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// 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 {
using std::bad_optional_access;
} // namespace absl
#else // ABSL_USES_STD_OPTIONAL
namespace absl {
// -----------------------------------------------------------------------------
// 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]] void throw_bad_optional_access();
} // namespace optional_internal
} // namespace absl
#endif // ABSL_USES_STD_OPTIONAL
#endif // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
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