Small question , can you help me ??

Hi for ever :)

I am asking about :

How to addition two object with different type and then store the result in the object have same type of one of these two object
by using operator overloading ?

for example :

we have class called ThreeD

Code:

---

ThreeD operator +(ThreeD op1, ThreeD op2)
  {
    ThreeD result = new ThreeD();
 
    /* This adds together the coordinates of the two points
      and returns the result. */
    result.x = op1.x + op2.x; 
    result.y = op1.y + op2.y; 
    result.z = op1.z + op2.z; 
 
    return result;
  }

---

in these example we add two object of same type in the same class

What about if I have two classes
and I wanted to add object from class 1 to object from class 2
and then store the result in objcet of type of class 1


Thats all ,
thanks to reed my question ,
I wait the answer :)

You would just define operator+ to take the objects you want to add together:

Code:

---

ReturnType operator+(FirstType left_hand, SecondType right_hand)
{
    //whatever it means to add together
}

---

It might also be possible if FirstType has a non-explicit constructor that accepts a SecondType.

Code:

---

class First
{
    int m;
    public:
    First(int n): m(n) {}
    int get() const { return m; }
};

class Second
{
    int m;
    public:
    Second(int n): m(n) {}
    Second(First first): m(first.get()) {}  //First can be inplicitly converted into Second

    int get() const { return m; }
};

Second operator+(Second lhv, Second rhv)
{
    return Second(lhv.get() + rhv.get());
}

int main()
{
    Second s1(10), s2(5);
    First f(5);
    s2 = s1 + f;
    s1 = f + s2;
}

---

but :

if the code is written as :

Code:

---

FirstType operator+(FirstType left_hand, SecondType right_hand)
{

    FirstType result;
  result=left_hand+right_hand;
  return result ;

}

---

this what I need

but it make error :(

How can I make it true ??

tabstop & anon
thanks very much :)

Last chance to stop colouring your posts, like this is some kindergarden forum using wax crayons.

The error in this code seems to be that you are hoping to implement operator+ in terms of the same operator+.

If that worked here's my first MMORPG

Code:

---

void Mmorgp()
{
    Mmorgp();
}

int main()
{
    Mmorgp();
    //profit
}

---

:)

Well. You need to figure out what left_hand+right_hand means -- right now, you're just defining + by saying "if you see +, what you really need to do is +", which means we look + up again, and so on. You have to actually write the code inside the function.

Quote:

---

Last chance to stop colouring your posts, like this is some kindergarden forum using wax crayons.

---

oh , soory .!!
I dont know that it is dissenting !
I will never do it :)

..

tabstop & anon
thanks very very very much
I will try the ways .