[boost] Re: iostreams library review

From: Jonathan Turkanis (technews_at_[hidden])
Date: 2004-06-05 00:08:01

"David Abrahams" <dave_at_[hidden]> wrote in message
news:upt8fxspr.fsf_at_boost-consulting.com...
> "Jonathan Turkanis" <technews_at_[hidden]> writes:
>
> > "David Abrahams" <dave_at_[hidden]> wrote in message
> > news:ubrk18u0m.fsf_at_boost-consulting.com...
> >> "Jonathan Turkanis" <technews_at_[hidden]> writes:
> >>
> >> > The caveat is that seeking with respect to stream positions -- 
> > i.e.
> >> > values of type traits_type::pos_type rather than
> >> > traits_type::off_type -- only works as expected for positions
> > which
> >> > are equivalent to integral offsets.
> >>
> >> You lost me here.  What positions aren't?
> >
> > positions that record an offset and a code conversion state.
>
> Oh.  Yeah, I know nothing about that stuff.

You're better off that way -- trust me ;-)

<snip>

> >
> > The offsetbuf could be defined like this (assuming a narrow
stream,
> > for simplicity):
> >
> >   class offsetbuf : public streambuf_facade<offset_filter> {
> >   public:
> >       offsetbuf(std::streambuf& sb, std::streamoff first,
> > std::streamoff last)
> >        {
> >            set_next(sb);
> >            open(offset_filter(first, last));
> >        }
> >   };
> >
> > Here offset_filter is the filter I described before.
>
> If you say so.

Well, I realize I wrote a bunch of stuff without explaning it, and the
documentation is not even available, so I shouldn't expect it to make
any sense. I guess my point was that it can be done with a few lines
of code.

> Anyway, the library would be useful to me if it made
> that possible.

Good. I think I'll add it as an example application, or maybe as part
of the core library.

Jonathan