libcruft-util/hash.hpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
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* Copyright 2010-2019, Danny Robson <danny@nerdcruft.net>
*/
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#pragma once
#include "hash/murmur/murmur2.hpp"
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#include <cstdint>
#include <cstdlib>
namespace cruft::hash {
constexpr std::uint32_t
mix (std::uint32_t a, std::uint32_t b)
{
return murmur2<std::uint32_t>::mix (a, b);
}
constexpr std::uint64_t
mix (std::uint64_t a, std::uint64_t b)
{
return murmur2<std::uint64_t>::mix (a, b);
}
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template <typename ValueT, typename ...ArgsT>
constexpr ValueT
mix (ValueT &&head, ValueT &&tail, ArgsT&&...args)
{
return mix (
mix (
std::forward<ValueT> (head),
std::forward<ValueT> (tail)
),
std::forward<ArgsT> (args)...
);
}
}