Template-based collection classes, or templates, give you the advantages of speed and type-safe usage. When templates are used sparingly, their code size can be quite small. When templates are used with many different types, however, their code size can become large because each type effectively generates a whole new class. If you have the C++ Standard Library, you can use the Essential Tools Module template-based collections that are based on the C++ Standard Library. If you do not have the C++ Standard Library, you can use a subset of the templates, described in The C++ Standard Library Containers and Iterators and the std() Gateway.