Passing pointer argument to copy constructor

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C++

Hi All,

I would like to know why copy constructor always takes reference as a parameter. Why can't it take pointer.

i know that benefit of using reference is to avoid application crash. If you pass object as a reference to any function then compile time checking is done to check object is created/exist.
But if you pass uninitialized/NULL pointer to functions by mistake then that checking is not done at compile time and that is results in to application crash.

but that is something programmer can guarantee to initialize ptr and pass to
copy constructor.

Can anybody tell me what could be the exact reason for choosing references only.

Thanks in advance