[#46049] [ruby-trunk - Feature #6590] Dealing with bigdecimal, etc gems in JRuby — "mrkn (Kenta Murata)" <muraken@...>
4 messages
2012/07/01
[#46078] [ruby-trunk - Feature #2565] adding hooks for better tracing — "mame (Yusuke Endoh)" <mame@...>
4 messages
2012/07/01
[#46108] Re: [ruby-trunk - Feature #2565] adding hooks for better tracing
— Aaron Patterson <tenderlove@...>
2012/07/02
On Mon, Jul 02, 2012 at 03:06:59AM +0900, mame (Yusuke Endoh) wrote:
[#46127] [ruby-trunk - Feature #2565] adding hooks for better tracing — "vo.x (Vit Ondruch)" <v.ondruch@...>
4 messages
2012/07/03
[#46160] [ruby-trunk - Feature #6693][Open] Don't warn for unused variables starting with _ — "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
15 messages
2012/07/04
[#46163] [ruby-trunk - Feature #6695][Open] Configuration for Thread/Fiber creation — "ko1 (Koichi Sasada)" <redmine@...>
7 messages
2012/07/04
[#46172] [ruby-trunk - Feature #6697][Open] [PATCH] Add Kernel#Symbol conversion method like String(), Array() etc. — "madeofcode (Mark Dodwell)" <mark@...>
7 messages
2012/07/04
[#46236] [ruby-trunk - Bug #6704][Open] Random core dump — "trans (Thomas Sawyer)" <transfire@...>
7 messages
2012/07/07
[#46248] building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06 — Perry Smith <pedzsan@...>
I am just now starting to debug this but hoped someone has already =
10 messages
2012/07/08
[#46251] Re: building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06
— Yutaka Kanemoto <kinpoco@...>
2012/07/08
Hi Perry
[#46252] Re: building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06
— Perry Smith <pedzsan@...>
2012/07/08
[#46254] Re: building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06
— Perry Smith <pedzsan@...>
2012/07/08
[#46259] Re: building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06
— Perry Smith <pedzsan@...>
2012/07/09
[#46266] Re: building ruby-1.9.3-p194 on AIX 6.1 TL05 SP06
— Yutaka Kanemoto <kinpoco@...>
2012/07/09
Hi Perry,
[#46262] [ruby-trunk - Feature #6710][Open] new special binding specifier :isolated — "ko1 (Koichi Sasada)" <redmine@...>
8 messages
2012/07/09
[#46276] Lambdaification of Method Calls — Robert Klemme <shortcutter@...>
Hi,
3 messages
2012/07/09
[#46320] [ruby-trunk - Feature #6721][Open] Object#yield_self — "alexeymuranov (Alexey Muranov)" <redmine@...>
25 messages
2012/07/11
[#46339] [ruby-trunk - Bug #6724][Open] waaaaaaant! ( — "zenspider (Ryan Davis)" <redmine@...>
11 messages
2012/07/11
[#46537] Re: [ruby-trunk - Bug #6724][Open] waaaaaaant! (
— Aaron Patterson <tenderlove@...>
2012/07/17
On Thu, Jul 12, 2012 at 08:58:36AM +0900, zenspider (Ryan Davis) wrote:
[#46540] Re: [ruby-trunk - Bug #6724][Open] waaaaaaant! (
— Luis Lavena <luislavena@...>
2012/07/18
On Tue, Jul 17, 2012 at 6:27 PM, Aaron Patterson
[#46377] [ruby-trunk - Feature #6727][Open] Add Array#rest (with implementation) — "duckinator (Nick Markwell)" <nick@...>
25 messages
2012/07/13
[#46420] [ruby-trunk - Feature #6731][Open] add new method "Object.present?" as a counter to #empty? — "rogerdpack (Roger Pack)" <rogerpack2005@...>
4 messages
2012/07/14
[#46500] [ruby-trunk - Feature #6739][Open] One-line rescue statement should support specifying an exception class — Quintus (Marvin Gülker) <sutniuq@...>
22 messages
2012/07/15
[#46535] [ruby-trunk - Bug #6749][Open] rdoc of Time class (incorrect explanation of leap seconds) — "stomar (Marcus Stollsteimer)" <redmine@...>
7 messages
2012/07/17
[#46687] [ruby-trunk - Bug #6749] rdoc of Time class (incorrect explanation of leap seconds)
— "drbrain (Eric Hodel)" <[email protected]>
2012/07/23
[#46713] Re: [ruby-trunk - Bug #6749] rdoc of Time class (incorrect explanation of leap seconds)
— sto.mar@...
2012/07/24
Hi Eric,
[#46734] Re: [ruby-trunk - Bug #6749] rdoc of Time class (incorrect explanation of leap seconds)
— Eric Hodel <[email protected]>
2012/07/24
On Jul 23, 2012, at 11:52 PM, [email protected] wrote:
[#46763] Re: [ruby-trunk - Bug #6749] rdoc of Time class (incorrect explanation of leap seconds)
— sto.mar@...
2012/07/25
Am 24.07.2012 19:44, schrieb Eric Hodel:
[#46546] Fwd: [ruby-cvs:43609] ko1:r36433 (trunk): * thread.c (rb_thread_call_without_gvl2): added. — SASADA Koichi <ko1@...>
Hi,
4 messages
2012/07/18
[#46547] Re: Fwd: [ruby-cvs:43609] ko1:r36433 (trunk): * thread.c (rb_thread_call_without_gvl2): added.
— Eric Wong <normalperson@...>
2012/07/18
SASADA Koichi <[email protected]> wrote:
[#46553] [ruby-trunk - Feature #2565] adding hooks for better tracing — "tenderlovemaking (Aaron Patterson)" <aaron@...>
4 messages
2012/07/18
[#46564] Ruby under CI - Windows — Luis Lavena <luislavena@...>
Hello,
6 messages
2012/07/20
[#46574] [ruby-trunk - Feature #6762][Open] Control interrupt timing — "ko1 (Koichi Sasada)" <redmine@...>
39 messages
2012/07/20
[#46575] [ruby-trunk - Feature #6762] Control interrupt timing
— "ko1 (Koichi Sasada)" <redmine@...>
2012/07/20
[#50542] Re: [ruby-trunk - Feature #6762][Open] Control interrupt timing
— Brent Roman <brent@...>
2012/12/03
I was suggesting "interruptible" as a better alternative for
[#46577] [ruby-trunk - Feature #6763][Open] Introduce Flonum technique to speedup floating computation on th 64bit environment — "ko1 (Koichi Sasada)" <redmine@...>
7 messages
2012/07/20
[#46586] [ruby-trunk - Bug #6764][Open] IO#read(size, buf) causes can't set length of shared string in trunk (2.0.0dev) — "nahi (Hiroshi Nakamura)" <nakahiro@...>
4 messages
2012/07/21
[#46641] [ruby-trunk - Bug #6780][Open] cannot compile zlib module, when cross-compiling. — "jinleileiking (lei king)" <jinleileiking@...>
14 messages
2012/07/23
[#46686] [ruby-trunk - Bug #6784][Open] Test failures related to numeric with x64 mingw — "h.shirosaki (Hiroshi Shirosaki)" <h.shirosaki@...>
5 messages
2012/07/23
[#46741] [ruby-trunk - Bug #6789][Open] parse.y compilation error due not updated id.h — "luislavena (Luis Lavena)" <luislavena@...>
8 messages
2012/07/24
[#46742] [ruby-trunk - Bug #6789][Assigned] parse.y compilation error due not updated id.h
— "luislavena (Luis Lavena)" <luislavena@...>
2012/07/24
[#46744] [ruby-trunk - Bug #6791][Open] ext/js on/generator/generator.c fails to compile on nightly build (AIX 6.1) — "pedz (Perry Smith)" <pedz@...>
4 messages
2012/07/25
[#46752] Re: [ruby-trunk - Bug #6791][Open] ext/js on/generator/generator.c fails to compile on nightly build (AIX 6.1)
— Yutaka Kanemoto <kinpoco@...>
2012/07/25
Hi Perry,
[#46772] Ruby 1.9.3 release? — Charles Oliver Nutter <headius@...>
JRuby will soon release 1.7.0pre2, the second preview of 1.7. Perhaps
6 messages
2012/07/25
[#46847] Re: Ruby 1.9.3 release?
— "NARUSE, Yui" <naruse@...>
2012/07/29
(2012/07/26 7:07), Charles Oliver Nutter wrote:
[#46864] Re: Ruby 1.9.3 release?
— Luis Lavena <luislavena@...>
2012/07/29
On Sat, Jul 28, 2012 at 10:59 PM, NARUSE, Yui <[email protected]> wrote:
[#46792] [ruby-trunk - Bug #6799][Open] Digest::*.hexdigest returns an ASCII-8BIT String — "Eregon (Benoit Daloze)" <redmine@...>
11 messages
2012/07/26
[#46832] [ruby-trunk - Bug #6807][Open] Can't compile ruby without ruby — "devcurmudgeon (Paul Sherwood)" <storitel@...>
13 messages
2012/07/28
[#46834] [ruby-trunk - Feature #6808][Open] Implicit index for enumerations — "trans (Thomas Sawyer)" <transfire@...>
15 messages
2012/07/28
[#46838] [ruby-trunk - Bug #6810][Open] `module A::B; end` is not equivalent to `module A; module B; end; end` with respect to constant lookup (scope) — "alexeymuranov (Alexey Muranov)" <redmine@...>
17 messages
2012/07/28
[#46854] [ruby-trunk - Feature #6811][Open] File, Dir and FileUtils should have bang-versions of singleton methods that fails silently — "prijutme4ty (Ilya Vorontsov)" <prijutme4ty@...>
7 messages
2012/07/29
[#46896] (Half-baked DRAFT) new `require' framework — SASADA Koichi <ko1@...>
Hi,
22 messages
2012/07/31
[#46897] Re: (Half-baked DRAFT) new `require' framework
— =?KOI8-R?B?4NLJyiDzz8vPzM/X?= <funny.falcon@...>
2012/07/31
2012/7/31 SASADA Koichi <[email protected]>
[#46899] Re: (Half-baked DRAFT) new `require' framework
— Alex Young <alex@...>
2012/07/31
On 31/07/12 13:29, SASADA Koichi wrote:
[#46902] Re: (Half-baked DRAFT) new `require' framework
— Trans <transfire@...>
2012/07/31
On Tue, Jul 31, 2012 at 12:07 PM, Alex Young <[email protected]> wrote:
[#46903] Re: (Half-baked DRAFT) new `require' framework
— Clifford Heath <clifford.heath@...>
2012/07/31
On 01/08/2012, at 5:59 AM, Trans wrote:
[#47040] Re: (Half-baked DRAFT) new `require' framework
— SASADA Koichi <ko1@...>
2012/08/07
(2012/07/31 21:29), SASADA Koichi wrote:
[#47054] Re: (Half-baked DRAFT) new `require' framework
— Rocky Bernstein <rockyb@...>
2012/08/07
If one is considering importing archive files like zip, tar, jar, or gem, I
[#47056] Re: (Half-baked DRAFT) new `require' framework
— Charles Oliver Nutter <headius@...>
2012/08/07
On Tue, Aug 7, 2012 at 8:48 AM, Rocky Bernstein <[email protected]> wrote:
[ruby-core:46732] [ruby-trunk - Feature #6636] Enumerable#size
From:
"marcandre (Marc-Andre Lafortune)" <ruby-core@...>
Date:
2012-07-24 15:26:53 UTC
List:
ruby-core #46732
Issue #6636 has been updated by marcandre (Marc-Andre Lafortune).
Hi,
mame (Yusuke Endoh) wrote:
> > I am proposing `Enumerator.new(size_lambda){ block }`, i.e. only if a block
> > is given, then the first argument can be a lambda/proc that can lazily
> > compute the size.
>
> This is just my guess, but matz will not like such a method whose
> meaning of its argument varies depending on whether block is given
> or not.
I understand the concern.
It could still be acceptable here because the other form is already documented as 'discouraged'. Maybe we should deprecate it?
Other possibility would be to add a different creator, e.g. `Enumerator.sized(size_lambda){|yielder| ... }`.
> > The old syntax of `Enumerator.new` without a block does not change meaning.
>
> Is it okay that there is no way to specify size in this case?
This old syntax is already discouraged and `to_enum`/`enum_for` should be used instead.
> > This is why I propose that `to_enum` accepts a block that can calculate the
> > size, and Enumerator.new with a block can accept a lambda/proc for the
> > same.
>
> What argument(s) will the lambda/proc receive?
We could consider passing the receiver and/or any arguments passed to `to_enum`, but I would propose to keep it simple and pass no arguments.
This is because enumerators are immutable and all information held in Enumerators should be accessible from the block/lambda anyways.
--
Marc-Andr辿
----------------------------------------
Feature #6636: Enumerable#size
https://bugs.ruby-lang.org/issues/6636#change-28400
Author: marcandre (Marc-Andre Lafortune)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 2.0.0
Now that it has been made clear that `Enumerable#count` never calls `#size` and that we have `Enumerable#lazy`, let me propose again an API for a lazy way to get the size of an Enumerable: `Enumerable#size`.
* call-seq:
* enum.size # => nil, Integer or Float::INFINITY
*
* Returns the number of elements that will be yielded, without going through
* the iteration (i.e. lazy), or +nil+ if it can't be calculated lazily.
*
* perm = (1..100).to_a.permutation(4)
* perm.size # => 94109400
* perm.each_cons(2).size # => 94109399
* loop.size # => Float::INFINITY
* [42].drop_while.size # => nil
About 66 core methods returning enumerators would have a lazy `size`, like `each_slice`, `permutation` or `lazy.take`.
A few would have `size` return `nil`:
Array#{r}index, {take|drop}_while
Enumerable#find{_index}, {take|drop}_while
IO: all methods
Sized enumerators can also be created naturally by providing a block to `to_enum`/`enum_for` or a lambda to `Enumerator.new`.
Example for `to_enum`:
class Integer
def composition
return to_enum(:composition){ 1 << (self - 1) } unless block_given?
yield [] if zero?
downto(1) do |i|
(self - i).composition do |comp|
yield [i, *comp]
end
end
end
end
4.composition.to_a
# => [[4], [3, 1], [2, 2], [2, 1, 1], [1, 3], [1, 2, 1], [1, 1, 2], [1, 1, 1, 1]]
42.composition.size # => 2199023255552
Example for `Enumerator.new`:
def lazy_product(*enums)
sizer = ->{
enums.inject(1) do |product, e|
break if (size = e.size).nil?
product * size
end
}
Enumerator.new(sizer) do |yielder|
# ... generate combinations
end
end
lazy_product(1..4, (1..3).each_cons(2)).size # => 8
lazy_product(1..4, (1..3).cycle).size # => Float::INFINITY
--
http://bugs.ruby-lang.org/