Just use two parallel containers: one for names, and one for values. It is dead simple to check that they have the same size and iterate over both simultaneously where needed. And the best part is, for code that does not actually require both pieces of information, you can pass one of the lists and pretend that the other does not exist. Code that only knows how to visit values only has to deal with values and not weird hybrid name/value elements.

Seriously, always try the simpler thing first. Do not go deeper into templates and special syntax before seeing if any other construct will do the job.