How do I pass a template as a template parameter to a template?

Question

I\'m trying to write something like:

          // I don\'t know how this particular syntax should look...
template Functo         


        

Answer 1

The way you use it is correct. But your function template definition itself is wrong.

It should be this:

template class FunctorT> //<---here is the correction
Something MergeSomething(const Something& lhs, const Something& rhs)

And Ty is not needed. In fact, its meaningless there. You can omit it completely.

See this article by Stephen C. Dewhurst:

• C++ Common Knowledge: Template Template Parameters