In part 2, STL will teach us all about Template Argument Deduction. Template arguments are deduced when a call is made to a template function, but some or all template arguments are omitted. The compiler will attempt to deduce the intended template arguments. In most cases, this works as expected. If it does not, a compilation error occurs, in which case you should specify the template arguments explicitly. Now, let's see what Stephan has to say about this.
Tune in. Learn.