Function template in C++

Function template:- It is also created for preparing family o generic functions as class template in which arguments of various data types are exist. Syntax of template function is same as general function’s syntax but before it template <class T> is used.

Syntax :- template < class T >
                 return_type function_name ( arguments );
                 statements;
..............
Body of function with type T
}

• Function template with multiple parameter –
Template function can also have two or more generic data type as template class which is differentiated by (,) comma operator.
Syntax:-
template < class T1, class T2 >
return_type function_name ( arg of type T1, type T2){
              statements;
             ...............
             ...............
              }

[NOTE:-  A function which is created by function template is called template function. In this way a class which is created by class template is called template class].

Example:-
C++ program for swap function template.
#include<iostream>
#include<string>
template <class T>
void swap(T& x,T& y)
{
     T temp;
     temp=x;
     x=y;
     y=temp;
}
int main()
{
   int a=44 ;
   int b=66 ;
   float s=4.4;
   float t=6.6;
   string mr="Ram";
   string ms="Sita";
   cout<<"Before swap a: "<<a<<" b: "<<b<<endl;
   swap(a,b);
   cout<<"After swap a: "<<a<<" b: "<<b<<endl;
   cout<<"Before swap s: "<<s<<" t: "<<t<<endl;
   swap( s, t );
   cout<<"After swap s: "<<s<<" t: "<<t<<endl;
   cout<<"Before swap mr: "<<mr<<" ms: "<<ms<<endl;
   swap(mr,ms);
   cout<<"After swap mr: "<<mr<<" ms: "<<ms<<endl;
   return 0;
}