79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// Copyright (C) 2015 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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// http://stackoverflow.com/questions/687490/c0x-how-do-i-expand-a-tuple-into-variadic-template-function-arguments
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// Merci à Ryan "FullMetal Alchemist" Lahfa
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// Merci aussi à Freedom de siteduzero.com
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#include <Nazara/Core/AbstractHash.hpp>
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#include <Nazara/Core/Debug.hpp>
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namespace Nz
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{
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namespace Detail
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{
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// http://www.cppsamples.com/common-tasks/apply-tuple-to-function.html
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template<typename F, typename Tuple, size_t... S>
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auto ApplyImplFunc(F&& fn, Tuple&& t, std::index_sequence<S...>)
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{
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return std::forward<F>(fn)(std::get<S>(std::forward<Tuple>(t))...);
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}
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template<typename O, typename F, typename Tuple, size_t... S>
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auto ApplyImplMethod(O& object, F&& fn, Tuple&& t, std::index_sequence<S...>)
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{
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return (object .* std::forward<F>(fn))(std::get<S>(std::forward<Tuple>(t))...);
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}
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}
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template<typename F, typename Tuple>
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auto Apply(F&& fn, Tuple&& t)
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{
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constexpr std::size_t tSize = std::tuple_size<typename std::remove_reference<Tuple>::type>::value;
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return Detail::ApplyImplFunc(std::forward<F>(fn), std::forward<Tuple>(t), std::make_index_sequence<tSize>());
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}
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template<typename O, typename F, typename Tuple>
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auto Apply(O& object, F&& fn, Tuple&& t)
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{
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constexpr std::size_t tSize = std::tuple_size<typename std::remove_reference<Tuple>::type>::value;
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return Detail::ApplyImplMethod(object, std::forward<F>(fn), std::forward<Tuple>(t), std::make_index_sequence<tSize>());
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}
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template<typename T>
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ByteArray ComputeHash(HashType hash, const T& v)
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{
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return ComputeHash(AbstractHash::Get(hash).get(), v);
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}
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template<typename T>
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ByteArray ComputeHash(AbstractHash* hash, const T& v)
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{
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hash->Begin();
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Hashable<T>()(v, hash);
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return hash->End();
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}
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// Algorithme venant de CityHash par Google
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// http://stackoverflow.com/questions/8513911/how-to-create-a-good-hash-combine-with-64-bit-output-inspired-by-boosthash-co
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template<typename T>
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void HashCombine(std::size_t& seed, const T& v)
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{
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const UInt64 kMul = 0x9ddfea08eb382d69ULL;
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std::hash<T> hasher;
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UInt64 a = (hasher(v) ^ seed) * kMul;
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a ^= (a >> 47);
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UInt64 b = (seed ^ a) * kMul;
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b ^= (b >> 47);
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seed = static_cast<std::size_t>(b * kMul);
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}
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}
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#include <Nazara/Core/DebugOff.hpp>
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