57 lines
1.6 KiB
C++
57 lines
1.6 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/Debug.hpp>
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///TODO: Améliorer l'implémentation de UnpackTuple
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template<unsigned int N>
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struct NzImplTupleUnpack
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{
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template <typename F, typename... ArgsT, typename... Args>
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void operator()(F func, const std::tuple<ArgsT...>& t, Args&... args)
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{
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NzImplTupleUnpack<N-1>()(func, t, std::get<N-1>(t), args...);
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}
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};
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template<>
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struct NzImplTupleUnpack<0>
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{
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template <typename F, typename... ArgsT, typename... Args>
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void operator()(F func, const std::tuple<ArgsT...>&, Args&... args)
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{
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func(args...);
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}
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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 NzHashCombine(std::size_t& seed, const T& v)
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{
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const nzUInt64 kMul = 0x9ddfea08eb382d69ULL;
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std::hash<T> hasher;
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nzUInt64 a = (hasher(v) ^ seed) * kMul;
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a ^= (a >> 47);
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nzUInt64 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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template<typename F, typename... ArgsT>
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void NzUnpackTuple(F func, const std::tuple<ArgsT...>& t)
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{
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NzImplTupleUnpack<sizeof...(ArgsT)>()(func, t);
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}
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#include <Nazara/Core/DebugOff.hpp>
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