Function async_pipeline_2

tutorial/T07-MultiPipeline.cpp:26–34

std::future<CStatus>  async_pipeline_2(GPipelinePtr pipeline_2) {
    GElementPtr node2A, node2B, node2C = nullptr;

    pipeline_2->registerGElement<MyNode2>(&node2A, {}, "node2A");
    pipeline_2->registerGElement<MyNode2>(&node2B, {node2A}, "node2B");
    pipeline_2->registerGElement<MyNode2>(&node2C, {node2A}, "node2C");

    return pipeline_2->asyncProcess(3);
}


std::future<CStatus> async_pipeline_3(GPipelinePtr pipeline_3) {