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// 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_HASH_FLOAT_HEADER)
#define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/functional/hash/detail/float_functions.hpp>
#include <boost/functional/hash/detail/limits.hpp>
#include <boost/integer/static_log2.hpp>
#include <boost/cstdint.hpp>
#include <boost/assert.hpp>
// Include hash implementation for the current platform.
// Cygwn
#if defined(__CYGWIN__)
# if defined(__i386__) || defined(_M_IX86)
# include <boost/functional/hash/detail/hash_float_x86.hpp>
# else
# include <boost/functional/hash/detail/hash_float_generic.hpp>
# endif
#else
# include <boost/functional/hash/detail/hash_float_generic.hpp>
#endif
// Can we use fpclassify?
// STLport
#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
#define BOOST_HASH_USE_FPCLASSIFY 0
// GNU libstdc++ 3
#elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
# if (defined(__USE_ISOC99) || defined(_GLIBCXX_USE_C99_MATH)) && \
!(defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__))
# define BOOST_HASH_USE_FPCLASSIFY 1
# else
# define BOOST_HASH_USE_FPCLASSIFY 0
# endif
// Everything else
#else
# define BOOST_HASH_USE_FPCLASSIFY 0
#endif
#if BOOST_HASH_USE_FPCLASSIFY
#include <boost/config/no_tr1/cmath.hpp>
namespace boost
{
namespace hash_detail
{
template <class T>
inline std::size_t float_hash_value(T v)
{
using namespace std;
switch (fpclassify(v)) {
case FP_ZERO:
return 0;
case FP_INFINITE:
return (std::size_t)(v > 0 ? -1 : -2);
case FP_NAN:
return (std::size_t)(-3);
case FP_NORMAL:
case FP_SUBNORMAL:
return float_hash_impl(v);
default:
BOOST_ASSERT(0);
return 0;
}
}
}
}
#else // !BOOST_HASH_USE_FPCLASSIFY
namespace boost
{
namespace hash_detail
{
template <class T>
inline std::size_t float_hash_value(T v)
{
return v == 0 ? 0 : float_hash_impl(v);
}
}
}
#endif // BOOST_HASH_USE_FPCLASSIFY
#undef BOOST_HASH_USE_FPCLASSIFY
#endif
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