+ is overloaded for int + Point : overload object and primitive data type « Operator Overloading « C++ Tutorial

Home
C++ Tutorial
1.Language Basics
2.Data Types
3.Operators statements
4.Array
5.Development
6.Exceptions
7.Function
8.Structure
9.Class
10.Operator Overloading
11.Pointer
12.File Stream
13.template
14.STL Introduction
15.string
16.vector
17.list
18.bitset
19.set multiset
20.valarray
21.queue stack
22.deque
23.map multimap
24.STL Algorithms Modifying sequence operations
25.STL Algorithms Non modifying sequence operations
26.STL Algorithms Binary search
27.STL Algorithms Sorting
28.STL Algorithms Merge
29.STL Algorithms Min Max
30.STL Algorithms Iterator
31.STL Algorithms Heap
32.STL Algorithms Helper
C / ANSI-C
C Tutorial
C++
Visual C++ .NET
C++ Tutorial » Operator Overloading » overload object and primitive data type 
10.2.2.+ is overloaded for int + Point
#include <iostream>
using namespace std;

class Point {
  int x, y;
public:
  Point() {}
  Point(int px, int py) {
    x = px;
    y = py;
  }

  void show() {
    cout << x << " ";
    cout << y << "\n";
  }

  friend Point operator+(Point op1, int op2);
  friend Point operator+(int op1, Point op2);
};

// + is overloaded for Point + int.
Point operator+(Point op1, int op2)
{
  Point temp;

  temp.x = op1.x + op2;
  temp.y = op1.y + op2;

  return temp;
}
// + is overloaded for int + Point.
Point operator+(int op1, Point op2)
{
  Point temp;

  temp.x = op1 + op2.x;
  temp.y = op1 + op2.y;

  return temp;
}

int main()
{
  Point ob1(1020), ob2530), ob3(714);

  ob1.show();
  ob2.show();
  ob3.show();

  ob1 = ob2 + 10// both of these
  ob3 = 10 + ob2; // are valid

  ob1.show();
  ob3.show();

  return 0;
}
10 20
5 30
7 14
15 40
15 40
10.2.overload object and primitive data type
10.2.1.Overload for integer + object and object + integer.
10.2.2.+ is overloaded for int + Point
10.2.3.+ is overloaded for Point + int
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.