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