PromiseFuturePair.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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.
 */
 
#ifndef ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_PROMISEFUTUREPAIR_H_
#define ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_PROMISEFUTUREPAIR_H_
 
#include <future>
 
namespace alexaClientSDK {
namespace avsCommon {
namespace utils {
 
template <typename Type>
class PromiseFuturePair {
public:
    PromiseFuturePair() : m_future{m_promise.get_future()} {
    }
 
    void setValue(Type val) {
        m_promise.set_value(val);
    }
 
    bool waitFor(std::chrono::milliseconds timeout) {
        auto future = m_future;
        return future.wait_for(timeout) == std::future_status::ready;
    }
 
    Type getValue() {
        auto future = m_future;
        return future.get();
    }
 
private:
    std::promise<Type> m_promise;
 
    std::shared_future<Type> m_future;
};
 
template <>
class PromiseFuturePair<void> {
public:
    PromiseFuturePair() : m_future{m_promise.get_future()} {
    }
 
    void setValue() {
        m_promise.set_value();
    }
 
    bool waitFor(std::chrono::milliseconds timeout) {
        auto future = m_future;
        return future.wait_for(timeout) == std::future_status::ready;
    }
 
private:
    std::promise<void> m_promise;
 
    std::shared_future<void> m_future;
};
 
}  // namespace utils
}  // namespace avsCommon
}  // namespace alexaClientSDK
 
#endif  // ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_PROMISEFUTUREPAIR_H_