-Original Message-
From: Jeremy Howard [mailto:[EMAIL PROTECTED]]
[...]
Programmers shouldn't have to know how a
computer implements things behind the scenes--which is really what requiring
explicit looping forces.
Great point, this should be in the RFC.
-Corwin
Jonathan Scott Duff wrote:
>
> On Tue, Aug 15, 2000 at 05:47:53PM -0600, Nathan Torkington wrote:
> > I want
> > @result = @a || @b;
> > to be like:
> > (@result = @a) or (@result = @b);
> >
> > That's what all my students keep expecting it to mean.
>
> And that's what I keep wishing it mea
=head1 REFERENCE
Icon language brief intro :
http://www.cs.arizona.edu/icon/intro.htm
hi,
> > So how is that different from:
> >
> > do BLOCK1 until do BLOCK2
>
> It's the same.
> But the real fun starts when blocks and functions can suspend and
> resume.
>
>{ ...
> # Return value and suspend.
> suspend $i;
> # Next iteration will resume here
> ...
>} a
Johan Vromans wrote:
> > So how is that different from:
> >
> > do BLOCK1 until do BLOCK2
>
> It's the same.
No, not quite. See my other post.
--
John Porter
On Wed, Aug 16, 2000 at 07:42:33PM +1000, Jeremy Howard wrote:
> raptor wrote:
> > ]- I tried minimalistic approach as small as possible additions to the
> Perl
> > language, we get only the "backtrack" mechanism i.e. something that is
> > harder or slower to be done outside of the perl core.
> >
Damian Conway wrote:
>
> So how is that different from:
>
> do BLOCK1 until do BLOCK2
>
> ???
Because if BLOCK1 ever evaluates to False, the operation terminates.
It's more like
do { r = f1() } until ( not r or f2() );
--
John Porter
> "MC" == Mark Cogan <[EMAIL PROTECTED]> writes:
>> is equivalent to
>>
>> @a = (\$a, \$b, \$c);
>>
>> rather than what you wrote.
MC> Ah, so it is. I'd argue that that's broken and should be handled with map
MC> or for.
Err, That's not an accident. Larry designed that in.
--
Chaim F
Johan Vromans wrote:
> Damian Conway <[EMAIL PROTECTED]> writes:
>
> >> As I understand things:
> >>
> >> BLOCK1 andthen BLOCK2
> >>
> >> evaluates BLOCK1 and then if BLOCK1 evaluates to "true" evaluates
> >> BLOCK2. If BLOCK2 evaluates to "true" we're done. If BLOCK2
> >
Damian Conway <[EMAIL PROTECTED]> writes:
>> As I understand things:
>>
>> BLOCK1 andthen BLOCK2
>>
>> evaluates BLOCK1 and then if BLOCK1 evaluates to "true" evaluates
>> BLOCK2. If BLOCK2 evaluates to "true" we're done. If BLOCK2
>> evaluates to "false", then BL
raptor wrote:
> ]- I tried minimalistic approach as small as possible additions to the
Perl
> language, we get only the "backtrack" mechanism i.e. something that is
> harder or slower to be done outside of the perl core.
> The rest should be done outside . (I too want all in the core)
I don't
> > They behave similarly like &&, ||, and, or operator with one main
> > distinction they "backtrack" for example:
> >
> > { block1 } B { block2 };
>
> This would be a good use of the to-be-liberated => operator:
>
> { block1 } => { block2 };
>
> In any case, "andthen" doesn't seem like a good
> There's also the cut operator which I didn't see mentioned in the RFC.
> It blocks backtracking so that something like this:
>
> B1 andthen B2 andthen cut B3 andthen B4 andthen B5
> wouldn't backtrack to B2 once it forwardtracked to B3.
]- I tried minimalistic approach as small as possible addi
Mark Cogan wrote:
> At 11:11 PM 8/15/00 -0400, Chaim Frenkel wrote:
> >You are missing the beauty of vector/matrix operations.
>
> No, I'm not; I'm opining that the vast majority of Perl users don't need
to
> do vector/matrix ops, and that they don't belong in the core.
>
The vast majority of Perl
Mark Cogan wrote:
> At 12:39 PM 8/16/00 +1000, Jeremy Howard wrote:
> >It seems obvious that @a should be the whole array @a, not the size of
the
> >array. If I want to check the size of @a, I should have to do so
explicitly,
> >with scalar or $#.
> >
> >This is non-obvious if you think that || is
On Tue, Aug 15, 2000 at 10:26:13PM -0600, Nathan Torkington wrote:
> I like the idea of adding the context-aware operators, but I don't
> think I'd use them as often as I use "the number of things in the
> array". I think most Perl programmers would be in the same camp.
> Unless you can show a co
This and other RFCs are available on the web at
http://dev.perl.org/rfc/
=head1 TITLE
Backtracking
=head1 VERSION
Maintainer: iVAN Georgiev <[EMAIL PROTECTED]>
Date: 14 Aug 2000
Version: 1
Mailing List: [EMAIL PROTECTED]
Number: 104
=head1 ABSTRACT
Backtraking mechanism is core f
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