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 //  boost polymorphic_cast.hpp header file  ----------------------------------------------//
 
 //  (C) Copyright Kevlin Henney and Dave Abrahams 1999.
 //  (C) Copyright Boris Rasin 2014.
 //  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.
 
 //  Revision History
 //  10 Nov 14  polymorphic_pointer_downcast moved to a separate header,
 //             minor improvements to stisfy latest Boost coding style
 //  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)
 //  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
 //             any case, so we loose nothing). (John Maddock)
 //  21 Jan 01  Undid a bug I introduced yesterday. numeric_cast<> never
 //             worked with stock GCC; trying to get it to do that broke
 //             vc-stlport.
 //  20 Jan 01  Moved BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS to config.hpp.
 //             Removed unused BOOST_EXPLICIT_TARGET macro. Moved
 //             boost::detail::type to boost/type.hpp. Made it compile with
 //             stock gcc again (Dave Abrahams)
 //  29 Nov 00  Remove nested namespace cast, cleanup spacing before Formal
 //             Review (Beman Dawes)
 //  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)
 //  28 Jun 00  Removed implicit_cast<>.  See comment below. (Beman Dawes)
 //  27 Jun 00  More MSVC6 workarounds
 //  15 Jun 00  Add workarounds for MSVC6
 //   2 Feb 00  Remove bad_numeric_cast ";" syntax error (Doncho Angelov)
 //  26 Jan 00  Add missing throw() to bad_numeric_cast::what(0 (Adam Levar)
 //  29 Dec 99  Change using declarations so usages in other namespaces work
 //             correctly (Dave Abrahams)
 //  23 Sep 99  Change polymorphic_downcast assert to also detect M.I. errors
 //             as suggested Darin Adler and improved by Valentin Bonnard.
 //   2 Sep 99  Remove controversial asserts, simplify, rename.
 //  30 Aug 99  Move to cast.hpp, replace value_cast with numeric_cast,
 //             place in nested namespace.
 //   3 Aug 99  Initial version
 
 #ifndef BOOST_POLYMORPHIC_CAST_HPP
 #define BOOST_POLYMORPHIC_CAST_HPP
 
 #include <boost/config.hpp>
 
 #ifdef BOOST_HAS_PRAGMA_ONCE
 #   pragma once
 #endif
 
 # include <boost/assert.hpp>
 # include <boost/throw_exception.hpp>
 
 # include <memory>  // std::addressof
 # include <typeinfo>
 # include <type_traits>
 
 namespace boost
 {
 //  See the documentation for descriptions of how to choose between
 //  static_cast<>, dynamic_cast<>, polymorphic_cast<> and polymorphic_downcast<>
 
 //  polymorphic_cast  --------------------------------------------------------//
 
     //  Runtime checked polymorphic downcasts and crosscasts.
     //  Suggested in The C++ Programming Language, 3rd Ed, Bjarne Stroustrup,
     //  section 15.8 exercise 1, page 425.
 
     template <class Target, class Source>
     inline Target polymorphic_cast(Source* x)
     {
         Target tmp = dynamic_cast<Target>(x);
         if ( tmp == 0 ) boost::throw_exception( std::bad_cast() );
         return tmp;
     }
 
 //  polymorphic_downcast  ----------------------------------------------------//
 
     //  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
     //  where BOOST_DISABLE_ASSERTS, BOOST_ENABLE_ASSERT_HANDLER
     //  NDEBUG are defined inconsistently.
 
     //  Contributed by Dave Abrahams
 
     template <class Target, class Source>
     inline Target polymorphic_downcast(Source* x)
     {
         BOOST_ASSERT( dynamic_cast<Target>(x) == x );  // detect logic error
         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 std::enable_if<
         std::is_reference<Target>::value, Target
     >::type polymorphic_downcast(Source& x)
     {
         typedef typename std::remove_reference<Target>::type* target_pointer_type;
         return *boost::polymorphic_downcast<target_pointer_type>(
             std::addressof(x)
         );
     }
 
 } // namespace boost
 
 #endif  // BOOST_POLYMORPHIC_CAST_HPP

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