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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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namespace arrow {
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namespace internal {
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// ----------------------------------------------------------------------
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// BEGIN Hash utilities from Boost
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namespace detail {
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#if defined(_MSC_VER)
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#define ARROW_HASH_ROTL32(x, r) _rotl(x, r)
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#else
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#define ARROW_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r))
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#endif
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template <typename SizeT>
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inline void hash_combine_impl(SizeT& seed, SizeT value) {
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seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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inline void hash_combine_impl(uint32_t& h1, uint32_t k1) {
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const uint32_t c1 = 0xcc9e2d51;
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const uint32_t c2 = 0x1b873593;
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k1 *= c1;
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k1 = ARROW_HASH_ROTL32(k1, 15);
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k1 *= c2;
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h1 ^= k1;
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h1 = ARROW_HASH_ROTL32(h1, 13);
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h1 = h1 * 5 + 0xe6546b64;
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}
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#undef ARROW_HASH_ROTL32
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} // namespace detail
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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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std::hash<T> hasher;
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return ::arrow::internal::detail::hash_combine_impl(seed, hasher(v));
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}
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// END Hash utilities from Boost
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// ----------------------------------------------------------------------
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} // namespace internal
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} // namespace arrow
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