Re: [boost] Re: auto_array_ptr

From: Greg Colvin (gcolvin_at_[hidden])
Date: 2001-04-05 12:10:23

I thought boost::auto_ptr was intended as a Standard-conforming replacement
for std::auto_ptr on systems that lack their own. Otherwise I don't see the 
point.

----- Original Message ----- 
From: Peter Dimov <pdimov_at_[hidden]>

> From: "Gary Powell" <Gary.Powell_at_[hidden]>
> 
> 
> > Hi Peter,
> >
> >  I emailed way too quick. My B.S. "C++ Programming Language" 3rd Ed. 5th
> > printing book, section 14.4.2 says "auto_ptr_ref is to implement the
> > destructive copy semantics for ordinary auto_ptrs while making it
> impossible
> > to copy a const auto_ptr."
> >
> > Is there another way to ensure this constraint?
> 
> AFAIK auto_ptr_ref supports passing/returning auto_ptrs by value. I think
> that this is unnecessary for boost::auto_ptr, since (1) we have
> boost::shared_ptr for this, (2) passing auto_ptrs by value instead of
> non-const reference is dangerous (exception safety), and (3) returning
> std::auto_ptrs by value is sometimes useful since std::auto_ptr is standard,
> but boost::auto_ptr is not, so it doesn't need this "capability."
> 
> --
> Peter Dimov
> Multi Media Ltd.
> 
> 
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