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Subject: Re: [boost] [function] "paranoia" vs efficiency
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-11-09 09:48:35

Domagoj Saric wrote:
> "Stewart, Robert" <Robert.Stewart_at_[hidden]> wrote
> > As soon as you specialize the class template with anything other
> > than the default deleter type, you have a different type.
> > shared_ptr<T>
> > is shared_ptr<T>, even if they use different deleters. your_ptr<T>
> > isn't your_ptr<T,other_deleter>.
> yes it is, if "other_deleter" is in fact the default
> "dynamic_deleter" class
> that is again in fact only a wrapper around an actual dynamc
> deleter (>just
> like the current boost::detail::sp_counted_impl_pd<> class
> is< as said in my
> previous post)...

That's a big "if." The point is, your_ptr<T> is not the same as shared_ptr<T>. If you want a class with a potentially different deleter type, create one, document it, and submit it to Boost. The value of shared_ptr<T> is that all shared_ptr<T>'s have the same deleter type, so they are always compatible.

Perhaps Peter would be willing to implement shared_ptr<T> as deriving from your_ptr<T,dynamic_deleter> in order to share code, but shared_ptr<T> shouldn't be changed to allow parameterizing the deleter type.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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