/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
namespace folly {
template <class T>
-Promise<T>::Promise() : retrieved_(false), core_(new detail::Core<T>())
-{}
+Promise<T> Promise<T>::makeEmpty() noexcept {
+ return Promise<T>(futures::detail::EmptyConstruct{});
+}
+
+template <class T>
+Promise<T>::Promise()
+ : retrieved_(false), core_(new futures::detail::Core<T>()) {}
template <class T>
-Promise<T>::Promise(Promise<T>&& other) : core_(nullptr) {
- *this = std::move(other);
+Promise<T>::Promise(Promise<T>&& other) noexcept
+ : retrieved_(other.retrieved_), core_(other.core_) {
+ other.core_ = nullptr;
+ other.retrieved_ = false;
}
template <class T>
-Promise<T>& Promise<T>::operator=(Promise<T>&& other) {
+Promise<T>& Promise<T>::operator=(Promise<T>&& other) noexcept {
std::swap(core_, other.core_);
std::swap(retrieved_, other.retrieved_);
return *this;
template <class T>
void Promise<T>::throwIfFulfilled() {
- if (!core_)
- throw NoState();
- if (core_->ready())
- throw PromiseAlreadySatisfied();
+ if (!core_) {
+ throwNoState();
+ }
+ if (core_->ready()) {
+ throwPromiseAlreadySatisfied();
+ }
}
template <class T>
void Promise<T>::throwIfRetrieved() {
- if (retrieved_)
- throw FutureAlreadyRetrieved();
+ if (retrieved_) {
+ throwFutureAlreadyRetrieved();
+ }
}
+template <class T>
+Promise<T>::Promise(futures::detail::EmptyConstruct) noexcept
+ : retrieved_(false), core_(nullptr) {}
+
template <class T>
Promise<T>::~Promise() {
detach();
template <class T>
void Promise<T>::detach() {
if (core_) {
- if (!retrieved_)
+ if (!retrieved_) {
core_->detachFuture();
+ }
core_->detachPromise();
core_ = nullptr;
}
template <class T>
void Promise<T>::setException(std::exception_ptr const& ep) {
- try {
- std::rethrow_exception(ep);
- } catch (const std::exception& e) {
- setException(exception_wrapper(std::current_exception(), e));
- } catch (...) {
- setException(exception_wrapper(std::current_exception()));
- }
+ setException(exception_wrapper::from_exception_ptr(ep));
}
template <class T>
}
template <class T>
-void Promise<T>::fulfilTry(Try<T> t) {
+void Promise<T>::setTry(Try<T>&& t) {
throwIfFulfilled();
core_->setResult(std::move(t));
}
static_assert(!std::is_same<T, void>::value,
"Use setValue() instead");
- fulfilTry(Try<T>(std::forward<M>(v)));
+ setTry(Try<T>(std::forward<M>(v)));
}
template <class T>
-void Promise<T>::setValue() {
- static_assert(std::is_same<T, void>::value,
- "Use setValue(value) instead");
-
- fulfilTry(Try<void>());
+template <class F>
+void Promise<T>::setWith(F&& func) {
+ throwIfFulfilled();
+ setTry(makeTryWith(std::forward<F>(func)));
}
template <class T>
-template <class F>
-void Promise<T>::fulfil(F&& func) {
- throwIfFulfilled();
- fulfilTry(makeTryFunction(std::forward<F>(func)));
+bool Promise<T>::isFulfilled() const noexcept {
+ if (core_) {
+ return core_->hasResult();
+ }
+ return true;
}
}