how to over load 5+obj

Question

1.00/5 (1 vote)

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C++

#include <iostream.h>
#include <conio.h>
class oo{
     int l; public:
     oo():l(9){} 
      void operator +(int j)
      { 
l=l+j;
           }
      oo operator +(oo k)
      {  l+=k.l;
          return oo;
           }
   void d(){ cout &lt;&lt; l;}
      };

main()
{
oo s;
s+5; // working fine
s.d(); // working fine
5+s; // nolw i  want to do it ?<b></b>
s.d();
getch();
}<

Posted 23-Feb-15 4:13am

Member 11473061

Updated 17-Mar-15 1:50am

v2

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Sergey Alexandrovich Kryukov 23-Feb-15 10:27am

Just look at your code. First two lines are
#include
#include.

Please format it properly. Use "pre" tags.

All right, I've just done it for you, but click "Improve question" to see how it should be done, and do it correctly next time.

—SA

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nv3 · Answer 1 · 2015-02-23T07:06:00

Solution 2

In order to have the compiler resolve the expression

C++

5 + s;

you have to provide a way to convert the object s into an int. That can be done by overloading

C++

int operator()()

that is the cast operator. Follow Sergey's links and you will learn how to do that.

Posted 23-Feb-15 7:06am

nv3

Comments

CPallini 23-Feb-15 15:41pm

5.

Stefan_Lang 24-Feb-15 3:44am

This would work, but introducing cast operators can be dangerous. While the code above already has more serious issues than that, I'd prefer declaring an additional operator+ outside the class. See my solution.

Stefan_Lang · Answer 2 · 2015-02-23T21:40:00

Declare the required operator outside your class, like this:

C++

int operator+(int i, oo& o) {
   return o+i;
}

P.S.: I would have declared that second argument as const, but that would require your existing operator declarations to be const correct. It would also help if your operator implementations were consistent with expectations, i. e. they shouldn't modify the underlying object, unless you're overriding operator+=().

Sergey Alexandrovich Kryukov · Answer 3 · 2015-02-23T04:31:00

Solution 1

Not clear. Please see:
http://en.cppreference.com/w/cpp/language/operators[^],
http://www.tutorialspoint.com/cplusplus/cpp_overloading.htm[^],
http://en.wikipedia.org/wiki/Operator_overloading[^].

—SA

Posted 23-Feb-15 4:31am

Sergey Alexandrovich Kryukov

Comments

CPallini 23-Feb-15 15:41pm

5.

Sergey Alexandrovich Kryukov 23-Feb-15 15:49pm

Thank you, Carlo.
—SA

how to over load 5+obj

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