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Both versions call the same templated method in nh. For the first version, the c++ compiler will guess the typename by looking at the types of the 2nd and 3rd arguments.

Both versions call the same templated method in nh. For the first version, the c++ compiler will guess the typename by looking at the types of the 2nd and 3rd arguments.

P.S. Unrelated to your question, but for years now, the ros convention is to not use a leading slash on a frame name.