I overloaded both subscript operator and assignment operator and I am trying to get right value to assignment operator
example
Array x;
x[0]=5;
by overloading subscript operator i can get value 0 but when i overload assignment operator it does the assignment but it doesn't use my overloaded function because vaiable 2 should have value 5.
class Array
{
public:
int *ptr;
int one,two;
Array(int arr[])
{
ptr=arr;
}
int &operator[](int index)
{
one=index;
return ptr[index];
}
int & operator=(int x){
two=x;
return x;
}
};
int main(void)
{
int y[]={1,2,3,4};
Array x(y);
x[1]=5;
cout<<x[0]<<endl;
}
It does not use your operator=
because you are not assigning to an instance of Array
, you're assigning to an int
. This would invoke your operator:
Array x;
x = 7;
If you want to intercept assignments to what operator[]
returns, you must have it return a proxy object and define the assignment operator for that proxy. Example:
class Array
{
class Proxy
{
Array &a;
int idx;
public:
Proxy(Array &a, int idx) : a(a), idx(idx) {}
int& operator= (int x) { a.two = x; a.ptr[idx] = x; return a.ptr[idx]; }
};
Proxy operator[] (int index) { return Proxy(*this, index); }
};