diff options
Diffstat (limited to 'cutl/details/boost/functional/hash/detail/hash_float_generic.hpp')
-rw-r--r-- | cutl/details/boost/functional/hash/detail/hash_float_generic.hpp | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/cutl/details/boost/functional/hash/detail/hash_float_generic.hpp b/cutl/details/boost/functional/hash/detail/hash_float_generic.hpp deleted file mode 100644 index 295b620..0000000 --- a/cutl/details/boost/functional/hash/detail/hash_float_generic.hpp +++ /dev/null @@ -1,91 +0,0 @@ - -// 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) - -// A general purpose hash function for non-zero floating point values. - -#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_GENERIC_HEADER) -#define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_GENERIC_HEADER - -#include <cutl/details/boost/functional/hash/detail/float_functions.hpp> -#include <cutl/details/boost/integer/static_log2.hpp> -#include <cutl/details/boost/functional/hash/detail/limits.hpp> - -#if defined(_MSC_VER) && (_MSC_VER >= 1020) -# 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 - -namespace cutl_details_boost -{ - namespace hash_detail - { - inline void hash_float_combine(std::size_t& seed, std::size_t value) - { - seed ^= value + (seed<<6) + (seed>>2); - } - - template <class T> - inline std::size_t float_hash_impl2(T v) - { - cutl_details_boost::hash_detail::call_frexp<T> frexp; - cutl_details_boost::hash_detail::call_ldexp<T> ldexp; - - int exp = 0; - - v = frexp(v, &exp); - - // A postive value is easier to hash, so combine the - // sign with the exponent and use the absolute value. - if(v < 0) { - v = -v; - exp += limits<T>::max_exponent - - limits<T>::min_exponent; - } - - v = ldexp(v, limits<std::size_t>::digits); - std::size_t seed = static_cast<std::size_t>(v); - v -= static_cast<T>(seed); - - // ceiling(digits(T) * log2(radix(T))/ digits(size_t)) - 1; - std::size_t const length - = (limits<T>::digits * - cutl_details_boost::static_log2<limits<T>::radix>::value - + limits<std::size_t>::digits - 1) - / limits<std::size_t>::digits; - - for(std::size_t i = 0; i != length; ++i) - { - v = ldexp(v, limits<std::size_t>::digits); - std::size_t part = static_cast<std::size_t>(v); - v -= static_cast<T>(part); - hash_float_combine(seed, part); - } - - hash_float_combine(seed, exp); - - return seed; - } - - template <class T> - inline std::size_t float_hash_impl(T v) - { - typedef BOOST_DEDUCED_TYPENAME select_hash_type<T>::type type; - return float_hash_impl2(static_cast<type>(v)); - } - } -} - -#if defined(BOOST_MSVC) -#pragma warning(pop) -#endif - -#endif |