// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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//
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// Copyright (C) 2019 Intel Corporation
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#ifndef OPENCV_GAPI_GASYNC_CONTEXT_HPP
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#define OPENCV_GAPI_GASYNC_CONTEXT_HPP
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#if !defined(GAPI_STANDALONE)
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# include <opencv2/core/cvdef.h>
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#else // Without OpenCV
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# include <opencv2/gapi/own/cvdefs.hpp>
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#endif // !defined(GAPI_STANDALONE)
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#include <opencv2/gapi/own/exports.hpp>
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namespace cv {
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namespace gapi{
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namespace wip {
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/**
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* @brief A class to group async requests to cancel them in a single shot.
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*
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* GAsyncContext is passed as an argument to async() and async_apply() functions
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*/
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class GAPI_EXPORTS GAsyncContext{
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std::atomic<bool> cancelation_requested = {false};
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public:
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/**
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* @brief Start cancellation process for an associated request.
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*
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* User still has to wait for each individual request (either via callback or according std::future object) to make sure it actually canceled.
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*
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* @return true if it was a first request to cancel the context
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*/
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bool cancel();
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/**
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* @brief Returns true if cancellation was requested for this context.
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*
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* @return true if cancellation was requested for this context
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*/
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bool isCanceled() const;
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};
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class GAPI_EXPORTS GAsyncCanceled : public std::exception {
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public:
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virtual const char* what() const noexcept CV_OVERRIDE;
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};
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} // namespace wip
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} // namespace gapi
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} // namespace cv
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#endif //OPENCV_GAPI_GASYNC_CONTEXT_HPP
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