move futures/ScheduledExecutor to executors/ScheduledExecutor

[folly.git] / folly / futures / Promise-inl.h

diff --git a/folly/futures/Promise-inl.h b/folly/futures/Promise-inl.h
index 6f5a7d1a5a141f3645f44d6aa0b36d6cb5edbf6e..5fe4ed2cb029c782c39e3f54ac9fa2fdb0fc2222 100644 (file)
--- a/folly/futures/Promise-inl.h
+++ b/folly/futures/Promise-inl.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 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.
@@ -25,8 +25,13 @@
 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) noexcept
@@ -44,18 +49,25 @@ Promise<T>& Promise<T>::operator=(Promise<T>&& other) noexcept {
 
 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();
@@ -87,13 +99,7 @@ Promise<T>::setException(E const& e) {
 
 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>
@@ -109,7 +115,7 @@ void Promise<T>::setInterruptHandler(
 }
 
 template <class T>
-void Promise<T>::setTry(Try<T> t) {
+void Promise<T>::setTry(Try<T>&& t) {
   throwIfFulfilled();
   core_->setResult(std::move(t));
 }
@@ -123,19 +129,19 @@ void Promise<T>::setValue(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");
-
-  setTry(Try<void>());
-}
-
 template <class T>
 template <class F>
 void Promise<T>::setWith(F&& func) {
   throwIfFulfilled();
-  setTry(makeTryFunction(std::forward<F>(func)));
+  setTry(makeTryWith(std::forward<F>(func)));
+}
+
+template <class T>
+bool Promise<T>::isFulfilled() const noexcept {
+  if (core_) {
+    return core_->hasResult();
+  }
+  return true;
 }
 
 }