--- Log opened Mon May 10 00:00:56 2010
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00:36 < plexdev> http://is.gd/c1R53 by [Nigel Tao] in go/src/pkg/exp/draw/
-- exp/draw fast path for glyph images.
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04:16 < richardr> I see a lot of arguments passed in, or variables prefixed
with * - what exactly does this mean?  thanks
04:17 < jessta> richardr: they are pointers
04:18 < richardr> jessta: ah thanks.
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06:41 < manveru> could someone help me come up with a hashing function?
06:42 < manveru> it seems like map cannot take an array or slice as key, so
i'd like to create a key from two ints
06:42 < manveru> the order of the ints is important...  which kinda gives me
headaches
06:43 < manveru> and i'd rather not convert them to a string and run md5
over them if possible
06:43 < taruti> manveru: a string can be a key ;)
06:43 < manveru> hmm, wait, md5 wouldn't be needed, right?
06:43 < manveru> so something like key := Sprintf("%d,%d", a, b)
06:44 < manveru> ok...  but that's not very efficient, is it?
06:44 < KirkMcDonald> manveru: What kind of ints?
06:44 < KirkMcDonald> Just the "int" type?
06:44 < manveru> yeah
06:45 < manveru> they're x and y coordinates, so actually uint would do
06:46 < manveru> but map len is limited to int, afaik
06:46 < manveru> and i won't have that many elements anyway
06:48 < KirkMcDonald> My thinking being that you could take two uint32s and
turn them into a uint64.
06:48 < manveru> hmm
06:49 < manveru> uint64([]uint32{a, b}) ?
06:49 < KirkMcDonald> x : = uint64(a); x <<= 32; x += b
06:49 < KirkMcDonald> s/: =/:=/
06:49 < chressie> u := a<<32|b
06:49 < KirkMcDonald> Yeah!  That, too.
06:49 < manveru> heh
06:49 < KirkMcDonald> Well.
06:49 < KirkMcDonald> You might need uint64(a)
06:50 < manveru> yeah, i'd need that
06:50 < manveru> so bit shifting magic it is
06:50 < manveru> thank you very much...  my GC will send you cristmas cards
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06:54 < manveru> wonderful, no collisions anymore :)
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07:58 < taruti> Does anyone have a compiling version of gotags?
08:02 < yebyen> can someone look at this function for me?
08:02 < yebyen> or tell me something about go routines and how to make them
yield
08:02 < yebyen> http://paste.pocoo.org/show/212171/
08:02 < taruti> The one on the web refuses to compile
08:03 < yebyen> for some absurd reason, if I don't print a character inside
of this thread, it never yields...
08:04 < yebyen> the lock and unlock statements are correct, if I add the
print there is no problem, and all of my threads chug on merrily...  this is the
only bug I have left in my homework due wednesday :D
08:04 < taruti> yebyen: why would it yield?
08:04 < taruti> yebyen: why not message := <-ch.write ?
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08:05 < taruti> you are looping there for no reason
08:05 < yebyen> taruti: it looks that way from here, but this function gets
run once...
08:05 < yebyen> like this:
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08:05 < yebyen> go func() { fromUserToAll(ch) }()
08:05 < yebyen> oh
08:05 < yebyen> i see what you're saying
08:05 < yebyen> why not just block there
08:06 < yebyen> well, let me see if there's a reason...
08:06 < yebyen> yeah
08:06 < yebyen> because the data going into that channel is coming from a
websocket
08:06 < yebyen> well
08:06 < yebyen> hmm
08:07 < taruti> you don't want a busy-loop
08:07 < yebyen> i guess I just have to make sure it puts the empty string in
the channel when the function is meant to terminate
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08:08 < yebyen> I think that's why I added the busy loop
08:08 < yebyen> it's not in scope here, where I would put the empty string
into the channel
08:08 < yebyen> *fixes something*
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08:19 < yebyen> yep
08:19 < yebyen> that works great
08:19 < yebyen> thanks
08:19 < yebyen> no busy loop
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09:38 < adu> hi
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10:15 < manveru> taruti: yeah, i made one
10:16 < manveru> sent it to the author, but he didn't update it yet
10:16 < manveru> taruti: http://gist.github.com/390532
10:17 < taruti> manveru: already patched mine also.
10:17 < taruti> manveru: but thanks anyways.
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12:58 < richardr> Any video tutorials that go over the syntax of the Go
language briefly out there?
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13:50 < bortzmeyer> I do not find a way to have a time out while reading
from a channel.  Did I read the manual too fast?
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13:55 < uriel> bortzmeyer: that is not how channels work
13:55 < uriel> bortzmeyer: use another goroutine that sleeps and sends a
notification via an extra channel and a select
13:55 < bortzmeyer> I've just reread Hoare's book and _his_ channels have
timeout :-)
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13:56 < bortzmeyer> uriel: OK, as in
http://golang.org/doc/go_spec.html#Select_statements
13:56 * uriel doesn't see the sense of having channel timeouts
13:57 < uriel> bortzmeyer: yes, that is a select (also known as an 'alt' in
limbo lingo)
13:57 < bortzmeyer> Hoare sees it and he is Our Master :-)
13:58 < uriel> AFAIK the original CSP didn't have channels, or at least not
as a first class object, and you couldn't send channels down channels and things
like that
13:59 < richardr> Does anyone know if there are any brief video tutorials
that go over the syntax of the GO language out there?
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14:00 < uriel> richardr: did you watch rob's presentation?
14:00 < richardr> uriel: Nope, do you have a link?
14:00 < uriel> and really, what there is to go over?  reading the tutorial
doesn't take long, and the syntax is prety simple
14:00 < uriel> richardr: it is linked form the golang.org front page
14:00 * uriel sighs
14:00 < richardr> uriel: Oh, thanks heaps.
14:01 < uriel> richardr: it is under 'tech talk' on the menu
14:02 < uriel> (it really should have a more descriptive name and be more
prominent, i think)
14:02 < uriel> but note that some bits of the syntax have changed since that
talk was recorded, eg: you don't need any semicolons at all anywhere
14:02 < uriel> (but they are allowed, so the change is for the most part
backwards-compatible, just let gofmt be your guide)
14:02 < richardr> uriel: yeah sorry, i'm not sure how I missed that.  it is
a little hard to search for 'go' resources on Google.
14:03 < uriel> richardr: http://go-lang.cat-v.org/go-search
14:03 < richardr> Haha!
14:03 < richardr> Awesome.
14:03 < uriel> enjoy
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14:47 < damjan> hi, how do I merge two 'bytes' strings ?
14:48 < exch> check out bytes.Join()
14:51 < damjan> hm, Im a newb, so I have a var id, and I wan't to return a
[]bytes of the id concatenated with " some text\n"
14:51 < damjan> maybe I need bytes.Add
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14:53 < wrtp> anyone know what platform ideone runs on?
14:53 < exch> is 'id' a string?
14:53 < damjan> exch: id is a []bytes
14:54 < wrtp> damjan: then bytes.Add should do exactly what you want
14:55 < wrtp> bytes.Add(id, []byte(" some text\n"))
14:55 < damjan> seem I must convert " some text\n" to a ...
14:55 < damjan> right
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14:55 < exch> []byte("some text\n")
14:57 < damjan> cannot convert " \n" (type string) to type []uint8 in
conversion
14:57 < exch> are you using an old version of Go? Cos that should work
14:58 < damjan> ah..  it might be oldish :)
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15:10 < damjan> trying to compile a new version of Go
15:10 < damjan> /opt/go/bin/gotest: line 184: 24449 Killed $E ./$O.out "$@"
15:11 < damjan> this is under %% making cmd/hgpatch %%
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16:50 < jhh> I'm trying to parse a string to a date.  I'm getting the error
msg ` parsing time "2010-01-09.12-51-18 " as "%Y-%m-%d.%H-%M-%S ": cannot parse ""
as "%Y-%m-%d.%H-%M-%S " '
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16:50 < jhh> i don't understand what i'm doing wrong
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17:09 < jhh> oh, formats look like that: "2006-01-02.15-04-05"
17:09 < jhh> that is weired
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17:25 < kimelto> moin
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18:58 < allengeorge> Isn't '\' the source-code continuation character in Go?
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18:59 < allengeorge> How come I can't do myStruct :=
&MyStruct{Field:"value"\
18:59 < allengeorge> , Field2:"value", Field3:"value"}
19:04 < exch> you don't need the \
19:04 < exch> Just make sure the , is at the end of the previous line
19:06 < allengeorge> Ok, but let's say I wanted to split a single line of
code up, isn't '\' the way to do it?
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19:09 < exch> you can split lines up without a continuation character..  For
the most part at least.  Not sure there even is such a character
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19:13 < allengeorge> Interesting, I swear I saw the continuation character
in the initial Go video, in one of the constants; maybe it only applies in very
limited cases
19:14 < allengeorge> Thanks for your help exch
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19:20 < exch> there's been a fair few changes since that video was recorded.
But I may just not know about it.  Perhaps someone else can confirm
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19:40 < wrtp> allengeorge: you can use '\' as a continuation character
inside a double-quoted string
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20:17 < allengeorge> Thanks wrtp
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20:22 < fenicks> hello
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20:29 < smw> hi
20:31 < wrtp> has anyone got the profiler working under macos x
20:31 < wrtp> ?
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21:07 < Soultaker> if an interface defines only one method, is it possible
to pass a function as an instance of that interface?
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21:10 < kmeyer> you could make a struct that implements that interface and
forward the call to that function in the struct method, but basically: no.
21:11 < Soultaker> ah ok.  (that's basically what I do now, but I wondered
if I could get rid of the empty struct)
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21:47 < wrtp> Soultaker: methods can't be closures
21:48 < Soultaker> but alternatively, if I only want to be able to pass
functions, can I pass a function pointer?
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21:51 < KirkMcDonald> Soultaker: You can always type T func() and define
methods for T.
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21:56 < Soultaker> wrtp: not that I want to, but why not exactly?
21:56 < Soultaker> It seems trivial to translate a method to a closure
(func(arg int) int { return obj.method(int) })
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22:00 < wrtp> because that would mean inventing a new type.  you can't do
that (currently)
22:00 < wrtp> gotta go, sorry.
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22:01 < Soultaker> no problem.
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22:19 < Kirill> hi!  is there a library function that will let me read a
line from a reader, separated by "\n"?
22:20 < Ginto8> why would you want it separated by "\n"?
22:20 < Ginto8> you can just read in a line
22:20 < Kirill> Ginto8: how?
22:20 < Ginto8> and for i,v := range x {}
22:20 < Ginto8> lemme check
22:20 < Kirill> I looked in the packages, but didn't find a function that
would let me do this
22:21 < jlouis> Kirill: ReadSlice
22:21 < Ginto8> this should be similar to your problem:
https://groups.google.com/group/golang-nuts/browse_thread/thread/06cba14e7ca72749
22:23 < Kirill> jlouis: ah yes, perfect
22:36 < Kirill> I have a function that has an if/else statement, either
clause ends with "return".  go complains that the function itself doesn't end with
a "return" statement.  what am I doing wrong?
22:37 < Soultaker> I think this is an outstanding bug.
22:37 < Soultaker> (I run in this all the time.  Usually you can remove the
else clause to work around it.)
22:37 < Kirill> Soultaker: sheesh.
22:39 < Kirill> Soultaker: ternay operator would be nice =)
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22:46 < Kirill> are containers in go "goroutine-safe"?
22:46 < Kirill> that is, can I read and write a container from two different
goroutines simultaneously?
22:46 < Ginto8> there are mutexes for that I believe
22:47 < KirkMcDonald> Kirill: I believe that channels are intended to be the
primary means of inter-goroutine communication.
22:47 < KirkMcDonald> And so the other containers aren't designed to be
safe.
22:47 < KirkMcDonald> So, yeah, use a mutex.
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22:47 < Ginto8> Kirill, check this out: http://golang.org/pkg/sync/
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23:06 < jlouis> Kirill: containers are not safe no.  You should share it by
communication
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23:08 < kkress> Is there a reason why something like a BufferedReader that
lets you do getLine style ops on a Reader interface doesn't already exist as part
of an existing package?  Seems like a pretty common operation
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23:12 < Ginto8> well bufio.Reader.GetSlice() with '\n' as a parameter works
the same
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--- Log closed Tue May 11 00:00:56 2010