
+        : value_(x) { }
+
+    int value() const {
+        return value_;
+    }
+
+    static int count;
+
+private:
+    type(const type&);
+    type& operator=(const type&);
+
+    int value_;
+};
+
+int type::count = 0;
+
+template<class T>
+struct creator {
+    typedef T value_type;
+
+    creator() { }
+
+    template<class U>
+    creator(const creator<U>&) { }
+
+    T* allocate(std::size_t size) {
+        return static_cast<T*>(::operator new(sizeof(T) * size));
+    }
+
+    void deallocate(T* ptr, std::size_t) {
+        ::operator delete(ptr);
+    }
+
+    template<class V>
+    void construct(type* ptr, const V& value) {
+        ::new(static_cast<void*>(ptr)) type(value + 1);
+        ++type::count;
+    }
+
+    void destroy(type* ptr) {
+        ptr->~type();
+        --type::count;
+    }
+};
+
+int main()
+{
+    creator<type> a;
+    type* p = a.allocate(1);
+    boost::alloc_construct(a, p, 1);
+    BOOST_TEST_EQ(type::count, 1);
+    BOOST_TEST_EQ(p->value(), 2);
+    boost::alloc_destroy(a, p);
+    BOOST_TEST_EQ(type::count, 0);
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif

test/alloc_construct_test.cpp

@@ -0,0 +1,135 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/alloc_construct.hpp>
+#include <boost/core/default_allocator.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+class type {
+public:
+    explicit type(int x = 0, int y = 0)
+        : value_(x + y) {
+        ++count;
+    }
+
+    type(const type& other)
+        : value_(other.value_) {
+        ++count;
+    }
+
+    ~type() {
+        --count;
+    }
+
+    int value() const {
+        return value_;
+    }
+
+    static int count;
+
+private:
+    int value_;
+};
+
+int type::count = 0;
+
+void test_construct()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(1);
+    boost::alloc_construct(a, p);
+    BOOST_TEST_EQ(type::count, 1);
+    BOOST_TEST_EQ(p->value(), 0);
+    boost::alloc_destroy(a, p);
+    BOOST_TEST_EQ(type::count, 0);
+    a.deallocate(p, 1);
+}
+
+void test_construct_value()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(1);
+    boost::alloc_construct(a, p, 1);
+    BOOST_TEST_EQ(type::count, 1);
+    BOOST_TEST_EQ(p->value(), 1);
+    boost::alloc_destroy(a, p);
+    BOOST_TEST_EQ(type::count, 0);
+    a.deallocate(p, 1);
+}
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
+    !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+void test_construct_args()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(1);
+    boost::alloc_construct(a, p, 1, 2);
+    BOOST_TEST_EQ(type::count, 1);
+    BOOST_TEST_EQ(p->value(), 3);
+    boost::alloc_destroy(a, p);
+    BOOST_TEST_EQ(type::count, 0);
+    a.deallocate(p, 1);
+}
+#endif
+
+void test_construct_n()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(3);
+    boost::alloc_construct_n(a, p, 3);
+    BOOST_TEST_EQ(type::count, 3);
+    BOOST_TEST_EQ(p[0].value(), 0);
+    BOOST_TEST_EQ(p[1].value(), 0);
+    BOOST_TEST_EQ(p[2].value(), 0);
+    boost::alloc_destroy_n(a, p, 3);
+    BOOST_TEST_EQ(type::count, 0);
+    a.deallocate(p, 3);
+}
+
+void test_construct_n_list()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(3);
+    type q(1);
+    boost::alloc_construct_n(a, p, 3, &q, 1);
+    BOOST_TEST_EQ(type::count, 4);
+    BOOST_TEST_EQ(p[0].value(), 1);
+    BOOST_TEST_EQ(p[1].value(), 1);
+    BOOST_TEST_EQ(p[2].value(), 1);
+    boost::alloc_destroy_n(a, p, 3);
+    BOOST_TEST_EQ(type::count, 1);
+    a.deallocate(p, 3);
+}
+
+void test_construct_n_iterator()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(3);
+    type l[] = { type(1), type(2), type(3) };
+    boost::alloc_construct_n(a, p, 3, &l[0]);
+    BOOST_TEST_EQ(type::count, 6);
+    BOOST_TEST_EQ(p[0].value(), 1);
+    BOOST_TEST_EQ(p[1].value(), 2);
+    BOOST_TEST_EQ(p[2].value(), 3);
+    boost::alloc_destroy_n(a, p, 3);
+    BOOST_TEST_EQ(type::count, 3);
+    a.deallocate(p, 3);
+}
+
+int main()
+{
+    test_construct();
+    test_construct_value();
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
+    !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    test_construct_args();
+#endif
+    test_construct_n();
+    test_construct_n_list();
+    test_construct_n_iterator();
+    return boost::report_errors();
+}

test/alloc_construct_throws_test.cpp

@@ -0,0 +1,46 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/alloc_construct.hpp>
+#include <boost/core/default_allocator.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+class type {
+public:
+    type() {
+        if (count == 4) {
+            throw true;
+        }
+        ++count;
+    }
+
+    ~type() {
+        --count;
+    }
+
+    static int count;
+
+private:
+    type(const type&);
+    type& operator=(const type&);
+};
+
+int type::count = 0;
+
+int main()
+{
+    boost::default_allocator<type> a;
+    type* p = a.allocate(5);
+    try {
+        boost::alloc_construct_n(a, p, 5);
+        BOOST_ERROR("construct_n did not throw");
+    } catch (...) {
+        BOOST_TEST_EQ(type::count, 0);
+    }
+    a.deallocate(p, 5);
+    return boost::report_errors();
+}

test/allocator_allocate_hint_test.cpp

@@ -0,0 +1,59 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef std::size_t size_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    template<class U>
+    struct rebind {
+        typedef A1<U> other;
+    };
+    A1()
+        : value() { }
+    T* allocate(std::size_t n, const void*) {
+        value = n;
+        return 0;
+    }
+    std::size_t value;
+};
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T>
+struct A2 {
+    typedef T value_type;
+    A2()
+        : value() { }
+    T* allocate(std::size_t n) {
+        value = n;
+        return 0;
+    }
+    std::size_t value;
+};
+#endif
+
+int main()
+{
+    {
+        A1<int> a;
+        BOOST_TEST_NOT(boost::allocator_allocate(a, 5, 0));
+        BOOST_TEST_EQ(a.value, 5);
+    }
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+    {
+        A2<int> a;
+        BOOST_TEST_NOT(boost::allocator_allocate(a, 5, 0));
+        BOOST_TEST_EQ(a.value, 5);
+    }
+#endif
+    return boost::report_errors();
+}

test/allocator_allocate_test.cpp

@@ -0,0 +1,31 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A {
+    typedef T value_type;
+    typedef T* pointer;
+    typedef std::size_t size_type;
+    A()
+        : value() { }
+    T* allocate(std::size_t n) {
+        value = n;
+        return 0;
+    }
+    std::size_t value;
+};
+
+int main()
+{
+    A<int> a;
+    BOOST_TEST_NOT(boost::allocator_allocate(a, 5));
+    BOOST_TEST_EQ(a.value, 5);
+    return boost::report_errors();
+}

test/allocator_const_pointer_test.cpp

@@ -0,0 +1,30 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef int* const_pointer;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int*,
+        boost::allocator_const_pointer<A1<char> >::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<const int*,
+        boost::allocator_const_pointer<A2<int> >::type>));
+    return boost::report_errors();
+}

test/allocator_const_void_pointer_test.cpp

@@ -0,0 +1,35 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef int* const_pointer;
+    typedef int* const_void_pointer;
+    template<class U>
+    struct rebind {
+        typedef A1<U> other;
+    };
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int*,
+        boost::allocator_const_void_pointer<A1<char> >::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<const void*,
+        boost::allocator_const_void_pointer<A2<int> >::type>));
+    return boost::report_errors();
+}

test/allocator_construct_n_test.cpp

@@ -0,0 +1,47 @@
+/*
+Copyright 2022 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A {
+    typedef T value_type;
+    A() { }
+};
+
+int main()
+{
+    {
+        A<int> a;
+        int i[3] = { 5, 5, 5 };
+        boost::allocator_construct_n(a, &i[0], 3);
+        BOOST_TEST_EQ(i[0], 0);
+        BOOST_TEST_EQ(i[1], 0);
+        BOOST_TEST_EQ(i[2], 0);
+    }
+    {
+        A<int> a;
+        int i[4] = { 5, 5, 5, 5 };
+        int j[2] = { 1, 2 };
+        boost::allocator_construct_n(a, &i[0], 4, &j[0], 2);
+        BOOST_TEST_EQ(i[0], 1);
+        BOOST_TEST_EQ(i[1], 2);
+        BOOST_TEST_EQ(i[2], 1);
+        BOOST_TEST_EQ(i[3], 2);
+    }
+    {
+        A<int> a;
+        int i[3] = { 5, 5, 5 };
+        int j[3] = { 1, 2, 3 };
+        boost::allocator_construct_n(a, &i[0], 3, &j[0]);
+        BOOST_TEST_EQ(i[0], 1);
+        BOOST_TEST_EQ(i[1], 2);
+        BOOST_TEST_EQ(i[2], 3);
+    }
+    return boost::report_errors();
+}

test/allocator_construct_test.cpp

@@ -0,0 +1,46 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    A1() { }
+};
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T>
+struct A2 {
+    typedef T value_type;
+    A2() { }
+    template<class U, class V>
+    void construct(U* p, const V& v) {
+        ::new((void*)p) U(v + 1);
+    }
+};
+#endif
+
+int main()
+{
+    {
+        A1<int> a;
+        int i = 0;
+        boost::allocator_construct(a, &i, 5);
+        BOOST_TEST_EQ(i, 5);
+    }
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+    {
+        A2<int> a;
+        int i = 0;
+        boost::allocator_construct(a, &i, 5);
+        BOOST_TEST_EQ(i, 6);
+    }
+#endif
+    return boost::report_errors();
+}

test/allocator_deallocate_test.cpp

@@ -0,0 +1,30 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A {
+    typedef T value_type;
+    typedef T* pointer;
+    typedef std::size_t size_type;
+    A()
+        : value() { }
+    void deallocate(T*, std::size_t n) {
+        value = n;
+    }
+    std::size_t value;
+};
+
+int main()
+{
+    A<int> a;
+    boost::allocator_deallocate(a, 0, 5);
+    BOOST_TEST_EQ(a.value, 5);
+    return boost::report_errors();
+}

test/allocator_destroy_n_test.cpp

@@ -0,0 +1,66 @@
+/*
+Copyright 2022 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct S {
+    static int count;
+    S() {
+        ++count;
+    }
+    S(const S&) {
+        ++count;
+    }
+    ~S() {
+        --count;
+    }
+};
+
+int S::count = 0;
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    A1() { }
+};
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T>
+struct A2 {
+    typedef T value_type;
+    A2() { }
+    template<class U>
+    void destroy(U* p) {
+        *p = U();
+    }
+};
+#endif
+
+int main()
+{
+    {
+        A1<int> a;
+        S s[3];
+        boost::allocator_destroy_n(a, &s[0], 3);
+        BOOST_TEST_EQ(S::count, 0);
+        ::new((void*)&s[0]) S();
+        ::new((void*)&s[1]) S();
+        ::new((void*)&s[2]) S();
+    }
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+    {
+        A2<int> a;
+        int i[3] = { 5, 5, 5 };
+        boost::allocator_destroy_n(a, &i[0], 3);
+        BOOST_TEST_EQ(i[0], 0);
+        BOOST_TEST_EQ(i[1], 0);
+        BOOST_TEST_EQ(i[2], 0);
+    }
+#endif
+    return boost::report_errors();
+}

test/allocator_destroy_test.cpp

@@ -0,0 +1,62 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct S {
+    static int count;
+    S() {
+        ++count;
+    }
+    S(const S&) {
+        ++count;
+    }
+    ~S() {
+        --count;
+    }
+};
+
+int S::count = 0;
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    A1() { }
+};
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T>
+struct A2 {
+    typedef T value_type;
+    A2() { }
+    template<class U>
+    void destroy(U* p) {
+        *p = U();
+    }
+};
+#endif
+
+int main()
+{
+    {
+        A1<int> a;
+        S s;
+        boost::allocator_destroy(a, &s);
+        BOOST_TEST_EQ(S::count, 0);
+        ::new((void*)&s) S();
+    }
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+    {
+        A2<int> a;
+        int i = 5;
+        boost::allocator_destroy(a, &i);
+        BOOST_TEST_EQ(i, 0);
+    }
+#endif
+    return boost::report_errors();
+}

test/allocator_difference_type_test.cpp

@@ -0,0 +1,30 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef short difference_type;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<short,
+        boost::allocator_difference_type<A1<char> >::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<std::ptrdiff_t,
+        boost::allocator_difference_type<A2<int> >::type>));
+    return boost::report_errors();
+}

test/allocator_is_always_equal_test.cpp

@@ -0,0 +1,47 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    int value;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+template<class T>
+struct A3 {
+    typedef T value_type;
+    struct is_always_equal {
+        static const bool value = false;
+    };
+};
+
+template<class T>
+struct A4 {
+    typedef T value_type;
+    struct is_always_equal {
+        static const bool value = true;
+    };
+    int value;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_is_always_equal<A1<int> >::type));
+    BOOST_TEST_TRAIT_TRUE((boost::allocator_is_always_equal<A2<int> >::type));
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_is_always_equal<A3<int> >::type));
+    BOOST_TEST_TRAIT_TRUE((boost::allocator_is_always_equal<A4<int> >::type));
+    return boost::report_errors();
+}

test/allocator_max_size_test.cpp

@@ -0,0 +1,35 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <limits>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef short size_type;
+    A1() { }
+    short max_size() const {
+        return 1;
+    }
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+    typedef short size_type;
+    A2() { }
+};
+
+int main()
+{
+    BOOST_TEST_EQ(boost::allocator_max_size(A1<int>()), 1);
+    BOOST_TEST_LE(boost::allocator_max_size(A2<int>()),
+        (std::numeric_limits<short>::max)());
+    return boost::report_errors();
+}

test/allocator_pocca_test.cpp

@@ -0,0 +1,32 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+    struct propagate_on_container_copy_assignment {
+        static const bool value = true;
+    };
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_FALSE((boost::
+        allocator_propagate_on_container_copy_assignment<A1<int> >::type));
+    BOOST_TEST_TRAIT_TRUE((boost::
+        allocator_propagate_on_container_copy_assignment<A2<int> >::type));
+    return boost::report_errors();
+}

test/allocator_pocma_test.cpp

@@ -0,0 +1,32 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+    struct propagate_on_container_move_assignment {
+        static const bool value = true;
+    };
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_FALSE((boost::
+        allocator_propagate_on_container_move_assignment<A1<int> >::type));
+    BOOST_TEST_TRAIT_TRUE((boost::
+        allocator_propagate_on_container_move_assignment<A2<int> >::type));
+    return boost::report_errors();
+}

test/allocator_pocs_test.cpp

@@ -0,0 +1,32 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+    struct propagate_on_container_swap {
+        static const bool value = true;
+    };
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_FALSE((boost::
+        allocator_propagate_on_container_swap<A1<int> >::type));
+    BOOST_TEST_TRAIT_TRUE((boost::
+        allocator_propagate_on_container_swap<A2<int> >::type));
+    return boost::report_errors();
+}

test/allocator_pointer_test.cpp

@@ -0,0 +1,30 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef int* pointer;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int*,
+        boost::allocator_pointer<A1<char> >::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int*,
+        boost::allocator_pointer<A2<int> >::type>));
+    return boost::report_errors();
+}

test/allocator_rebind_test.cpp

@@ -0,0 +1,33 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    template<class>
+    struct rebind {
+        typedef A1<int> other;
+    };
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<A1<int>,
+        boost::allocator_rebind<A1<char>, bool>::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<A2<int>,
+        boost::allocator_rebind<A2<char>, int>::type>));
+    return boost::report_errors();
+}

test/allocator_size_type_test.cpp

@@ -0,0 +1,35 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef int size_type;
+};
+
+#if !defined(BOOST_NO_CXX11_ALLOCATOR)
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+#endif
+
+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::make_unsigned<std::ptrdiff_t>::type,
+        boost::allocator_size_type<A2<int> >::type>));
+#endif
+    return boost::report_errors();
+}

test/allocator_soccc_test.cpp

@@ -0,0 +1,37 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    A1(int n)
+        : value(n) { }
+    int value;
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+    A2(int n)
+        : value(n) { }
+    A2 select_on_container_copy_construction() const {
+        return A2(value + 1);
+    }
+    int value;
+};
+
+int main()
+{
+    BOOST_TEST_EQ(1, boost::
+        allocator_select_on_container_copy_construction(A1<int>(1)).value);
+    BOOST_TEST_EQ(2, boost::
+        allocator_select_on_container_copy_construction(A2<int>(1)).value);
+    return boost::report_errors();
+}

test/allocator_traits_test.cpp

@@ -0,0 +1,114 @@
+/*
+Copyright 2021 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_traits.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+class creator {
+public:
+    typedef T value_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef void* void_pointer;
+    typedef const void* const_void_pointer;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+
+    template<class U>
+    struct rebind {
+        typedef creator<U> other;
+    };
+
+    explicit creator(int value) BOOST_NOEXCEPT
+        : state_(value) { }
+
+    template<class U>
+    creator(const creator<U>& other) BOOST_NOEXCEPT
+        : state_(other.state) { }
+
+    std::size_t max_size() const BOOST_NOEXCEPT {
+        return static_cast<std::size_t>(-1) / sizeof(T);
+    }
+
+    T* allocate(std::size_t n, const void* = 0) {
+        return static_cast<T*>(::operator new(sizeof(T) * n));
+    }
+
+    void deallocate(T* p, std::size_t) {
+        ::operator delete(p);
+    }
+
+    int state() const {
+        return state_;
+    }
+
+private:
+    int state_;
+};
+
+template<class T, class U>
+inline bool operator==(const creator<T>& lhs,
+    const creator<U>& rhs) BOOST_NOEXCEPT
+{
+    return lhs.state() == rhs.state();
+}
+
+template<class T, class U>
+inline bool operator!=(const creator<T>& lhs,
+    const creator<U>& rhs) BOOST_NOEXCEPT
+{
+    return !(lhs == rhs);
+}
+
+int main()
+{
+    BOOST_TEST_TRAIT_SAME(creator<int>,
+        boost::allocator_traits<creator<int> >::allocator_type);
+    BOOST_TEST_TRAIT_SAME(int,
+        boost::allocator_traits<creator<int> >::value_type);
+    BOOST_TEST_TRAIT_SAME(int*,
+        boost::allocator_traits<creator<int> >::pointer);
+    BOOST_TEST_TRAIT_SAME(const int*,
+        boost::allocator_traits<creator<int> >::const_pointer);
+    BOOST_TEST_TRAIT_SAME(void*,
+        boost::allocator_traits<creator<int> >::void_pointer);
+    BOOST_TEST_TRAIT_SAME(const void*,
+        boost::allocator_traits<creator<int> >::const_void_pointer);
+    BOOST_TEST_TRAIT_SAME(std::ptrdiff_t,
+        boost::allocator_traits<creator<int> >::difference_type);
+    BOOST_TEST_TRAIT_SAME(std::size_t,
+        boost::allocator_traits<creator<int> >::size_type);
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_traits<creator<int> >::
+        propagate_on_container_copy_assignment));
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_traits<creator<int> >::
+        propagate_on_container_move_assignment));
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_traits<creator<int> >::
+        propagate_on_container_swap));
+    BOOST_TEST_TRAIT_FALSE((boost::allocator_traits<creator<int> >::
+        is_always_equal));
+    BOOST_TEST_TRAIT_SAME(creator<char>,
+        boost::allocator_traits<creator<int> >::
+            rebind_traits<char>::allocator_type);
+    creator<int> a(1);
+    int* p1 = boost::allocator_traits<creator<int> >::allocate(a, 1);
+    if (BOOST_TEST(p1)) {
+        boost::allocator_traits<creator<int> >::construct(a, p1, 5);
+        BOOST_TEST_EQ(*p1, 5);
+        boost::allocator_traits<creator<int> >::destroy(a, p1);
+        boost::allocator_traits<creator<int> >::deallocate(a, p1, 1);
+    }
+    int* p2 = boost::allocator_traits<creator<int> >::allocate(a, 1, 0);
+    if (BOOST_TEST(p2)) {
+        boost::allocator_traits<creator<int> >::deallocate(a, p2, 1);
+    }
+    BOOST_TEST_EQ(boost::allocator_traits<creator<int> >::max_size(a),
+        static_cast<std::size_t>(-1) / sizeof(int));
+    BOOST_TEST(boost::allocator_traits<creator<int> >::
+        select_on_container_copy_construction(a) == a);
+    return boost::report_errors();
+}

test/allocator_value_type_test.cpp

@@ -0,0 +1,22 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int,
+        boost::allocator_value_type<A<int> >::type>));
+    return boost::report_errors();
+}

test/allocator_void_pointer_test.cpp

@@ -0,0 +1,35 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<class T>
+struct A1 {
+    typedef T value_type;
+    typedef int* pointer;
+    typedef int* void_pointer;
+    template<class U>
+    struct rebind {
+        typedef A1<U> other;
+    };
+};
+
+template<class T>
+struct A2 {
+    typedef T value_type;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<int*,
+        boost::allocator_void_pointer<A1<char> >::type>));
+    BOOST_TEST_TRAIT_TRUE((boost::core::is_same<void*,
+        boost::allocator_void_pointer<A2<int> >::type>));
+    return boost::report_errors();
+}

test/as_bytes_test.cpp

@@ -0,0 +1,42 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <cstddef>
+#ifdef __cpp_lib_byte
+#include <boost/core/span.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+void test_dynamic()
+{
+    int a[4];
+    boost::span<const std::byte> s =
+        boost::as_bytes(boost::span<int>(&a[0], 4));
+    BOOST_TEST_EQ(s.data(), reinterpret_cast<const std::byte*>(&a[0]));
+    BOOST_TEST_EQ(s.size(), sizeof(int) * 4);
+}
+
+void test_static()
+{
+    int a[4];
+    boost::span<const std::byte, sizeof(int) * 4> s =
+        boost::as_bytes(boost::span<int, 4>(&a[0], 4));
+    BOOST_TEST_EQ(s.data(), reinterpret_cast<const std::byte*>(&a[0]));
+    BOOST_TEST_EQ(s.size(), sizeof(int) * 4);
+}
+
+int main()
+{
+    test_dynamic();
+    test_static();
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif

test/as_writable_bytes_test.cpp

@@ -0,0 +1,42 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <cstddef>
+#ifdef __cpp_lib_byte
+#include <boost/core/span.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+void test_dynamic()
+{
+    int a[4];
+    boost::span<std::byte> s =
+        boost::as_writable_bytes(boost::span<int>(&a[0], 4));
+    BOOST_TEST_EQ(s.data(), reinterpret_cast<std::byte*>(&a[0]));
+    BOOST_TEST_EQ(s.size(), sizeof(int) * 4);
+}
+
+void test_static()
+{
+    int a[4];
+    boost::span<std::byte, sizeof(int) * 4> s =
+        boost::as_writable_bytes(boost::span<int, 4>(&a[0], 4));
+    BOOST_TEST_EQ(s.data(), reinterpret_cast<std::byte*>(&a[0]));
+    BOOST_TEST_EQ(s.size(), sizeof(int) * 4);
+}
+
+int main()
+{
+    test_dynamic();
+    test_static();
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif

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<boost::ulong_long_type>( 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( boost::uint64_t( 1 ) << 63 );
+    }
+
+    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<boost::ulong_long_type>( 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<boost::ulong_long_type>( 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<boost::ulong_long_type>( 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<boost::ulong_long_type>( 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<boost::ulong_long_type>( x ) );
+    }
+
+    return boost::report_errors();
+}

test/bit_endian_test.cpp

@@ -0,0 +1,40 @@
+// 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>
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4127) // conditional expression is constant
+#endif
+
+int main()
+{
+    boost::uint64_t v = ( static_cast<boost::uint64_t>( 0x01020304u ) << 32 ) + 0x05060708u;
+
+    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<boost::ulong_long_type>( 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<boost::ulong_long_type>( 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<boost::ulong_long_type>( 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<boost::ulong_long_type>( x ) );
+    }
+
+    return boost::report_errors();
+}