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3rdparty/boost_1_81_0/boost/numeric/conversion/cast.hpp 2.08 KB
63e88f80   Hu Chunming   提交三方库
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  //  (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
  //  Use, modification, and distribution is 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)
  
  //  See library home page at http://www.boost.org/libs/numeric/conversion
  //
  // Contact the author at: fernando_cacciola@hotmail.com
  //
  //
  //  Revision History
  //
  //    19 Nov 2001 Syntatic changes as suggested by Darin Adler (Fernando Cacciola)
  //    08 Nov 2001 Fixes to accommodate MSVC (Fernando Cacciola)
  //    04 Nov 2001 Fixes to accommodate gcc2.92 (Fernando Cacciola)
  //    30 Oct 2001 Some fixes suggested by Daryle Walker (Fernando Cacciola)
  //    25 Oct 2001 Initial boostification (Fernando Cacciola)
  //    23 Jan 2004 Inital add to cvs (post review)s
  //    22 Jun 2011 Added support for specializing cast policies via numeric_cast_traits (Brandon Kohn).
  //
  #ifndef BOOST_NUMERIC_CONVERSION_CAST_25OCT2001_HPP
  #define BOOST_NUMERIC_CONVERSION_CAST_25OCT2001_HPP
  
  #include <boost/detail/workaround.hpp>
  
  #if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x582))
  
  #  include<boost/numeric/conversion/detail/old_numeric_cast.hpp>
  
  #else
  
  #include <boost/type.hpp>
  #include <boost/numeric/conversion/converter.hpp>
  #include <boost/numeric/conversion/numeric_cast_traits.hpp>
  
  namespace boost
  {
      template <typename Target, typename Source> 
      inline Target numeric_cast( Source arg )
      {
          typedef numeric::conversion_traits<Target, Source>   conv_traits;
          typedef numeric::numeric_cast_traits<Target, Source> cast_traits;
          typedef boost::numeric::converter
              <
                  Target,
                  Source, 
                  conv_traits,
                  typename cast_traits::overflow_policy, 
                  typename cast_traits::rounding_policy, 
                  boost::numeric::raw_converter< conv_traits >,
                  typename cast_traits::range_checking_policy
              > converter;
          return converter::convert(arg);
      }
      
      using numeric::bad_numeric_cast;
  } // namespace boost
  
  #endif
  
  #endif