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/Src/Dependencies/Boost/boost/cast.hpp

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  1//  boost cast.hpp header file  ----------------------------------------------//
  2
  3//  (C) Copyright Kevlin Henney and Dave Abrahams 1999.
  4//  Distributed under the Boost
  5//  Software License, Version 1.0. (See accompanying file
  6//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  7
  8//  See http://www.boost.org/libs/conversion for Documentation.
  9
 10//  Revision History
 11//  23 JUn 05  numeric_cast removed and redirected to the new verion (Fernando Cacciola)
 12//  02 Apr 01  Removed BOOST_NO_LIMITS workarounds and included
 13//             <boost/limits.hpp> instead (the workaround did not
 14//             actually compile when BOOST_NO_LIMITS was defined in
 15//             any case, so we loose nothing). (John Maddock)
 16//  21 Jan 01  Undid a bug I introduced yesterday. numeric_cast<> never
 17//             worked with stock GCC; trying to get it to do that broke
 18//             vc-stlport.
 19//  20 Jan 01  Moved BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS to config.hpp.
 20//             Removed unused BOOST_EXPLICIT_TARGET macro. Moved
 21//             boost::detail::type to boost/type.hpp. Made it compile with
 22//             stock gcc again (Dave Abrahams)
 23//  29 Nov 00  Remove nested namespace cast, cleanup spacing before Formal
 24//             Review (Beman Dawes)
 25//  19 Oct 00  Fix numeric_cast for floating-point types (Dave Abrahams)
 26//  15 Jul 00  Suppress numeric_cast warnings for GCC, Borland and MSVC
 27//             (Dave Abrahams)
 28//  30 Jun 00  More MSVC6 wordarounds.  See comments below.  (Dave Abrahams)
 29//  28 Jun 00  Removed implicit_cast<>.  See comment below. (Beman Dawes)
 30//  27 Jun 00  More MSVC6 workarounds
 31//  15 Jun 00  Add workarounds for MSVC6
 32//   2 Feb 00  Remove bad_numeric_cast ";" syntax error (Doncho Angelov)
 33//  26 Jan 00  Add missing throw() to bad_numeric_cast::what(0 (Adam Levar)
 34//  29 Dec 99  Change using declarations so usages in other namespaces work
 35//             correctly (Dave Abrahams)
 36//  23 Sep 99  Change polymorphic_downcast assert to also detect M.I. errors
 37//             as suggested Darin Adler and improved by Valentin Bonnard.
 38//   2 Sep 99  Remove controversial asserts, simplify, rename.
 39//  30 Aug 99  Move to cast.hpp, replace value_cast with numeric_cast,
 40//             place in nested namespace.
 41//   3 Aug 99  Initial version
 42
 43#ifndef BOOST_CAST_HPP
 44#define BOOST_CAST_HPP
 45
 46# include <boost/config.hpp>
 47# include <boost/assert.hpp>
 48# include <typeinfo>
 49# include <boost/type.hpp>
 50# include <boost/limits.hpp>
 51# include <boost/detail/select_type.hpp>
 52
 53//  It has been demonstrated numerous times that MSVC 6.0 fails silently at link
 54//  time if you use a template function which has template parameters that don't
 55//  appear in the function's argument list.
 56//
 57//  TODO: Add this to config.hpp?
 58# if defined(BOOST_MSVC) && BOOST_MSVC < 1300
 59#  define BOOST_EXPLICIT_DEFAULT_TARGET , ::boost::type<Target>* = 0
 60# else
 61#  define BOOST_EXPLICIT_DEFAULT_TARGET
 62# endif
 63
 64namespace boost
 65{
 66//  See the documentation for descriptions of how to choose between
 67//  static_cast<>, dynamic_cast<>, polymorphic_cast<> and polymorphic_downcast<>
 68
 69//  polymorphic_cast  --------------------------------------------------------//
 70
 71    //  Runtime checked polymorphic downcasts and crosscasts.
 72    //  Suggested in The C++ Programming Language, 3rd Ed, Bjarne Stroustrup,
 73    //  section 15.8 exercise 1, page 425.
 74
 75    template <class Target, class Source>
 76    inline Target polymorphic_cast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
 77    {
 78        Target tmp = dynamic_cast<Target>(x);
 79        if ( tmp == 0 ) throw std::bad_cast();
 80        return tmp;
 81    }
 82
 83//  polymorphic_downcast  ----------------------------------------------------//
 84
 85    //  BOOST_ASSERT() checked polymorphic downcast.  Crosscasts prohibited.
 86
 87    //  WARNING: Because this cast uses BOOST_ASSERT(), it violates
 88    //  the One Definition Rule if used in multiple translation units
 89    //  where BOOST_DISABLE_ASSERTS, BOOST_ENABLE_ASSERT_HANDLER
 90    //  NDEBUG are defined inconsistently.
 91
 92    //  Contributed by Dave Abrahams
 93
 94    template <class Target, class Source>
 95    inline Target polymorphic_downcast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
 96    {
 97        BOOST_ASSERT( dynamic_cast<Target>(x) == x );  // detect logic error
 98        return static_cast<Target>(x);
 99    }
100
101#  undef BOOST_EXPLICIT_DEFAULT_TARGET
102
103} // namespace boost
104
105# include <boost/numeric/conversion/cast.hpp>
106
107#endif  // BOOST_CAST_HPP