view release on metacpan or  search on metacpan

include/boost/numeric/conversion/detail/old_numeric_cast.hpp  view on Meta::CPAN

//  boost cast.hpp header file  ----------------------------------------------//

//  (C) Copyright Kevlin Henney and Dave Abrahams 1999.
//  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
//  02 Jun 14  Remove VC6 workarounds.
//  16 Jul 11  Bugfixes for VC6.
//  23 JUN 05  Code extracted from /boost/cast.hpp into this new header.
//             Keeps this legacy version of numeric_cast<> for old compilers
//             wich can't compile the new version in /boost/numeric/conversion/cast.hpp
//             (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_OLD_NUMERIC_CAST_HPP
#define BOOST_OLD_NUMERIC_CAST_HPP

# include <boost/config.hpp>
# include <cassert>
# include <typeinfo>
# include <boost/type.hpp>
# include <boost/limits.hpp>
# include <boost/numeric/conversion/converter_policies.hpp>

namespace boost
{
  using numeric::bad_numeric_cast;

//  LEGACY numeric_cast [only for some old broken compilers] --------------------------------------//

//  Contributed by Kevlin Henney

//  numeric_cast  ------------------------------------------------------------//

#if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || defined(BOOST_SGI_CPP_LIMITS)

    namespace detail
    {
      template <class T>
      struct signed_numeric_limits : std::numeric_limits<T>
      {
             static inline T min BOOST_PREVENT_MACRO_SUBSTITUTION ()
         {
             return (std::numeric_limits<T>::min)() >= 0
                     // unary minus causes integral promotion, thus the static_cast<>
                     ? static_cast<T>(-(std::numeric_limits<T>::max)())
                     : (std::numeric_limits<T>::min)();
         };
      };

      // Move to namespace boost in utility.hpp?
      template <class T, bool specialized>
      struct fixed_numeric_limits_base
          : public if_true< std::numeric_limits<T>::is_signed >
           ::BOOST_NESTED_TEMPLATE then< signed_numeric_limits<T>,
                            std::numeric_limits<T>
                   >::type
      {};

      template <class T>
      struct fixed_numeric_limits
          : fixed_numeric_limits_base<T,(std::numeric_limits<T>::is_specialized)>
      {};

# ifdef BOOST_HAS_LONG_LONG
      // cover implementations which supply no specialization for long
      // long / unsigned long long. Not intended to be full
      // numeric_limits replacements, but good enough for numeric_cast<>
      template <>
      struct fixed_numeric_limits_base< ::boost::long_long_type, false>