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include/boost/container_hash/detail/float_functions.hpp  view on Meta::CPAN

// Copyright 2005-2009 Daniel James.
// 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)

#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP)
#define BOOST_FUNCTIONAL_HASH_DETAIL_FLOAT_FUNCTIONS_HPP

#include <boost/config.hpp>
#if defined(BOOST_HAS_PRAGMA_ONCE)
#pragma once
#endif

#include <boost/config/no_tr1/cmath.hpp>

// Set BOOST_HASH_CONFORMANT_FLOATS to 1 for libraries known to have
// sufficiently good floating point support to not require any
// workarounds.
//
// When set to 0, the library tries to automatically
// use the best available implementation. This normally works well, but
// breaks when ambiguities are created by odd namespacing of the functions.
//
// Note that if this is set to 0, the library should still take full
// advantage of the platform's floating point support.

#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif defined(__LIBCOMO__)
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif defined(__STD_RWCOMPILER_H__) || defined(_RWSTD_VER)
// Rogue Wave library:
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif defined(_LIBCPP_VERSION)
// libc++
#   define BOOST_HASH_CONFORMANT_FLOATS 1
#elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
// GNU libstdc++ 3
#   if defined(__GNUC__) && __GNUC__ >= 4
#       define BOOST_HASH_CONFORMANT_FLOATS 1
#   else
#       define BOOST_HASH_CONFORMANT_FLOATS 0
#   endif
#elif defined(__STL_CONFIG_H)
// generic SGI STL
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif defined(__MSL_CPP__)
// MSL standard lib:
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif defined(__IBMCPP__)
// VACPP std lib (probably conformant for much earlier version).
#   if __IBMCPP__ >= 1210
#       define BOOST_HASH_CONFORMANT_FLOATS 1
#   else
#       define BOOST_HASH_CONFORMANT_FLOATS 0
#   endif
#elif defined(MSIPL_COMPILE_H)
// Modena C++ standard library
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER)
// Dinkumware Library (this has to appear after any possible replacement libraries):
#   if _CPPLIB_VER >= 405
#       define BOOST_HASH_CONFORMANT_FLOATS 1
#   else
#       define BOOST_HASH_CONFORMANT_FLOATS 0
#   endif
#else
#   define BOOST_HASH_CONFORMANT_FLOATS 0
#endif

#if BOOST_HASH_CONFORMANT_FLOATS

// The standard library is known to be compliant, so don't use the
// configuration mechanism.

namespace boost {
    namespace hash_detail {
        template <typename Float>
        struct call_ldexp {
            typedef Float float_type;
            inline Float operator()(Float x, int y) const {