mirror of https://gitee.com/bigwinds/arangodb
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Simon Grätzer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_FUTURES_UTILITIES_H
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#define ARANGOD_FUTURES_UTILITIES_H 1
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#include "Futures/Future.h"
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#include "Futures/Unit.h"
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namespace arangodb {
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namespace futures {
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template <class T>
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Future<T> makeFuture(Try<T>&& t) {
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return Future<T>(detail::SharedState<T>::make(std::move(t)));
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}
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Future<Unit> makeFuture() { return Future<Unit>(unit); }
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template <class T>
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Future<typename std::decay<T>::type> makeFuture(T&& t) {
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return makeFuture(Try<typename std::decay<T>::type>(std::forward<T>(t)));
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}
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/// Make a failed Future from an std::exception_ptr.
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template <class T>
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Future<T> makeFuture(std::exception_ptr const& e) {
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return makeFuture(Try<T>(e));
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}
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/// Make a Future from an exception type E that can be passed to
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/// std::make_exception_ptr().
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template <class T, class E>
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typename std::enable_if<std::is_base_of<std::exception, E>::value, Future<T>>::type makeFuture(E const& e) {
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return makeFuture(Try<T>(std::make_exception_ptr<E>(e)));
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}
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// makeFutureWith(Future<T>()) -> Future<T>
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template <typename F, typename R = std::result_of_t<F()>>
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typename std::enable_if<isFuture<R>::value, R>::type makeFutureWith(F&& func) {
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using InnerType = typename isFuture<R>::inner;
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try {
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return std::forward<F>(func)();
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} catch (...) {
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return makeFuture<InnerType>(std::current_exception());
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}
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}
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// makeFutureWith(T()) -> Future<T>
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// makeFutureWith(void()) -> Future<Unit>
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template <typename F, typename R = std::result_of_t<F()>>
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typename std::enable_if<!isFuture<R>::value, Future<R>>::type makeFutureWith(F&& func) {
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return makeFuture<R>(
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makeTryWith([&func]() mutable { return std::forward<F>(func)(); }));
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}
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} // namespace futures
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} // namespace arangodb
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#endif // ARANGOD_FUTURES_UTILITIES_H
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