Copy constructor revisited

[Nathan Sidwell]

Robert Schweikert wrote:
> I have another question about the copy ctor accessibility requirement
> and the changes in 3.4.
> 
> I pretty much understand the requirements and interpretation of the
> Standard w.r.t. private copy ctor usage. As it pertains to the example
> on http://gcc.gnu.org/gcc-3.4/changes.html
> 
> However, what happens with a protected copy ctor and access of that ctor
> by its derived class?

> B can access the copy ctor of A since it is protected and not private
> and B is a derived class of A.
Only for those A's that are bases of the B' member's this pointer.

> Yet trying to compile this code yields an
> error:
because it is for a copy of not-a-base-of-a-B

nathan
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