| // This file is part of OpenCV project. | |
| // It is subject to the license terms in the LICENSE file found in the top-level directory | |
| // of this distribution and at http://opencv.org/license.html. | |
| // | |
| // Copyright (C) 2018 Intel Corporation | |
| namespace cv { | |
| // GCall is used to capture details (arguments) passed to operation when the graph is | |
| // constructed. It is, in fact, just a "serialization" of a function call (to some extent). The | |
| // only place where new GCall objects are constructed is KernelName::on(). Note that GCall not | |
| // only stores its input arguments, but also yields operation's pseudo-results to return | |
| // "results". | |
| // GCall arguments are GArgs which can wrap either our special types (like GMat) or other | |
| // stuff user may pass according to operation's signature (opaque to us). | |
| // If a dynamic g-object is wrapped in GArg, it has origin - something where that object comes | |
| // from. It is either another function call (again, a GCall) or nothing (for graph's starting | |
| // points, for example). By using these links, we understand what the flow is and construct the | |
| // real graph. Origin is a node in a graph, represented by GNode. | |
| // When a GCall is created, it instantiates it's appropriate GNode since we need an origin for | |
| // objects we produce with this call. This is what is stored in m_node and then is used in every | |
| // yield() call (the framework calls yield() according to template signature which we strip then | |
| // - aka type erasure). | |
| // Here comes the recursion - GNode knows it is created for GCall, and GCall stores that node | |
| // object as origin for yield(). In order to break it, in GNode's object destructor this m_node | |
| // pointer is reset (note - GCall::Priv remains alive). Now GCall's ownership "moves" to GNode | |
| // and remains there until the API part is destroyed. | |
| class GCall::Priv | |
| { | |
| public: | |
| std::vector<GArg> m_args; | |
| GKernel m_k; | |
| // TODO: Rename to "constructionNode" or smt to reflect its lifetime | |
| GNode m_node; | |
| cv::util::any m_params; | |
| explicit Priv(const GKernel &k); | |
| }; | |
| } | |