Something tells me I am going to have to specialise some templates where a memcopy is required to save the last println'd value of a variable. I can modify the comparison portion of the debug routine at the same time. I was considering comparing only a limited part of the value in that instance, although a strcmp makes the code look pretty minimal regardless.
Certainly nicer doing it this way than instantiating each version of the functions add / debug(var) / debug(name + var) by hand.