folly/folly/futures/Future-pre.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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 { … };

isSemiFuture<SemiFuture<T>>;

template <typename T>
struct isFuture : std::false_type { … };

isFuture<Future<T>>;

template <typename T>
struct isFutureOrSemiFuture : std::false_type { … };

isFutureOrSemiFuture<Try<T>>;

isFutureOrSemiFuture<Future<T>>;

isFutureOrSemiFuture<Future<Try<T>>>;

isFutureOrSemiFuture<SemiFuture<T>>;

isFutureOrSemiFuture<SemiFuture<Try<T>>>;

namespace futures {
namespace detail {

template <typename...>
struct ArgType;

ArgType<Arg, Args...>;

template <>
struct ArgType<> { … };

template <bool isTry_, typename F, typename... Args>
struct argResult { … };

template <typename T, typename F>
struct tryCallableResult { … };

template <typename T, typename F>
struct tryExecutorCallableResult { … };

template <typename T, typename F>
struct valueCallableResult { … };

template <typename T, typename F>
struct valueExecutorCallableResult { … };

class DeferredExecutor;

} // namespace detail
} // namespace futures

class Timekeeper;

} // namespace folly