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61 lines
2.3 KiB
61 lines
2.3 KiB
/****************************************************************************
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Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#pragma once
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#include <boost/container_hash/hash.hpp>
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#include <string_view>
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// transparent hash
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// see https://stackoverflow.com/questions/20317413/what-are-transparent-comparators
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namespace cc {
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template <class Char>
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struct TransparentStringHash {
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using is_transparent = void;
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using string_view_type = std::basic_string_view<Char>;
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size_t operator()(string_view_type str) const noexcept {
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return boost::hash<string_view_type>{}(str);
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}
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size_t operator()(const Char* str) const noexcept {
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return boost::hash<string_view_type>{}(str);
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}
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template <class Alloc>
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size_t operator()(const std::basic_string<Char, std::char_traits<Char>, Alloc>& str) const noexcept {
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return boost::hash<string_view_type>{}(str);
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}
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};
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template <class Char>
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struct TransparentStringEqual {
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using is_transparent = void;
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using string_view_type = std::basic_string_view<Char>;
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template <class T, class U>
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bool operator()(T&& lhs, U&& rhs) const noexcept {
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return string_view_type{lhs} == string_view_type{rhs};
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}
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};
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} // namespace cc
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