develooper Front page | perl.perl6.internals | Postings from February 2001

Re: PDD 2, vtables

From:
David Mitchell
Date:
February 7, 2001 09:19
Subject:
Re: PDD 2, vtables
Message ID:
200102071719.RAA10075@tiree.fdgroup.co.uk
Nicholas Clark <nick@ccl4.org> mused:
> On Wed, Feb 07, 2001 at 04:03:49PM +0000, David Mitchell wrote:
> > BTW, should the vtable include all the mutator operators too, ie
> > ++, += and so on, on the grounds that an implementation may be able
> > do this more efficiently internally?
> 
> ++ and -- are already slightly messy in perl5
> 
> pp_preinc, pp_postinc, pp_predec and pp_postdec live in with all the ops.
> They know how to increment and decrement integers that don't overflow,
> and call routines in sv.c to increment and decrement anything else.
> 
> Actually, this nearly provides a divide between values and operators
> that has been suggested, with the speed up hack for the common case.

I'm not sure I follow you. What is the "this" in "this nearly provides a
divide"?

Confused of Sheffield.

nntp.perl.org: Perl Programming lists via nntp and http.
Comments to Ask Bjørn Hansen at ask@perl.org | Group listing | About