| 1 | // Copyright 2018 The Abseil Authors. |
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| 2 | // |
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| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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| 4 | // you may not use this file except in compliance with the License. |
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| 5 | // You may obtain a copy of the License at |
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| 6 | // |
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| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
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| 8 | // |
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| 9 | // Unless required by applicable law or agreed to in writing, software |
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| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 12 | // See the License for the specific language governing permissions and |
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| 13 | // limitations under the License. |
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| 14 | // |
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| 15 | // ----------------------------------------------------------------------------- |
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| 16 | // bad_optional_access.h |
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| 17 | // ----------------------------------------------------------------------------- |
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| 18 | // |
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| 19 | // This header file defines the `absl::bad_optional_access` type. |
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| 20 | |
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| 21 | #ifndef ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |
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| 22 | #define ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |
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| 23 | |
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| 24 | #include <stdexcept> |
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| 25 | |
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| 26 | #include "absl/base/config.h" |
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| 27 | |
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| 28 | #ifdef ABSL_USES_STD_OPTIONAL |
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| 29 | |
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| 30 | #include <optional> |
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| 31 | |
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| 32 | namespace absl { |
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| 33 | ABSL_NAMESPACE_BEGIN |
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| 34 | using std::bad_optional_access; |
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| 35 | ABSL_NAMESPACE_END |
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| 36 | } // namespace absl |
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| 37 | |
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| 38 | #else // ABSL_USES_STD_OPTIONAL |
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| 39 | |
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| 40 | namespace absl { |
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| 41 | ABSL_NAMESPACE_BEGIN |
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| 42 | |
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| 43 | // ----------------------------------------------------------------------------- |
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| 44 | // bad_optional_access |
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| 45 | // ----------------------------------------------------------------------------- |
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| 46 | // |
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| 47 | // An `absl::bad_optional_access` type is an exception type that is thrown when |
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| 48 | // attempting to access an `absl::optional` object that does not contain a |
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| 49 | // value. |
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| 50 | // |
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| 51 | // Example: |
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| 52 | // |
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| 53 | // absl::optional<int> o; |
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| 54 | // |
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| 55 | // try { |
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| 56 | // int n = o.value(); |
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| 57 | // } catch(const absl::bad_optional_access& e) { |
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| 58 | // std::cout << "Bad optional access: " << e.what() << '\n'; |
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| 59 | // } |
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| 60 | class bad_optional_access : public std::exception { |
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| 61 | public: |
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| 62 | bad_optional_access() = default; |
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| 63 | ~bad_optional_access() override; |
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| 64 | const char* what() const noexcept override; |
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| 65 | }; |
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| 66 | |
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| 67 | namespace optional_internal { |
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| 68 | |
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| 69 | // throw delegator |
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| 70 | [[noreturn]] ABSL_DLL void throw_bad_optional_access(); |
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| 71 | |
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| 72 | } // namespace optional_internal |
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| 73 | ABSL_NAMESPACE_END |
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| 74 | } // namespace absl |
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| 75 | |
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| 76 | #endif // ABSL_USES_STD_OPTIONAL |
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| 77 | |
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| 78 | #endif // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_ |
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| 79 | |
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