Imported from /home/lorry/working-area/delta_boost-tarball/boost_1_58_0.tar.bz2.HEADboost_1_58_0master

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diff --git a/boost/polymorphic_pointer_cast.hpp b/boost/polymorphic_pointer_cast.hpp
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+//  boost polymorphic_pointer_cast.hpp header file  ----------------------------------------------//
+//  (C) Copyright Boris Rasin and Antony Polukhin 2014-2015.
+//  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)
+
+//  See http://www.boost.org/libs/conversion for Documentation.
+
+#ifndef BOOST_CONVERSION_POLYMORPHIC_POINTER_CAST_HPP
+#define BOOST_CONVERSION_POLYMORPHIC_POINTER_CAST_HPP
+
+# include <boost/config.hpp>
+# include <boost/assert.hpp>
+# include <boost/pointer_cast.hpp>
+# include <boost/throw_exception.hpp>
+# include <boost/utility/declval.hpp>
+# ifdef BOOST_NO_CXX11_DECLTYPE
+#   include <boost/typeof/typeof.hpp>
+# endif
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+namespace boost
+{
+//  See the documentation for descriptions of how to choose between
+//  static_pointer_cast<>, dynamic_pointer_cast<>, polymorphic_pointer_cast<> and polymorphic_pointer_downcast<>
+
+//  polymorphic_pointer_downcast  --------------------------------------------//
+
+    //  BOOST_ASSERT() checked polymorphic downcast.  Crosscasts prohibited.
+    //  Supports any type with static_pointer_cast/dynamic_pointer_cast functions:
+    //  built-in pointers, std::shared_ptr, boost::shared_ptr, boost::intrusive_ptr, etc.
+
+    //  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 Boris Rasin
+
+    namespace detail
+    {
+        template <typename Target, typename Source>
+        struct dynamic_pointer_cast_result
+        {
+#ifdef BOOST_NO_CXX11_DECLTYPE
+            BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, dynamic_pointer_cast<Target>(boost::declval<Source>()))
+            typedef typename nested::type type;
+#else
+            typedef decltype(dynamic_pointer_cast<Target>(boost::declval<Source>())) type;
+#endif
+        };
+    }
+
+    template <typename Target, typename Source>
+    inline typename detail::dynamic_pointer_cast_result<Target, Source>::type
+    polymorphic_pointer_downcast (const Source& x)
+    {
+        BOOST_ASSERT(dynamic_pointer_cast<Target> (x) == x);
+        return static_pointer_cast<Target> (x);
+    }
+
+    template <typename Target, typename Source>
+    inline typename detail::dynamic_pointer_cast_result<Target, Source>::type
+    polymorphic_pointer_cast (const Source& x)
+    {
+        typename detail::dynamic_pointer_cast_result<Target, Source>::type tmp
+            = dynamic_pointer_cast<Target> (x);
+        if ( !tmp ) boost::throw_exception( std::bad_cast() );
+
+        return tmp;
+    }
+
+} // namespace boost
+
+#endif  // BOOST_CONVERSION_POLYMORPHIC_POINTER_CAST_HPP