Re: [Boost-users] [array] VC++ 7.1 bug and a proposed fix

From: John Maddock (john_at_[hidden])
Date: 2006-07-26 05:01:26

Daryle Walker wrote:
>> It is assignable, just not copy-constructable (or at least not
>> without a core change making arrays copy-constructable).  I wasn't
>> expecting copy-construction and assignment to behave differently and
>> it confused me. Happens easily :-)
> 
> AFAIK, class types with (non-static) array members are _both_
> assignable and copy-constructible.  See section 12.8 in the 2003 C++
> standard, paragraph 8 for the copy constructor and paragraph 13 for
> the assignment operator.  But you MUST use the implicit copying
> routines, at least for the copy constructor, since arrays do _not_
> have explicit copying semantics.  This means that generally you must
> wrap array members in an private struct if you need non-implicit
> construction, using a private static member function that returns the
> array's initial value.  See what I did with the
> "my_configuration::hook" class in "rational_test.hpp" for an example. 

Doh!  Astonishing how much there is in this language to learn (still!)

Thanks for the correction,

John.