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The purpose of rclcpp::init(argc,argv) in ROS2 with C++ is to initialize the ROS 2 node and its associated context. This function sets up the execution environment and initializes the ROS middleware layer. It takes command-line arguments (argc and argv) and parses them to extract the Node name and other ROS parameters. Once initialized, the ROS 2 node can use the ROS 2 communication services to publish and subscribe to messages, call services, and interact with other nodes in the network.