Re: [boost] [fusion-2]: Problems with as_map on empty views

From: Andreas Pokorny (andreas.pokorny_at_[hidden])
Date: 2006-01-03 16:01:23

On Mon, Jan 02, 2006 at 10:09:02PM +0000, dan marsden <danmarsden_at_[hidden]> wrote:
> 
> --- Andreas Pokorny <andreas.pokorny_at_[hidden]> wrote:
> 
> > Hi there, 
> > 
> > I have a slight problem with the construction of a
> > map with fusion::as_map 
> > on an empty view: 
> 
> > Should I check if the view is empty before running
> > as_map?
> 
> No you should not need to check for empty sequences
> passed to
> as_map. This behaviour was caused by a defect in
> fusion's comparison of the iterators of filter_view.
> I've checked a fix into cvs and added a test to cover
> the behaviour.
> 
> Compiling your example with the latest version then
> seems to be ok.
> 
> Thanks for picking this one up!

Thanks for fixing it so fast! 

> > I had a related problem, which I am right now unable
> > to minimize.
> > Somehow filter and transform views seem to call the
> > meta functions with 
> > mpl::void_ and fusion::void_. 
> 
> Sorry, I'm not sure what you mean here, was this a
> problem related to the previous example. If not, can
> you provide a bit more detail please?

Just an error message that showed up in conjunction with the error
above. 

Regardas
Andreas Pokorny