“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

VisitedSet is a template, not a class, so you can’t use VisitedSet in a nested name specifier such as VisitedSet::getSize(). Just as you specified the declaration of class VisitedSet for all class T, you must specify the definition of VisitedSet::getSize() for all class T:

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

The name of a template can, however, be used as though it were a class within a template definition:

template
struct Example {
    Example* parent;
    T x, y;
};

In this case, Example is short for Example.