How do I force a particular instance of a C++ template to instantiate?

Question

See title. I have a template. I want to force a particular instance of a template to instantiate. How do I do this?

More specifically, can you force an abstract temp

Answer 1

What you also can try is explicit instantiation:

template class vector;                    // class
template int& vector::operator[](int);    // member
template int convert(double);      // function