--- /dev/null
+// 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_any_cast.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::bad_any_cast` type.
+
+#ifndef ABSL_TYPES_BAD_ANY_CAST_H_
+#define ABSL_TYPES_BAD_ANY_CAST_H_
+
+#include <typeinfo>
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_HAVE_STD_ANY
+
+#include <any>
+
+namespace absl {
+using std::bad_any_cast;
+} // namespace absl
+
+#else // ABSL_HAVE_STD_ANY
+
+namespace absl {
+
+// -----------------------------------------------------------------------------
+// bad_any_cast
+// -----------------------------------------------------------------------------
+//
+// An `absl::bad_any_cast` type is an exception type that is thrown when
+// failing to successfully cast the return value of an `absl::any` object.
+//
+// Example:
+//
+// auto a = absl::any(65);
+// absl::any_cast<int>(a); // 65
+// try {
+// absl::any_cast<char>(a);
+// } catch(const absl::bad_any_cast& e) {
+// std::cout << "Bad any cast: " << e.what() << '\n';
+// }
+class bad_any_cast : public std::bad_cast {
+ public:
+ ~bad_any_cast() override;
+ const char* what() const noexcept override;
+};
+
+namespace any_internal {
+
+[[noreturn]] void ThrowBadAnyCast();
+
+} // namespace any_internal
+} // namespace absl
+
+#endif // ABSL_HAVE_STD_ANY
+
+#endif // ABSL_TYPES_BAD_ANY_CAST_H_