69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
/*
|
|
* Copyright (C) 2021 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef TNT_UTILS_COMPRESSED_PAIR_H
|
|
#define TNT_UTILS_COMPRESSED_PAIR_H
|
|
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
namespace utils {
|
|
|
|
template<typename T, bool>
|
|
struct dependent_type : public T {
|
|
};
|
|
|
|
template<typename T1, typename T2,
|
|
std::enable_if_t<!std::is_same_v<T1, T2>, bool> = true>
|
|
struct compressed_pair : private T1, private T2 {
|
|
|
|
template<bool Dummy = true, typename = std::enable_if_t<
|
|
dependent_type<std::is_default_constructible<T1>, Dummy>::value &&
|
|
dependent_type<std::is_default_constructible<T2>, Dummy>::value>>
|
|
compressed_pair() : T1(), T2() {}
|
|
|
|
template<typename U1, typename U2>
|
|
compressed_pair(U1&& other1, U2&& other2)
|
|
: T1(std::forward<U1>(other1)),
|
|
T2(std::forward<U2>(other2)) {}
|
|
|
|
T1& first() noexcept {
|
|
return static_cast<T1&>(*this);
|
|
}
|
|
|
|
T2& second() noexcept {
|
|
return static_cast<T2&>(*this);
|
|
}
|
|
|
|
T1 const& first() const noexcept {
|
|
return static_cast<T1 const&>(*this);
|
|
}
|
|
|
|
T2 const& second() const noexcept {
|
|
return static_cast<T2 const&>(*this);
|
|
}
|
|
|
|
void swap(compressed_pair& other) noexcept {
|
|
using std::swap;
|
|
swap(first(), other.first());
|
|
swap(second(), other.second());
|
|
}
|
|
};
|
|
|
|
} // namespace utils
|
|
|
|
#endif //TNT_UTILS_COMPRESSED_PAIR_H
|