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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __FENNIX_KERNEL_STD_FUNCTIONAL_H__
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#define __FENNIX_KERNEL_STD_FUNCTIONAL_H__
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#include <types.h>
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#include <assert.h>
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namespace std
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{
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template <typename Key>
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struct hash
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{
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size_t operator()(const Key &key) const
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{
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static_assert(sizeof(size_t) == sizeof(uint64_t)); // size_t and uint64_t must have the same size
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const uint64_t fnv_offset_basis = 14695981039346656037ull;
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const uint64_t fnv_prime = 1099511628211ull;
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const uint8_t *data = reinterpret_cast<const uint8_t *>(&key);
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const size_t size = sizeof(Key);
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uint64_t ret = fnv_offset_basis;
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for (size_t i = 0; i < size; ++i)
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{
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ret ^= static_cast<uint64_t>(data[i]);
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ret *= fnv_prime;
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}
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return static_cast<size_t>(ret);
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}
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};
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}
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#endif // !__FENNIX_KERNEL_STD_FUNCTIONAL_H__
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