class operator c++ code example

Example 1: c++ operator overloading

// money.h -- define the prototype
class Money
{
   public:
      Money & operator += (const Money &rhs);
}

// money.cpp -- define the implementation
Money& Money :: operator += (const Money &rhs)
{
   // Yadda Yadda
  
   return *this;
}

Example 2: c++ overload operator

#include <iostream>
using namespace std;

class Box {
   public:
      double getVolume(void) {
         return length * breadth * height;
      }
      void setLength( double len ) {
         length = len;
      }
      void setBreadth( double bre ) {
         breadth = bre;
      }
      void setHeight( double hei ) {
         height = hei;
      }
      
      // Overload + operator to add two Box objects.
      Box operator+(const Box& b) {
         Box box;
         box.length = this->length + b.length;
         box.breadth = this->breadth + b.breadth;
         box.height = this->height + b.height;
         return box;
      }
      
   private:
      double length;      // Length of a box
      double breadth;     // Breadth of a box
      double height;      // Height of a box
};

// Main function for the program
int main() {
   Box Box1;                // Declare Box1 of type Box
   Box Box2;                // Declare Box2 of type Box
   Box Box3;                // Declare Box3 of type Box
   double volume = 0.0;     // Store the volume of a box here
 
   // box 1 specification
   Box1.setLength(6.0); 
   Box1.setBreadth(7.0); 
   Box1.setHeight(5.0);
 
   // box 2 specification
   Box2.setLength(12.0); 
   Box2.setBreadth(13.0); 
   Box2.setHeight(10.0);
 
   // volume of box 1
   volume = Box1.getVolume();
   cout << "Volume of Box1 : " << volume <<endl;
 
   // volume of box 2
   volume = Box2.getVolume();
   cout << "Volume of Box2 : " << volume <<endl;

   // Add two object as follows:
   Box3 = Box1 + Box2;

   // volume of box 3
   volume = Box3.getVolume();
   cout << "Volume of Box3 : " << volume <<endl;

   return 0;
}

Example 3: operator c++

Common operators
assignment | increment | arithmetic |  logical | comparison | member | other
		   | decrement |            |		   |		    | access |
-----------------------------------------------------------------------------                            
  a = b    |    ++a    |     +a	    |	 !a	   |   a == b   |  a[b]  | a(...)
  a += b   |	--a	   |     -a		|  a && b  |   a != b   |   *a   |  a, b
  a -= b   |	a++	   |   a + b	|  a || b  |   a < b    |   &a   |  ? :
  a *= b   |	a--	   |   a - b	|	       |   a > b    |  a->b  |
  a /= b   |		   |   a * b	|	       |   a <= b	|  a.b   |
  a %= b   |		   |   a / b	|		   |   a >= b	|  a->*b |
  a &= b   |		   |   a % b	|		   |   a <=> b	|  a.*b  |
  a |= b   |		   |     ~a		|		   |		    |		 |
  a ^= b   |		   |   a & b	|		   |   		    |		 |
  a <<= b  |		   |   a | b	|		   |			|		 |
  a >>= b  |		   |   a ^ b	|		   |			|		 |     
   		   |		   |   a << b	|		   |			|		 |  
     	   |		   |   a >> b	|		   |			|		 |