| |
| // 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 |