Re: CComPtr subtlety

"Igor Tandetnik" <>
Mon, 29 Jan 2007 14:55:09 -0500
Jason S <> wrote:

The second constructor is a copy constructor. If you don't provide
one, compiler automatically generates a copy constructor that simply
performs member-wise copy.

is member-wise copy equivalent to:

(a) calling the copy constructor for each member
(b) running memcpy() on the class/structure

The former. Of course, for fundamental types a "copy constructor" is
equivalent to memcpy.

I thought it was (a), in which case I don't think you'd need both
forms, since CComPtr contains a cast operator to the raw pointer

CComPtr<IMyInterface> p;

CComPtr<IMyInterface> q (x); // first one
CComPtr<IMyInterface> r (p); // second one

e.g. the second one could be accomplished by the compiler by calling
the (IMyInterface *) operator on p

But the compiler doesn't do that, because CComPtr(const CComPtr&)
overload is a better match. And again, this overload is always present,
even if you don't explicitly write it.

Having said that, I don't see what this has to do with your (a) and (b)
choices above. The only data member of CComPtr<T> is a raw pointer T* p;
member-wise copy constructor would just copy the pointer.
With best wishes,
    Igor Tandetnik

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