Re: [boost] [smart_ptr] shared_ptr template type

Subject: Re: [boost] [smart_ptr] shared_ptr template type
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-07-09 14:40:39

Sid Sacek wrote:
> From: boost-bounces_at_[hidden]
> [mailto:boost-bounces_at_[hidden]] On Behalf Of Gottlob Frege
>
> > I don't think lock/unlock on each -> call is typically a good
> > idea.
> >  x = p->x;
> >  y = p->y;
> > That's 2 lock unlock sequences instead of one.  Inefficient
> > and what if y changes after you read x?
> > It hides the locking too much, potentially leading to abuse
> > and mistakes.
>
> I agree and disagree. I would at some point want to create a
> class similar to what's being described, but would not expose
> it to the rest of the world to use ( and abuse ). A class like
> that could come in handy, as long as it's used with the
> knowledge of its strengths and limitations.

Tony's on target.  You've said you wanted the class to be a
shared_ptr, which means it can be used in myriad ways without
even knowing the cost.  If it were a distinct type, then it
couldn't be unknowingly misused.

Such a type, were you to create it, should not be a special
version of shared_ptr.  That also avoids forking relative to
C++0x.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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