Operator overloading easy code

This an easy code for operating overloading.
cpp code

//So now you ask, what is this operator overloading stuff, how will it help
// me make the supreme burrito, and what the heck does "binary operator overloading" 
//mean? Lets take this one step at a time. First, a quick example of operator overloading. 

#include <iostream.h>
 
class Burrito 
{
  private:
    int amtbeef, amtbean;
  public: 

    Burrito(int beef, int bean) {
      amtbeef = beef;
      amtbean = bean;
    }
    Burrito operator + (Burrito newburrito) 
	{
      int newbeef = amtbeef + newburrito.amtbeef;
      int newbean = amtbean + newburrito.amtbean;
      return Burrito(newbeef, newbean);
    }
};

void main(void) 
{
  Burrito b1(5,10), b2(10,5), b3;
  b3 = b1 + b2;

//  cout<<b3<<endl;
}

Thanks

operator overloading help programmer so much in data structure

like stack in this example

Stack outer_stack;
for (int i = 0; i < 1000000; i++) {
Stack inner_stack;
inner_stack.push(some_data);
inner_stack = outer_stack;
}

can you figure out where will be the problem without using operator overloading?

updated.