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https://github.com/VectorCamp/vectorscan.git
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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (c) 2016, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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* \brief Hashing utility functions.
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*/
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#ifndef UTIL_HASH_H
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#define UTIL_HASH_H
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#include <boost/functional/hash/hash_fwd.hpp>
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namespace ue2 {
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namespace hash_detail {
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template<typename T>
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void hash_build(size_t &v, const T &obj) {
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boost::hash_combine(v, obj);
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}
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template<typename T, typename... Args>
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void hash_build(size_t &v, const T &obj, Args&&... args) {
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hash_build(v, obj);
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hash_build(v, args...); // recursive
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}
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} // namespace hash_detail
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/**
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* \brief Computes the combined hash of all its arguments.
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*
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* Simply use:
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*
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* size_t hash = hash_all(a, b, c, d);
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*
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* Where a, b, c and d are hashable.
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*/
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template<typename... Args>
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size_t hash_all(Args&&... args) {
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size_t v = 0;
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hash_detail::hash_build(v, args...);
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return v;
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}
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} // namespace ue2
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#endif // UTIL_HASH_H
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