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- /*
- * Copyright 2015-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #pragma once
- // included by Future.h, do not include directly.
- namespace folly {
- template <class>
- class Promise;
- template <class T>
- class SemiFuture;
- template <typename T>
- struct isSemiFuture : std::false_type {
- using Inner = typename lift_unit<T>::type;
- };
- template <typename T>
- struct isSemiFuture<SemiFuture<T>> : std::true_type {
- typedef T Inner;
- };
- template <typename T>
- struct isFuture : std::false_type {
- using Inner = typename lift_unit<T>::type;
- };
- template <typename T>
- struct isFuture<Future<T>> : std::true_type {
- typedef T Inner;
- };
- template <typename T>
- struct isFutureOrSemiFuture : std::false_type {
- using Inner = typename lift_unit<T>::type;
- using Return = Inner;
- };
- template <typename T>
- struct isFutureOrSemiFuture<Future<T>> : std::true_type {
- typedef T Inner;
- using Return = Future<Inner>;
- };
- template <typename T>
- struct isFutureOrSemiFuture<SemiFuture<T>> : std::true_type {
- typedef T Inner;
- using Return = SemiFuture<Inner>;
- };
- template <typename T>
- struct isTry : std::false_type {};
- template <typename T>
- struct isTry<Try<T>> : std::true_type {};
- namespace futures {
- namespace detail {
- template <class>
- class Core;
- template <typename...>
- struct ArgType;
- template <typename Arg, typename... Args>
- struct ArgType<Arg, Args...> {
- typedef Arg FirstArg;
- };
- template <>
- struct ArgType<> {
- typedef void FirstArg;
- };
- template <bool isTry_, typename F, typename... Args>
- struct argResult {
- using Function = F;
- using ArgList = ArgType<Args...>;
- using Result = invoke_result_t<F, Args...>;
- using ArgsSize = index_constant<sizeof...(Args)>;
- static constexpr bool isTry() {
- return isTry_;
- }
- };
- template <typename T, typename F>
- struct callableResult {
- typedef typename std::conditional<
- is_invocable<F>::value,
- detail::argResult<false, F>,
- typename std::conditional<
- is_invocable<F, T&&>::value,
- detail::argResult<false, F, T&&>,
- detail::argResult<true, F, Try<T>&&>>::type>::type Arg;
- typedef isFutureOrSemiFuture<typename Arg::Result> ReturnsFuture;
- typedef Future<typename ReturnsFuture::Inner> Return;
- };
- template <typename T, typename F>
- struct tryCallableResult {
- typedef detail::argResult<true, F, Try<T>&&> Arg;
- typedef isFutureOrSemiFuture<typename Arg::Result> ReturnsFuture;
- typedef typename ReturnsFuture::Inner value_type;
- typedef Future<value_type> Return;
- };
- template <typename T, typename F>
- struct valueCallableResult {
- typedef detail::argResult<false, F, T&&> Arg;
- typedef isFutureOrSemiFuture<typename Arg::Result> ReturnsFuture;
- typedef typename ReturnsFuture::Inner value_type;
- typedef typename Arg::ArgList::FirstArg FirstArg;
- typedef Future<value_type> Return;
- };
- template <typename L>
- struct Extract : Extract<decltype(&L::operator())> {};
- template <typename Class, typename R, typename... Args>
- struct Extract<R (Class::*)(Args...) const> {
- typedef isFutureOrSemiFuture<R> ReturnsFuture;
- typedef Future<typename ReturnsFuture::Inner> Return;
- typedef typename ReturnsFuture::Inner RawReturn;
- typedef typename ArgType<Args...>::FirstArg FirstArg;
- };
- template <typename Class, typename R, typename... Args>
- struct Extract<R (Class::*)(Args...)> {
- typedef isFutureOrSemiFuture<R> ReturnsFuture;
- typedef Future<typename ReturnsFuture::Inner> Return;
- typedef typename ReturnsFuture::Inner RawReturn;
- typedef typename ArgType<Args...>::FirstArg FirstArg;
- };
- template <typename R, typename... Args>
- struct Extract<R (*)(Args...)> {
- typedef isFutureOrSemiFuture<R> ReturnsFuture;
- typedef Future<typename ReturnsFuture::Inner> Return;
- typedef typename ReturnsFuture::Inner RawReturn;
- typedef typename ArgType<Args...>::FirstArg FirstArg;
- };
- template <typename R, typename... Args>
- struct Extract<R (&)(Args...)> {
- typedef isFutureOrSemiFuture<R> ReturnsFuture;
- typedef Future<typename ReturnsFuture::Inner> Return;
- typedef typename ReturnsFuture::Inner RawReturn;
- typedef typename ArgType<Args...>::FirstArg FirstArg;
- };
- class DeferredExecutor;
- } // namespace detail
- } // namespace futures
- class Timekeeper;
- } // namespace folly
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