69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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#ifndef TNT_UTILS_COMPRESSED_PAIR_H
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#define TNT_UTILS_COMPRESSED_PAIR_H
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#include <type_traits>
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#include <utility>
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namespace utils {
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template<typename T, bool>
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struct dependent_type : public T {
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};
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template<typename T1, typename T2,
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std::enable_if_t<!std::is_same_v<T1, T2>, bool> = true>
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struct compressed_pair : private T1, private T2 {
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template<bool Dummy = true, typename = std::enable_if_t<
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dependent_type<std::is_default_constructible<T1>, Dummy>::value &&
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dependent_type<std::is_default_constructible<T2>, Dummy>::value>>
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compressed_pair() : T1(), T2() {}
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template<typename U1, typename U2>
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compressed_pair(U1&& other1, U2&& other2)
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: T1(std::forward<U1>(other1)),
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T2(std::forward<U2>(other2)) {}
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T1& first() noexcept {
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return static_cast<T1&>(*this);
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}
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T2& second() noexcept {
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return static_cast<T2&>(*this);
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}
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T1 const& first() const noexcept {
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return static_cast<T1 const&>(*this);
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}
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T2 const& second() const noexcept {
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return static_cast<T2 const&>(*this);
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}
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void swap(compressed_pair& other) noexcept {
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using std::swap;
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swap(first(), other.first());
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swap(second(), other.second());
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}
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};
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} // namespace utils
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#endif // TNT_UTILS_COMPRESSED_PAIR_H
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