--- Log opened Mon Feb 22 00:00:13 2010
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01:50 < plexdev> http://is.gd/8TOMU by [Ken Thompson] in go/src/cmd/6g/ --
all done except -
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03:07 < plexdev> http://is.gd/8U2HV by [Russ Cox] in go/test/ -- test:
rename nul.go to nul1.go
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03:54 < plexdev> http://is.gd/8UaL5 by [Michael Hoisie] in go/src/pkg/http/
-- http request URI should never be empty
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04:57 * Will_D finds possible bug
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05:14 < Sherlock> What is the current status of Go?
05:15 < uriel> what is that question supposed to mean?
05:15 < uriel> deffine 'status'
05:16 < Sherlock> "stable enough to use in a practical environment"
05:16 < Sherlock> "not recomended for use above testing"
05:16 < uriel> deffine 'practical environment'
05:16 < Sherlock> "very stable, like pytho"
05:16 < Sherlock> n
05:16 < uriel> I (and many others) find it quite practical
05:17 < uriel> it is clearly not finished (some parts of the language itself
are not completely settled down, but most of the important bits are quite solid)
05:17 < uriel> and the implementation is not quite ready for 'mission
critical' uses, but can be used in production with some care
05:17 < uriel> (eg., golang.org runs go)
05:18 < uriel> in short, like every other tool, it depends on what you want
to use it for, and in many cases the only way to really find out is to try it out
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06:49 < Macpunk> Anyone available for a quick question about allocation and
the way Effective Go explains it?
06:51 < cbeck> May as well ask, and see if anyone can answer
06:51 < uriel> Macpunk: never ask to ask, just ask
06:52 < Macpunk> Fair enough, thank you.  :-)
06:52 < Macpunk> var v []int = make([]int, 100) // v now refers to a new
array of 100 ints
06:52 < Macpunk> I would assume v now refers to a slice of 100 ints...am I
wrong?
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06:57 < uriel> I'm not sure, but that doesn't seem very idiomatic...
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06:57 < uriel> (but i could be wrong)
06:58 < uriel> what are you trying to do?
06:58 < Macpunk> it's not
06:59 < Macpunk> I'm just reading through the rules on allocation with
new/make
06:59 < Macpunk> er, new *and* make, not new *or* make
06:59 < Macpunk> but it seems as though that comment on that example is
misleading...
07:00 < Macpunk> since make([]int, 100) makes a slice and not an array(you
don't make arrays, you use new to allocate arrays)
07:00 < anticw> []int is a slice
07:00 < anticw> [100]int is an array
07:00 < uriel> Macpunk: slices always refer to some array
07:01 < uriel> afaik v is an slice that *refers* to an array of 100 ints
(note that it doesn't say that v *is* an array of 100 ints)
07:02 < anticw> call a slice a slice, calling it an array is confusing
07:02 < anticw> because there are arrays too, and they are distinct types
07:02 < Macpunk> anticw, exactly what I thought =\
07:02 < Macpunk> that's why that line troubles me, they declare v as a
[]int, which is a slice of ints
07:03 < Macpunk> yet v refers to an array?
07:03 < anticw> it's a clie
07:03 < anticw> slice
07:03 < uriel> Macpunk: as I said, *all slices refer to an underlying
array*&
07:03 < anticw> a slice is an array of sorts ...  but it's not the same as a
tranditional array
07:03 < Macpunk> it can grow and shrink dynamically
07:03 < uriel> a slice is just basically a pointer to some possition in an
array
07:04 < uriel> Macpunk: only as far as the underlying array allows
07:04 < anticw> Macpunk: you can't
07:04 < uriel> slives are not 'arrays of sorts', they are references to
arrays
07:04 < anticw> Macpunk: a slice as a cap (capacity) and a length ...  if
you want to change the capacity, you need to realloc and copy
07:04 < uriel> you can just grow what part of the underlying array the slice
refers to
07:07 < Macpunk> hm, okay
07:08 < adu> do pointers have underlying arrays?
07:08 < anticw> no
07:09 < anticw> a pointer is a pointer typically, nothing more
07:09 < adu> new and make are confusing
07:10 < anticw> new(T) returns a pointer to T which is zeroed
07:10 < anticw> effective go talks about this and the difference to make
07:10 < anticw> you don't use new as much as you might thing you would
07:10 < anticw> often code ends up being something like: foo :=
bar.CreateBlem()
07:11 < anticw> or: foo := &someType{1,2,3}
07:12 < adu> that looks C++0x-ish
07:12 < anticw> := ?
07:12 < adu> no the {1,2,3}
07:13 < adu> C++0x is supposed to add list initializers
07:13 < Macpunk> mmmm, according to my test, v would refer to a slice.
07:14 < Macpunk> http://pastebin.com/m426949d7
07:14 < anticw> they are slices
07:14 < Macpunk> mmmhmmm
07:14 < anticw> arrays have static sizes
07:14 < Macpunk> so Effective Go is misleading
07:14 < Macpunk> yes
07:15 < anticw> i dont think so
07:15 < anticw> which works are misleading?
07:15 < Macpunk> var v []int = make([]int, 100) // v now refers to a new
array of 100 ints
07:15 < anticw> ah
07:15 < Macpunk> "v now refers to a new *array* of 100 ints"
07:15 < anticw> well, technically a slice is an array
07:16 < anticw> but arrays and slices in Go are not the same thing
07:16 < Macpunk> yeah, and I think at that point in that document the
distinction is kind of critical
07:16 < anticw> so as i said, strictly speaking a slice is an array ...  but
arrays exist as their own distinct types too
07:16 < JBeshir> I think the problem is with the word "refers"
07:17 < JBeshir> The slice v does indeed refer to a new array, but the name
v does not.
07:18 < JBeshir> "The slice v now refers to a new array of 100 ints" or "v
is initialised as a slice referring to a new array of 100 ints" would be clearer
if clumsy.
07:18 < JBeshir> Maybe someone can find a better wording.
07:20 < Macpunk> v now refers to a slice of 100 ints (referring to an
underlying array of 100 ints)
07:21 < Macpunk> Should I post about this on the mailing list?
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07:24 < anticw> probably won't hurt
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07:26 < Macpunk> mmmkay, thanks for all you guys' help :-)
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07:31 < Macpunk> So if I'
07:31 < Macpunk> er
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07:32 < Macpunk> nvm
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14:26 < vdrab> hi #go-nuts.  What is the idiomatic way of converting between
strings and []byte ?
14:34 < vdrab> I followed the language spec, which suggested
[]byte("hello"), but this didn't work.  A footnote in the spec says this
conversion is not yet implemented.  Any ideas?
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14:48 < taruti> Has anyone got a socketpair syscall for linux done?
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14:53 < jA_cOp> vdrab, Strings.Bytes, I think
14:55 < vdrab> JA_cOp: thanks, that seems to do it
14:55 < jA_cOp> np
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19:24 < skelterjohn> What's the proper way to see how many procs go is
allowed to use...  os.Getenv("GOMAXPROCS")?
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20:00 <+iant> skelterjohn: I think that's the best one can do at the moment
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20:02 < skelterjohn> useful information for a program that wants to
load-balance
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20:25 < gzmask> how do I ignore multiple parameters that a function returns?
i.e a, b := os.Write(...) I want to ignore b
20:26 < drhodes> a, _ := ...
20:27 < gzmask> underscore works, thanks drhodes
20:27 < drhodes> your welcome
20:27 < drhodes> 're!  ^^ >.<
20:37 < gzmask> do I need to import "bytes" to use byte type?
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20:46 < anticw> gzmask: no
20:47 < gzmask> thx anticw...  I did something like a := {'a','b','c
20:47 < gzmask> and fmt.print it, gives me a list of numbers
20:47 < skelterjohn> a := []byte{'a',...}
20:48 < skelterjohn> oh
20:48 < gzmask> yea, that's what I did.  mistyped
20:48 < skelterjohn> you probably used %d instead of %c
20:48 < gzmask> hello := []byte{'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o',
'r', 'l', 'd', '\n'}
20:48 < gzmask> fmt.Print(hello)
20:48 < smw> gzmask: printf
20:48 < gzmask> gives [104 101 108 108 111 44 32 119 111 114 108 100 10]
20:48 < skelterjohn> well, bytes are numbers
20:48 < skelterjohn> so can't say i'm surprised
20:48 < anticw> gzmask: you're printing an array of bytes ...  not chars
20:49 < smw> gzmask: fmt.Printf("%s\n", bytearray)
20:49 < gzmask> I see.  the point of doing this is I am trying to write this
string into a file
20:49 < skelterjohn> string([]byte{'a',...})?
20:49 < skelterjohn> can you do that?
20:50 < gzmask> so when I do file.Write(hello), it gives me nothing in the
file
20:50 < gzmask> no the Write systemcall wont accept string type
20:50 < skelterjohn> flush/close the file?
20:51 < gzmask> done that with file.Close()
20:51 < gzmask> ops, there is a WriteString systemcall.  gonna try that
first
20:52 < skelterjohn> fmt.Fprintf
20:52 < skelterjohn> fmt.FPrintf(theWriter, "hello\n")
20:52 < anticw> flush only matters for buffered IO
20:52 < smw> gzmask: the general rule is never use syscalls, ever
20:52 < anticw> gzmask: i test it here, workds fine
20:53 < anticw> hello := []byte{'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o',
'r', 'l', 'd', '\n'}
20:53 < skelterjohn> check the err return for the Write call
20:53 < anticw> f, _ := os.Open("/tmp/testfile", os.O_CREAT|os.O_RDWR, 0644)
20:53 < anticw> f.Write(hello)
20:53 < skelterjohn> perhaps it isn't returning NoError
20:53 < anticw> strace the code, see what's going on ....  lazy way to check
errors :-)
20:53 < skelterjohn> oh - people often don't realize you have to do multiple
flags to create and write to a file
20:54 < gzmask> my code: file, _ := os.Open("html_escape_output",
os.O_CREAT, 0666) . why you need two flags there?
20:55 < skelterjohn> because you don't want to only create
20:55 < gzmask> ah shit, nvm
20:55 < skelterjohn> you also want to write
20:55 < gzmask> I am an idiot
20:55 < anticw> error checking
20:55 < anticw> error checking
20:55 < anticw> error checking
20:55 < skelterjohn> that too
20:55 < anticw> the write would have errored ...  if you want to avoid error
checking directly use strace or something else
20:55 < anticw> or do what i do, avoid writing bugs
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20:57 < gzmask> anyway, smw, why avoid sys calls?  I think golang is for sys
until/drivers/etc.  so it needs to call them
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20:58 < smw> gzmask: because most people are not writing drivers.
20:59 < smw> gzmask: most syscalls have nice frontend libraries
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20:59 < gzmask> yea...  but then it''ll became c++ with so many nice
frontend libraries...
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21:01 < gzmask> and at least there isn't a nice frontend lib for File IO
AFAIK
21:08 < skelterjohn> C++ may have weaknesses, but the large amount of
front-end libraries available is not one of them, i think
21:09 < fenicks> thanks uriel, for the tips, I have what I was looking for
in go-nuts archives (GO termio binding)
21:10 < gzmask> absolutely correct.  bad example there...  I m trying to
prove the point that kernel space sys calls are nice especially when they are
POSIX
21:14 < anticw> the go windows port is marching along nicely ...  portable
code shouldn't assume POSIX
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21:17 < gzmask> I thought windows is POSIX compatible
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21:20 < skelterjohn> http://en.wikipedia.org/wiki/POSIX#POSIX_for_Windows
21:23 < anticw> file objects seem quite reasonable to be in the current
form, using syscalls directly should be avoided
21:23 < anticw> (i actually do this myself for ioctls, but it's not
something i would encourage at all)
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21:30 < gzmask> I don't know which file object you are referring to, I found
that the tutorial file IO very close to sys call style.
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21:45 < millertimek1a2m3> hey
21:45 < millertimek1a2m3> i just joined the go programming group!  lol :)
21:45 < smw> :-)
21:46 < gzmask> To the top of Mount Wanna-hock-a-loogie
21:46 < smw> welcome
21:47 < smw> gzmask: really?  that is the best you can come up with?
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21:49 < gerry_> whats the likely future for go...  will the gcc front end be
the main entry point?
21:49 < Boggy-B> i am saddened by Go
21:49 < Boggy-B> it's missing some bits to use where id like to
21:50 < Boggy-B> it's more of a language with concurrancy than a concurrant
language
21:50 < jessta> Boggy-B: like what?
21:51 < smw> gerry_: no one knows what the future of go is.  Most people
here pray for success
21:51 < Boggy-B> guarded commands
21:51 < gerry_> smw: its just for the purposes of porting...  where should
efforts be concentrated
21:51 < Boggy-B> i need to to use ALT/PRI ALT structures to get what i want
21:52 < jessta> guarded commands?  like if statements?
21:52 < smw> gerry_: it needs two things gccgo and a windows port (as much
as I hate linux)
21:52 < smw> oops
21:52 < smw> hate windows :-P
21:52 < jessta> Boggy-B: what is ALT/PRI ATL?
21:52 < Boggy-B> no, erm, how to put this..
21:52 < gerry_> smw: ;) yea.
21:53 < Boggy-B> concurrent IF's almost, so you can have a process that runs
in a loop with an input channel, and in the event of that channel receiving and
resolving true on the guard then that action has priority
21:54 < smw> gerry_: it also needs something else.  It needs better
documentation/tutorials.  I love godoc.  But it will not teach you to use a
library well.
21:54 < smw> easytiger: ^
21:54 < Boggy-B> jessta: "It allows a process to wait for multiple events,
but only engage in one of them" from my documentation on Occam
21:54 < Boggy-B> (sorry, im a student, and thus dont know much) lol
21:55 < easytiger> smw: yea true.  i was just considering helping out on a
solaris port if there was interest.
21:55 < jessta> Boggy-B: so, if statements in a select block?
21:55 < Boggy-B> no
21:56 < smw> easytiger: I would be interested in documentation for idiots.
Hopefully that does not say much about me ;-).
21:56 < Boggy-B> it's close, but the if's would have to be perminatly
concurrent, almost like an interrupt
21:57 < easytiger> smw: ha.  yea i found the turoial a bit terse myself.
and some stuff like the line i just saw to demonstrate printf would put new folks
off.
21:57 < Boggy-B> so if (A) { interrupt } else {do something that's forever
looping}
21:57 < easytiger> var u64 uint64 = 1<<64-1
21:57 -!- deso [~deso@x0561a.wh30.tu-dresden.de] has quit [Read error: Connection
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21:57 < Boggy-B> and you want A to be true-able at any time
22:00 < jessta> Boggy-B: still sounds like select block to me
22:00 < Boggy-B> well i am explaining it badly :)
22:00 < Boggy-B> http://frmb.org/occtutor.html#alting
22:01 < dho> select is an alt construct.
22:01 < Boggy-B> they're missing from Go, accoridg to the wiki page, which
would explain why i couldn't find it
22:01 < Boggy-B> oh..
22:02 < Boggy-B> *reads*
22:02 < dho> they are not prioritized, they are randomly entered depending
on the conditions.
22:02 < Boggy-B> is there any way to prioritise them?
22:02 < smw> I have a stupid question.  How do you read a io.Reader into a
[]byte?
22:03 -!- rhelmer [~rhelmer@adsl-69-107-87-1.dsl.pltn13.pacbell.net] has joined
#go-nuts
22:03 < dho> smw: reader.Read()
22:03 <+iant> Boggy-B: you can prioritize to some extent by listing cases
more than once
22:03 < dho> smw: Read takes a a byte array and reads up to len(arg) bytes
22:04 < Boggy-B> right, thanks, that's something learnt right there
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22:05 < Boggy-B> with any luck i can use this language for my projects,
rather than Occam, any language that can't deal with non-fixed width arrays is far
too annoying
22:07 < nf> smw: I'm working on some "documentation for beginners"
22:07 < Boggy-B> i'd like that too.  haha
22:07 < nf> trying to address a lot of the beginner
misconceptions/misunderstandings
22:08 < gzmask> $GOROOT/doc/GoCourseDay1.pdf
22:09 < smw> nf: cool
22:09 < smw> what does mmap: errno=0x16 mean?
22:11 <+iant> smw: it means that something called mmap with invalid values,
such as an address which was not page aligned
22:12 <+iant> smw: did you call mmap?
22:12 < smw> I called make.  Could that be it?
22:12 -!- scm [justme@c136105.adsl.hansenet.de] has quit [Ping timeout: 256
seconds]
22:12 < smw> can make take int64?
22:12 <+iant> calling make shouldn't cause this kind of error, no
22:12 <+iant> is it repeatable?
22:13 <+iant> if it is, please open an issue for it, because something is
wrong
22:13 < smw> iant: http://pastebin.com/ddf8ac40 it is short
22:13 < smw> I am trying to figure out the http lib (for client use)
22:13 -!- scm [justme@d019153.adsl.hansenet.de] has joined #go-nuts
22:14 <+iant> smw: I get an out of memory error when I run that
22:14 < smw> iant: http://pastebin.com/m2d245c9
22:14 < smw> ok
22:14 -!- cmarcelo [~cmarcelo@enlightenment/developer/cmarcelo] has quit [Quit:
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22:15 <+iant> what system are you running on?
22:15 < smw> amd64 linux
22:16 < smw> iant: I figured it out...
22:16 < smw> r.ContentLength == -1
22:16 <+iant> ah
22:16 <+iant> could you still file an issue to get a more plausible error
message for that?
22:16 <+iant> that one is unnecessarily cryptic
22:17 < smw> I agree
22:17 < smw> They do not expect people to do something that stupid I guess
:-P
22:17 < smw> I will make a issue
22:18 <+iant> thanks
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22:19 < smw> iant: it stops -1 at compile time.  The issue is runtime
apparently
22:21 < smw> iant: I am having issue making an example case.  The compiler
is pretty smart
22:21 <+iant> call a function which returns -1
22:21 < nf> smw: i := 0 ; i += -1 ; c := make(..., i) ?
22:23 < smw> iant: testissue.go:5: make([]uint8, num, num) not used
22:23 < smw> oh nm
22:23 < smw> not used means I need to assign it to something
22:24 -!- mssm [~mssm@ip-95-221-93-75.bb.netbynet.ru] has joined #go-nuts
22:24 < gzmask> hmm, beginner question guys: how to list all files from a
directory?  using dir* ?
22:25 < smw> gzmask: http://localhost:6060/pkg/os/#File.Readdirnames
22:25 < smw> gzmask: http://golang.org/pkg/os/#File.Readdirnames
22:25 < gzmask> gdoc?  nice lol
22:25 < smw> lol
22:26 < smw> I use gdoc because it has the latest docs and the http lib is
under heavy development
22:26 < gzmask> you use nightly builds?
22:26 < smw> yeah.  hg sync
22:27 < gzmask> hmm cool tip thx
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22:33 < plexdev> http://is.gd/8Xxqd by [Robert Griesemer] in
go/src/pkg/scanner/ -- scanner: match go/scanner and disallow NUL character;
22:33 < plexdev> http://is.gd/8Xxqu by [Russ Cox] in go/ -- A+C: add Sergei
Skorobogatov (individual CLA)
22:33 < plexdev> http://is.gd/8Xxr2 by [Sergei Skorobogatov] in
go/src/pkg/json/ -- json: fix quoted strings in Marshal
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connection]
22:47 < leonod> night guys
22:47 -!- leonod [~Andreas@zreahese.hus.sgsnet.se] has quit [Quit: Leaving]
22:49 < plexdev> http://is.gd/8XATL by [Petar Maymounkov] in
go/src/pkg/http/ -- http: fix bug in Post
22:49 < plexdev> http://is.gd/8XAU5 by [Andrew Gerrand] in go/doc/ --
effective_go: clarified small comment
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23:06 < easytiger> func filter(in chan int, out chan int, prime int) and
func filter(in, out chan int, prime int) are equivalent?
23:06 <+iant> yes
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23:17 < smw> can someone help me with my code?  It is not reading the entire
webpage.  It ends up truncating it.  http://pastebin.com/d54893d06
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23:21 < plexdev> http://is.gd/8XHBA by [Michael Hoisie] in go/src/pkg/xml/
-- xml: treat bool as value in Unmarshal
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23:26 < easytiger> so is "chan int" a type in and of itself?
23:26 < anticw> yes
23:26 < easytiger> so we can have spaces in types in go?
23:26 < jessta> smw: Read() should return some error
23:26 < jessta> smw: you should check for that error
23:27 < smw> jessta: I did
23:27 < smw> <nil>
23:31 < easytiger> s/types/type\ identifiers/
23:35 < sladegen> smw: it's returning 404 here...  no idea why...
23:35 < smw> sladegen: that is odd.  I am at least getting part of it
23:35 < smw> and it is returning 200
23:36 -!- adu [~ajr@pool-71-191-173-96.washdc.fios.verizon.net] has joined
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23:37 < plexdev> http://is.gd/8XKRC by [Petar Maymounkov] in
go/src/pkg/http/ -- http: use RawURL in Request.Write
23:38 < nf> easytiger: no, you cannot have a space in a keyword
23:39 < nf> otherwise how would you distinguish:
23:39 < nf> foo chan int // where "foo chan" is an int
23:39 < nf> foo chan int // where "foo" is a chan int
23:39 -!- vdrab [~vdrab@cap010-038.kcn.ne.jp] has joined #go-nuts
23:40 <+iant> easytiger: chan int is not an identifier, it is a type, just
like []int is a type
23:41 < easytiger> iant, nf:thanks, just finding that a bit confusing
23:41 <+iant> it's not really different from C/C++, where, e.g., "long
unsigned int" is a type
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23:49 < smw> iant: do you have any idea why my program is not working?
http://pastebin.com/d54893d06 . I am right now just trying to get a proof of
concept for downloading a webpage and it is not easy :-\
23:50 < anticw> iant: is there a way to create a slice (providing the array)
using reflection somewhere?  i looked and didnt see one
23:52 < smw> anticw: wouldn't assigning an array to a slice work?
23:53 < smw> var something []T; something = an-array
23:53 < sladegen> smw: i'm guessing you have to read until os.eof...
23:53 -!- sinuhe [~sinuhe@64.245.157.11] has quit [Quit: leaving]
23:53 < smw> sladegen: thanks I will look at that
23:53 < anticw> oh right, i think i was told that and my brain censored it
23:53 < smw> I need to go
23:53 < smw> lol
23:53 < anticw> i should look at the code and try and see what's not working
23:54 < plexdev> http://is.gd/8XO81 by [Robert Griesemer] in
go/src/pkg/go/printer/ -- go/printer (gofmt): remove more residue from semicolon
transition
--- Log closed Tue Feb 23 00:00:14 2010