--- Log opened Mon Jan 04 00:00:22 2010
--- Day changed Mon Jan 04 2010
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00:03 < rah_> blind leading the blind, but from what ive seen, yes
00:06 < jessesanford> haha thank you much
00:06 < jessesanford> i just answered all my questions
00:06 < jessesanford> very newb and i appreciate your patience
00:07 < goplexian> I need a go/ast guru
00:08 < goplexian> I've parsed in a go file, and I'm ranging over the top
level decl's and I would like to print the line that each decl appears on in the
original source, for example a decl would be "main" and the line it appears on
would be "fun main() {" ..any suggestions?
00:09 < rah_> hmm...
00:10 < rah_> does Pos() give you a source position?
00:13 < goplexian> rah_: hmm let me try that I've just been using
token.Position
00:14 < rah_> i think Pos() returns a token.Position, so not sure if it'll
buy you anything more than what you have..
00:15 < goplexian> Pos() returns the line number and the name of the source
file
00:15 < rah_> is that what you were looking for?
00:16 < goplexian> kind of, see I'm not opening the file for reading I'm
just using go/parser, so I only have the info that the parser gives me and I'm
trying to get it to give me the information which is on that line number
00:16 < goplexian> it gives me the name of the decl but not the entire line
00:16 < rah_> ah, i see
00:17 < rah_> you may just have to bust open the file and return that line
number
00:17 < rah_> if that is an option
00:17 < goplexian> yeah i was thinking I might have to do that, but seems a
waste to parse a file and then have to open it and read it again anyway
00:18 < rah_> true
00:18 < goplexian> I know the info is there >.>
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00:24 < rah_> hm, i'm not sure how to get at it, if it's there...
00:25 < goplexian> hmm
00:36 < jessesanford> ok i have another pointer question
00:36 < jessesanford> ;)
00:37 < jessesanford> if I am creating a static method to simply compare two
integers
00:37 < jessesanford> and I have created a type called namelength based on
int
00:37 < jessesanford> type namelenth int
00:38 < jessesanford> would this be appropriate?
00:38 < jessesanford> func (first_int *namelength)
NumCommonFactors(second_int *int) int {
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00:43 < rah_> what does NumCommonFactors do?
00:43 < jessesanford> it just figures out the number of common factors
between two integers
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00:44 < jessesanford> i am just playing around i have two lists of names
00:44 < rah_> ahh
00:44 < rah_> i'd think just make a NumCommonFactors(first int, second int)
int?
00:44 < jessesanford> i want to extend the string object so that it can
compute the number of common factors between the current (this) instances length
and any other strings length
00:45 < jessesanford> so i can ask my new string object
00:45 < rah_> ah
00:45 < jessesanford> what is the number of common factors you have with
"blah"
00:45 < rah_> so common factors on strings would be substrings that both
contain?
00:46 < jessesanford> sure its more the mathematical equivalent but thats
kind of the idea
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00:46 < jessesanford> should i paste the buffer here
00:46 < rah_> or pastebin.com
00:46 < goplexian> no paste it to a website
00:47 < jessesanford> ok
00:47 < jessesanford> http://pastebin.com/d5011db6d
00:48 < jessesanford> it really could just take in two integers i am only
trying to attach it to string objects
00:48 < jessesanford> and it could be a static library function
00:48 < jessesanford> like i said this is just for fun
00:48 < rah_> gotcha
00:49 < rah_> i'd say the more general you can make it, the better chance
you can reuse it in the future
00:49 < rah_> so if you can get away with just ints, i would :)
00:49 < jessesanford> yeah but i wont...  this is all throw away ;)
00:49 < rah_> haha
00:49 < jessesanford> i want to play with the mixin esque features
00:49 < jessesanford> of the language
00:49 < rah_> i gotcha
00:49 < jessesanford> and overriding strings and creating new methods for
them is interesting
00:50 < rah_> i'd say in that case just experiment and try lots of wacky
stuff :)
00:50 < goplexian> I prefer adding funcs to structs, not to generic types
like ints
00:50 < jessesanford> yeah i agree..  i would never do this in the real
world...  its just interesting that it can be done
00:51 < jessesanford> so anyway this function is on ints not on strings
00:51 < jessesanford> and it takes itself and another integer and divides
them by every number less than the smallest of the two.  figures out how many
divisors they have in common
00:51 < jessesanford> that create whole numbers
00:52 < jessesanford> i cant see any reason why not to just operate on the
pointers to the original ints
00:52 < jessesanford> it doesnt actually change their values
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00:53 < jessesanford> but i am new to the idea of pointers etc and so i am
not sure i can compare them with operators like > and < wouldnt that be
comparing their addresses in memory
00:54 < jessesanford> and if so i would in essence be comparing the wrong
values and essentially dividing memory locations
00:54 < jessesanford> as you can see i don't have strong foundation in
systems languages
00:55 < jessesanford> func (first_int *namelength)
NumCommonFactors(second_int *int) int {
00:55 < jessesanford> if first_int <= 0 || second_int <= 0 {
00:56 < jessesanford> or in the above two lines does first_int actually
resolve to the value of the int that the pointer references?  in which case the
comparison to 0 would be correct?
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01:00 < jessesanford> this is the ultimate goal
01:00 < jessesanford>
len(pa.A.Advertiser_name).(namelength).NumCommonFactors(len(pa.P.Person_name))
01:00 < jessesanford> and i think i just answered my own question
01:01 < jessesanford> because len is going to return an integer value...
not a pointer
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01:03 < jessesanford> unless i can do this?
&len(pa.A.Advertiser_name).(namelength).NumCommonFactors(len(pa.P.Person_name))
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02:07 < goplexian> I forget which channel includes the go eval robot, does
anyone know off hand?
02:07 < goplexian> irc channel i mean
02:10 < XenoPhoenix> goplexian: if you do fine out let me know that could be
quite handy :)
02:11 < goplexian> yeah it is, there was only i think 10 people there last
time, so I guess it might be gone, not sure
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02:22 < goplexian> how does bytes.map work, can anyone give me a quick
example?
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02:43 < goplexian> so quiet...
02:44 < jackman> indeed
02:44 < goplexian> hey jackman!
02:44 < jackman> hey!
02:44 < jackman> what's up?
02:44 < goplexian> meh nothin much
02:44 < jackman> i've been monitor, but ihaven't been able to contribute
much.
02:44 < jackman> *monitoring
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04:17 < goplexian> jackman: ping
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07:28 < trevor> Hi, I'm new to Go and afraid I'm doing something dumb.
http://gist.github.com/268383 The code is at top and the error at bottom
07:28 < trevor> I'm not sure if I'm using slices/arrays wrong, or using the
net pkg wrong
07:29 < quag> hi trevor
07:29 < trevor> hey quag
07:30 < trevor> Trying to pick Go up.  Not going so well right now :)
07:31 < quag> trevor: the new([50]byte), I think that should be make([]byte,
50)
07:33 < anticw> it depends what you mean
07:33 < trevor> Hmm, I thought make just made a slice.  Would that also give
me 50 bytes to store things in?
07:33 < anticw> do you wan a slice or an array?
07:33 < quag> trevor: actually, that code doesn't segfault for me
07:34 < trevor> anticw: I just want to print out the first thing a tcp
connection writes into my server
07:34 < trevor> I'm not sure about the go specifics yet
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07:34 < anticw> trevor: it should work either way
07:34 < trevor> quag: Hmm, so maybe the error is in the net pkg's osx
implementation?
07:35 < trevor> quag: Still on linux, I'm assuming?
07:35 < quag> trevor: this test is on osx
07:35 < quag> :)
07:35 < anticw> trevor: you don't need [0:49
07:35 < anticw> trevor: you don't need [0:49]
07:36 < trevor> anticw: I think I put that there because I thought just b[]
was causing the seg fault
07:36 < anticw> Read(b) will work
07:37 < trevor> I get a segfault still :\
07:37 < anticw> that stack trace looks odd
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07:37 < anticw> this is os x 32-bit?
07:37 < anticw> oh, 64-bit
07:37 < trevor> I'm building with 6g
07:38 < trevor> The docs said that was the most stable or something
07:38 < anticw> it should be fine
07:40 < anticw> trevor: print the errors out
07:40 < anticw> where you have foo, _ := ....
07:40 < anticw> you might be getting and error (ie.  can't listen)
07:40 < trevor> Oh, good thinking
07:41 * quag waits to be told what the error is :)
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07:44 < trevor> "e1: lookup localhost.: no such host"
07:44 < trevor> Why in the world wouldn't I have a localhost
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07:44 < trevor> let me try 127.0.0.1
07:44 < anticw> trevor: ok, known issue ...  i have a patch for that
07:44 < trevor> Well that worked
07:44 < trevor> heh
07:44 < anticw> http://codereview.appspot.com/181063/show
07:45 < anticw> grab the patch from that and you should be fine
07:45 < anticw> http://codereview.appspot.com/download/issue181063_8.diff
07:45 < anticw> that
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07:45 < quag> anticw saves the day :)
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07:45 < trevor> sure does
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07:46 < anticw> i have an updated patch actually, but it's not important
right now...  the issue got somewhat side-tracked and confused by nss comments and
also caching ideas and some other noise, but that as-is will work for you
07:46 < trevor> anticw: Thanks :)
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07:46 < anticw> np
07:47 < Claviceps> www.ps4insider.com
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08:26 < napsy> Hello.  I have a strange problem when going through the DOM
tree.  There are elements that are mission some attributes that are given in the
HTML documents.  For example I canot find my custom attrbute my_attr="some_value"
inside the <img> tag.  Any idea why this is happening?
08:27 < napsy> *missions
08:27 < napsy> *missing
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13:47 < sowa> Anyone gone nuts yet?
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15:04 < clip9> napsy: you can't use custom attributes like that.
15:04 < clip9> or at all in html.
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16:35 < taruti> is it possible to refer to C size_t type in a portable way
from Go?
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16:40 < dho> You're using cgo?
16:46 < taruti> dho: no, plain go.
16:46 < taruti> dho: trying to write a wrapper for a new syscall.
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16:48 < dho> oh, the ioctl with NIOFREAD?
16:49 < taruti> dho: writev
16:49 < dho> ok
16:50 < taruti> and thus I need type iovec struct { iov_base *byte; iov_len
like_c_size_t }
16:51 < dho> well, writev returns ssize_t too
16:51 < dho> in any case, those are either int64 or uint64
16:51 < dho> for ssize_t or size_t respectively
16:51 < dho> and if you need the iovec struct, you shouldn't wrap it
manually
16:52 < dho> you should pull it from the header files that are generated
with godefs in the syscall package
16:52 < dho> types_$GOOS.c
16:52 < dho> you would want something like:
16:52 < dho> typedef struct iovec $Iovec;
16:53 < chickamade> was there any improvement made on the scheduler since
the first release?
16:53 < dho> No, there has been no significant work on the scheduler
16:54 < chickamade> b/c I just revisted a program I wrote and it is running
150% faster :)
16:54 < taruti> dho: ok, haven't used godefs much, will try to learn that.
16:54 < chickamade> which is lovely
16:54 < dho> taruti: There's not really that much to do
16:55 < dho> taruti: the tough part will be you getting a linux / darwin /
freebsd machine
16:55 < dho> :)
16:55 < chickamade> that's very interesting
16:55 < chickamade> well something has improved
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16:56 < dho> There have been some optimizations in the 6g compiler toolchain
and some work on memory allocation and garbage collection, as well as some
performance improvements for channels by removing a BGL for channels
16:56 < dho> taruti: the input for godefs is just straight C
16:57 < chickamade> dho: BGL = some kind of lock?
16:57 < rog> "
16:57 < chickamade> that would explain it
16:57 < rog> "big global lock"
16:57 < dho> yes, a `big giant lock'
16:57 < dho> or that
16:57 < chickamade> really
16:57 < dho> yeah
16:57 < chickamade> what does it do?
16:57 < dho> synchronizes communication between channels
16:57 < chickamade> (I'm having GIL nightmare)
16:58 < dho> GIL is python's term for bgl, indeed
16:59 < dho> taruti: I've worked with the syscall package somewhat
extensively (for the freebsd port) so if you have any questions feel free to ask
17:00 < chickamade> It makes sense to have a global lock for every channel,
but why is this called *BIG*?
17:00 < dho> Because it's effectively `fat'
17:01 < chickamade> lol
17:01 < dho> it `consumes' every resource that depends on it
17:01 < chickamade> but it's gone now?
17:01 < dho> so if you have a lock around an entire subsystem (or system in
general for the case of e.g.  freebsd 5, or python), it's `big'
17:02 < dho> sometimes a big lock is what you need, usually more
finer-grained locks are better
17:02 < dho> However, if you have too many, you spend a lot of time locking
/ unlocking tons of data structures
17:02 < dho> so it's sort of a `try it and see' sort of trade-off
17:02 < dho> but yes, that code was committed before one of the last two
releases
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17:05 < chickamade> how come I can't grep anything like BGL,
[Gg]lobal.[Ll]ock from the source tree
17:05 < dho> it's a generic term
17:06 < chickamade> ic
17:07 < dho> i think iant did that work
17:07 < dho> hm, no was agl
17:08 < dho> http://codereview.appspot.com/166043
17:08 < chickamade> thanks
17:09 < chickamade> I was looking for that
17:09 < chickamade> who is agl, btw?
17:10 < dho> adam langley
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18:45 < plexdev> http://is.gd/5M6ZU by [Roger Peppe] in go/src/pkg/go/ast/
-- Allow a nil Ident to print without crashing.
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19:33 < x10> Hi, guys
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19:34 < x10> Can someone point me to a list of libraries available?
19:34 < x10> I want to make a primitive web site
19:35 < ShadowIce> x10: http://go-lang.cat-v.org/
19:35 < x10> Thanks :)
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19:40 < Olathe> If I do a := true on a line before a for statement, I get an
error.  If I put a := true; it works.  Why ?
19:40 < dho> huh?
19:40 < dho> a := true or a ``:= true''
19:40 < Olathe> The first
19:41 < dho> can you paste context?
19:41 < Olathe> Maybe x := true is clearer
19:41 < dho> yeah, sorry
19:41 < dho> ambiguity--
19:42 < Olathe> http://pastebin.com/d307ac172
19:42 < Olathe> The first one fails, the second compiles
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19:43 < Olathe> Bah.
19:43 < dho> the former works fine for me
19:44 < Olathe> Hmm...
19:44 < dho> http://pastebin.com/d602cd85b
19:44 < dho> compiles great
19:44 < Olathe> Must be this evil Windows binary.
19:44 < dho> oh, you're using hectorchu's windows port?
19:44 < Olathe> Yeah.
19:44 < dho> The current state of that is `waiting to get merged into the
mainline'
19:45 < Olathe> Ahh, OK
19:45 < dho> I'm not sure it has all the most recent changes, so he may not
have bothered with the semicolon change
19:45 < Olathe> Oh, OK
19:45 < dho> since that's not really a platform-specific anything that he'd
have needed to worry about
19:45 < Olathe> Hmm...
19:45 < Olathe> I hope that gets integrated soon, then.
19:46 < dho> it's getting there
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19:46 < dho> http://codereview.appspot.com/176066
19:46 < dho> hey me__
19:47 < Olathe> Ahh, thanks :)
19:47 < dho> no problem
19:48 < x10> hey, I have a weird "import" bug
19:48 < x10> has someone seen this before?
19:49 < dho> seen what
19:49 < x10> fatal error: can't find import:
bytesbufioencoding/binaryfmtiolognetos
19:49 < dho> ah
19:49 < x10> It merges all the imports into one
19:49 < dho> paste code?
19:49 < x10> (I'm on Linux)
19:49 < x10> import (
19:49 < x10> "bytes"
19:49 < x10> "bufio"
19:49 < x10> "encoding/binary"
19:49 < x10> "fmt"
19:49 < x10> "io"
19:49 < x10> "log"
19:49 < x10> "net"
19:49 < x10> "os"
19:49 < x10> )
19:49 < x10> is it some \r\n thing?
19:50 < dho> don't believe so
19:50 < dho> any way you can make the package available?
19:50 < dho> (A simple test of that succeeds for me)
19:50 < x10> what do you mean?
19:50 < x10> oh, sorry
19:50 < x10> http://github.com/hoisie/web.go#
19:50 < Gracenotes> x10: try semicolons
19:50 < dho> alright
19:51 < Gracenotes> consecutive string literals are combined
19:51 < Gracenotes> otherwise
19:51 < x10> uhhh
19:51 < x10> So...why has this been released, then?
19:51 < dho> er
19:51 < x10> I mean, the guy surely knows that...
19:51 < dho> x10: what version of go are you using?
19:51 < dho> Gracenotes: that's again pre-semicolon-change
19:52 < x10> I'm using the day-1 version
19:52 < dho> x10: update
19:52 < x10> ok
19:52 < dho> :)
19:52 < x10> Is there an easy way?
19:52 < x10> like apt-get update
19:52 < x10> (obviously not *exactly* apt-get update)
19:52 < dho> I'm assuming you built it from mercurial?
19:52 < Gracenotes> dho: hm.  Just my intuition about what'd cause it to
break
19:52 < x10> as per the tutorial, yes
19:52 < Gracenotes> yeah, consecutive string literals had been removed, huh
19:53 < dho> x10: go into that directory and run hg pull -u
19:53 < Gracenotes> I had to update my own app to fix it.
19:53 < Gracenotes> what's the problem with them?
19:53 < dho> Gracenotes: it breaks an import clause like that :)
19:53 < x10> That's it?  Wow :)
19:53 < dho> x10: well and then re-build :)
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19:54 < Gracenotes> dho: meh.  I liked them.  now my code is littered with
+s everywhere
19:55 < Gracenotes> not as good to make many changes/features where only one
use case is considered, to the detriment of others
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19:56 < Gracenotes> anyhow, overreacty rant
19:56 < dho> x10: actually, there's a section in the
golang.org/doc/install.html that says `keeping up with releases'
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19:57 < dho> just follow that; it should get you what you want :)
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20:00 < dho> hey reppje
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20:25 < taruti> Is there an elegant way of doing os specific things?  Mostly
at the moment "fail compiling if not on linux"
20:26 < dho> taruti: use case?
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20:27 < dho> taruti: how it is handled now is that the syscall module builds
what it knows about, and things like os or net have files with $GOOS embedded into
them, which are included in GOFILES in their Makefile
20:28 < dho> If you're planning on adding something like
pkg/os/iovec_linux.go, you'd just add iovec_$GOOS.go and then create one for
darwin/freebsd/nacl as well
20:28 < dho> If you're adding OS-specific stuff, you may just want to do
syscalls though
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20:30 < taruti> dho: ok.  so specific files + Makefile-rules.  I can live
with that.
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20:35 < taruti> is there a more idiomatic way of saying "[][]byte{a,b,c}" ?
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20:38 < dho> dunno about that.
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20:48 < deso> is it possible to Print(f) the result of a multiple return
value function without assigning variables or with assignment but within the
parantheses of the Print call?
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20:49 < jessta> deso: nope
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20:50 < deso> k
20:56 < quag> deso: multiple return values != tuple
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20:57 < deso> does go have tuples?
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20:58 < dagle> No.
20:59 < KirkMcDonald> It has structs, and it has some tuple-like syntax.
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21:02 < x10> Hey, I have a simple go question
21:02 < x10> I get this error
21:02 < x10> cannot use "asdf" (type string) as type []uint8 in function
argument
21:02 < x10> How do I convert?
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21:04 < dho> strings.Bytes("asdf")
21:04 < x10> ah
21:04 < x10> Yes, thank you
21:05 < dho> np
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21:07 < x10> are there multiline strings in Go?
21:07 < dagle> "oeu\noeau\n" ?
21:08 < x10> I mean like in Python
21:08 < x10> '''asdasdasdasdas
21:08 < x10> asdsadas
21:08 < x10> '''
21:08 < dho> foo := `string
21:08 < dho> string
21:08 < dho> string`
21:09 < x10> thank you :0
21:09 < KirkMcDonald> x10: All string literals are multi-line strings in Go.
21:09 < KirkMcDonald> (I have always been baffled as to why this is not the
case in Python.)
21:09 < x10> you mean "asdfasd
21:09 < x10> asdsda"
21:09 < x10> is valid?
21:09 < x10> nice
21:09 < KirkMcDonald> That should work, yes.
21:10 < x10> the " doesn't work, the ` does
21:13 < KirkMcDonald> Curious.  I wonder why that is.
21:13 < KirkMcDonald> Though it is documented.
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21:30 < x10> I can't seem to find an API documentation for built-in classes
21:30 -!- StDan [n=danielb@124-197-59-227.callplus.net.nz] has joined #go-nuts
21:30 < x10> (like string/bytes)?
21:31 < x10> I'm looking for a "replace" function, specifically
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21:31 < dho> There's not a string replace
21:32 < KirkMcDonald> I thought strings.Replace was added?
21:32 * KirkMcDonald checks.
21:32 < KirkMcDonald> Guess not.
21:32 < x10> oh well
21:32 < dho> it's a horribly inefficient operation
21:32 < x10> still, how can I check for methods on bytes/maps/whatever?
21:32 < dho> strings are immutable in go
21:33 < dho> www.golang.org/pkg/?
21:33 < x10> I mean built-in packages
21:33 < x10> argh
21:33 < x10> built-in types
21:33 < x10> that you can use without "import"-ing
21:33 < KirkMcDonald> x10: The spec.
21:33 < x10> mhm, thanks
21:33 < dho> built-in types are not objects and do not have methods
21:34 < KirkMcDonald> Also true.
21:34 < KirkMcDonald> Well, they are objects in the broad sense of the word,
I would say.
21:34 < dho> for instance, there is no maptype.reduce
21:34 < KirkMcDonald> The reference types, at least.
21:34 < dho> (there is a vector.reduce)
21:34 < dho> or
21:34 < dho> no, an iterator.reduce
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21:55 < x10> Hi, I'm trying to import one of my files
21:55 < x10> and it fails
21:55 < x10> fatal error: can't find import: ./file.go
21:55 < x10> import "./file.go"
21:55 < x10> what Am I missing?
21:55 <+iant> normally one would write import "./file"
21:55 <+iant> and the compiler would read file.a or file.6
21:55 < x10> that fails too
21:55 < x10> ahhh
21:55 <+iant> you don't import Go files
21:55 < x10> so I have to compile it?
21:56 <+iant> yes
21:56 < x10> thank you
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21:58 < luca__> KirkMcDonald: hi, you are the one that written pyd, right?
21:58 < luca__> *wrote, damn
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21:59 < KirkMcDonald> luca__: Yes.
22:00 < luca__> KirkMcDonald: are you off D and using Go now?
22:00 < KirkMcDonald> In the sense that I haven't written D code in years,
and have written Go code in the last month, I suppose.
22:00 < luca__> KirkMcDonald: I'd like to know the opinion about Go from
somebody that actively use it and used D too :)
22:00 < KirkMcDonald> But that is only because D is a disaster.
22:01 < luca__> KirkMcDonald: you mean as a language or becuase of the
crappy community-leading?  :)
22:01 < KirkMcDonald> The latter, mostly.
22:01 < KirkMcDonald> The language itself has a lot to like.
22:01 < KirkMcDonald> However.  D and Go have some significant differences.
22:02 < KirkMcDonald> I do not think it would be fair to describe Go as a
replacement for D.
22:02 < luca__> I've seen a little Go, and tried to port a small program to
it, but I found a few kludges that dragged me away (like the lack of a fork()
function)
22:02 < luca__> (not ForkExec(), just fork() :)
22:03 <+iant> luca__: It's very hard to write a correct fork() function for
a multi-threaded program, and Go programs are pretty much always multi-threaded
22:03 < dho> Not sure why that's a detriment.
22:03 <+iant> what do you want to use fork for?
22:03 < KirkMcDonald> Yes.  Go's C integration leaves a little to be
desired, particularly compared to D.
22:03 < luca__> iant: just to make a simple daemon
22:03 < KirkMcDonald> luca__: Use goroutines.
22:03 <+iant> Lack of a daemonization function is definitely an issue
22:03 < KirkMcDonald> Oh, I see.
22:03 < luca__> KirkMcDonald: :)
22:03 < KirkMcDonald> Yes, daemonization is to be desired.
22:04 <+iant> that one is much easier to solve than fork
22:04 < luca__> iant: I guess that fork()ing *before* running any threads is
safe, but I guess it's hard to ensure that
22:04 <+iant> issue 227 is open for that
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22:04 < luca__> iant: ok
22:06 < taruti> luca__: yes, that is nasty.
22:07 < taruti> luca__: currently the solution seems to be a C wrapper that
double-forks and then execs the go-program
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22:07 < x10> excuse me, what are some sane values for syscall.Open() ?
22:08 < x10> I keep getting no error
22:08 < x10> but it reads 0 bytes
22:08 < dho> why are you using syscall.Open?
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22:08 < x10> http://pastebin.com/m61b6a643
22:08 < dho> I'm pretty sure you want os.Open.
22:08 < x10> I'm using file.open
22:08 < x10> From the Go tutorial
22:09 < x10> ok, os.open
22:10 < dho> http://golang.org/pkg/os/#File.Open
22:10 < dho> what you pasted isn't a complete go program
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22:11 < dho> and also you're passing an empty slice into read, which doesn't
have any size.  File.Read takes a slice, but that really means it wants you to
pass it an array
22:11 < dho> you probably want to be using the bufio package
22:11 < dho> http://golang.org/pkg/bufio/
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22:12 < x10> http://pastebin.com/m633a2208
22:12 < x10> I'm not sure I understand the slice thing
22:12 < x10> Am I supposed to know how big the text will be before I read
it?
22:13 < dho> You're supposed to know how much you want to read before you
read it.
22:13 < dho> There are all sorts of ways to do that
22:13 < x10> I want the whole file
22:13 < dho> Ok.
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22:13 < KirkMcDonald> stat the file, allocate a buffer big enough to hold
it.
22:13 < KirkMcDonald> Read into that buffer.
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22:14 < KirkMcDonald> (There's a function which does this already, innit?)
22:14 < pure_x01> is there anyone who can tell me were i can read about the
expected future performance of go relative to example c, java or c++ ..  or can
anyone here tell me?
22:14 < dho> there's the language shootout that tells you current
performance
22:14 < dho> as for future performance, that's a `see how it goes'
22:14 <+iant> KirkMcDonald: ioutil.ReadFile
22:15 < x10> Will try :)
22:15 < pure_x01> dho: but based on the arcitechture it should be possible
to predict
22:15 < dho> pure_x01: Sure.  Eventually it will get x% faster on OS/Arch
combination Y/Z?
22:16 <+iant> pure_x01: real performance is going to hinge on garbage
collection performance, and that is work in progress
22:16 < dho> There are certainly GC and runtime improvements that are
planned, but as they're rather up in the air (as well as a large number of toher
things) it's very speculative
22:17 < pure_x01> dho: yes i see..  i guess performance of go is one of
those things that many people are worried about
22:17 < dho> Why?  It already performs rather well for things that aren't
string ops.
22:18 < dho> It *should* improve more, but I don't think that people should
justifiably be worried about it.
22:19 < dho> (and that said about strings, there are roadmap topics for
explicit conversions from string to []byte and []int)
22:19 < pure_x01> dho: i have only looked at the benchmark shootout ...
22:19 < quag> pure_x01: given many people are worried about the performance
of Go, and the language lends itself to high performance, it is likely Go will get
rather fast.
22:21 < pure_x01> guag: i hope so and it probably will ..  if it does not it
will probably not be a success as a systems language
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22:23 < quag> pure_x01: put it this way, apart from the GC, what is stopping
Go from becoming as fast as C?
22:23 < pure_x01> there are many new languages to learn and spending when
you choose one you would like it to be a language that you can really use in the
future.  Go is a nice language and the performance is the only thing that i worry
about.  Since it is nativly compiled and a fairly lightweight language i really
hope that it will have performance similar to c or c++.  hopefully faster than jav
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22:23 < pure_x01> a
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22:23 < waht2> is go better than objective c for mac programming
22:23 < pure_x01> guag: i agree
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22:24 < quag> waht2: I don't think that go can do GUI stuff or use any of
the OSX api.
22:24 < quag> (for gui stuff)
22:24 < quag> waht2: so, probably no :)
22:28 < dho> There are X bindings
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22:32 < pure_x01> does anybody know if google intends to use go internally ?
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22:33 <+iant> do we intend to use it internally?  yes.  do we intend to use
only Go and discard all other languages?  no.
22:33 < quag> dho: are the X bindings in the repo?
22:33 < pure_x01> iant: that great :-)
22:34 < pure_x01> i mean that is great..  (stupid netbook keyboard)
22:34 < x10> Hey, guys
22:34 < sheb> do you intend to replace python by go ? :)
22:34 < x10> Is there someone here who would like to give me a small
tutorial?
22:34 < x10> I want to build a small web app
22:34 < x10> and I have several questions
22:35 < x10> (that should have easy answers for some who knows Go)
22:35 < x10> *someone
22:35 < x10> I'd like to have an http.Conn that takes extra parameters
22:35 < x10> i.e.  to have some state
22:37 < pure_x01> sheb: i guess the answer you are going to get is no :-)
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22:42 < x10> hmm
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22:42 < x10> var StateData = make(map[string]string)
22:42 < x10> and then on a request:
22:43 < x10> StateData[c.RemoteAddr] = "ASDASDASDASDASD"
22:43 < x10> But how do I check if there's something in
StateData[c.RemoteAddr] ?
22:43 < sheb> val, found := StateData[c.RemoteAddr]
22:43 < dho> it's listed in effective go
22:44 < dho> quag: yes, I believe they're in exp/xdg
22:44 < x10> oh, it's listed...
22:44 < x10> sorry :)
22:44 < dho> shortly under that is how to delete from a map too :)
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23:19 < kashia_> there is a DotDotDotType but no DotDotDotValue, pity :)
23:20 < kashia_> a FuncType#Call() is impossible with a var-arg function I
guess
23:22 < KirkMcDonald> A ...  type is just a struct, isn't it?
23:22 < kashia_> I tried throwing stuff at it, but no go :)
23:23 < kashia_> and I can't leave the parameter off, because of a check in
the #Call() function
23:24 < kashia_> the implementation looks...  icky, so I didn't even try to
adapt the check
23:24 < kashia_> no, not icky, rather...  scary.
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23:47 < kashia_> even a 'forwarding function' (to catch the `args ...` +
reflect.NewValue()) crashes.  type mismatch: ...  != main.dsigddd_5ยท5
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--- Log closed Tue Jan 05 00:00:42 2010