102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
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// Copyright 2005-2009 Daniel James.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER)
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#define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/functional/hash/detail/float_functions.hpp>
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#include <boost/functional/hash/detail/limits.hpp>
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#include <boost/integer/static_log2.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/assert.hpp>
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// Include hash implementation for the current platform.
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// Cygwn
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#if defined(__CYGWIN__)
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# if defined(__i386__) || defined(_M_IX86)
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# include <boost/functional/hash/detail/hash_float_x86.hpp>
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# else
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# include <boost/functional/hash/detail/hash_float_generic.hpp>
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# endif
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#else
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# include <boost/functional/hash/detail/hash_float_generic.hpp>
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#endif
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// Can we use fpclassify?
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// STLport
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#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
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#define BOOST_HASH_USE_FPCLASSIFY 0
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// GNU libstdc++ 3
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#elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
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# if (defined(__USE_ISOC99) || defined(_GLIBCXX_USE_C99_MATH)) && \
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!(defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__))
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# define BOOST_HASH_USE_FPCLASSIFY 1
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# else
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# define BOOST_HASH_USE_FPCLASSIFY 0
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# endif
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// Everything else
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#else
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# define BOOST_HASH_USE_FPCLASSIFY 0
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#endif
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#if BOOST_HASH_USE_FPCLASSIFY
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#include <boost/config/no_tr1/cmath.hpp>
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namespace boost
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{
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namespace hash_detail
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{
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template <class T>
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inline std::size_t float_hash_value(T v)
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{
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using namespace std;
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switch (fpclassify(v)) {
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case FP_ZERO:
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return 0;
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case FP_INFINITE:
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return (std::size_t)(v > 0 ? -1 : -2);
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case FP_NAN:
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return (std::size_t)(-3);
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case FP_NORMAL:
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case FP_SUBNORMAL:
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return float_hash_impl(v);
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default:
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BOOST_ASSERT(0);
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return 0;
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}
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}
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}
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}
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#else // !BOOST_HASH_USE_FPCLASSIFY
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namespace boost
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{
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namespace hash_detail
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{
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template <class T>
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inline std::size_t float_hash_value(T v)
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{
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return v == 0 ? 0 : float_hash_impl(v);
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}
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}
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}
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#endif // BOOST_HASH_USE_FPCLASSIFY
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#undef BOOST_HASH_USE_FPCLASSIFY
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#endif
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