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For rclcpp, in #include <utilities.hpp> you have the following two functions that return a std::vector<std::string> with the argv trimmed down of any ROS arguments:

std::vector<std::string>
init_and_remove_ros_arguments(
  int argc,
  char const * const * argv,
  const InitOptions & init_options = InitOptions());

and:

std::vector<std::string>
remove_ros_arguments(int argc, char const * const * argv);

In python rclpy, you have args = rclpy.utilities.remove_ros_args(sys.argv) which does the same thing.