Update copyright years

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+        interval: "weekly"

.github/workflows/ci.yml

@@ -17,6 +17,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - toolset: gcc-14  # Do not remove! It is the only toolset that tests CMake tests down below
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-24.04
           - toolset: gcc-12
             cxxstd: "03,11,14,17,2a"
             os: ubuntu-22.04
@@ -31,7 +34,7 @@ jobs:
     runs-on: ${{matrix.os}}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Install packages
         if: matrix.install
@@ -59,8 +62,19 @@ jobs:
           cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
           python tools/boostdep/depinst/depinst.py --include benchmark --include example --include examples --include tools --git_args "--depth 10 --jobs 3" $LIBRARY
           ./bootstrap.sh
-          ./b2 -d0 headers
+          ./b2 -j4 variant=debug tools/inspect
-          ./b2 -j4 variant=debug tools/inspect/build
+
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'gcc-14'}}
+        run: |
+          cd ../boost-root/
+          mkdir __build
+          cd __build
+          cmake -DBUILD_TESTING=1 -DBOOST_INCLUDE_LIBRARIES=conversion -DCMAKE_CXX_COMPILER=g++-14 -DCMAKE_C_COMPILER=gcc-14 ..
+          cmake --build . --target tests
+          ctest --output-on-failure --no-tests=error
+          cd ..
+          rm -rf __build
 
       - name: Run tests
         run: |
@@ -101,19 +115,19 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.2
+          - toolset: msvc-14.3
             cxxstd: "14,17,latest"
             addrmd: 32,64
-            os: windows-2019
+            os: windows-2025
           - toolset: gcc
             cxxstd: "03,11,14,17,2a"
             addrmd: 64
-            os: windows-2019
+            os: windows-2025
 
     runs-on: ${{matrix.os}}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Setup Boost
         shell: cmd
@@ -135,7 +149,21 @@ jobs:
           git submodule update --init tools/boostdep
           python tools/boostdep/depinst/depinst.py --include benchmark --include example --include examples --include tools --git_args "--jobs 3" %LIBRARY%
           cmd /c bootstrap
-          b2 -d0 headers
+
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'msvc-14.3'}}
+        shell: cmd
+        run: |
+          choco install --no-progress ninja
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvarsall.bat" x64
+          cd ../boost-root/
+          mkdir __build
+          cd __build
+          cmake -DBUILD_TESTING=1 -DBOOST_INCLUDE_LIBRARIES=conversion ..
+          cmake --build . --target tests --config Debug
+          ctest --output-on-failure --no-tests=error -C Debug
+          cd ..
+          rm -rf __build
 
       - name: Run tests
         shell: cmd

CMakeLists.txt

@@ -2,7 +2,7 @@
 # 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
 
-cmake_minimum_required( VERSION 3.5...3.20 )
+cmake_minimum_required( VERSION 3.5...4.20 )
 project( boost_conversion VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX )
 
 add_library( boost_conversion INTERFACE )
@@ -14,6 +14,9 @@ target_link_libraries( boost_conversion
     INTERFACE
         Boost::assert
         Boost::config
-        Boost::smart_ptr
         Boost::throw_exception
 )
+
+if(BUILD_TESTING)
+  add_subdirectory(test)
+endif()

README.md

@@ -5,8 +5,8 @@ Boost.Conversion is one of the [Boost C++ Libraries](https://github.com/boostorg
 
 @               | Build         | Tests coverage | More info
 ----------------|-------------- | -------------- |-----------
-Develop branch: | [![CI](https://github.com/boostorg/conversion/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/conversion/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1cky1hrunfa46bdx/branch/develop?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/develop) | [![Coverage Status](https://coveralls.io/repos/github/boostorg/conversion/badge.svg?branch=develop)](https://coveralls.io/github/boostorg/conversion?branch=develop) | [details...](https://www.boost.org/development/tests/develop/developer/conversion.html)
+Develop branch: | [![CI](https://github.com/boostorg/conversion/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/conversion/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1cky1hrunfa46bdx/branch/develop?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/develop) | [![Coverage Status](https://coveralls.io/repos/github/boostorg/conversion/badge.svg?branch=develop)](https://coveralls.io/github/boostorg/conversion?branch=develop) | [details...](https://regression.boost.io/develop/developer/conversion.html)
-Master branch:  | [![CI](https://github.com/boostorg/conversion/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/conversion/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1cky1hrunfa46bdx/branch/master?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/master) | [![Coverage Status](https://coveralls.io/repos/github/boostorg/conversion/badge.svg?branch=master)](https://coveralls.io/github/boostorg/conversion?branch=master) | [details...](https://www.boost.org/development/tests/master/developer/conversion.html)
+Master branch:  | [![CI](https://github.com/boostorg/conversion/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/conversion/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1cky1hrunfa46bdx/branch/master?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/master) | [![Coverage Status](https://coveralls.io/repos/github/boostorg/conversion/badge.svg?branch=master)](https://coveralls.io/github/boostorg/conversion?branch=master) | [details...](https://regression.boost.io/master/developer/conversion.html)
 
 [Latest developer documentation](https://www.boost.org/doc/libs/develop/doc/html/conversion.html)
 

build.jam

@@ -8,7 +8,6 @@ require-b2 5.2 ;
 constant boost_dependencies :
     /boost/assert//boost_assert
     /boost/config//boost_config
-    /boost/smart_ptr//boost_smart_ptr
     /boost/throw_exception//boost_throw_exception ;
 
 project /boost/conversion

doc/conversion.qbk

@@ -1,6 +1,6 @@
 [/
     Copyright 2016 Mikhail Maximov.
-    Copyright Antony Polukhin, 2020-2024.
+    Copyright Antony Polukhin, 2020-2026.
 
     Distributed under the Boost Software License, Version 1.0. (See accompanying
     file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)
@@ -12,7 +12,7 @@
     [id conversion]
     [version 1.7]
     [authors [Stroustrup, Bjarne], [Abrahams, Dave], [Rasin, Boris], [Polukhin, Antony]]
-    [copyright 2001 Beman Dawes, 2014-2024 Antony Polukhin]
+    [copyright 2001 Beman Dawes, 2014-2026 Antony Polukhin]
     [license
         Distributed under the Boost Software License, Version 1.0.
         (See accompanying file LICENSE_1_0.txt or copy at
@@ -150,10 +150,10 @@ This includes C++ built-in pointers, `std::shared_ptr`,
     class Banana : public Fruit {};
 
     // Use one of these:
-    typedef Fruit* FruitPtr;
+    using FruitPtr = Fruit*;
-    typedef std::shared_ptr<Fruit> FruitPtr;
+    using FruitPtr = std::shared_ptr<Fruit>;
-    typedef boost::shared_ptr<Fruit> FruitPtr;
+    using FruitPtr = boost::shared_ptr<Fruit>;
-    typedef boost::intrusive_ptr<Fruit> FruitPtr;
+    using FruitPtr = boost::intrusive_ptr<Fruit>;
 
     void f(FruitPtr fruit) {
       // ... logic which leads us to believe it is a banana
@@ -173,17 +173,17 @@ This includes C++ built-in pointers, `std::shared_ptr`,
     // Throws: std::bad_cast if ( dynamic_cast<Derived>(x) == 0 )
     // Returns: dynamic_cast<Derived>(x)
     template <class Derived, class Base>
-    inline Derived polymorphic_cast(Base* x);
+    constexpr Derived polymorphic_cast(Base* x);
 
     // Effects: assert( dynamic_cast<Derived>(x) == x );
     // Returns: static_cast<Derived>(x)
     template <class Derived, class Base>
-    inline Derived polymorphic_downcast(Base* x);
+    constexpr Derived polymorphic_downcast(Base* x);
 
     // Effects: assert( dynamic_cast<Derived>(&x) == &x );
     // Returns: static_cast<Derived>(x)
     template <class Derived, class Base>
-    inline Derived polymorphic_downcast(Base& x);
+    constexpr Derived polymorphic_downcast(Base& x);
 
     // Throws: std::bad_cast if ( dynamic_pointer_cast<Derived>(x) == 0 )
     // Returns: dynamic_pointer_cast<Derived>(x)

include/boost/implicit_cast.hpp

@@ -17,7 +17,7 @@ namespace detail {
 
 template<class T> struct icast_identity
 {
-    typedef T type;
+    using type = T;
 };
 
 } // namespace detail

include/boost/polymorphic_cast.hpp

@@ -14,7 +14,7 @@
 //  08 Nov 14  Add polymorphic_pointer_downcast (Boris Rasin)
 //  09 Jun 14  "cast.hpp" was renamed to "polymorphic_cast.hpp" and
 //             inclusion of numeric_cast was removed (Antony Polukhin)
-//  23 Jun 05  numeric_cast removed and redirected to the new verion (Fernando Cacciola)
+//  23 Jun 05  numeric_cast removed and redirected to the new version (Fernando Cacciola)
 //  02 Apr 01  Removed BOOST_NO_LIMITS workarounds and included
 //             <boost/limits.hpp> instead (the workaround did not
 //             actually compile when BOOST_NO_LIMITS was defined in
@@ -31,7 +31,7 @@
 //  19 Oct 00  Fix numeric_cast for floating-point types (Dave Abrahams)
 //  15 Jul 00  Suppress numeric_cast warnings for GCC, Borland and MSVC
 //             (Dave Abrahams)
-//  30 Jun 00  More MSVC6 wordarounds.  See comments below.  (Dave Abrahams)
+//  30 Jun 00  More MSVC6 workarounds.  See comments below.  (Dave Abrahams)
 //  28 Jun 00  Removed implicit_cast<>.  See comment below. (Beman Dawes)
 //  27 Jun 00  More MSVC6 workarounds
 //  15 Jun 00  Add workarounds for MSVC6
@@ -62,6 +62,12 @@
 # include <typeinfo>
 # include <type_traits>
 
+#if defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+#define BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST constexpr
+#else
+#define BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST inline
+#endif
+
 namespace boost
 {
 //  See the documentation for descriptions of how to choose between
@@ -74,7 +80,7 @@ namespace boost
     //  section 15.8 exercise 1, page 425.
 
     template <class Target, class Source>
-    inline Target polymorphic_cast(Source* x)
+    BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST Target polymorphic_cast(Source* x)
     {
         Target tmp = dynamic_cast<Target>(x);
         if ( tmp == 0 ) boost::throw_exception( std::bad_cast() );
@@ -93,7 +99,7 @@ namespace boost
     //  Contributed by Dave Abrahams
 
     template <class Target, class Source>
-    inline Target polymorphic_downcast(Source* x)
+    BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST Target polymorphic_downcast(Source* x)
     {
         BOOST_ASSERT( dynamic_cast<Target>(x) == x );  // detect logic error
         return static_cast<Target>(x);
@@ -109,11 +115,11 @@ namespace boost
     //  Contributed by Julien Delacroix
 
     template <class Target, class Source>
-    inline typename std::enable_if<
+    BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST typename std::enable_if<
         std::is_reference<Target>::value, Target
     >::type polymorphic_downcast(Source& x)
     {
-        typedef typename std::remove_reference<Target>::type* target_pointer_type;
+        using target_pointer_type = typename std::remove_reference<Target>::type*;
         return *boost::polymorphic_downcast<target_pointer_type>(
             std::addressof(x)
         );
@@ -121,4 +127,6 @@ namespace boost
 
 } // namespace boost
 
+#undef BOOST_CONVERSION_IMPL_CONSTEXPR_DYN_CAST
+
 #endif  // BOOST_POLYMORPHIC_CAST_HPP

include/boost/polymorphic_pointer_cast.hpp

@@ -1,6 +1,6 @@
 //  boost polymorphic_pointer_cast.hpp header file  ----------------------------------------------//
 //  (C) Copyright Boris Rasin, 2014-2021.
-//  (C) Copyright Antony Polukhin, 2014-2024.
+//  (C) Copyright Antony Polukhin, 2014-2026.
 //  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)

index.html

@@ -3,7 +3,7 @@
  Copyright (c) 2016 Mikhail Maximov
  vigorous.activity at gmail dot com
 
- Copyright (c) Antony Polukhin, 2021-2024
+ Copyright (c) Antony Polukhin, 2021-2026
 
  Distributed under the Boost Software License,
  Version 1.0. (See accompanying file LICENSE_1_0.txt

test/CMakeLists.txt

@@ -0,0 +1,17 @@
+# Copyright  (c) 2016-2026 Antony Polukhin
+# 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(BoostTest OPTIONAL RESULT_VARIABLE HAVE_BOOST_TEST)
+
+if(NOT HAVE_BOOST_TEST)
+  return()
+endif()
+
+set(BOOST_TEST_LINK_LIBRARIES Boost::conversion Boost::core)
+
+boost_test(TYPE run SOURCES cast_test.cpp)
+boost_test(TYPE run SOURCES implicit_cast.cpp)
+boost_test(TYPE compile-fail SOURCES implicit_cast_fail.cpp)
+boost_test(TYPE compile-fail SOURCES implicit_cast_fail2.cpp)
+boost_test(TYPE run SOURCES polymorphic_cast_test.cpp LINK_LIBRARIES Boost::smart_ptr)

test/Jamfile.v2

@@ -26,6 +26,6 @@ test-suite conversion
   : [ run implicit_cast.cpp ]
     [ compile-fail implicit_cast_fail.cpp ]
     [ run cast_test.cpp ]
-    [ run polymorphic_cast_test.cpp ]
+    [ run polymorphic_cast_test.cpp : : : <library>/boost/smart_ptr//boost_smart_ptr ]
     [ compile-fail implicit_cast_fail2.cpp ]
   ;

test/appveyor.yml

@@ -2,7 +2,7 @@
 # subject to 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)
 #
-# Copyright Antony Polukhin, 2016-2024.
+# Copyright Antony Polukhin, 2016-2025.
 
 #
 # See https://svn.boost.org/trac/boost/wiki/TravisCoverals for description of this file

test/cast_test.cpp

@@ -38,6 +38,48 @@ namespace
     };
 }
 
+constexpr bool compile_time_polymorphic_cast_check() {
+#if defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+    Derived derived;
+    Base* base = &derived;
+    return polymorphic_cast<Derived*>(base) != nullptr;
+#endif
+    return true;
+}
+
+static_assert(
+    compile_time_polymorphic_cast_check(),
+    "polymorphic_cast does not work at compile time"
+);
+
+constexpr bool compile_time_polymorphic_downcast_check() {
+#if defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+    Derived derived;
+    Base* base = &derived;
+    return polymorphic_downcast<Derived*>(base) != nullptr;
+#endif
+    return true;
+}
+
+static_assert(
+    compile_time_polymorphic_downcast_check(),
+    "polymorphic_downcast does not work at compile time"
+);
+
+constexpr bool compile_time_polymorphic_downcast2_check() {
+#if defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+    Derived derived;
+    Base& base = derived;
+    Derived& derived_again = polymorphic_downcast<Derived&>(base);
+    (void)derived_again;
+#endif
+    return true;
+}
+
+static_assert(
+    compile_time_polymorphic_downcast2_check(),
+    "polymorphic_downcast does not work at compile time"
+);
 
 int main( int argc, char * argv[] )
 {

test/implicit_cast.cpp

@@ -4,8 +4,9 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/implicit_cast.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <boost/type.hpp>
+
 using boost::implicit_cast;
 using boost::type;
 
@@ -18,8 +19,8 @@ struct foo
     operator long() const { return 0; }
 };
 
-typedef type<long> long_type;
+using long_type = type<long>;
-typedef type<foo> foo_type;
+using foo_type = type<foo>;
 
 int main()
 {