Re: Re: Re: How to use Iterator Adaptors?

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-06-04 15:34:52

"Marshall Clow" <marshall_at_[hidden]> wrote in message
news:p0511190fb921ff8971bf@[192.168.16.220]...
> At 10:02 PM -0700 6/3/02, Duane Murphy wrote:

> >The canonical example is a file iterator; iterate over the files in a
> >directory. The directory appears to be a container with filenames as the
> >members of the container.
>
> I have gone back to this example several times in the last few years.
>
> I have finally decided that this is a bad idea, because a file system
directory
> is not really a container. The container can be changed outside the
currently
> executing program, and there is no "container-like" semantics to tell the
program
> that the iterators into that container are invalid.

??
Except in some implementations' debug mode, none of the standard containers
tell the program when their iterators become invalid either.