Declare_parameter in Dashing

Next Generation ROS
8

From this discussion and some thoughts mulling over in my head, @wjwwood would it be possible to change the get_parameter method to be something like:

returnT get_parameter(args, args, bool declare_parameter=true) {
  if (!has_parameter(...)) {
    declare_parameter(...)
  }

  // normal
  // get_param
  // stuff
}

This way batteries included a get call is going to declare the parameter if not already? If not by default, having the default boolean not do it but have the option? The extra declaration I need to think about makes application-level code a bit less (elegant? readable? can’t think of the right word, but more “overhead stuff” to think about)

More than happy to submit a PR if that’s something agreeable.