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Diffstat (limited to 'third_party/abseil_cpp/absl/types/bad_variant_access.h')
-rw-r--r-- | third_party/abseil_cpp/absl/types/bad_variant_access.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/types/bad_variant_access.h b/third_party/abseil_cpp/absl/types/bad_variant_access.h new file mode 100644 index 000000000000..095969f91eee --- /dev/null +++ b/third_party/abseil_cpp/absl/types/bad_variant_access.h @@ -0,0 +1,82 @@ +// 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_variant_access.h +// ----------------------------------------------------------------------------- +// +// This header file defines the `absl::bad_variant_access` type. + +#ifndef ABSL_TYPES_BAD_VARIANT_ACCESS_H_ +#define ABSL_TYPES_BAD_VARIANT_ACCESS_H_ + +#include <stdexcept> + +#include "absl/base/config.h" + +#ifdef ABSL_USES_STD_VARIANT + +#include <variant> + +namespace absl { +ABSL_NAMESPACE_BEGIN +using std::bad_variant_access; +ABSL_NAMESPACE_END +} // namespace absl + +#else // ABSL_USES_STD_VARIANT + +namespace absl { +ABSL_NAMESPACE_BEGIN + +// ----------------------------------------------------------------------------- +// bad_variant_access +// ----------------------------------------------------------------------------- +// +// An `absl::bad_variant_access` type is an exception type that is thrown in +// the following cases: +// +// * Calling `absl::get(absl::variant) with an index or type that does not +// match the currently selected alternative type +// * Calling `absl::visit on an `absl::variant` that is in the +// `variant::valueless_by_exception` state. +// +// Example: +// +// absl::variant<int, std::string> v; +// v = 1; +// try { +// absl::get<std::string>(v); +// } catch(const absl::bad_variant_access& e) { +// std::cout << "Bad variant access: " << e.what() << '\n'; +// } +class bad_variant_access : public std::exception { + public: + bad_variant_access() noexcept = default; + ~bad_variant_access() override; + const char* what() const noexcept override; +}; + +namespace variant_internal { + +[[noreturn]] void ThrowBadVariantAccess(); +[[noreturn]] void Rethrow(); + +} // namespace variant_internal +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_USES_STD_VARIANT + +#endif // ABSL_TYPES_BAD_VARIANT_ACCESS_H_ |