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73 lines
2.6 KiB
73 lines
2.6 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/mp11/algorithm.hpp>
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#include <type_traits>
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#include <utility>
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#include "cocos/base/std/variant.h"
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namespace cc {
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#if defined(_MSC_VER) && (_MSC_VER <= 1920)
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// https://stackoverflow.com/questions/50510122/stdvariant-with-overloaded-lambdas-alternative-with-msvc
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template <class... Ts>
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struct Overloaded {}; // NOLINT
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template <class T0>
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struct Overloaded<T0> : T0 {
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using T0::operator();
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Overloaded(T0 t0) // NOLINT
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: T0(std::move(t0)) {}
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};
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template <class T0, class T1, class... Ts>
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struct Overloaded<T0, T1, Ts...> : T0, Overloaded<T1, Ts...> {
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using T0::operator();
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using Overloaded<T1, Ts...>::operator();
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Overloaded(T0 t0, T1 t1, Ts... ts)
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: T0(std::move(t0)), Overloaded<T1, Ts...>(std::move(t1), std::move(ts)...) {}
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};
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#else
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template <class... Ts>
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struct Overloaded : Ts... {
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using Ts::operator()...;
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};
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template <class... Ts>
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Overloaded(Ts...) -> Overloaded<Ts...>;
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#endif
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template <class... Ts>
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Overloaded<Ts...> overload(Ts&&... ts) {
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return {std::forward<Ts>(ts)...};
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}
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template <typename V>
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auto variantFromIndex(size_t index) -> V { // NOLINT
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return boost::mp11::mp_with_index<boost::mp11::mp_size<V>>(index,
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[](auto i) { return V(ccstd::in_place_index<i>); });
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}
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} // namespace cc
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