// 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