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

*/

// function template

#include <iostream>

using namespace std;

​

template <class F>

F sum (T a, T b)

{

  F add;

  add = a + b;

  return result;

}

​

int main () {

  int i=5, j=6, s1;

  double a=3.6, b=5.5, s2;

  s1=sum<int>(i,j);

  s2=sum<double>(a,b);

  cout << s1 << endl;

  cout << s2 << endl;

  return 0;

}