// 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_GCOMPILED_ASYNC_HPP
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#define OPENCV_GAPI_GCOMPILED_ASYNC_HPP
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#include <future> //for std::future
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#include <exception> //for std::exception_ptr
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#include <functional> //for std::function
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#include <opencv2/gapi/garg.hpp>
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#include <opencv2/gapi/own/exports.hpp>
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namespace cv {
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//fwd declaration
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class GCompiled;
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namespace gapi{
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namespace wip {
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class GAsyncContext;
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/**
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These functions asynchronously (i.e. probably on a separate thread of execution) call GCompiled::operator() member function of their first argument with copies of rest of arguments (except callback) passed in.
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The difference between the function is the way to get the completion notification (via callback or a waiting on std::future object)
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If exception is occurred during execution of apply it is transferred to the callback (via function parameter) or passed to future (and will be thrown on call to std::future::get)
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N.B. :
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Input arguments are copied on call to async function (actually on call to cv::gin) and thus do not have to outlive the actual completion of asynchronous activity.
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While output arguments are "captured" by reference(pointer) and therefore _must_ outlive the asynchronous activity
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(i.e. live at least until callback is called or future is unblocked)
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@param gcmpld Compiled computation (graph) to start asynchronously
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@param callback Callback to be called when execution of gcmpld is done
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@param ins Input parameters for gcmpld
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@param outs Output parameters for gcmpld
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*/
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GAPI_EXPORTS void async(GCompiled& gcmpld, std::function<void(std::exception_ptr)>&& callback, GRunArgs &&ins, GRunArgsP &&outs);
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/** @overload
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@param gcmpld Compiled computation (graph) to run asynchronously
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@param callback Callback to be called when execution of gcmpld is done
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@param ins Input parameters for gcmpld
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@param outs Output parameters for gcmpld
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@param ctx Context this request belongs to
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@see async GAsyncContext
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*/
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GAPI_EXPORTS void async(GCompiled& gcmpld, std::function<void(std::exception_ptr)>&& callback, GRunArgs &&ins, GRunArgsP &&outs, GAsyncContext& ctx);
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/** @overload
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@param gcmpld Compiled computation (graph) to run asynchronously
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@param ins Input parameters for gcmpld
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@param outs Output parameters for gcmpld
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@return std::future<void> object to wait for completion of async operation
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@see async
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*/
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GAPI_EXPORTS std::future<void> async(GCompiled& gcmpld, GRunArgs &&ins, GRunArgsP &&outs);
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/**
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@param gcmpld Compiled computation (graph) to run asynchronously
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@param ins Input parameters for gcmpld
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@param outs Output parameters for gcmpld
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@param ctx Context this request belongs to
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@return std::future<void> object to wait for completion of async operation
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@see async GAsyncContext
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*/
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GAPI_EXPORTS std::future<void> async(GCompiled& gcmpld, GRunArgs &&ins, GRunArgsP &&outs, GAsyncContext& ctx);
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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_GCOMPILED_ASYNC_HPP
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