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Subject: Re: [boost] [Smart Ptr] make_shared slower than shared_ptr(new) on VC++9 (and 10) with fix
From: Nathan Ridge (zeratul976_at_[hidden])
Date: 2012-04-30 16:47:41

> > The downside of having it be a base class is that classes can now be
> > marked final, which means they can't be used as base classes. This
> > approach was used by libc++ for implementing the same optimization
> > that STL mentions VC's STL implements, but I think they end up falling
> > back to storing it if it's empty and final.
> >
> > I suppose what we really want is static if. :)
> Everything you could do with static if you can already do without, just
> with more verbose syntax.
> In this particular case, however, I don't see how any if-like technique
> would help. I cannot think of a method to tell whether a type is empty
> without inheriting from it.

But even if there was a way to tell, how would you use an object like
that without aggregating it (and thus having it take up space) or
inheriting from it (which is not allowed)?


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