Re: [Boost-users] bind with boost::filesystem::directory_iterator

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2008-04-14 05:04:04

This is untested code, but just to visualize paradigm used by boost file
system and what Daniel explained:

 bfs::path p( "." );
 bfs::directory_iterator begin( p ), end;
 for_each( begin, end, boost::bind(&purgeOlder, _1 )  )

Best Regards,
Ovanes

On Mon, Apr 14, 2008 at 10:07 AM, Daniel Krügler <dsp_at_[hidden]> wrote:

> Brad wrote:
> > Hi guys and gals,
> >
> > I'm new to boost and this is my first attempt to use bind (big step
> LOL).
> >
> > I'm trying to do this:
> >
> >     bfs::path p( "." );
> >     bfs::directory_iterator dir_iter( p );
> >     for_each( dir_iter.begin(), dir_iter.end(), boost::bind(
> > &purgeOlder, _1 )  )
> >
> > but I get:
> >
> > purgefiles.cpp:53: error: 'class boost::filesystem::directory_iterator'
> > has no member named 'begin'
> > purgefiles.cpp:53: error: 'class boost::filesystem::directory_iterator'
> > has no member named 'end'
> >
> > It would appear directory_iterator does not have these members which are
> > common on the other containers, am I missing something? Is there a way
> > to do this using bind?
>
> This has nothing to do with bind. As you say, begin()/end() would
> be available for a *container*, but - as the name says -
> directory_iterator is just an iterator, not a container. If you follow
> the documentation, you will find out, that the default constructed
> directory_iterator corresponds to "end" and that there exists one
> further c'tor that accepts a path - this is the one you should use
> in replacement for begin.
> For a better understanding of the idea behind that you should compare
> directory_iterator with existing std iterator adaptors, like the insert
> iterators or the stream iterators.
>
> HTH & Greetings from Bremen,
>
> Daniel Krügler
>
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