S26 Draft
Per autrijus request, I have written a preliminary Synopsis 26 -- Perl Documentation. For your ripping apart pleasures: http://svn.openfoundry.org/pugs/docs/S26draft.pod Cheers, Brian
[S29] update (was: Re: Question about $pair.kv)
Hi, Luke Palmer luke at luqui.org writes: Stevan Little writes: One tests shows $pair.kv returning an array with two elements (the key and value of the pair). (This is also how Pugs currently implements this.) The former is certainly correct. When all else fails, consider a pair to be a one-element hash. then the S29 draft (http://www.rodadams.net/Perl/S29.html) needs updating, as currently it states: What is returned at each element of the iteration varies with function. values returns the value of the associated element; **kv returns a 2 element list in (index, value) order**, pairs a Pair(index, value). Unless, of course, I misunderstand any(S29, Luke) :) -- Is the following correct? my @array = a b c; my @kv= @array.kv; say [EMAIL PROTECTED]; # 6 say [EMAIL PROTECTED]; # 0 a 1 b 2 c FYI, before your post, my assumption was: my @array = a b c; my @kv= @array.kv; say [EMAIL PROTECTED]; # 3 say [EMAIL PROTECTED]; # 0 a say [EMAIL PROTECTED]; # 1 b say [EMAIL PROTECTED]; # 2 c # That means, @kv = ([0, a], [1, b], [2, c]) --Ingo -- Linux, the choice of a GNU | Life would be so much easier if we could generation on a dual AMD | just look at the source code. Athlon!| -- Dave Olson
Re: S26 Draft
Please don't be lazy, everyone, and look at this: http://svn.openfoundry.org/pugs/docs/ There are some more drafts that should be reviewed, and more will probably follow. -- () Yuval Kogman [EMAIL PROTECTED] 0xEBD27418 perl hacker /\ kung foo master: uhm, no, I think I'll sit this one out..: neeyah! pgpUgS9HFH7bz.pgp Description: PGP signature
Re: S26 Draft
On Sun, 2005-04-10 at 14:02 +0300, Yuval Kogman wrote: Please don't be lazy, everyone, and look at this: http://svn.openfoundry.org/pugs/docs/ There are some more drafts that should be reviewed, and more will probably follow. Can we please be rid of: http://svn.openfoundry.org/pugs/docs/advocacy/phd.png It's just rude, and Perl's public face should never be one of rudeness.
[S06] Types of subroutines/blocks/etc.
Hi,
A06 states:
Code
|
| |
RoutineBlock
|_____|___
| | | || | | |
Sub Method Submethod Multi Rule Macro Bare Parametric
[...]
(It's not yet clear whether the CBare vs CParametric
distinction is useful. Some apparently CBare blocks are
actually CParametric if they refer to C$_ internally, even
implicitly. And a CBare block is just a CParametric block
with a signature of C(). More later.)
S06 mentions Bare and Parametric only in the table of standard type
names (with a at least this week on top of it).
So, what are the types of the following Code references?
my $foo = sub ($x) { $x }; # isa Code, Routine, Sub?
my $foo = sub () { 42 }; # isa Code, Routine, Sub?
my $foo = - $x { 42 };# isa Code, Block, Parametric?
my $foo = { $^x }; # isa Code, Block, Parametric?
my $foo = { say }; # (uses $_) # isa Code, Block, Parametric?
my $foo = { 42 }; # isa Code, Block, Bare?
my $foo = - { 42 }; # isa Code, Block, Bare?
FWIW, I don't think the distinction Bare-Parametric is really useful.
And as there's no distinction between Csub () {...} and Csub (...)
{...} either, I'd vote for dropping the Bare-Parametric distinction
and updating S06 accordingly.
--Ingo
--
Linux, the choice of a GNU | Wissen ist Wissen, wo man es findet.
generation on a dual AMD |
Athlon!|
Aliasing swapped values
Hi all, Apologies if this has been covered. What should this do? ($x,$y) := ($y,$x); In Perl5: $x=2; $y=3; print x: $x y: $y\n; (*::x, *::y) = (*::y, *::x); $y=4; print x: $x y: $y\n; $x=5; print x: $x y: $y\n; This program shows typeglob aliasing. If we try to alias swapped value, we merely swap what they are pointing at and we haven't aliased anything. I am not sure this should be appropriate behavior for Perl6. Aliasing will be much more common in Perl6 so this will be a trap for many. In fact, consider this: ($c, $d) := ($y, $x); # later ($x,$y) := ($c, $d); # whoops! That's going to confuse the heck out of people. If we do as Perl5 does, we'll merely be swapping values since aliasing really doesn't make much sense here, but that means for this case, := == =. Cheers, Ovid -- If this message is a response to a question on a mailing list, please send follow up questions to the list. Web Programming with Perl -- http://users.easystreet.com/ovid/cgi_course/
Re: [S29] update
Ingo Blechschmidt wrote: then the S29 draft (http://www.rodadams.net/Perl/S29.html) needs updating, as currently it states: What is returned at each element of the iteration varies with function. values returns the value of the associated element; **kv returns a 2 element list in (index, value) order**, pairs a Pair(index, value). Unless, of course, I misunderstand any(S29, Luke) :) -- Is the following correct? my @array = a b c; my @kv= @array.kv; say [EMAIL PROTECTED]; # 6 say [EMAIL PROTECTED]; # 0 a 1 b 2 c Yes. As for S29, in my head, a list of lists is still just a list. An array of arrays is a different story. So this behavior is what I meant to say in S29. If it's unclear, I'm open to suggestions. -- Rod Adams (who still needs more time to work on S29. Looks like I'll have some in a few weeks. In the meantime, if there's someone else out there itching to work on it, let me know.)
Re: S26 Draft
On 10/04/05 09:58 -0400, Aaron Sherman wrote: On Sun, 2005-04-10 at 14:02 +0300, Yuval Kogman wrote: Please don't be lazy, everyone, and look at this: http://svn.openfoundry.org/pugs/docs/ There are some more drafts that should be reviewed, and more will probably follow. Can we please be rid of: http://svn.openfoundry.org/pugs/docs/advocacy/phd.png It's just rude, and Perl's public face should never be one of rudeness. Applied, thanks.
Re: Aliasing swapped values
Ovid skribis 2005-04-10 10:47 (-0700): Apologies if this has been covered. What should this do? ($x,$y) := ($y,$x); It would let $x be a second name for the variable that is also called $y, and $y for $x. The old names $x and $y are overwritten, so essentially the names for the two variables swapped without copying or moving values around. This is assuming that bound variables are visible only after the entire bind expression is handled. Which would have to mean that the expressions for default values are special. ($c, $d) := ($y, $x); # later ($x,$y) := ($c, $d); # whoops! I imagine that that has the same effect as ($x, $y) := ($y, $x); ($c, $d) := ($x, $y); Of which I wonder if it can be written as ($c, $d) := ($x, $y) := ($y, $x); Juerd -- http://convolution.nl/maak_juerd_blij.html http://convolution.nl/make_juerd_happy.html http://convolution.nl/gajigu_juerd_n.html
