Re: [Boost-users] shared_ptr sharing the same ref count

From: Loïc Joly (loic.joly_at_[hidden])
Date: 2007-04-13 03:26:07

Peter Dimov a écrit :

> 
> If you are using a Boost release, you can do:
> 
> shared_ptr<Owned> getOwned( shared_ptr<Owner> p, int i )
> {
>     return shared_ptr<Owned>( &p->owned[ i ], boost::bind( 
> &shared_ptr<Owner>::reset, p ) );
> }
> 
> which is essentially your:
> 
> 
>>- Make unknownType a class that contain a shared_ptr<Owner> and a
>>Owned*, and forward all its functions to Owned.
> 
> 
> Of course you need to keep the vector<> from reallocating since your pointer 
> will dangle.
> 
> If you are using the very latest CVS version that includes explicit support 
> for shared_ptr aliasing, it's even easier:
> 
> shared_ptr<Owned> getOwned( shared_ptr<Owner> p, int i )
> {
>     return shared_ptr<Owned>( p, &p->owned[ i ] );
> }

Thank you !

-- 
Loïc