Template classes

- [Instructor] Template classes are commonly used…for operating on containers.…Here I have a working copy of template-class.cpp…from chapter seven of the exercise files.…This is a simple LIFO stack, last in first out.…There's a more complete version…in the standard template library.…I've created this simple version…so we can see how it works.…The important thing to notice about this…is that there's really no code here…that cares about what type the items are on the stack.…So here we have a simple exception class…and we'll talk more about exceptions later in this course.…

This is for error reporting.…This is the LIFO stack class itself,…notice we start with the template syntax,…it's the same as with template functions.…We've the template keyword…and then in angle brackets typename…which could be the word class but I use typename,…either one works and I consider this to be less ambiguous…and a capital T which is a common abbreviation…for the templated type so that T can be used anywhere,…a type can be used.…

For example here we have a T pointer for stack pointer…