bad_optional_access.h
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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_optional_access.h
17 // -----------------------------------------------------------------------------
18 //
19 // This header file defines the `absl::bad_optional_access` type.
20 
21 #ifndef ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
22 #define ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
23 
24 #include <stdexcept>
25 
26 #include "absl/base/config.h"
27 
28 #ifdef ABSL_HAVE_STD_OPTIONAL
29 
30 #include <optional>
31 
32 namespace absl {
33 using std::bad_optional_access;
34 } // namespace absl
35 
36 #else // ABSL_HAVE_STD_OPTIONAL
37 
38 namespace absl {
39 
40 // -----------------------------------------------------------------------------
41 // bad_optional_access
42 // -----------------------------------------------------------------------------
43 //
44 // An `absl::bad_optional_access` type is an exception type that is thrown when
45 // attempting to access an `absl::optional` object that does not contain a
46 // value.
47 //
48 // Example:
49 //
50 // absl::optional<int> o;
51 //
52 // try {
53 // int n = o.value();
54 // } catch(const absl::bad_optional_access& e) {
55 // std::cout << "Bad optional access: " << e.what() << '\n';
56 // }
57 class bad_optional_access : public std::exception {
58  public:
59  bad_optional_access() = default;
60  ~bad_optional_access() override;
61  const char* what() const noexcept override;
62 };
63 
64 namespace optional_internal {
65 
66 // throw delegator
67 [[noreturn]] void throw_bad_optional_access();
68 
69 } // namespace optional_internal
70 } // namespace absl
71 
72 #endif // ABSL_HAVE_STD_OPTIONAL
73 
74 #endif // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
Definition: algorithm.h:29
const char * what() const noexceptoverride


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autogenerated on Tue Jun 18 2019 19:44:35