Update contrib/restricted/boost/conversion to 1.79.0

3 files changed, 46 insertions, 19 deletions

diff --git a/contrib/restricted/boost/conversion/README.md b/contrib/restricted/boost/conversion/README.md
index 2cd1b9d49f8..b3a4d4cf346 100644
--- a/contrib/restricted/boost/conversion/README.md
+++ b/contrib/restricted/boost/conversion/README.md
@@ -1,16 +1,15 @@
-# [Boost.Conversion](http://boost.org/libs/conversion)
-Boost.Conversion is one of the [Boost C++ Libraries](http://github.com/boostorg). This library improves program safety and clarity by performing otherwise messy conversions. 
+# [Boost.Conversion](https://boost.org/libs/conversion)
+Boost.Conversion is one of the [Boost C++ Libraries](https://github.com/boostorg). This library improves program safety and clarity by performing otherwise messy conversions. 
 
 ### Test results
 
 @               | Build         | Tests coverage | More info
 ----------------|-------------- | -------------- |-----------
-Develop branch: | [![Build Status](https://travis-ci.org/apolukhin/conversion.svg?branch=develop)](https://travis-ci.org/apolukhin/conversion) [![Build status](https://ci.appveyor.com/api/projects/status/yep84179w535pppg/branch/develop?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/develop) | [![Coverage Status](https://coveralls.io/repos/apolukhin/conversion/badge.png?branch=develop)](https://coveralls.io/r/apolukhin/conversion?branch=develop) | [details...](http://www.boost.org/development/tests/develop/developer/conversion.html)
-Master branch:  | [![Build Status](https://travis-ci.org/apolukhin/conversion.svg?branch=master)](https://travis-ci.org/apolukhin/conversion) [![Build status](https://ci.appveyor.com/api/projects/status/yep84179w535pppg/branch/master?svg=true)](https://ci.appveyor.com/project/apolukhin/conversion/branch/master) | [![Coverage Status](https://coveralls.io/repos/apolukhin/conversion/badge.png?branch=master)](https://coveralls.io/r/apolukhin/conversion?branch=master) | [details...](http://www.boost.org/development/tests/master/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://www.boost.org/development/tests/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)
 
-
-[Open Issues](https://svn.boost.org/trac/boost/query?status=!closed&component=conversion&or&status=!closed&component=lexical_cast)
+[Latest developer documentation](https://www.boost.org/doc/libs/develop/doc/html/conversion.html)
 
 ### License
 
-Distributed under the [Boost Software License, Version 1.0](http://boost.org/LICENSE_1_0.txt).
+Distributed under the [Boost Software License, Version 1.0](https://boost.org/LICENSE_1_0.txt).
diff --git a/contrib/restricted/boost/conversion/include/boost/implicit_cast.hpp b/contrib/restricted/boost/conversion/include/boost/implicit_cast.hpp
index d82db7628ee..09e5f456488 100644
--- a/contrib/restricted/boost/conversion/include/boost/implicit_cast.hpp
+++ b/contrib/restricted/boost/conversion/include/boost/implicit_cast.hpp
@@ -2,8 +2,14 @@
 // 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)
-#ifndef IMPLICIT_CAST_DWA200356_HPP
-# define IMPLICIT_CAST_DWA200356_HPP
+
+#ifndef BOOST_IMPLICIT_CAST_DWA200356_HPP
+#define BOOST_IMPLICIT_CAST_DWA200356_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+# pragma once
+#endif
 
 namespace boost {
 
@@ -22,15 +28,11 @@ template<class T> struct icast_identity
 // The use of identity creates a non-deduced form, so that the
 // explicit template argument must be supplied
 template <typename T>
-inline T implicit_cast (typename boost::detail::icast_identity<T>::type x) {
+BOOST_CONSTEXPR inline T implicit_cast (typename boost::detail::icast_identity<T>::type x) {
     return x;
 }
 
-// incomplete return type now is here
-//template <typename T>
-//void implicit_cast (...);
-
 } // namespace boost
 
 
-#endif // IMPLICIT_CAST_DWA200356_HPP
+#endif // BOOST_IMPLICIT_CAST_DWA200356_HPP
diff --git a/contrib/restricted/boost/conversion/include/boost/polymorphic_cast.hpp b/contrib/restricted/boost/conversion/include/boost/polymorphic_cast.hpp
index 70afa6be2ee..35925060032 100644
--- a/contrib/restricted/boost/conversion/include/boost/polymorphic_cast.hpp
+++ b/contrib/restricted/boost/conversion/include/boost/polymorphic_cast.hpp
@@ -50,14 +50,20 @@
 #define BOOST_POLYMORPHIC_CAST_HPP
 
 # include <boost/config.hpp>
-# include <boost/assert.hpp>
-# include <boost/throw_exception.hpp>
-# include <typeinfo>
 
 #ifdef BOOST_HAS_PRAGMA_ONCE
 #   pragma once
 #endif
 
+# include <boost/assert.hpp>
+# include <boost/core/addressof.hpp>
+# include <boost/core/enable_if.hpp>
+# include <boost/throw_exception.hpp>
+# include <boost/type_traits/is_reference.hpp> 
+# include <boost/type_traits/remove_reference.hpp>
+
+# include <typeinfo>
+
 namespace boost
 {
 //  See the documentation for descriptions of how to choose between
@@ -79,7 +85,7 @@ namespace boost
 
 //  polymorphic_downcast  ----------------------------------------------------//
 
-    //  BOOST_ASSERT() checked polymorphic downcast.  Crosscasts prohibited.
+    //  BOOST_ASSERT() checked raw pointer polymorphic downcast.  Crosscasts prohibited.
 
     //  WARNING: Because this cast uses BOOST_ASSERT(), it violates
     //  the One Definition Rule if used in multiple translation units
@@ -95,6 +101,26 @@ namespace boost
         return static_cast<Target>(x);
     }
 
+    //  BOOST_ASSERT() checked reference polymorphic downcast.  Crosscasts prohibited.
+
+    //  WARNING: Because this cast uses BOOST_ASSERT(), it violates
+    //  the One Definition Rule if used in multiple translation units
+    //  where BOOST_DISABLE_ASSERTS, BOOST_ENABLE_ASSERT_HANDLER
+    //  NDEBUG are defined inconsistently.
+
+    //  Contributed by Julien Delacroix
+
+    template <class Target, class Source>
+    inline typename boost::enable_if_c<
+        boost::is_reference<Target>::value, Target
+    >::type polymorphic_downcast(Source& x)
+    {
+        typedef typename boost::remove_reference<Target>::type* target_pointer_type;
+        return *boost::polymorphic_downcast<target_pointer_type>(
+            boost::addressof(x)
+        );
+    }
+
 } // namespace boost
 
 #endif  // BOOST_POLYMORPHIC_CAST_HPP