110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/*
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Copyright (c) 2005-2017 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// must be included outside namespaces.
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#ifndef __TBB_tbb_hash_compare_impl_H
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#define __TBB_tbb_hash_compare_impl_H
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#include <string>
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namespace tbb {
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namespace interface5 {
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namespace internal {
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// Template class for hash compare
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template<typename Key, typename Hasher, typename Key_equality>
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class hash_compare
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{
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public:
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typedef Hasher hasher;
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typedef Key_equality key_equal;
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hash_compare() {}
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hash_compare(Hasher a_hasher) : my_hash_object(a_hasher) {}
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hash_compare(Hasher a_hasher, Key_equality a_keyeq) : my_hash_object(a_hasher), my_key_compare_object(a_keyeq) {}
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size_t operator()(const Key& key) const {
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return ((size_t)my_hash_object(key));
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}
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bool operator()(const Key& key1, const Key& key2) const {
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// TODO: get rid of the result invertion
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return (!my_key_compare_object(key1, key2));
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}
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Hasher my_hash_object; // The hash object
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Key_equality my_key_compare_object; // The equality comparator object
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};
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//! Hash multiplier
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static const size_t hash_multiplier = tbb::internal::select_size_t_constant<2654435769U, 11400714819323198485ULL>::value;
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} // namespace internal
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//! Hasher functions
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template<typename T>
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inline size_t tbb_hasher( const T& t ) {
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return static_cast<size_t>( t ) * internal::hash_multiplier;
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}
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template<typename P>
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inline size_t tbb_hasher( P* ptr ) {
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size_t const h = reinterpret_cast<size_t>( ptr );
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return (h >> 3) ^ h;
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}
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template<typename E, typename S, typename A>
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inline size_t tbb_hasher( const std::basic_string<E,S,A>& s ) {
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size_t h = 0;
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for( const E* c = s.c_str(); *c; ++c )
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h = static_cast<size_t>(*c) ^ (h * internal::hash_multiplier);
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return h;
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}
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template<typename F, typename S>
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inline size_t tbb_hasher( const std::pair<F,S>& p ) {
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return tbb_hasher(p.first) ^ tbb_hasher(p.second);
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}
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} // namespace interface5
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using interface5::tbb_hasher;
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// Template class for hash compare
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template<typename Key>
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class tbb_hash
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{
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public:
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tbb_hash() {}
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size_t operator()(const Key& key) const
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{
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return tbb_hasher(key);
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}
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};
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//! hash_compare that is default argument for concurrent_hash_map
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template<typename Key>
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struct tbb_hash_compare {
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static size_t hash( const Key& a ) { return tbb_hasher(a); }
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static bool equal( const Key& a, const Key& b ) { return a == b; }
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};
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} // namespace tbb
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#endif /* __TBB_tbb_hash_compare_impl_H */
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