Issue with g++ and template classes (other than STL classes).

The g++ compiler still has difficulty with user-defined template
classes.  (The STL appears to be implemented perfectly and just work.)


  To make g++ happy, and avoid multiple definitions, etc:

Files using the templated class (e.g., the one containing main)
#include both "class.h" AND "class.cpp"

This forces template instantiation at the right time.

No big deal for getting student projects to work.  (Possible show
stopper in big 100,000+ LOC industrial project with zillions of
files).

NOTE:  header file of templated class does NOT include the code file.
(That would lead to multiple definition problems.)