Re: Pre-Scheme static allocation

On Thu, Oct 29, 2015, at 12:46 AM, Michael Sperber wrote:
> 
> Thomas Hintz <[email protected]> writes:
> > In this case I would like to keep a buffer of characters that are being
> > displayed on the screen. So I need to be able to do operations like
> > "string-ref" and "string-set!" on that buffer. But if I try to do this:
> >
> > (let ((buf "000000"))
> >   (string-set! buf 0 #\a)
> >   (string-ref buf 0))
> 
> Primarily because it's not valid Scheme: The literal is read-only.  I
> think what you should do is just a regular buffer, and, if you want to
> transfer contents from a literal string, do so explicitly.

Oh of course. Sorry. I should have gone to bed earlier...

What do you mean by a 'regular buffer'? Do you mean like 'make-string'?
If so, is there another way to do something like that besides using
make-string, make-vector, or allocate-memory? Those appear to always use
a form of 'alloc' which ideally I wouldn't have to rely on. Or am I
missing something entirely?

(I realize now my original confusion was with the type inference making
me think I could do something that doesn't make sense Scheme wise, even
though it could from C.)

Thanks,
Thomas Hintz