83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// -----------------------------------------------------------------------------
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// bad_variant_access.h
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// -----------------------------------------------------------------------------
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//
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// This header file defines the `absl::bad_variant_access` type.
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#ifndef ABSL_TYPES_BAD_VARIANT_ACCESS_H_
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#define ABSL_TYPES_BAD_VARIANT_ACCESS_H_
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#include <stdexcept>
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#include "absl/base/config.h"
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#ifdef ABSL_USES_STD_VARIANT
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#include <variant>
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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using std::bad_variant_access;
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ABSL_NAMESPACE_END
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} // namespace absl
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#else // ABSL_USES_STD_VARIANT
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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// -----------------------------------------------------------------------------
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// bad_variant_access
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// -----------------------------------------------------------------------------
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//
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// An `absl::bad_variant_access` type is an exception type that is thrown in
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// the following cases:
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//
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// * Calling `absl::get(absl::variant) with an index or type that does not
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// match the currently selected alternative type
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// * Calling `absl::visit on an `absl::variant` that is in the
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// `variant::valueless_by_exception` state.
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//
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// Example:
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//
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// absl::variant<int, std::string> v;
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// v = 1;
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// try {
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// absl::get<std::string>(v);
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// } catch(const absl::bad_variant_access& e) {
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// std::cout << "Bad variant access: " << e.what() << '\n';
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// }
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class bad_variant_access : public std::exception {
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public:
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bad_variant_access() noexcept = default;
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~bad_variant_access() override;
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const char* what() const noexcept override;
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};
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namespace variant_internal {
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[[noreturn]] ABSL_DLL void ThrowBadVariantAccess();
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[[noreturn]] ABSL_DLL void Rethrow();
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} // namespace variant_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_USES_STD_VARIANT
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#endif // ABSL_TYPES_BAD_VARIANT_ACCESS_H_
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