CODEWITHSUNDEEP
c++operator-overloading
sv_jan5
sv_jan5

Reputation: 1573

Overriding conversion of primitive data types

In the code below I am trying to overload the = operator of int. So that I could support int A= &d statements in my program. 

class Data{
public:
    int a;
    Data(int A): a(A) {}
    operator int()  {return a;}
};

int operator=(int &lhs, Data* rhs){
    lhs = rhs->a;
    return lhs;
}

int main(){
    Data d(10);
    int A = &d;
    return 0;
}

But it's giving compile time error:

error: ‘int operator=(int&, Data*)’ must be a nonstatic member function int operator=(int &lhs, Data* rhs){
test1.cpp: In function ‘int main()’:
test1.cpp: error: invalid conversion from ‘Data*’ to ‘int’ [-fpermissive] int A = &d;

Please suggest me the right way of overloading the operator.

Upvotes: 2

Views: 274

Answers (2)

Sergey
Sergey

Reputation: 8238

You do not need assignment operator (operator=) overload in your class. Moreover, it cannot take two arguments.

All you need is cast operator (your operator int() {return a;}) and a proper assignment like int A = d;. When you write & before d, you put address of d into A if int is wide enough to store pointers on your system.

Upvotes: 0

Anton Savin
Anton Savin

Reputation: 41301

You can't overload an assignment to int. As the compiler tells you, operator= has to be a non-static member function of a class, end of story.

You already have the conversion to int in your class, so you can write int A = d;.

Upvotes: 2

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