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absl/types/optional.h
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29 мар 2025, 01:27
29 мар 2025, 01:27
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// Copyright 2017 The Abseil Authors. // // 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 // // https://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. // // ----------------------------------------------------------------------------- // optional.h // ----------------------------------------------------------------------------- // // Historical note: Abseil once provided an implementation of `absl::optional` // as a polyfill for `std::optional` prior to C++17. Now that C++17 is required, // `absl::optional` is an alias for `std::optional`. #ifndef ABSL_TYPES_OPTIONAL_H_ #define ABSL_TYPES_OPTIONAL_H_ #include <optional> #include "absl/base/config.h" #include "absl/utility/utility.h" namespace absl { ABSL_NAMESPACE_BEGIN using std::bad_optional_access; using std::optional; using std::make_optional; using std::nullopt_t; using std::nullopt; ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_TYPES_OPTIONAL_H_