Re: [boost] [smart_ptr] enable_shared_from_this::shared_from_this( this );

From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2008-04-16 17:16:18

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On Wednesday 16 April 2008 15:46 pm, Daniel Frey wrote:
> The problem can be solved by either extending or modifying the
> interface: When we add the following method(s):
>
>     template< typename U >
>     shared_ptr<U> shared_from_this( U* u );
>
>     template< typename U >
>     shared_ptr<U const> shared_from_this( U const* u );
>
> it's then possible for a method of T to call shared_from_this(this)
> instead of shared_from_this() to gain a shared_ptr<T>.
>
> Additionally, the interface is generally useful, as it could be called
> with other pointers, e.g. to sub-objects (member variables) of T. It's
> IMHO a nice match to the shared_ptr-constructor which takes a shared_ptr
> and an additional plain pointer.

Wouldn't it be safer to make it a non-template?  The aliasing constructor can 
be easily misused.  If the user really wants to use the aliasing constructor, 
they could always pass the return value from shared_from_this() to the 
aliasing constructor.

- -- 
Frank
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