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I feel really uncomfortable while reading this question. Because I think it is not the right way to run a launch file. Launch files are designed to run nodes (C++/python). Anyways, I found a similar question #q341272

Below is the answer:

#include <cstdlib>
...
std::system("roslaunch your_package your_node");

Finally, as @Mike Scheutzow said that ROS environment variables must be set up correctly before running the above code. Therefore, please source the setup.bash