function template examples

Example 1: function template

template <class T>
void swap(T & lhs, T & rhs)
{
 T tmp = lhs;
 lhs = rhs;
 rhs = tmp;
}

void main()
{
  int a = 6;
  int b = 42;
  swap<int>(a, b);
  printf("a=%d, b=%d\n", a, b);
  
  // Implicit template parameter deduction
  double f = 5.5;
  double g = 42.0;
  swap(f, g);
  printf("f=%f, g=%f\n", f, g);
}

/*
Output:
a=42, b=6
f=42.0, g=5.5
*/

Example 2: Function Template

#include <iostream>
#include <string>
using namespace std;


template <class calculator> //Template Definition

calculator addNumber(calculator A, calculator B) {
	return A + B;
}

int main() {

	int		a = 7,	   b = 55;

	float   x = 77.77, y = 8.99;

	double  u = 4.44,  v = 7.88;

	string  i = "My ", j = "God!";



	std::cout << addNumber(a, b) << endl;

	std::cout << addNumber(x, y) << endl;

	std::cout << addNumber(u, v) << endl;

	std::cout << addNumber(i, j) << endl;
}

//Build Generic Function that can handle multiple type of data