Re: [boost] Re: Re: Re: shared_ptr and ->*

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-07-09 06:56:04

From: "David B. Held" <dheld_at_[hidden]>
> "Paul Mensonides" <pmenso57_at_[hidden]> wrote in message
> news:002a01c2270d$cd16d940$7772e50c_at_c161550a...
> > One concern however....  should the closure facility disallow normal
> copying if
> > it is working in concert with a shared_ptr?

You need to return the closure by value, so it has to be copyable.

> I have no idea!  I barely grok the implementation.  One thing that worries
> me
> is that you leak the pointer to create the closure.  What would be nice is
> if
> the closure itself contained a shared_ptr!  Otherwise, the shared_ptr
might
> self-delete, and someone might try to call the closure.

This depends on whether you need a closure library or just an operator->*.
You aren't allowed to do anything with the result of ->*; the only thing you
are allowed to do is to immediately apply operator() to it. There is no need
to worry about lifetime issues.