C++: Why a copy constructor can not use pointer in place of reference variable ?

Question

We define copy constructor using
A(const A & obj)

Why reference (&) is needed?
Why we are not allowed to use.

A(const A obj)

Answer 1

Hi Neelam,

Just to clear your doubt, pointer can be used in used for copy constructor but prefer to use reference variable since it is considered as constant pointer.

Comments

Thanks Rupam for your input. After posting this query, I wrote a copy constructor with pointer variable and it compiled successfully.