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280 lines
9.1 KiB
280 lines
9.1 KiB
// ----------------------------------------------------------------------
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// Copyright (c) 2016, Steven Gregory Popovitch - greg7mdp@gmail.com
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// All rights reserved.
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//
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// Code derived derived from Boost libraries.
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// Boost software licence reproduced below.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * The name of Steven Gregory Popovitch may not be used to
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// endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ----------------------------------------------------------------------
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// ---------------------------------------------------------------------------
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// Boost Software License - Version 1.0 - August 17th, 2003
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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// ---------------------------------------------------------------------------
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// ----------------------------------------------------------------------
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// H A S H F U N C T I O N S
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// ----------------------------
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//
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// Implements spp::spp_hash() and spp::hash_combine()
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//
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// The exact same code is duplicated in sparsepp.h.
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//
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// WARNING: Any change here has to be duplicated in sparsepp.h.
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// ----------------------------------------------------------------------
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#if !defined(spp_utils_h_guard_)
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#define spp_utils_h_guard_
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#if defined(_MSC_VER)
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#if (_MSC_VER >= 1600 ) // vs2010 (1900 is vs2015)
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#include <functional>
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#define SPP_HASH_CLASS std::hash
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#else
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#include <hash_map>
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#define SPP_HASH_CLASS stdext::hash_compare
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#endif
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#if (_MSC_FULL_VER < 190021730)
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#define SPP_NO_CXX11_NOEXCEPT
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#endif
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#elif defined(__GNUC__)
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#if defined(__GXX_EXPERIMENTAL_CXX0X__) || (__cplusplus >= 201103L)
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#include <functional>
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#define SPP_HASH_CLASS std::hash
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#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) < 40600
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#define SPP_NO_CXX11_NOEXCEPT
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#endif
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#else
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#include <tr1/unordered_map>
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#define SPP_HASH_CLASS std::tr1::hash
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#define SPP_NO_CXX11_NOEXCEPT
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#endif
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#elif defined __clang__
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#include <functional>
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#define SPP_HASH_CLASS std::hash
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#if !__has_feature(cxx_noexcept)
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#define SPP_NO_CXX11_NOEXCEPT
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#endif
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#else
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#include <functional>
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#define SPP_HASH_CLASS std::hash
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#endif
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#ifdef SPP_NO_CXX11_NOEXCEPT
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#define SPP_NOEXCEPT
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#else
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#define SPP_NOEXCEPT noexcept
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#endif
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#define SPP_INLINE
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#ifndef SPP_NAMESPACE
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#define SPP_NAMESPACE spp
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#endif
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namespace SPP_NAMESPACE
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{
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template <class T>
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struct spp_hash
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{
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SPP_INLINE size_t operator()(const T &__v) const SPP_NOEXCEPT
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{
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SPP_HASH_CLASS<T> hasher;
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return hasher(__v);
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}
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};
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template <class T>
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struct spp_hash<T *>
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{
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static size_t spp_log2 (size_t val) SPP_NOEXCEPT
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{
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size_t res = 0;
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while (val > 1)
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{
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val >>= 1;
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res++;
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}
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return res;
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}
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SPP_INLINE size_t operator()(const T *__v) const SPP_NOEXCEPT
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{
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static const size_t shift = spp_log2(1 + sizeof(T));
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return static_cast<size_t>((*(reinterpret_cast<const uintptr_t *>(&__v))) >> shift);
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}
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};
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template <>
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struct spp_hash<bool> : public std::unary_function<bool, size_t>
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{
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SPP_INLINE size_t operator()(bool __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<char> : public std::unary_function<char, size_t>
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{
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SPP_INLINE size_t operator()(char __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<signed char> : public std::unary_function<signed char, size_t>
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{
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SPP_INLINE size_t operator()(signed char __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<unsigned char> : public std::unary_function<unsigned char, size_t>
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{
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SPP_INLINE size_t operator()(unsigned char __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<wchar_t> : public std::unary_function<wchar_t, size_t>
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{
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SPP_INLINE size_t operator()(wchar_t __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<short> : public std::unary_function<short, size_t>
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{
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SPP_INLINE size_t operator()(short __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<unsigned short> : public std::unary_function<unsigned short, size_t>
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{
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SPP_INLINE size_t operator()(unsigned short __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<int> : public std::unary_function<int, size_t>
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{
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SPP_INLINE size_t operator()(int __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<unsigned int> : public std::unary_function<unsigned int, size_t>
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{
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SPP_INLINE size_t operator()(unsigned int __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<long> : public std::unary_function<long, size_t>
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{
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SPP_INLINE size_t operator()(long __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<unsigned long> : public std::unary_function<unsigned long, size_t>
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{
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SPP_INLINE size_t operator()(unsigned long __v) const SPP_NOEXCEPT {return static_cast<size_t>(__v);}
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};
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template <>
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struct spp_hash<float> : public std::unary_function<float, size_t>
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{
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SPP_INLINE size_t operator()(float __v) const SPP_NOEXCEPT
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{
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// -0.0 and 0.0 should return same hash
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uint32_t *as_int = reinterpret_cast<uint32_t *>(&__v);
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return (__v == 0) ? static_cast<size_t>(0) : static_cast<size_t>(*as_int);
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}
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};
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#if 0
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// todo: we should not ignore half of the double => see libcxx/include/functional
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template <>
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struct spp_hash<double> : public std::unary_function<double, size_t>
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{
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SPP_INLINE size_t operator()(double __v) const SPP_NOEXCEPT
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{
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// -0.0 and 0.0 should return same hash
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return (__v == 0) ? (size_t)0 : (size_t)*((uint64_t *)&__v);
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}
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};
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#endif
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template <class T, int sz> struct Combiner
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{
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inline void operator()(T& seed, T value);
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};
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template <class T> struct Combiner<T, 4>
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{
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inline void operator()(T& seed, T value)
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{
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seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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};
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template <class T> struct Combiner<T, 8>
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{
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inline void operator()(T& seed, T value)
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{
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seed ^= value + T(0xc6a4a7935bd1e995) + (seed << 6) + (seed >> 2);
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}
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};
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template <class T>
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inline void hash_combine(std::size_t& seed, T const& v)
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{
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spp::spp_hash<T> hasher;
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Combiner<std::size_t, sizeof(std::size_t)> combiner;
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combiner(seed, hasher(v));
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}
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};
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#endif // spp_utils_h_guard_
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