“used without template parameters”

Question

I realize similar questions have been asked before, but I read a couple of those and still don\'t see where I\'m going wrong. When I simply write my class without separating th

Answer 1

You have to state the template parameter in the definition as well

template
int VisitedSet::getSize() {
    return vec.size();
}

otherwise the compiler cannot match it to the declaration. For example, there could be specializations for some parameter types.