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47 lines
1.9 KiB
47 lines
1.9 KiB
/****************************************************************************
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Copyright (c) 2022-2023 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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namespace cc {
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/* overloaded is used in ccstd::visit a variant value. For example:
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ccstd::variant<ccstd::monostate, int, bool, float> value;
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ccstd::visit(cc::overloaded{
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[](auto& v) {
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// Do something with v
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},
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[](ccstd::monostate&) {} // Do nothing if value isn't initialized
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}, value);
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*/
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// https://stackoverflow.com/questions/69915380/what-does-templateclass-ts-struct-overloaded-ts-using-tsoperator
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// https://en.cppreference.com/w/cpp/language/class_template_argument_deduction
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template <class... Ts>
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struct overloaded : Ts... { using Ts::operator()...; };
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template <class... Ts>
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overloaded(Ts...) -> overloaded<Ts...>;
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} // namespace cc
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