diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..37dadbe
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,425 @@
+# Copyright 2020 Evan Miller
+# Copyright 2020 Matt Borland
+# Copyright 2021 John Maddock
+# 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:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+  release:
+    types: [published, created, edited]
+jobs:
+  ubuntu-focal:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [ g++-9, g++-10, clang++-9, clang++-10 ]
+        standard: [ c++03, c++11, c++14, c++17, c++2a, gnu++03, gnu++11, gnu++14, gnu++17, gnu++2a ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Set TOOLSET
+        run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
+      - name: Add repository
+        continue-on-error: true
+        id: addrepo
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo
+        continue-on-error: true
+        id: retry1
+        if: steps.addrepo.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo 2
+        continue-on-error: true
+        id: retry2
+        if: steps.retry1.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Install packages
+        run: sudo apt install g++-9 g++-10 clang-9 clang-10 libgmp-dev libmpfr-dev libfftw3-dev
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: ./bootstrap.sh
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: ./b2 headers
+        working-directory: ../boost-root
+      - name: Generate user config
+        run: 'echo "using $TOOLSET : : ${{ matrix.compiler }} : <cxxflags>-std=${{ matrix.standard }} ;" > ~/user-config.jam'
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ../../../b2 config_info_travis_install toolset=$TOOLSET
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: ./config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ../../../b2 toolset=$TOOLSET
+        working-directory: ../boost-root/libs/type_traits/test
+  ubuntu-bionic:
+    runs-on: ubuntu-18.04
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [ g++-7, g++-8, clang++-7, clang++-8 ]
+        standard: [ c++03, c++11, c++14, c++17, gnu++03, gnu++11, gnu++14, gnu++17  ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Set TOOLSET
+        run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
+      - name: Add repository
+        continue-on-error: true
+        id: addrepo
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo
+        continue-on-error: true
+        id: retry1
+        if: steps.addrepo.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo 2
+        continue-on-error: true
+        id: retry2
+        if: steps.retry1.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Install packages
+        run: sudo apt install g++-7 g++-8 clang-7 clang-8 libgmp-dev libmpfr-dev libfftw3-dev
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: ./bootstrap.sh
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: ./b2 headers
+        working-directory: ../boost-root
+      - name: Generate user config
+        run: 'echo "using $TOOLSET : : ${{ matrix.compiler }} : <cxxflags>-std=${{ matrix.standard }} ;" > ~/user-config.jam'
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ../../../b2 config_info_travis_install toolset=$TOOLSET
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: ./config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ../../../b2 toolset=$TOOLSET
+        working-directory: ../boost-root/libs/type_traits/test
+  ubuntu-xenial:
+    runs-on: ubuntu-16.04
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [ g++-5, g++-6, clang++-5.0, clang++-6.0 ]
+        standard: [ c++03, c++11, c++14, c++1z, gnu++03, gnu++11, gnu++14, gnu++1z ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Set TOOLSET
+        run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
+      - name: Add repository
+        continue-on-error: true
+        id: addrepo
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo
+        continue-on-error: true
+        id: retry1
+        if: steps.addrepo.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo 2
+        continue-on-error: true
+        id: retry2
+        if: steps.retry1.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Install packages
+        run: sudo apt install g++-5 g++-6 clang-5.0 clang-6.0 libgmp-dev libmpfr-dev libfftw3-dev
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: ./bootstrap.sh
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: ./b2 headers
+        working-directory: ../boost-root
+      - name: Generate user config
+        run: 'echo "using $TOOLSET : : ${{ matrix.compiler }} : <cxxflags>-std=${{ matrix.standard }} ;" > ~/user-config.jam'
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ../../../b2 config_info_travis_install toolset=$TOOLSET
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: ./config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ../../../b2 toolset=$TOOLSET
+        working-directory: ../boost-root/libs/type_traits/test
+  macos:
+    runs-on: macos-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        toolset: [ clang ]
+        standard: [ "03", 11, 14, 17, 2a ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[linux];[Linux];[LINUX]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: ./bootstrap.sh
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: ./b2 headers
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ../../../b2 config_info_travis_install toolset=${{ matrix.toolset }} cxxstd=${{ matrix.standard }}
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: ./config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ../../../b2 toolset=${{ matrix.toolset }} cxxstd=${{ matrix.standard }}
+        working-directory: ../boost-root/libs/type_traits/test
+  windows_gcc:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: cmd
+    env:
+      ARGS: toolset=${{ matrix.toolset }} address-model=64 cxxstd=${{ matrix.standard }}
+    strategy:
+      fail-fast: false
+      matrix:
+        standard: [ 11, 14, 17 ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[apple];[Apple];[APPLE];[linux];[Linux];[LINUX]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: xcopy /s /e /q %GITHUB_WORKSPACE% libs\type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: bootstrap
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: b2 headers
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ..\..\..\b2 config_info_travis_install cxxstd=${{ matrix.standard }} toolset=gcc
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ..\..\..\b2 --hash cxxstd=${{ matrix.standard }} toolset=gcc
+        working-directory: ../boost-root/libs/type_traits/test
+  windows_msvc_14_0:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: cmd
+    strategy:
+      fail-fast: false
+      matrix:
+        standard: [ 14, 17 ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[apple];[Apple];[APPLE];[linux];[Linux];[LINUX]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: xcopy /s /e /q %GITHUB_WORKSPACE% libs\type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: bootstrap
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: b2 headers
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ..\..\..\b2 config_info_travis_install cxxstd=${{ matrix.standard }} toolset=msvc-14.0
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ..\..\..\b2 --hash cxxstd=${{ matrix.standard }} toolset=msvc-14.0 define=CI_SUPPRESS_KNOWN_ISSUES
+        working-directory: ../boost-root/libs/type_traits/test
+  windows_msvc_14_2:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: cmd
+    strategy:
+      fail-fast: false
+      matrix:
+        standard: [ 14, 17, latest ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[apple];[Apple];[APPLE];[linux];[Linux];[LINUX]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: xcopy /s /e /q %GITHUB_WORKSPACE% libs\type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: bootstrap
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: b2 headers
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ..\..\..\b2 config_info_travis_install cxxstd=${{ matrix.standard }} toolset=msvc-14.2
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ..\..\..\b2 --hash cxxstd=${{ matrix.standard }} toolset=msvc-14.2 define=CI_SUPPRESS_KNOWN_ISSUES
+        working-directory: ../boost-root/libs/type_traits/test
+  windows_msvc_14_2_clr:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: cmd
+    strategy:
+      fail-fast: false
+      matrix:
+        standard: [ 14, 17 ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - uses: mstachniuk/ci-skip@v1
+        with:
+          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[apple];[Apple];[APPLE];[linux];[Linux];[LINUX]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: xcopy /s /e /q %GITHUB_WORKSPACE% libs\type_traits
+        working-directory: ../boost-root
+      - name: Install deps
+        run: python tools/boostdep/depinst/depinst.py type_traits
+        working-directory: ../boost-root
+      - name: Bootstrap
+        run: bootstrap
+        working-directory: ../boost-root
+      - name: Generate headers
+        run: b2 headers
+        working-directory: ../boost-root
+      - name: Config info install
+        run: ..\..\..\b2 config_info_travis_install cxxstd=${{ matrix.standard }} toolset=msvc-14.2 cxxflags=-clr asynch-exceptions=on
+        working-directory: ../boost-root/libs/config/test
+      - name: Config info
+        run: config_info_travis
+        working-directory: ../boost-root/libs/config/test
+      - name: Test
+        run: ..\..\..\b2 --hash cxxstd=${{ matrix.standard }} toolset=msvc-14.2 define=CI_SUPPRESS_KNOWN_ISSUES cxxflags=-clr asynch-exceptions=on
+        working-directory: ../boost-root/libs/type_traits/test
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 85fa40e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,350 +0,0 @@
-# Copyright 2016, 2017 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"
-
-os:
-  - linux
-  - osx
-
-dist : xenial
-
-branches:
-  only:
-    - master
-    - develop
-
-env:
-  matrix:
-    - BOGUS_JOB=true
-
-matrix:
-
-  exclude:
-    - env: BOGUS_JOB=true
-
-  include:
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03
-
-    - os: linux
-      compiler: g++-4.4
-      env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=98,0x
-      dist: trusty
-      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
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - g++-4.6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - g++-4.7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=03,11
-      addons:
-        apt:
-          packages:
-            - g++-4.8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=03,11
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - g++-4.9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=03,11,14
-      addons:
-        apt:
-          packages:
-            - g++-5
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11,14,1z CXXSTD_DIALECT=cxxstd-dialect=gnu
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-7
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      compiler: g++-7
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17 CXXSTD_DIALECT=cxxstd-dialect=gnu
-      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: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17 CXXSTD_DIALECT=cxxstd-dialect=gnu
-      addons:
-        apt:
-          packages:
-            - g++-8
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      dist: xenial
-      compiler: g++-9
-      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - g++-9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      dist: xenial
-      compiler: g++-9
-      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a CXXSTD_DIALECT=cxxstd-dialect=gnu
-      addons:
-        apt:
-          packages:
-            - g++-9
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - clang-3.5
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-3.5
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=03,11
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - clang-3.6
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-3.6
-
-    - os: linux
-      dist: trusty
-      env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-3.7
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.7
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=03,11,14,1z
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - clang-3.8
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-3.8
-
-    - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=03,11,14,1z
-      dist: trusty
-      addons:
-        apt:
-          packages:
-            - clang-3.9
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-3.9
-
-    - 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-xenial-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-xenial-5.0
-
-    - os: linux
-      compiler: clang++-6.0
-      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-6.0
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-6.0
-
-    - os: linux
-      compiler: clang++-7
-      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,1z
-      addons:
-        apt:
-          packages:
-            - clang-7
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-7
-
-    - os: linux
-      compiler: clang++-8
-      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
-      addons:
-        apt:
-          packages:
-            - clang-8
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-8
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode10.1
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode9.4
-      # 9.1 fails some tests that pass on 9.4:
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode9.3
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode9.2
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode9.1
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode8.3
-
-    - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
-      osx_image: xcode7.3
-
-
-install:
-  - cd ..
-  - git clone -b $TRAVIS_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
-  - cd boost-root
-  - git submodule update --init tools/build
-  - git submodule update --init tools/boost_install
-  - git submodule update --init libs/headers
-  - git submodule update --init libs/config
-  - git submodule update --init libs/assert
-  - git submodule update --init libs/bind
-  - git submodule update --init libs/core
-  - git submodule update --init libs/detail
-  - git submodule update --init libs/function
-  - git submodule update --init libs/integer
-  - git submodule update --init libs/move
-  - git submodule update --init libs/mpl
-  - git submodule update --init libs/preprocessor
-  - git submodule update --init libs/static_assert
-  - git submodule update --init libs/throw_exception
-  - git submodule update --init libs/type_index
-  - git submodule update --init libs/utility
-  - cp -r $TRAVIS_BUILD_DIR/* libs/type_traits
-  - ./bootstrap.sh
-  - ./b2 headers
-
-script:
-  - |-
-    echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - IFS=','
-  - for CXXLOCAL in $CXXSTD; do  (cd libs/config/test && ../../../b2 config_info_travis_install toolset=$TOOLSET cxxstd=$CXXLOCAL $CXXSTD_DIALECT && echo With Standard Version $CXXLOCAL && ./config_info_travis && rm ./config_info_travis)  done
-  - unset IFS
-  - ./b2 -j3 libs/type_traits/test toolset=$TOOLSET cxxstd=$CXXSTD $CXXSTD_DIALECT
-
-notifications:
-  email:
-    on_success: always
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index b1c14b2..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,90 +0,0 @@
-# Copyright 2016 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)
-
-version: 1.0.{build}-{branch}
-
-shallow_clone: true
-
-branches:
-  only:
-    - master
-    - develop
-
-platform:
-  - x64
-
-environment:
-  matrix:
-    - ARGS: --toolset=msvc-9.0  address-model=32
-    - ARGS: --toolset=msvc-10.0 address-model=32
-    - ARGS: --toolset=msvc-11.0 address-model=32
-    - ARGS: --toolset=msvc-12.0 address-model=32
-    - ARGS: --toolset=msvc-14.0 address-model=32
-    - ARGS: --toolset=msvc-12.0 address-model=32 cxxflags=-clr asynch-exceptions=on
-    - ARGS: --toolset=msvc-12.0 address-model=32 cxxflags=-arch:IA32
-    - ARGS: --toolset=msvc-14.0 address-model=32 cxxflags=-clr asynch-exceptions=on
-    - ARGS: --toolset=msvc-12.0 address-model=64
-    - ARGS: --toolset=msvc-14.0 address-model=64
-    - ARGS: --toolset=msvc-12.0 address-model=64 cxxflags=-clr asynch-exceptions=on
-    - ARGS: --toolset=msvc-14.0 address-model=64 cxxflags=-clr asynch-exceptions=on
-    - ARGS: --toolset=msvc-14.0 address-model=64 cxxflags=-std:c++latest
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 address-model=64
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 address-model=32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 address-model=32  cxxflags=-arch:IA32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 address-model=64 cxxflags=-std:c++latest
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 cxxstd=17 address-model=64 cxxflags=-clr asynch-exceptions=on
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 cxxstd=17 address-model=32 cxxflags=-clr asynch-exceptions=on
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARGS: --toolset=msvc-14.1 architecture=arm testing.execute=off
-      DISABLE_CONFIG_INFO: "YES"
-    - ARGS: --toolset=gcc address-model=64
-      PATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;%PATH%
-    - ARGS: --toolset=gcc address-model=64 cxxflags=-std=gnu++1z
-      PATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;%PATH%
-    - ARGS: --toolset=gcc address-model=32
-      PATH: C:\mingw-w64\i686-5.3.0-posix-dwarf-rt_v4-rev0\mingw32\bin;%PATH%
-    - ARGS: --toolset=gcc address-model=32 linkflags=-Wl,-allow-multiple-definition
-      PATH: C:\MinGW\bin;%PATH%
-
-
-install:
-  - cd ..
-  - git clone -b %APPVEYOR_REPO_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
-  - cd boost-root
-  - git submodule update --init tools/build
-  - git submodule update --init tools/boost_install
-  - git submodule update --init libs/headers
-  - git submodule update --init libs/config
-  - git submodule update --init libs/assert
-  - git submodule update --init libs/bind
-  - git submodule update --init libs/core
-  - git submodule update --init libs/detail
-  - git submodule update --init libs/function
-  - git submodule update --init libs/integer
-  - git submodule update --init libs/move
-  - git submodule update --init libs/mpl
-  - git submodule update --init libs/preprocessor
-  - git submodule update --init libs/static_assert
-  - git submodule update --init libs/throw_exception
-  - git submodule update --init libs/type_index
-  - git submodule update --init libs/utility
-  - git submodule update --init libs/container_hash
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\type_traits
-  - bootstrap
-  - b2 headers
-
-build: off
-
-test_script:
-  - cd libs\config\test
-  - IF DEFINED DISABLE_CONFIG_INFO (echo skipping config_info build) ELSE (..\..\..\b2 config_info_travis_install %ARGS%)
-  - IF DEFINED DISABLE_CONFIG_INFO (echo skipping config_info printout) ELSE (config_info_travis)
-  - cd ..\..\type_traits\test
-  - ..\..\..\b2 -j3 --hash %ARGS%
diff --git a/include/boost/type_traits/is_convertible.hpp b/include/boost/type_traits/is_convertible.hpp
index 8e73d9b..f873ef6 100644
--- a/include/boost/type_traits/is_convertible.hpp
+++ b/include/boost/type_traits/is_convertible.hpp
@@ -489,7 +489,7 @@ struct is_convertible : public integral_constant<bool, ::boost::detail::is_conve
 template <class From, class To>
 struct is_convertible : public integral_constant<bool, BOOST_IS_CONVERTIBLE(From, To)> 
 {
-#if BOOST_WORKAROUND(BOOST_MSVC, <= 1900)
+#if defined(BOOST_MSVC)
    BOOST_STATIC_ASSERT_MSG(boost::is_complete<From>::value || boost::is_void<From>::value || boost::is_array<From>::value || boost::is_reference<From>::value, "From argument type to is_convertible must be a complete type");
 #endif
 #if defined(__clang__)
diff --git a/test/has_equal_to_test.cpp b/test/has_equal_to_test.cpp
index b3eb4c7..39a7ff2 100644
--- a/test/has_equal_to_test.cpp
+++ b/test/has_equal_to_test.cpp
@@ -223,7 +223,7 @@ void specific() {
    // There are some things that pass that wouldn't otherwise do so:
    auto f = []() {};
    auto f2 = [](double)->int { return 2; };
-#ifndef BOOST_MSVC
+#if !defined(BOOST_MSVC) || (_MSC_FULL_VER >= 192829333)
    TEST_TR(decltype(f), bool, true);
    TEST_TR(decltype(f2), bool, true);
 #else
diff --git a/test/has_not_equal_to_test.cpp b/test/has_not_equal_to_test.cpp
index 0b097cb..ea4a5ad 100644
--- a/test/has_not_equal_to_test.cpp
+++ b/test/has_not_equal_to_test.cpp
@@ -223,7 +223,7 @@ void specific() {
    // There are some things that pass that wouldn't otherwise do so:
    auto f = []() {};
    auto f2 = [](double)->int { return 2; };
-#ifndef BOOST_MSVC
+#if !defined(BOOST_MSVC) || (_MSC_FULL_VER >= 192829333)
    TEST_TR(decltype(f), bool, true);
    TEST_TR(decltype(f2), bool, true);
 #else
diff --git a/test/has_right_shift_test.cpp b/test/has_right_shift_test.cpp
index 9d029b1..b9f864d 100644
--- a/test/has_right_shift_test.cpp
+++ b/test/has_right_shift_test.cpp
@@ -234,7 +234,7 @@ void specific() {
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, char&, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, signed char&, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, unsigned char&, std::istream& >::value), 1);
-#if !(defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 9000))
+#if !(defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 9000)) && !defined(_HAS_CXX20)
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, char*, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, signed char*, std::istream& >::value), 1);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< std::istream, unsigned char*, std::istream& >::value), 1);