[boost] Re: [review] Formal review of the Smart Container library

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2004-09-27 13:50:34

"Thorsten Ottosen" wrote:

> | It may be also useful to provide few more
> | clone managers in library:
> |
> | - possibly the one that is able to detect dynamic type
> |    at runtime and properly contruct clone, w/o need
> |    for special clone support in class,
>
> hm... how would that work?
>
It is possible. Exception handlers store relation between types
and such handlers could be generated by metaprogramming.
The polymorphic_map uses this trick.

> | - one using non-default allocator and then
> |    placement new
>
> can't you do that from within
>
> T* allocate_clone( const T* ptr )
> { return my_clone_func( ptr ); }
>
> ?
>
Yes but the clong would be separated into few pieces
instead one.

> | - one using serialization/deserialization to create
> |   clone (the serialization process may for example
> |   fluch internal caches or re-adjust some internal
> |   structures)
>
> hm...the thing is that the clone manager controls all cloning, also when
> clones are inserted coming from other containers...seems wierd to me.
>
It is weird but should work.
I use this trick somewhere, so I put it as option.

/Pavel