| // Copyright 2018 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. |
| // |
| // ----------------------------------------------------------------------------- |
| // bad_optional_access.h |
| // ----------------------------------------------------------------------------- |
| // |
| // This header file defines the `absl::bad_optional_access` type. |
| |
| #ifndef ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |
| #define ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |
| |
| #include <stdexcept> |
| |
| #include "absl/base/config.h" |
| |
| #ifdef ABSL_USES_STD_OPTIONAL |
| |
| #include <optional> |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| using std::bad_optional_access; |
| ABSL_NAMESPACE_END |
| } // namespace absl |
| |
| #else // ABSL_USES_STD_OPTIONAL |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| |
| // ----------------------------------------------------------------------------- |
| // bad_optional_access |
| // ----------------------------------------------------------------------------- |
| // |
| // An `absl::bad_optional_access` type is an exception type that is thrown when |
| // attempting to access an `absl::optional` object that does not contain a |
| // value. |
| // |
| // Example: |
| // |
| // absl::optional<int> o; |
| // |
| // try { |
| // int n = o.value(); |
| // } catch(const absl::bad_optional_access& e) { |
| // std::cout << "Bad optional access: " << e.what() << '\n'; |
| // } |
| class bad_optional_access : public std::exception { |
| public: |
| bad_optional_access() = default; |
| ~bad_optional_access() override; |
| const char* what() const noexcept override; |
| }; |
| |
| namespace optional_internal { |
| |
| // throw delegator |
| [[noreturn]] ABSL_DLL void throw_bad_optional_access(); |
| |
| } // namespace optional_internal |
| ABSL_NAMESPACE_END |
| } // namespace absl |
| |
| #endif // ABSL_USES_STD_OPTIONAL |
| |
| #endif // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |