2 * Copyright 2017 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.
22 #include <folly/futures/FutureException.h>
23 #include <folly/futures/detail/Core.h>
28 Promise<T> Promise<T>::makeEmpty() noexcept {
29 return Promise<T>(futures::detail::EmptyConstruct{});
34 : retrieved_(false), core_(new futures::detail::Core<T>()) {}
37 Promise<T>::Promise(Promise<T>&& other) noexcept
38 : retrieved_(other.retrieved_), core_(other.core_) {
39 other.core_ = nullptr;
40 other.retrieved_ = false;
44 Promise<T>& Promise<T>::operator=(Promise<T>&& other) noexcept {
45 std::swap(core_, other.core_);
46 std::swap(retrieved_, other.retrieved_);
51 void Promise<T>::throwIfFulfilled() {
56 throwPromiseAlreadySatisfied();
61 void Promise<T>::throwIfRetrieved() {
63 throwFutureAlreadyRetrieved();
68 Promise<T>::Promise(futures::detail::EmptyConstruct) noexcept
69 : retrieved_(false), core_(nullptr) {}
72 Promise<T>::~Promise() {
77 void Promise<T>::detach() {
80 core_->detachFuture();
82 core_->detachPromise();
88 Future<T> Promise<T>::getFuture() {
91 return Future<T>(core_);
96 typename std::enable_if<std::is_base_of<std::exception, E>::value>::type
97 Promise<T>::setException(E const& e) {
98 setException(make_exception_wrapper<E>(e));
102 void Promise<T>::setException(std::exception_ptr const& ep) {
103 setException(exception_wrapper::from_exception_ptr(ep));
107 void Promise<T>::setException(exception_wrapper ew) {
109 core_->setResult(Try<T>(std::move(ew)));
113 void Promise<T>::setInterruptHandler(
114 std::function<void(exception_wrapper const&)> fn) {
115 core_->setInterruptHandler(std::move(fn));
119 void Promise<T>::setTry(Try<T>&& t) {
121 core_->setResult(std::move(t));
126 void Promise<T>::setValue(M&& v) {
127 static_assert(!std::is_same<T, void>::value,
128 "Use setValue() instead");
130 setTry(Try<T>(std::forward<M>(v)));
135 void Promise<T>::setWith(F&& func) {
137 setTry(makeTryWith(std::forward<F>(func)));
141 bool Promise<T>::isFulfilled() const noexcept {
143 return core_->hasResult();