Swiftdiff options
Diffstat (limited to '3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp | 170 |
1 files changed, 37 insertions, 133 deletions
diff --git a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp index 5d5ac34..ea1bc25 100644 --- a/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp +++ b/3rdParty/Boost/src/boost/functional/hash/detail/hash_float.hpp @@ -10,164 +10,57 @@ # pragma once #endif -#if defined(BOOST_MSVC) -#pragma warning(push) -#if BOOST_MSVC >= 1400 -#pragma warning(disable:6294) // Ill-defined for-loop: initial condition does - // not satisfy test. Loop body not executed -#endif -#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/limits.hpp> #include <boost/assert.hpp> -// Select implementation for the current platform. +// Include hash implementation for the current platform. // Cygwn #if defined(__CYGWIN__) # if defined(__i386__) || defined(_M_IX86) -# define BOOST_HASH_USE_x86_BINARY_HASH +# 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 -#elif defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) -// fpclassify aren't good enough on 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 +# define BOOST_HASH_USE_FPCLASSIFY 1 +# else +# define BOOST_HASH_USE_FPCLASSIFY 0 # endif -// Dinkumware Library, on Visual C++ -#elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER) - -// Not using _fpclass because it is only available for double. - +// Everything else +#else +# define BOOST_HASH_USE_FPCLASSIFY 0 #endif -// On OpenBSD, numeric_limits is not reliable for long doubles, but -// the macros defined in <float.h> are. +#if BOOST_HASH_USE_FPCLASSIFY -#if defined(__OpenBSD__) -#include <float.h> -#endif +#include <boost/config/no_tr1/cmath.hpp> namespace boost { namespace hash_detail { template <class T> - struct limits : std::numeric_limits<T> {}; - -#if defined(__OpenBSD__) - template <> - struct limits<long double> - : std::numeric_limits<long double> - { - static long double epsilon() { - return LDBL_EPSILON; - } - - static long double (max)() { - return LDBL_MAX; - } - - static long double (min)() { - return LDBL_MIN; - } - - BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG); - BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP); - BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP); - }; -#endif // __OpenBSD__ - - inline void hash_float_combine(std::size_t& seed, std::size_t value) - { - seed ^= value + (seed<<6) + (seed>>2); - } - -// A simple, non-portable hash algorithm for x86. -#if defined(BOOST_HASH_USE_x86_BINARY_HASH) - inline std::size_t float_hash_impl(float v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr; - return seed; - } - - inline std::size_t float_hash_impl(double v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr++; - hash_float_combine(seed, *ptr); - return seed; - } - - inline std::size_t float_hash_impl(long double v) - { - boost::uint32_t* ptr = (boost::uint32_t*)&v; - std::size_t seed = *ptr++; - hash_float_combine(seed, *ptr++); - hash_float_combine(seed, *(boost::uint16_t*)ptr); - return seed; - } - -#else - - template <class T> - inline std::size_t float_hash_impl(T v) - { - int exp = 0; - - v = boost::hash_detail::call_frexp(v, &exp); - - // A postive value is easier to hash, so combine the - // sign with the exponent. - if(v < 0) { - v = -v; - exp += limits<T>::max_exponent - - limits<T>::min_exponent; - } - - // The result of frexp is always between 0.5 and 1, so its - // top bit will always be 1. Subtract by 0.5 to remove that. - v -= T(0.5); - v = boost::hash_detail::call_ldexp(v, - limits<std::size_t>::digits + 1); - std::size_t seed = static_cast<std::size_t>(v); - v -= seed; - - // ceiling(digits(T) * log2(radix(T))/ digits(size_t)) - 1; - std::size_t const length - = (limits<T>::digits * - boost::static_log2<limits<T>::radix>::value - 1) - / limits<std::size_t>::digits; - - for(std::size_t i = 0; i != length; ++i) - { - v = boost::hash_detail::call_ldexp(v, - limits<std::size_t>::digits); - std::size_t part = static_cast<std::size_t>(v); - v -= part; - hash_float_combine(seed, part); - } - - hash_float_combine(seed, exp); - - return seed; - } -#endif - - template <class T> inline std::size_t float_hash_value(T v) { -#if defined(BOOST_HASH_USE_FPCLASSIFY) using namespace std; switch (fpclassify(v)) { case FP_ZERO: @@ -183,15 +76,26 @@ namespace boost BOOST_ASSERT(0); return 0; } -#else + } + } +} + +#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 } } } -#if defined(BOOST_MSVC) -#pragma warning(pop) -#endif +#endif // BOOST_HASH_USE_FPCLASSIFY + +#undef BOOST_HASH_USE_FPCLASSIFY #endif |