Project 5 notes and clarifications 2) May 8 (frey) It seems that there is some difficulty if you are trying to create a vector of vertices because the vertex class methods are all private. It seems the vector class must be a friend of the Vertex class too. To do so, make a forward declaration in Vertex.H template class vector; Then add the friendship -- recall that you are making a vector of vertices of T, not a vector of T, so the friendship must be friend class vector >; 1) April 30 (edelman) Note that the vertex class is templatized. You should ask yourself, "what should be the templatized parameter be?". Fundamentally, the template parameter is the interface between the vertex class, which is sealed from the clients, and the things that vertices are composed of. So - - - You will need to develop at least 1 more class to describe the objects that are contained in the vertex class.