try.rakudo.org error

2011-01-04 Thread Dave Whipp
Is something wrong with the try.rakudo.org server? When I attempt to use it I get an alert box: An error has occured on the server. Error Message: Cannot connect to Rakudo Eval Server at /var/www/try.rakudo.org/frontend/try-rakudo.pl line 33.

Re: exponentiation of Duration's

2010-11-18 Thread Dave Whipp
On 11/17/2010 10:08 PM, Martin D Kealey wrote: Dimensioned numbers as restrictive types are useful, for uncovering bugs, including sometimes latent ones in ported code. Duration is a fairly clear example of a dimensioned quantity, and I think we should think twice about abandoning its

Re: Tweaking junctions

2010-11-01 Thread Dave Whipp
Buddha Buck wrote: Is it too late in this discussion to point out that, in non-perl usage, eigenstates are associated with the operator, not with the value fed into the operator? [cut] So asking for the eigenstates of a quantum superposition is asking the wrong object for the property.

Re: Tweaking junctions

2010-10-25 Thread Dave Whipp
Damian Conway wrote: Yes, Ted Z. pointed out to me that, as the name of this construct, every has ambiguity and synonym issues. Other possibilities are: select(@values) one(3..7) those(@values) one(3..7) whichever(@values) one(3..7) itemize(@values) one(3..7)

Re: Tweaking junctions

2010-10-22 Thread Dave Whipp
Damian Conway wrote: I've been thinking about junctions, and I believe we may need a small tweak to (at least) the jargon in one part of the specification. When this issue has been raised in the past, the response has been that junctions are not really intended to be useful outside of the

Re: threads?

2010-10-12 Thread Dave Whipp
Damian Conway wrote: Perhaps we need to think more Perlishly and reframe the entire question. Not: What threading model do we need?, but: What kinds of non-sequential programming tasks do we want to make easy...and how would we like to be able to specify those tasks? The mindset that I use

Re: Pragma to change presentation of numbers in Perl 6.

2010-09-02 Thread Dave Whipp
Matthew wrote: use base 16; my $a = 10; say $a; puts the number 0x10 into $a, and outputs `10'. Here, say $a.fmt('%d') would output `16'. As someone who has implemented, and used, mini-languages with such a feature, I'd say that the confusion that it would cause does significantly

Re: Suggested magic for a .. b

2010-07-28 Thread Dave Whipp
Michael Zedeler wrote: This is exactly why I keep writing posts about Ranges being defunct as they have been specified now. If we accept the premise that Ranges are supposed to define a kind of linear membership specification between two starting points (as in math), it doesn't make sense

Re: Suggested magic for a .. b

2010-07-28 Thread Dave Whipp
Moritz Lenz wrote: Dave Whipp wrote: for 0..10 - $x { ... } is treated as for (0...10).pick(*) - $x { ... } Sorry, I have to ask. Are you serious? Really? Ah, to reply, or not to reply, to rhetorical sarcasm ... In this case, I think I will: Was my specific proposal entirely

Re: Suggested magic for a .. b

2010-07-28 Thread Dave Whipp
Moritz Lenz wrote: I fear what Perl 6 needs is not to broaden the range of discussion even further, but to narrow it down to the essential points. Personal opinion only. OK, as a completely serious proposal, the semantics of for 0..10 { ... } should be for the compiler to complain sorry,

Re: Suggested magic for a .. b

2010-07-28 Thread Dave Whipp
Aaron Sherman wrote: On Wed, Jul 28, 2010 at 11:34 AM, Dave Whipp d...@dave.whipp.name wrote: To squint at this slightly, in the context that we already have 0...1e10 as a sequence generator, perhaps the semantics of iterating a range should be unordered -- that is, for 0..10 - $x

Re: Suggested magic for a .. b

2010-07-28 Thread Dave Whipp
Darren Duncan wrote: Dave Whipp wrote: Similarly (0..1).Seq should most likely return Real numbers No it shouldn't, because the endpoints are integers. If you want Real numbers, then say 0.0 .. 1.0 instead. -- Darren Duncan That would be inconsistent. $x ~~ 0..1 means 0 = $x = 1. The fact

[perl #76602] numeric types need conjugate operator

2010-07-21 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #76602] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=76602 (this is really a perl6 spec (S32) bug, not specifically rakudo ... but rakudo

Re: Parallelism and Concurrency was Re: Ideas for aObject-Belongs-to-Thread threading model (nntp: message 20 of 20 -lastone!-)

2010-05-17 Thread Dave Whipp
nigelsande...@btconnect.com wrote: There are very few algorithms that actually benefit from using even low hundreds of threads, let alone thousands. The ability of Erlang (and go an IO and many others) to spawn 100,000 threads makes an impressive demo for the uninitiated, but finding

Re: Parallelism and Concurrency was Re: Ideas foraObject-Belongs-to-Thread (nntp: message 4 of 20) threading model (nntp:message 20 of 20 -lastone!-)

2010-05-17 Thread Dave Whipp
nigelsande...@btconnect.com wrote: From that statement, you do not appear to understand the subject matter of this thread: Perl 6 concurrency model. If I misunderstood then I apologize: I had thought that the subject was the underlying abstractions of parallelism and concurrency that perl6

Re: Ideas for a Object-Belongs-to-Thread threading model

2010-05-12 Thread Dave Whipp
Daniel Ruoso wrote: Hi, The threading model topic still needs lots of thinking, so I decided to try out some ideas. Every concurrency model has its advantages and drawbacks, I've been wondering about this ideas for a while now and I think I finally have a sketch. My primary concerns were: 1

Re: optional rules cluttering parse trees

2010-04-28 Thread Dave Whipp
Moritz Lenz wrote: Am 27.04.2010 06:31, schrieb Stéphane Payrard: When doing an analyse of a sample parse tree, I note that it is cluttered by the reduction of optional subrules to generate a zero length parse subtree. That is, rules with a '?' quantifier matching zero time. Currently the ?

a more useful srand (was Re: r30369 - docs/Perl6/Spec/S32-setting-library)

2010-04-12 Thread Dave Whipp
masak wrote: Modified: docs/Perl6/Spec/S32-setting-library/Numeric.pod Log: [S32/Numeric] removed method form of srand Overwhelming consent on #perl6 about this. - multi method srand ( Real $seed: ) multi srand ( Real $seed = default_seed_algorithm()) Seed the generator Crand uses.

Re: a more useful srand (was Re: r30369 - docs/Perl6/Spec/S32-setting-library)

2010-04-12 Thread Dave Whipp
Moritz Lenz wrote: 1) A RNG class (don't really care what the name is, for now) 2) An instance of that in $*RAND (which you can temp()) 3) rand() and srand() act on $*RAND 4) It should be easy to create instances of the RNG to use in your own class. The sounds reasonable. The one thing I'd

[perl #71846] currying of prefix:! operator with !whatever_closure

2010-01-05 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #71846] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=71846 By principle of least surprise, all three of these should result in the same output

Re: Comments on S32/Numeric#Complex

2009-12-17 Thread Dave Whipp
Moritz Lenz wrote: Dave Whipp wrote: [cut] Contrast with Rat which has both separate accessors and the nude method (a name that could possibly be improved to avoid adult-content filters) suggestions welcome. Attempting to generalize: what we want is an operator that extracts a Seq

Re: Comments on S32/Numeric#Complex

2009-12-17 Thread Dave Whipp
Jon Lang wrote: my ($num, $denom) = $num.^attr; # $num.WHAT == Ratio; my ($mag, $phase) = Complex::Polar($z).^attr; my ($re, $im) = Complex::Cartesian($z).^attr; my ($x, $y) = $vector.^attr »·« ( [1, 0], [0, 1] ); If I'm reading this right, the .^attr is exposing implementation details

Re: Comments on S32/Numeric#Complex

2009-12-17 Thread Dave Whipp
Doug McNutt wrote: my ($x, $y) = $vector «·« ( [1, 0], [0, 1] ); After a while I became resigned to the fact that dot and cross products were not what was being offered. Instead a product of two vectors was to be simply a component by component multiply that produced another vector of the

Re: Comments on S32/Numeric#Complex

2009-12-17 Thread Dave Whipp
Todd Olson wrote: At 14:54 -0500 2009-12-17, Jon Lang wrote: And really, my whole point is that the implementation details are (conceptually) the only thing that distinguishes Complex::Polar from Complex::Cartesian. All though both e^(i ¼) and e^(i 3 ¼) evaluate to -1 + 0i it is often

Comments on S32/Numeric#Complex

2009-12-16 Thread Dave Whipp
The definition of the Complex type seems a little weak. A few things: To get the Cartesian components of the value there are two methods (re and im). In contrast there is just one method polar to return the polar components of the value I'm not sure that this asymmetry is a good thing.

Re: Comments on S32/Numeric#Complex

2009-12-16 Thread Dave Whipp
Moritz Lenz wrote: our multi method polar (Complex $nim: -- [ Real $mag where 0..Inf, Real $angle where -π ..^ π ]) is export { ... } If you put this into a signature, it is checked on every call to that method and thus slows down execution. If you want a formalization that's not part of

Re: Comments on S32/Numeric#Complex

2009-12-16 Thread Dave Whipp
yary wrote: At 00:15 +0100 12/17/09, Moritz Lenz wrote: Not quite, .abs returns one of the polar coordinates (the magnitude), so only a method is missing that returns the angle. Any ideas for a good name? Would a method called phi with a unicode synonym φ be too obtuse? Anything wrong

Re: Filename literals

2009-08-18 Thread Dave Whipp
Leon Timmermans wrote: Reading this discussion, I'm getting the feeling that filename literals are increasingly getting magical, something that I don't think is a good development. [...]. I don't want to deal with Windows' strange restrictions on characters when I'm working on Linux. I don't

Re: YAPC::EU and Perl 6 Roles

2009-07-08 Thread Dave Whipp
Ovid wrote: I'd like to see something like this (or whatever the equivalent Perl 6 syntax would be): class PracticalJoke does Bomb does SomeThingElse { method fuse() but overrides { ... } } The overrides tells Perl 6 that we're overriding the fuse() method from either Bomb or

Re: simultaneous conditions in junctions

2009-04-01 Thread Dave Whipp
Richard Hainsworth wrote: Thinking about Jon Lang's -1|+1 example in another way, I wondered about simultaneous conditions. Consider $x = any (1,2,5,6) How do we compose a conditional that asks if any of this set of eigenstates are simultaneously both 2 and 5? Clearly the desired answer

Re: junctions and conditionals

2009-04-01 Thread Dave Whipp
Jon Lang wrote: [proposal that conditional statements should collapse junctions] $x = +1 | -1; if $x 0 { say $x is positive. } else { say $x is negative. } I suspect that both codeblocks would be executed; but within the first block, $x == +1, and within the second codeblock, $x

Re: junctions and conditionals

2009-04-01 Thread Dave Whipp
Mark J. Reed wrote: [I] wrote: So I'd vote for going with simple semantics that are easy to explain -- that is, don't attempt implicit junctional collapse. Provide operators to collapse when needed, but don't attempt to be too clever. While it's easier to find clever programmers than to

Re: On Junctions

2009-03-27 Thread Dave Whipp
Richard Hainsworth wrote: The following arose out of a discussion on #perl6. Junctions are new and different from anything I have encountered, but I cant get rid of the feeling that there needs to be some more flexibility in their use to make them a common programming tool. I strongly agree

Re: On Junctions

2009-03-27 Thread Dave Whipp
[I’d been planning to put this suggestion on hold until the spec is sufficiently complete for me to attempt to implement it as a module. But people are discussing this again, so maybe it's not just me. I apologize if I appear to be beating a dead horse...] Jon Lang wrote: Maybe you could

Re: Recursive Runtime Role Reapplication Really Rebounds

2009-03-12 Thread Dave Whipp
Larry Wall wrote: Note however that coercions require parens these days, since types parse as values, not as routine names. $x = Role::Serializable::XML($resultset); $y = Role::Serializable::YAML($resultset); Should indirect object syntax work in this context?: $a = Foo: $value;

Statement modifiers as list comprehension operators

2009-03-02 Thread Dave Whipp
S04 mentions that statement modifiers behave as for perl5 (excpet that you can have both an conditional modifier and a looping modifier on a single statement. Both then it gives this example, with be modifiers being operators within an expression, not as modifiers of a statement. line

Re: Range and continuous intervals

2009-02-28 Thread Dave Whipp
Jon Lang wrote: Keys, OTOH, don't have any such requirement; so continuous keys may very well be doable. If they _are_ doable, you have to ask questions such as how do I assign values to a continuous interval of keys? To truly be robust, we ought also answer this question in terms of

Re: Temporal revisited

2009-02-20 Thread Dave Whipp
I'm getting a bit lost following precisely what's being proposed. What I'm sort of feeling is that there are two fundamental immutable types needed: Instants and Durations: multi sub infix:- (Instant, Instant -- Duration) multi sub infix:+ (Instant, Duration -- Instant) multi sub infix:-

Re: The use of roles in S16 (Was: Re: r25328 - docs/Perl6/Spec)

2009-02-17 Thread Dave Whipp
Daniel Ruoso wrote: Maybe I'm thinking sideways again, but I haven't thought of open as being a method of any IO object, because usually open is the thing that gets you an IO Object. I'd expect the plain open to be really a sub (maybe a is export method in the generic IO role), that does

Re: r25200 - docs/Perl6/Spec t/spec

2009-02-05 Thread Dave Whipp
Jon Lang wrote: Pattern to split on (used with -a). Substitutes an expression for the default split function, which is C{split ' '}. Accepts unicode strings (as long as Should the default pattern be ' ', or should it be something more like /\s+/? /ws/ ?

[perl #62742] man, max should accept code block that defines ordering

2009-01-25 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #62742] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=62742 According to S29, the min and max methods should accept the same ordering args

Re: design of the Prelude (was Re: Rakudo leaving the Parrot nest)

2009-01-23 Thread Dave Whipp
Darren Duncan wrote: I don't quite follow you. Are you saying your version of sqrt is an implicit declaration; maybe I don't understand how that differs from an explicit definition in this case? In any event, right at this moment I can't think of an answer to your question. Go ahead with

Re: RFD: Built-in testing

2009-01-23 Thread Dave Whipp
Timothy S. Nelson wrote: method foo() does assumeconserve_sum { ... } method bar() does ensureconserve_sum { ... } Is ensure equivalent to the assert that you describe above? Yes. does ensure was meant to be an englishification of postcondition; and does assume is precondition.

Re: RFD: Built-in testing

2009-01-23 Thread Dave Whipp
Larry Wall wrote: On Fri, Jan 23, 2009 at 08:01:14AM -0800, Dave Whipp wrote: For example, I could conceive of a trait: ok foo, :brokenrakudo which might downgrade the error to a warning on rakudo, but not on other implementations. On the surface that seems like a good idea, and pugs

Re: RFD: Built-in testing

2009-01-23 Thread Dave Whipp
Larry Wall wrote: module MyTests { sub group1 { ok foo :nametest_foo; ## Q - would a label be better? } } ## Elsewhere MyTests.group1.test_foo is also brokenrakudo; I guess I don't see offhand what you're trying to do with that. ... We must keep a clean separation

Re: RFD: Built-in testing

2009-01-23 Thread Dave Whipp
jerry gay wrote: i don't understand the drive to have unique test identifiers. we don't have unique identifiers for every code statement, or every bit of documentation. why are tests so important/special/different that each warrants a unique id? that aside, this functionality sounds like it can

Re: design of the Prelude (was Re: Rakudo leaving the Parrot nest)

2009-01-22 Thread Dave Whipp
Darren Duncan wrote: Dave Whipp wrote: sub sqrt(Num where { 0 = $_ = Real::Max } $x) { (0..$x/2 :by(Real::Epsilon)).min: { abs $x - $^candidate ** 2 } } So do you really mean as declarative a manner as possible? Or would you consider this example to go beyond possible? I would declare

Re: RFD: Built-in testing

2009-01-22 Thread Dave Whipp
Moritz Lenz wrote: A few months ago Larry proposed to add some testing facilites to the language itself, because we want to culturally encourage testing, and because the test suite defines the language, so we need to specify the behaviour of our testing facilities anyway. If we're going to

Re: RFD: Built-in testing

2009-01-22 Thread Dave Whipp
Moritz Lenz wrote: $x == 1e5 :ok('the :ok makes this is a test'); I can't help feeling that there's an end-weight problem here: The fact that it is a test is the essence of statement. If we're thinking of it as a library, then the MMD way of thinking might be appropriate: we know

Re: design of the Prelude (was Re: Rakudo leaving the Parrot nest)

2009-01-20 Thread Dave Whipp
Darren Duncan wrote: 1. What we *should* be doing with the Prelude, like with STD.pm, is write under the assumption that the implementation is also written in Perl 6. We should write the Prelude in as declarative a manner as possible, saying *what* we want to happen rather than how, such as

Re: [PATCH] Add .trim method

2009-01-12 Thread Dave Whipp
Ovid wrote: $string.trim(:leading0); $string.trim(:trailing0); Setting leading or trailing to false (they default to true) would result in either leading or trailing whitespace not being trimmed Alternatively, those could be ltrim() and rtrim(). If you need to dynamically determine

Re: returning one or several values from a routine

2009-01-07 Thread Dave Whipp
Jon Lang wrote: I believe that we already have a signature creation operator, namely :( @paramlist ). Yes, sorry, I missed that. ... Regardless, the magic that makes this work would be the ability to assign a flat list of values to a signature. Is this wise? We already have the ability

[perl #62028] say with no args should be an error

2009-01-06 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #62028] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=62028 S16 requires that say (and print) when called with no args should be a compile-time

Re: returning one or several values from a routine

2009-01-06 Thread Dave Whipp
Daniel Ruoso wrote: Hmm... I think that takes the discussion to another level, and the question is: what does a capture returns when coerced to a context it doesn't provide a value for? I'd like to take one step further, and ask what it is that introduced capture semantics in the first

Re: reporting bugs

2009-01-05 Thread Dave Whipp
Patrick R. Michaud wrote: On Sun, Jan 04, 2009 at 05:20:56PM +0300, Richard Hainsworth wrote: I posted an email to per6-all asking about how one should go about reporting bugs. That message has appeared on the list. So again: how can bugs be reported? See the Reporting bugs section of

rfc: The values of a junction

2009-01-05 Thread Dave Whipp
I spent a fair amount of time with Rakudo over the holiday break (see http://dave.whipp.name/sw/perl6 for the writeup). I was generally impressed with both the language and its implementation. There were, unsurprisingly, a bunch of things missing. Some of these were things that are in the

Re: rfc: The values of a junction

2009-01-05 Thread Dave Whipp
That doesn't solve the general problem: my $junc = any -4 .. Inf; my @domain = -Inf .. 4; my @values = @domain |==| $junc; say @values.perl [ -4 .. 4 ] How do you code that using grep? From: Daniel Ruoso dan...@ruoso.com To: Dave Whipp d

Re: rfc: The values of a junction

2009-01-05 Thread Dave Whipp
Daniel Ruoso wrote: my $concrete_value = max $junc_value.grep: { $^score 21 }; In the general case, both the junction and the domain may be infinite: my @domain = -Inf .. 3; my $junc = any -4 .. Inf; my @values = @domain |==| $junc; say @values.perl [-4..3] Handling all the variations

[perl #61988] $.foo doesn't accept args

2009-01-05 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61988] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61988 dwhipp rakudo: class A { method foo { say @_ }; method bar { $.foo(42) } }; A.bar

[perl #61916] initialization parameters from base classes

2009-01-02 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61916] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61916 The default new method allows values of attributes to be set as named args

[perl #61918] classes don't get a default .perl method

2009-01-02 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61918] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61918 dwhipprakudo: class A { has $.foo }; my A $a .=new( foo = 42 ); say

[perl #61894] lexicals not hoisted into classes

2009-01-01 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61894] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61894 example: dwhipppugs: my $global = 1; class A { method foo { say foo = $global

[perl #61898] defined-or-assign operator not implemented

2009-01-01 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61898] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61898 dwhipprakudo: my $a; $a //= 1 p6evalrakudo 34768: OUTPUT«get_iter

[perl #61892] list-comprehension assignments with declaration

2009-01-01 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61892] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61892 (rakudo 34751) I've been trying to figure out how to do a ($hd, @tl) = @list

[perl #61692] deep equality and junctions

2008-12-26 Thread Dave Whipp
# New Ticket Created by Dave Whipp # Please include the string: [perl #61692] # in the subject line of all future correspondence about this issue. # URL: http://rt.perl.org/rt3/Ticket/Display.html?id=61692 It's seems that Rakudo's notion of equality under the === operator doesn't handle

Re: Working with files wish list

2008-12-15 Thread Dave Whipp
Leon Timmermans wrote: On Mon, Dec 15, 2008 at 5:43 PM, Richard Hainsworth rich...@rusrating.ru wrote: a) I am fed up with writing something like open(FP, ${fname}_out.txt) or die Cant open ${fname}_out.txt for writing\n; The complex definition of the filename is only to show that it has to

Re: how to write literals of some Perl 6 types?

2008-12-06 Thread Dave Whipp
Carl Mäsak wrote: Paul (): I can't find anything in the existing synopses about Blobs. Probably looking in the wrong place, sorry. http://perlcabal.org/syn/S02.html#line_912 Re-reading that, a slightly tangent (though still on topic, I hope) thought come to mind. The definition of the

Re: S16: chown, chmod

2008-11-25 Thread Dave Whipp
Brandon S. Allbery KF8NH wrote: Still misunderstanding, I think. Yes, it will fail anyway, but in the general case you're checking to see if as a privileged process it is safe to operate on a given file. I'd actually been thinking that one would use the check in the opposite direction:

Re: S16: chown, chmod

2008-11-21 Thread Dave Whipp
The restriction of chown to the superuser is a property of the OS, not the files. The example from the pod is: use POSIX qw(sysconf _PC_CHOWN_RESTRICTED); my $can_chown_giveaway = not sysconf(_PC_CHOWN_RESTRICTED); Thinking about it, perhaps that means that it's a method on $*OS. The use of

Re: S16: chown, chmod

2008-11-21 Thread Dave Whipp
Larry Wall wrote: On Fri, Nov 21, 2008 at 11:46:48AM -0800, dpuu wrote: : before I attempt to change the POD, would this wording be appropriate? It's a good first whack, though we might want to think about making it a little less P5ish/Unixish in changing a list of files, and rely instead of

perldoc doesn't use $(PERLDOC) in docs/Makefile

2008-09-25 Thread Dave Whipp
I was attempting to build parrot (0.7.1 release), but got a failure in the docs directory because perldoc was not in my path. Looking at the Makefile I see that it sets PERLDOC := my-perl-path/perldoc, but uses perldoc in a rule. I think this is due to:

how much detail can I get from caller.want?

2008-08-29 Thread Dave Whipp
Lets say I want to find the 5th smallest element in an array. I might write: @array.sort.[4]; How does the implementation of the sort function know that I just want to 5th item (and thus choose an appropriate optimization)? Obviously the function could be told that it's caller wants 5

Re: meta_postfix:*

2008-07-15 Thread Dave Whipp
Jon Lang wrote: So you're suggesting that A op* n should map to [op] A xx n I don't think that that mapping works for Thomas' proposal of a repetition count on post-increment operator. I.e. $a ++* 3 is not the same as [++] $a xx 3 (which I think is a syntax error) and also

Re: Fatal/autodie exception hierarchies for Perl 5

2008-06-04 Thread Dave Whipp
Larry Wall wrote: On Wed, Jun 04, 2008 at 10:42:33AM -0400, Mark J. Reed wrote: : However, I think we are now officially *way* off topic for Perl6... Not really--a Klingon army is a *parallel* processor, and just because one Klingon dies doesn't mean the whole army should suddenly die too.

Re: assignable mutators (S06/Lvalue subroutines)

2008-05-27 Thread Dave Whipp
TSa wrote: TSa wrote: class Length { has Num $.mm is rw = 0; method inch { yield $inch = $.mm * 25.4; self.mm = $inch / 25.4; } } Would you regard that as elegant? That looks functionally incorrect to my eyes: if the caller resumes

Re: First look: Advanced Polymorphism whitepaper

2008-05-01 Thread Dave Whipp
Brandon S. Allbery KF8NH wrote: But there *is* some commonality there, to the extent that both are motion. This is the kind of thing that spawned this discussion, in fact: if what matters is motion, there is no reason *not* to substitute one for the other. { draw $gun }: makes a big

Re: given vs for

2008-04-25 Thread Dave Whipp
Mark J. Reed wrote: So eseentially, given (@foo) means the same as Perl5 for ([EMAIL PROTECTED]) Just wondering: should given @foo {...} alias to $_, or @_?

Re: given vs for

2008-04-25 Thread Dave Whipp
Smylers wrote: Dave Whipp writes: So eseentially, given (@foo) means the same as Perl5 for ([EMAIL PROTECTED]) Just wondering: should given @foo {...} alias to $_, or @_? I'd expect it to alias to C$_, on the grounds that everything always aliases to C$_. What's the argument

Re: given vs for

2008-04-25 Thread Dave Whipp
Mark J. Reed wrote: The topic should always be $_ unless explicitly requested differently via the arrow. Now in the case of for, it might be nice if @_ bound to the entire collection being iterated over (if any)... As a perl5-ism: sub foo { say @_; } ... given (@bar) { when ... { foo }

S12 delegation (handles trait)

2008-04-18 Thread Dave Whipp
I noted Jonathan Worthington's work implementing the handles trait for delegation through attributes, and was a bit surprised to see that it is defined (S12/delegation) to use strings instead of method signatures -- I had thought that perl6 was attempting to be symbolic in places where perl5

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-11 Thread Dave Whipp
Matthew Walton wrote: I wouldn't agree with that at all. I think of arrays as ordered constructs, so I'd want the default iteration over my array to happen in the order of the indices. I guess that depends on whether you think of the array as a list or as a ram. I know that a group at

Can assignment meta-operator be combined with feed operators?

2008-01-11 Thread Dave Whipp
S06 says that we need to say eager if (@in === @out). So: @data == eager map { $^x + 1 } == @data. Is it possible to modify a feed operator using the assignment meta-operator described in S02 and, if so, is the eager implict? @data === map { $_ + 1 };

Re: Can assignment meta-operator be combined with feed operators?

2008-01-11 Thread Dave Whipp
Larry Wall wrote: As for assignment-op forms, in the current STD grammar, feeds are not currently even considered operators, but statement separators, so there is no possibility of using them in an assignment metaoperator (or any other metaoperator, for that matter). Feeds as a reduction

S02 interpolation of entire hashes

2008-01-07 Thread Dave Whipp
The tests in S02 LS02/Literal/In order to interpolate an entire hash appear to assume that an interpolated hash renders its keys in a sorted order. But this property doesn't seem to be stated in the text. Is it true that the keys are always sorted for interpolation? (is it possible, in P6, for

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-04 Thread Dave Whipp
Luke Palmer wrote: forall was about concurrency, not order of evaluation. There is a difference between running in an arbitrary order serially and running in parallel. for %bag { .say; } If the bag had elements hello, world, I think printing: helworld lo Would

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-04 Thread Dave Whipp
Mark J. Reed wrote: Am I the only one having bad flashbacks to Occam, here? (Transputing Will Change Everything!) My $0.02, FWIW: Concurrency is surprising. Humans don't think that way. And programs aren't written that way - any program represented as a byte stream is inherently sequential

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-04 Thread Dave Whipp
Larry Wall wrote: It's really, really easy to misdesign a computer language by overemphasizing one particular design dimension to the detriment of others. I agree that adding a parallel forall (and similar statements) via a pragma will be easy if the appropriate underlying machinery is

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-04 Thread Dave Whipp
Larry Wall wrote: my hope is that we can delegate locking entirely to the innards of the implementation and never mention it at all on the language level. Hmm, sounds to me analogous to hoping that type inference will avoid the need to expose type-annotations at the language level

Re: Sequential bias in S04 (and Perl6 in general)

2008-01-03 Thread Dave Whipp
Moritz Lenz wrote: You can achieve that with the hyper list-op (see S02). Also note that an optimizer is free to automatically add the hyper list op if it can prove that the executed block has no side effects. Yes, there are some places where things are better than others, which is why I

Sequential bias in S04 (and Perl6 in general)

2008-01-02 Thread Dave Whipp
I was reading Synopsis 4 with regards to multi core programming. It seems to be infused with a bias towards non-parallel models of computation. Concurrently appears to be an add-on feature -- whereas we should have a mindset that explicit sequential constraints are the add-on feature. Two

Re: Concerns about {...code...}

2007-12-21 Thread Dave Whipp
Larry Wall wrote: As for the Q base form, it's not really there so much for end-use, For an operator not intended for end use, it has a remarkable low Huffman rank...

Re: Concerns about {...code...}

2007-12-21 Thread Dave Whipp
Chas. Owens wrote: On Dec 21, 2007 4:51 PM, Dave Whipp [EMAIL PROTECTED] wrote: Larry Wall wrote: As for the Q base form, it's not really there so much for end-use, For an operator not intended for end use, it has a remarkable low Huffman rank... But since it will be combined with adverbs

Re: xml and perl 6

2007-11-29 Thread Dave Whipp
cdumont wrote: By listening to you all, we shouldn't even think to implement file access... I think I'd argue that most file-access features should indeed be considered non-core. This doesn't mean that we shouldn't think to implement them -- or that they wouldn't be part of almost every Perl-6

Re: xml and perl 6

2007-11-29 Thread Dave Whipp
cdumont wrote: By listening to you all, we shouldn't even think to implement file access... I think I'd argue that most file-access features should indeed be considered non-core. This doesn't mean that we shouldn't think to implement them -- or that they wouldn't be part of almost every Perl-6

Re: Project Idea: Perl 6 Syntax Explainer

2007-07-10 Thread Dave Whipp
Steffen Schwigon wrote: Do you think it's possible to extract and collect all the operators and descriptions from the synopses into one common place? The problem with that is that it wouldn't scale to user-defined operators/macros. I think the way to approach it would be to define a POD6

Re: Project Idea: Perl 6 Syntax Explainer

2007-07-10 Thread Dave Whipp
Moritz Lenz wrote: You're probably right about that, but somebody who writes his own macros and operators probably doesn't need such a tool anyway. And should write very good documentation, otherwise he has lost outright. (I was thinking that your tool would provide a mechanism for them to

Re: t/codingstd/perlcritic.t needs to be optional

2007-06-28 Thread Dave Whipp
Andy Lester wrote: Modified since when? It'd have to be against the last update from svn of the file itself. I'm not sure I like the idea of relying on a given VCS. I know Parrot's hosted in Subversion, but what about the Git folks? Perhaps a better approach is to squirrel away an MD5 of

Re: = at Start of Line ... solution is simple

2007-06-16 Thread Dave Whipp
Darren Duncan wrote: Given this, there is an obvious (to me) solution for pod blocks in the middle of expressions like: my $foo = $bar; As the example shows, and I believe best practices espouse, you *indent* the code line with a leading =. I'd agree that indentation is good for

Re: explicit line termination with ;: why?

2007-05-15 Thread Dave Whipp
Jonathan Lang wrote: Close. I'm thinking added functionality for semicolon alternatives rather than the replace the semicolon stunt that Semi::Semicolons pulls. In particular, as long as there's no ambiguity between prefix:? and postfix:?, I think that it would be quite useful for postfix:?

Coercion of non-numerics to numbers

2007-03-05 Thread Dave Whipp
I was wondering about the semantics of coercion of non-numbers, so I experimented with the interactive Pugs on feather: pugs +42 42.0 pugs +x42 0.0 I assume that pugs is assuming no fail in the interactive environment. However, Is 0.0 the correct answer, or should it be one of undef, or NaN?

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