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Template Functions 
*  We can also produce functions that have template parameters. This allows us to write functions that can take a wide range of parameter types that are generic to the function definition
For example, we could write a simple swap procedure for any type of data: 
* 
template < class T>
void swap(T&a, T&b)
{
Tt;
t = a;
a = b;
b = t;
}; 
*  Whenever we call swap the compiler will examine the types of its parameters and then generate the appropriate version of the swap procedure, if it hasn't already been generated
Examples: 

int i, j;
double x, y; 
* 
swap(i, j); swap(x, y); swap(i, x);  // generate swap(int, int)
// generate swap(double, double)
// error, both parameters to swap 
                                 // must be of the same type