1 /*
2  * Copyright (c) Facebook, Inc. and its affiliates.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <exception>
20 #include <typeinfo>
21 
22 #include <folly/CPortability.h>
23 
24 namespace folly {
25 
26 /**
27  * Exception type that is thrown on invalid access of an empty `Poly` object.
28  */
29 struct FOLLY_EXPORT BadPolyAccess : std::exception {
30   BadPolyAccess() = default;
whatBadPolyAccess31   char const* what() const noexcept override { return "BadPolyAccess"; }
32 };
33 
34 /**
35  * Exception type that is thrown when attempting to extract from a `Poly` a
36  * value of the wrong type.
37  */
38 struct FOLLY_EXPORT BadPolyCast : std::bad_cast {
39   BadPolyCast() = default;
whatBadPolyCast40   char const* what() const noexcept override { return "BadPolyCast"; }
41 };
42 
43 } // namespace folly
44