1 | |
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2 | // Copyright 2005-2009 Daniel James. |
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3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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5 | |
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6 | #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER) |
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7 | #define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER |
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8 | |
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9 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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10 | # pragma once |
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11 | #endif |
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12 | |
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13 | #include <boost/config.hpp> |
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14 | #include <boost/functional/hash/detail/float_functions.hpp> |
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15 | #include <boost/functional/hash/detail/limits.hpp> |
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16 | #include <boost/integer/static_log2.hpp> |
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17 | #include <boost/cstdint.hpp> |
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18 | #include <boost/assert.hpp> |
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19 | |
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20 | // Include hash implementation for the current platform. |
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21 | |
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22 | // Cygwn |
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23 | #if defined(__CYGWIN__) |
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24 | # if defined(__i386__) || defined(_M_IX86) |
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25 | # include <boost/functional/hash/detail/hash_float_x86.hpp> |
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26 | # else |
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27 | # include <boost/functional/hash/detail/hash_float_generic.hpp> |
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28 | # endif |
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29 | #else |
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30 | # include <boost/functional/hash/detail/hash_float_generic.hpp> |
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31 | #endif |
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32 | |
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33 | // Can we use fpclassify? |
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34 | |
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35 | // STLport |
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36 | #if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) |
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37 | #define BOOST_HASH_USE_FPCLASSIFY 0 |
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38 | |
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39 | // GNU libstdc++ 3 |
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40 | #elif defined(__GLIBCPP__) || defined(__GLIBCXX__) |
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41 | # if (defined(__USE_ISOC99) || defined(_GLIBCXX_USE_C99_MATH)) && \ |
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42 | !(defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)) |
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43 | # define BOOST_HASH_USE_FPCLASSIFY 1 |
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44 | # else |
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45 | # define BOOST_HASH_USE_FPCLASSIFY 0 |
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46 | # endif |
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47 | |
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48 | // Everything else |
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49 | #else |
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50 | # define BOOST_HASH_USE_FPCLASSIFY 0 |
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51 | #endif |
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52 | |
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53 | #if BOOST_HASH_USE_FPCLASSIFY |
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54 | |
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55 | #include <boost/config/no_tr1/cmath.hpp> |
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56 | |
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57 | namespace boost |
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58 | { |
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59 | namespace hash_detail |
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60 | { |
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61 | template <class T> |
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62 | inline std::size_t float_hash_value(T v) |
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63 | { |
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64 | using namespace std; |
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65 | switch (fpclassify(v)) { |
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66 | case FP_ZERO: |
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67 | return 0; |
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68 | case FP_INFINITE: |
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69 | return (std::size_t)(v > 0 ? -1 : -2); |
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70 | case FP_NAN: |
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71 | return (std::size_t)(-3); |
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72 | case FP_NORMAL: |
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73 | case FP_SUBNORMAL: |
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74 | return float_hash_impl(v); |
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75 | default: |
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76 | BOOST_ASSERT(0); |
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77 | return 0; |
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78 | } |
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79 | } |
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80 | } |
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81 | } |
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82 | |
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83 | #else // !BOOST_HASH_USE_FPCLASSIFY |
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84 | |
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85 | namespace boost |
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86 | { |
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87 | namespace hash_detail |
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88 | { |
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89 | template <class T> |
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90 | inline std::size_t float_hash_value(T v) |
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91 | { |
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92 | return v == 0 ? 0 : float_hash_impl(v); |
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93 | } |
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94 | } |
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95 | } |
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96 | |
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97 | #endif // BOOST_HASH_USE_FPCLASSIFY |
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98 | |
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99 | #undef BOOST_HASH_USE_FPCLASSIFY |
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100 | |
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101 | #endif |
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