From ggrothendieck at gmail.com  Sun Mar 30 18:34:42 2008
From: ggrothendieck at gmail.com (Gabor Grothendieck)
Date: Sun, 30 Mar 2008 12:34:42 -0400
Subject: [Rd] callCC in 2.7.0
In-Reply-To: <f8e6ff050803300904i1a950ed5r58738fb4184ccad0@mail.gmail.com>
References: <971536df0803300710t40f61256x78b9889a5c323924@mail.gmail.com>
	<f8e6ff050803300904i1a950ed5r58738fb4184ccad0@mail.gmail.com>
Message-ID: <971536df0803300934t4f354132od131d1f567652fd0@mail.gmail.com>

I think the only relationship to that is the name since
it does not appear to allow one to leave a function
in the middle of its processing and re-enter it back
at that point -- which is what would be needed.

On Sun, Mar 30, 2008 at 12:04 PM,  <h.wickham at gmail.com> wrote:
>
> > Would anyone like to explain if callCC in R 2.7.0 gives
> > anything that on.exit does not already provide?
> >
> > It seems that the exit condition once defined cannot
> > be added to overridden whereas with on.exit multiple
> > on.exit's add additional on.exits rather than being ignored.
> >
> > Is this important?
>
> It facilitates a completely different style of programming - see
> http://en.wikipedia.org/wiki/Continuation-passing_style
>
> --
> http://had.co.nz/
>



[Rd] callCC in 2.7.0
Gabor Grothendieck