Re: [boost] Re: Re: Re: Re: Re: New patch for operators.hpp uploaded

From: David Abrahams (dave_at_[hidden])
Date: 2002-10-25 10:49:28

Daniel Frey <d.frey_at_[hidden]> writes:

> On Thu, 24 Oct 2002 19:02:03 +0200, David Abrahams wrote:
> 
> >> The question is, why 'X x( f() );' is different from 'X x = f();'.
> > 
> > I remember having this conversation with the EDG guys last year. For
> > people whose heads are deep in the core language, apparently it isn't
> > obvious that they should be the same, and that it won't be obvious to
> > users which form avoids the extra copy.
> 
> As I said earlier in this thread, the EDG-folks proved me wrong more than
> once. Do you remember any details or their argumentation? 

There was no argumentation, except on my part regarding what would be
obvious to users. We all understood that both optimizations were
optional.

> And does this mean that the GCC 3.1+ is actually optimizing things
> it shouldn't? (I don't hope so...)

No.

-- 
                    David Abrahams
dave_at_[hidden] * http://www.boost-consulting.com