[boost] Re: Re: Re: Re: Re: [pointer container] copyability

From: Thorsten Ottosen (nesotto_at_[hidden])
Date: 2005-04-27 09:29:05

"Peter Dimov" <pdimov_at_[hidden]> wrote in message 
news:001001c54ab9$32f6d6d0$6401a8c0_at_pdimov2...
| Thorsten Ottosen wrote:
| > because you had to put "polymorphic" in front of "value" to describe
| > what it means;
| > polymorphic objects don't have value-based copy-semantics; you can't
| > provide meaningful copy-constructor
| > and copy-assignment operators.
|
| A cloning pointer holding a polymorphic object is CopyConstructible and
| Assignable. Why is this not meaningful?

it could be, but know you're not talking about the original, wrapped 
polymorphic object.

| A vector of cloning pointers is also CopyConstructible and Assignable.

cool, then use that if you need to; but without move-semantics you're gonna 
pay performance wise.

-Thorsten