2 * Copyright 2014 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef FOLLY_EXCEPTIONWRAPPER_H
18 #define FOLLY_EXCEPTIONWRAPPER_H
23 #include "folly/detail/ExceptionWrapper.h"
27 class exception_wrapper {
29 exception_wrapper() : throwfn_(nullptr) { }
31 void throwException() {
33 throwfn_(item_.get());
37 std::exception* get() { return item_.get(); }
38 const std::exception* get() const { return item_.get(); }
40 std::exception* operator->() { return get(); }
41 const std::exception* operator->() const { return get(); }
43 std::exception& operator*() { assert(get()); return *get(); }
44 const std::exception& operator*() const { assert(get()); return *get(); }
46 explicit operator bool() const { return get(); }
49 std::shared_ptr<std::exception> item_;
50 void (*throwfn_)(std::exception*);
52 template <class T, class... Args>
53 friend exception_wrapper make_exception_wrapper(Args&&... args);
56 template <class T, class... Args>
57 exception_wrapper make_exception_wrapper(Args&&... args) {
59 ew.item_ = std::make_shared<T>(std::forward<Args>(args)...);
60 ew.throwfn_ = folly::detail::Thrower<T>::doThrow;