title: Application of Callback Function
body: <p>I want to know where <code>callback functions</code> are actually used ?</p>
  
  <p>And is there a way to implement callback function ( other than using function pointer ) in C/C++ ?</p>
  
  <p>Please explain the following line - </p>
  
  <p>"<code>A callback can be used as a simpler alternative to polymorphism and generic programming</code>"</p>
  
  <p>Thanks</p>