Function Templates in C++

// Function template example.

#include <iostream.h>

#include <conio.h>

// This is a function template.

template <class X> void swapargs(X &a, X &b)

{

      X temp;

      temp = a;

      a = b;

      b = temp;

}

int main()

{

      clrscr();

      int i=10, j=20;

      double x=10.1, y=23.3;

      char a='x', b='z';

      cout << "Original i, j: " << i << ' ' << j << '\n';

      cout << "Original x, y: " << x << ' ' << y << '\n';

      cout << "Original a, b: " << a << ' ' << b << '\n';

      swapargs(i, j); // swap integers

      swapargs(x, y); // swap floats

      swapargs(a, b); // swap chars

      cout << "Swapped i, j: " << i << ' ' << j << '\n';

      cout << "Swapped x, y: " << x << ' ' << y << '\n';

      cout << "Swapped a, b: " << a << ' ' << b << '\n';

      getch();

      return 0;

}