Re: [Help-smalltalk] Is PeekableStream available in 3.1?

[Rick Flower]

Paolo,

The reason I was subclassing that class was to add in the missing (at  
least in gst 3.1) PositionableStream class so I could use the upToAll  
method on a pipe..

On May 20, 2010, at 12:37 AM, Paolo Bonzini <address@hidden> wrote:

> On Thu, May 20, 2010 at 03:19, Rick Flower <address@hidden>  
> wrote:
> > On Wed, 19 May 2010 16:47:58 -0700, Rick Flower <address@hidden>
> > wrote:
> > > On Wed, 19 May 2010 16:34:14 -0700, Rick Flower <address@hidden 
> > > flower.com>
> > > wrote:
> > > > I see it sitting in the kernel directory but when I try to use it
> > > > for subclassing, I get the following complaint :
> > > >
> > > > key PeekableStream not found
> > >
> > > In looking at it further I believe it's related to the
> > > namespace it's sitting in (kernel) whereas the regular
> > > Stream class has no namespace reference.. I guess I'll
> > > have to see how to get into the kernel namespace for
> > > my subclass.. Time to RTFM!
> >
> > I'm now referring to build 3.2 (but 3.1 shows the same
> > issue)..
> >
> > Ok.. Did the RTFM thing and found that if I add "Kernel."
> > to the front of the PeekableStream reference that I get
> > further but not without a core dump.. Below is the sub
> > class I'm working on -- it doesn't seem to matter whether
> > I've defined any methods or not -- the result is the same:
> >
> > Kernel.PeekableStream subclass: PositionableStream [
> >
> > ]
>
> The core dump is obviously not expected.
>
> However, the PeekableStream is in "Kernel" because you're not supposed
> to refer to it.
>
> Whenever you send #peek to a Stream that doesn't implement it itself
> (and PositionableStreams do), it is transformed behind the scenes to a
> PeekableStream.
>
> Paolo