Go Language Resources Go, golang, go... NOTE: This page ceased updating in October, 2012

--- Log opened Thu May 05 00:00:50 2011
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00:38 < jeremy_c> I am getting out of memory errors, my program consumes
about 1.8g then terminates.  I am reading/writing thousands of 4mb files in a
loop.  I tried adding runtime.GC() but no difference.  Each time through the loop
I am { content := ioutils.ReadFile()...  iouilts.WriteFile(...).  } ...  shouldn't
GC take care of that?
00:39 < skelterjohn> try io.Copy
00:39 < jeremy_c> it crashes in ioutil.ReadAll.
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00:40 < jeremy_c> to a string writer then analyze the content of the string?
I am not copying files, but reading, analyzing, writing an altered output.
00:40 < skelterjohn> ah
00:40 < skelterjohn> try writing to the same buffer each time
00:41 < jeremy_c> ok
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00:50 < skelterjohn> but don't make a string out of that buffer - if you can
manage it, do analysis on the []byte
00:50 < jeremy_c> skelterjohn: much better, my program now consumes 19mb.
00:50 < skelterjohn> oh good
00:51 < dfc> jeremy_c: 8g or 6g
00:51 < dfc> ?
00:51 < jeremy_c> dfc: 8g
00:51 < dfc> right, that is why it crashes at 1.8gb
00:51 < skelterjohn> he wanted to know why it bothered consuming tha tmuch
in the first place
00:51 < jeremy_c> I still don't understand why why it ta.....  right.  what
skelterjohn said
00:51 < skelterjohn> a perfect garbage collector would have thrown out the
old data immediately
00:52 < skelterjohn> garbage collection is hard
00:55 < tylerl> remember that if there's any function or mechanism that can
use a variable later on, even it it isn't actually used, it won't get GCed
00:56 < jeremy_c> tylerl: for { abc := ioutil.ReadFile("abc") } ?
00:56 < jeremy_c> I have not tried it, but I think that's the root of my
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01:06 < tylerl> jeremy_c: you just read the file, and then discard the
contents?  That's it?
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01:15 < jeremy_c> tyler1, no, I do some analysis/changes and write out a new
file but it's ReadFile being assigned to abc that never gets garbage collected.
01:15 < jeremy_c> yet each time around it is assigning to a new variable,
the old variable contents is no longer accessible, thus I would have thought it
would have been cleaned up.
01:17 < nictuku> jeremy_c, did you maybe forget to Close() the file
01:17 < nictuku> it won't be closed for you.
01:18 < jeremy_c> In the original I only used ioutil.ReadFile() and
ioutil.WriteFile() so I was not dealing with file descriptors.
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01:24 < tylerl> jeremy_c: my point is this: look at where you're doing the
analysis, changes, etc., and see if it's getting leaked there.  Any closures or
similar structures that have access to the var will keep it alive
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01:28 < jeremy_c> I'll look again but the program at this point is simple
enough to be contained in 1 function :-) No types, nothing.  Just really
processing flags, looping, reading/testing/writing.
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04:43 < tylerl> is there a Go version of access(2)?
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07:10 < tylerl> how would you use a channel that can only send or only
receive?  Don't you need two endpoints to use it?
07:11 < tylerl> http://golang.org/doc/go_spec.html#Channel_types
07:11 < Namegduf> You'd take a channel and pass a send-only or receive-only
channel into something.
07:12 < tylerl> Namegduf: so a function would take a send-only channel,
which woudl be converted implicitly when you call it?
07:12 < tylerl> for example?
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07:15 < dfc> func f(c <- chan int) { }
07:15 < dfc> then call
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07:15 < dfc> f(make(chan int))
07:16 < tylerl> cool, thanks
07:16 < dfc> obviously, in real code you'd retain a reference to the chan
you pass to f()
07:16 < dfc> but you get the idea
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08:08 < genbattle> hi, i'm having some cgo problems
08:09 < genbattle> building with a makefile, but i keep getting a "undefined
reference to `clGetPlatformIDs'" error
08:09 < Kafo> Have you set the compiler flags correctly?
08:10 < Kafo> As in "// #cgo LDFLAGS: -lthe_library_with_clGetPlatformIDs"
or something
08:10 < genbattle> yes, "#cgo CFLAGS:-lOpenCL"
08:11 < genbattle> i'll try LDFLAGS
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08:12 < genbattle> sweet, it compiled without errors, thanks :-)
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08:17 < ww> oh very interesting.  i've been meaning in a very back-burner
kind of way to play with opencl
08:18 < ww> i proposed it for a project, doing the prune part of sweep and
prune with geographical indexes
08:18 < ww> but it was decided that consumer gpus generate too much heat and
server ones are too expensive so it got shelved
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08:27 < genbattle> ww: i think opencl really is the way of the future :)
08:27 * uriel doubts it
08:28 < genbattle> at the moment computers are moving strongly to on-chip
08:28 < genbattle> from mobile to desktop
08:29 < genbattle> so when you combine that with a UMA system you have a
massively parallel processing system with similar memory latency to the main CPU
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08:30 < genbattle> but i guess it'll always be a bit of a niche; prettymuch
all parallel work can be done sequentially, but not all sequential work can be
done in parallel
08:33 < ww> the programming model of opencl is a bit weird though, where you
give the library a string of c-like code that it compiles for you
08:33 < genbattle> yea
08:33 < genbattle> that's true
08:33 < Kafo> Having no project ideas is depressing.
08:33 < genbattle> i should have said GPGPU is the way of the future
08:34 < genbattle> OpenCL is fairly clumsy because it's designed to support
all dorts of hardware like DSPs and FPGAs
08:35 < genbattle> but i prefer a vendor and OS agnostic API over a better
but closed API any day
08:35 < genbattle> Kafo: make a game?
08:35 < mpl> Kafo: how is that possible?
08:36 * uriel doesn't understand how it is possible that somebody has a lack of
project ideas...
08:37 * uriel is drowning on ideas
08:37 * ww is running out of back burners
08:38 < uriel> all my backburners overheated from overload and burned down
long ago :(
08:39 < Kafo> mpl: Probably because I'm not confident enough about my skills
and the ideas die before I even begin with them or something.
08:39 < uriel> Kafo: that is not the same as not having ideas
08:39 < uriel> most of my ideas are probably retarded, or I'm too
incompetent to make them succeed, but wont find out until I try
08:40 < genbattle> uriel: same situation here
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08:40 < Kafo> uriel: That sounds like me.  Should just slightly force myself
to try.
08:41 < genbattle> Kafo: even if you're not confident about your skills,
attack problems anyway, even if you don't get very far, i guarantee you will learn
something :)
08:41 < uriel> Kafo: or look at an existing project and try to contribute
something small
08:41 < uriel> that is always a good way to gain confidence
08:41 < genbattle> i'm attacking this opecl thing with total disregard for
the fact the API is hard and no one will probably use it :P
08:42 < genbattle> but i'll learn about using cgo, and a little more about
using openCL
08:43 < Kafo> Maybe I force myself to even partly implement the next idea I
feel like doing.  :D
08:44 < ww> Kefo, here's an idea - this would help me a lot if you're
interested in this sort of thing.
08:44 < ww> suppose you have a list of books, with titles and authors and
places of publication and such
08:45 < ww> something to say, the author of book1 is (probably) the same
person as the author of book2
08:46 < ww> or, more straightforward but maybe a bit tedious, a MARC21
parser for Go
08:51 < mpl> Kafo: my problem is the contrary.  I often start projects,
underestimating their difficulty and I end up stalling on them because they take
too long to finalize and I have too many on them to work on at the same time :/
08:52 < genbattle> the trick is to keep chipping away at them
08:53 < mpl> yeah, but the context switch is high, it takes me more time to
remember where I was than I have to spare on each of them
08:53 < genbattle> yea
08:53 < genbattle> i tend to do the same thing :)
08:53 < genbattle> these days i try and focus on one project
08:53 < genbattle> and just put the rest on an ideas list, rather than
attacking them as i think of them
08:54 < genbattle> but i still haven't made much progress on this OpenCL
one, so i can't talk
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08:55 < Kafo> I was happily working on a server emulator few months ago.
08:55 < Kafo> But they changed the packet encryption and I can't be bothered
to try cracking it.
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08:57 < ww> there's another interesting one - discovering network
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08:57 < ww> to make pretty maps of other people's networks...
08:57 < ww> or what used to be called network audits (not sure if thye still
call them that)
08:57 < ww> or for the first stages of pen-testing
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08:59 < genbattle> anyone know a better reference for cgo than
http://golang.org/cmd/cgo/ ?
08:59 < ww> anything that involves reverse engineering non-standard things
is likely to become a non-interesting arms race, i can see why you got bored
08:59 < ww> genbattle: the code to the sqlite package is what i used as
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09:00 < genbattle> the code is have no problem with
09:00 < genbattle> i'm not much of a C programmer though
09:00 < genbattle> so build environments tend to get me
09:00 < phanter> In C++ one programs a class, then instantiate it.  There
can be more then 1 instance from a class (with their own internal variables).  How
do I create a Go class and instantiate it in the same way?
09:00 < genbattle> i can write C code, but compiling it, damn near
impossible outside of anythign simple :P
09:01 < ww> what problem are you having?
09:01 < genbattle> phanter: use a go struct just as you would a class in C++
09:02 < phanter> genbattle: I saw this indeed in some examples, but I cannot
get my head around it.  Are there any simple examples about this?
09:02 < genbattle> ww: i managed to compile a small test interface for
opencl, but i don't know how to import it into another go program
09:03 < ww> CGO things are always packages - or at least I've never been
able to do a command directly that uses CGO
09:03 < phanter> I mean, is it like plain old C; passing the struct to all
functions so the functions know the 'internal' state?
09:04 < Kafo> Some kind of (de)compiler/debugger project would be
interesting but it is too far from my programming skills.
09:04 < ww> so if you make a separate thing, using Make.cmd, for your actual
main program, that imports your cgo package like you would any other go package
09:04 < genbattle> i've compiled my cgo code into a .a package
09:05 < ww> i'm guessing you're trying to do that in one
09:05 < ww> are you using gccgo or 6g?
09:05 < genbattle> i just keep getting errors when i try and build code
which imports it, path problems
09:05 < genbattle> 6g
09:05 < genbattle> phanter: it's not like c
09:06 < ww> do you have two separate directories, one for your main program,
one for your cgo package and are you using the Make.cmd and Make.pkg respectively?
09:07 < mpl> any idea how I can get an "unexpected EOF" when using
bytes.ReadFrom() ?
09:07 < genbattle> phanter: if your struct it called mystruct then your
function declaration would be "func (mystruct*) mymethod()"
09:07 < ww> you should gomake install the package (or fiddle with your
GOPATH, but probably easiest to install it)
09:07 < genbattle> ww: yea i've got the lib in a subdir
09:08 < ww> do you have it on bitbucket or github or something?  probably
easiest to look at that way
09:08 < genbattle> nah i don't, but i can stick it up
09:09 < genbattle> it's just a bit of a mess atm :P
09:09 < genbattle> i've been playing with stuff every which way to try and
get it to work
09:09 < phanter> oke; and how do I then instantiate it.  Something like var
myisnt := mypackage()?
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09:09 < phanter> todo myinst.mymethod()
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09:11 < Kafo> phanter: "instance := new(MyType); instance.MyMethod()" ?
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09:12 < phanter> So I have to define a type as well...  have to look that up
09:13 < phanter> aah wait, the type is the struct?
09:13 < genbattle> phanter: yes
09:13 < phanter> like: type mystruct{}
09:13 < Kafo> "type MyType struct { field1 string; field2 uint32; }"
09:13 < phanter> I have to play with that a bit i think.
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09:14 < Kafo> Then methods are declared like "func (m MyType) GetField1() {
return m.field1; }"
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09:33 < phanter> so.  I am not yet there.  I build something small and
pasted it here (http://pastebin.com/PR1wyYPq).  What do I do wrong in
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09:34 < Kafo> phanter: "m Mystruct*" should be "m *Mystruct"
09:34 < kamaji> damnit, I was just typing that!
09:35 < kamaji> :P
09:35 < kamaji> I don't 'spose anyone knows why time.Time.Weekday only seems
to ever be 0?
09:35 < wrtp> phanter: you don't need the "var" keyword in parameter lists
09:36 < phanter> imported and not used: /home/patrick/Projects/Go/testclass
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09:36 < phanter> so compiling the testclass.go is a GO :)
09:36 < kamaji> groan :D
09:36 < wrtp> phanter: you don't need the semicolons either
09:37 < Kafo> Changing "instance := new(Mystruct);" to "instance :=
new(testclass.Mystruct)" should work.
09:37 < phanter> wrtp: yes I know..  but I am so attached to them ;)
09:37 < wrtp> same for "bla := instance.GetSurface()"
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09:37 < wrtp> phanter: run the code through gofmt!
09:37 < phanter> wrtp: what is gofmt
09:38 < Kafo> Source formatting utility
09:38 < Kafo> Run "gofmt ." in the project directory :)
09:38 < phanter> is my formatting incorrect?
09:39 < genbattle> ww: if you still wanted to look at my code
09:39 < jnwhiteh> gofmt will answer that question for us
09:39 < jnwhiteh> and you
09:39 < wrtp> phanter: try "godoc gofmt"
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09:40 < ww> genbattle: ok, so do you "gomake install" in the cl directory?
09:41 < ww> otherwise (and without fiddling with GOPATH) the linker won't
know where to look for it
09:42 < ww> I would also tend to put the test program in its own
subdirectory, and use a makefile that's just the same except it includes Make.cmd
instead of Make.pkg
09:42 < kamaji> Does Time.Weekday get set if you call Parse with a format
string lacking "MONDAY"?
09:43 < genbattle> ww: i think my weakest link is definitely the build
09:43 < phanter> gofmt is nice :)
09:43 < genbattle> my lack of c experience translates to a lack of make
experience :P
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09:44 < ww> go is helpful that way - if you set up the directory structure
right, you can more or less just use the included makefiles and don't need
anything elaborate
09:44 < ww> with the bonus that it will work with goinstall (which doesn't
use the makefiles you provide at all)
09:47 < wrtp> kamaji: "Only those elements present in the value will be set
in the returned time structure."
09:47 < wrtp> worth reading the manual
09:48 < wrtp> if you want the weekday, you could convert to seconds and then
back to *Time
09:48 < phanter> Yes, I got my head around it :) thanks to ya all
09:49 < genbattle> ww: i figured out my problem was the directory i was
copying the package to
09:49 < genbattle> ww: i have my /usr/lib/ dir set up as the home for go
09:50 < genbattle> but i was copying it to another svn checkout of go i have
floating around on my hdd
09:50 < genbattle> i'll set up the build system properly and i should be ok
09:50 < genbattle> hopefully i can get goinstall working
09:50 < genbattle> i've tried to use other repositories like the go-gtk
interface and had endless problems goinstalling
09:51 < Kafo> I hated how gofmt once expanded like 30 lines of "for blahblah
{ a.method(0); }" to three lines each.
09:53 < ww> genbattle: if you want a working example,
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09:53 < ww> which has some subdirectories for supporting packages, two
commands (harvest and deref)
09:53 < ww> and depends on two cgo packages goraptor and libxml
09:54 < ww> in the end you can (or should be able to) just goinstall
bitbucket.org/ww/gold/harvest and it will do all the dependencies and install the
harvest command
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09:54 < ww> but it's obviously not a minimal example :)
09:55 < genbattle> heh, it sounds perfect though
09:56 < genbattle> i should be able to break it down to my level, thanks :)
09:57 < ww> the top-level makefile has some special targets, build, tidy,
that i use in the development process, so i just do "gomake build", but for
actuall installations they're ignored
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10:01 < ww> one important thing is now that you have it on bitbucket, you
should use import "bitbucket.org/genbattle/go-opencl/cl"
10:01 < ww> that will make goinstall happy
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10:03 < genbattle> once i have the build system up and running i'll make
sure i reconfigure it
10:03 < genbattle> thanks for all your help ww, made more progress in one
night than the last 2 weeks :)
10:04 < ww> a pleasure, genbattle
10:06 < Kafo> Bye people, school time.  :)
10:09 < kamaji> wrtp: oh...  thanks
10:10 < ww> "present" is a slippery concept there though
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10:11 < kamaji> ww: how so?
10:11 < kamaji> also, how can I then get the weekday??
10:13 < ww> well the week day isn't "present" in the seconds representation,
for example...  it's inferred
10:14 < ww> if something is implied like that, is it "present" in the
original data?
10:14 < kamaji> oh right, I think it means present in the format string
10:14 < ww> cue existentialist discussion
10:14 < kamaji> lol
10:15 < wrtp> ww: that documentation is on Parse, not Time
10:16 < ww> if i had the energy, i'd argue that weekday is "present" in
"2011-05-05T00:00:00Z" in the same way it is present in the seconds...
10:16 < ww> hey, happy cinqo de maio
10:17 < wrtp> ww: the time string doesn't have to contain a timezone
10:17 < wrtp> so the present rule is simpler
10:18 < kamaji> So pkg time has no way to find weekday from a date?
10:18 < wrtp> it does
10:18 < wrtp> as i said earlier
10:18 < wrtp> convert to Seconds and then back to *Time
10:18 < kamaji> oh, must've missed that, sorry
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10:31 < genbattle> thanks again for all the help, i'm off to bed, night
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11:31 < xyproto> If I write a webpage in Go (self-serving), where can I host
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11:35 < wrtp> xyproto: any place you can serve any compiled web server :-)
11:35 < wrtp> it'd be nice if google app engine supported Go...
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12:06 < xyproto> wrtp: yes, app engine support would be nice
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12:49 < phanter> hmm, how would this work: type Board struct { var board
[6][6]int }
12:50 < phanter> I get this error: unexpected var, expecting name or * or (
or }
12:52 < vegai> "unexpected var" would suggest that you want to drop the
'var' keyword :)
12:52 < vegai> http://golang.org/doc/go_spec.html#Struct_types
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12:57 < phanter> i see...  i keep on making mistakes like this.  Still a way
to go before I grasp it all
12:58 < skelterjohn> keep asking in here - we're happy to helpo
12:58 < skelterjohn> help
13:00 < xyproto> phanter: another comment/explanation could be that types
and variables differ.  Structs are types.  Ints are types.  Variables can be a
type, and that's where the "var" keyword enters the picture, not when defining a
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13:06 < phanter> I was also wondering how I can ask and wait for user input
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13:07 < phanter> (the name of this language makes it almost impossible to
search anything on the web :()
13:07 < xyproto> phanter: one way is using SDL, if you had a game in mind
13:07 < xyproto> phanter: if you use the keyword "golang" it gets easier
13:08 < phanter> golang...  good pointer
13:08 < phanter> no, it is not for a game
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13:14 < xyproto> phanter: here's a simple way for the commandline:
13:14 < skelterjohn> do you mean just reading from standard input?
13:14 < skelterjohn> os.Stdin is a file which you can read from
13:14 < skelterjohn> a nice way is to use the bufio package
13:15 < xyproto> I think Go should be renamed to Golang
13:15 < xyproto> Just to make it easier to search for
13:17 < tux21b> C and C++ isn't searchable either
13:18 < skelterjohn> C is quite searchable
13:18 < tux21b> i think it's just popular, but not really searchable
13:18 < skelterjohn> search for "C example"
13:19 < skelterjohn> the problem with go is that go means something else
13:19 < xyproto> skelterjohn: agree
13:19 < wrtp> "go language" works ok for me
13:19 < skelterjohn> C can refer to answer choice C, I guess, but that's
hardly worth a web page
13:19 < aiju> why do you even search on google for something?
13:19 < aiju> it's all on golang.org or golang.cat-v.org
13:19 < skelterjohn> aiju: and 21kb is enough memory for anyone
13:19 < xyproto> aiju: you're right.  Now we have...  Duck Duck Go:
13:19 < tux21b> searching for "go example" here yields the go tutorial on
first place followed by a couple of stackoverflow questions
13:20 < tux21b> maybe you just have to search for it quite often ;)
13:20 < aiju> skelterjohn: i mean ..  for something about go
13:20 < xyproto> (duck duck go is quite capable of separating different
meanings of the same term)
13:20 < skelterjohn> tux21b: showing that go is searchable doesn't show that
C isn't
13:21 < aiju> c++ used to be totally unsearchable
13:21 < aiju> the ++ made google barf
13:21 < skelterjohn> aiju: why would you need to?  it's all in (insert some
website about C++)
13:22 < aiju> C++ has no official homepage
13:22 < xyproto> we could make one
13:22 < aiju> http://goatse.cx is close
13:22 < skelterjohn> no we couldn't
13:22 < skelterjohn> we could make a homepage
13:22 < xyproto> :P
13:22 < skelterjohn> we couldn't make an official homepage
13:23 < xyproto> skelterjohn: pft, you just don't have the official spirit
over you
13:23 < skelterjohn> i don't get it
13:23 < xyproto> skelterjohn: just making fun of officialdom.  Sorry.  Bad
13:24 < skelterjohn> my wife told me that i couldn't deadpan anyone to shame
over a joke on the internet
13:24 < skelterjohn> she was *wrong*!
13:24 < xyproto> skelterjohn: :D
13:25 < xyproto> skelterjohn: +1 to wife
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13:28 < xyproto> meanburrito920: smooth entry.  We'll never know about
76-217-6-100.lightspeed.irvnca.sbcglobal.net now :P
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13:30 < skelterjohn> i'm pretty sure the irc server did that
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13:37 < xyproto> skelterjohn: gah, +2, I feel humiliated ;)
13:37 < aiju> all DNS names should be like that
13:37 < aiju> simplifies lookup
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13:38 < aiju> 105-149-85-209.google.com
13:39 < xyproto> aiju: just wait until IPv6 catches on...  :P
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13:39 < xyproto> 2001:0db8:85a3:08d3:1319:8a2e:0370:7344
13:39 < xyproto> .google.com
13:41 < xyproto> I've never visted an IPv6 url in my browser.  I wonder
where I can find one.  http://[...]/ for the above adr did not work.
13:41 < xyproto> brackets are required
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14:25 < xyproto> Has someone yet written a C-compiler in Go?
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14:42 < uriel> xyproto: not AFAIK, Go might be a good language to do this,
but I'm not sure anyone is particularly motivated, why not just use Go?
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14:46 < xyproto> uriel: I can imagine at least one reason, which would be to
see if Go was any good at this type of task.
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14:48 < uriel> xyproto: there are plenty of projects to write compilers and
VMs in go: http://go-lang.cat-v.org/go-code
14:48 < uriel> see virtual machines and languages section.
14:54 < mpl> how wrong is it that I find comfort that at least "cout
<<" is easy to type when having to write c++?  :)
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14:57 < xyproto> mpl: very, you should wrap cout in a bunch of "::"'s to
repent ;)
14:59 < mpl> yes.  what were they thinking, providing something easy to use
and type in c++...
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15:01 < xyproto> mpl: I think they were experiencing the dirty joys of
operator overloading
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15:11 < skelterjohn> any mac devs in here?
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15:36 < wrtp> skelterjohn: i develop on macs
15:37 < _nil> wrtp: cool
15:37 < _nil> i'm debating getting a macbook pro but can't decide to get
matte or glossy
15:39 < uriel> grrrr...  the fucking spam is getting in my god damned nerves
15:39 < uriel> adg: *please* enable moderation for new posters *PLEASE*
15:39 < uriel> gogole group's spam filtering is a joke
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16:02 < Venom_X> hello, so I'm trying to compile the latest from the go
repository.  I get as far as : fail: fixedbugs/bug324.go.  Then is stops..  It's
been there for 5 or so minutes.  I don't think it's going to continue.  What
16:16 < skelterjohn> wrtp: UI stuff?
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16:32 < wrtp> skelterjohn: no, backend stuff - although i have done UI stuff
under a predecessor of mac os
16:32 < skelterjohn> me too - in my room back where i grew up i have a shelf
full of "inside macintosh" books!
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16:32 < skelterjohn> system 7!
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16:40 < wrtp> nextstep & openstep for me, more of a direct predecessor :-)
16:40 < wrtp> a lot of stuff in mac os API is still prefixed "NS"...
16:41 < wrtp> (they don't have gofix :-])
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16:43 < Kafo> Heavily off-topic but what is that fancy verb I can use when I
say I'm able to learn something new and start using them without problems like
software and development environment?
16:45 < wrtp> sounds like an adjective not a verb...
16:47 < mpl> Kafo: a quick learner?
16:47 -!- keithcascio [~keithcasc@nat/google/x-nzhgnvoymsprqcbx] has joined
16:47 < mpl> which is indeed neither a verb, nor fancy.
16:47 < Kafo> I'm looking for a verb like in "I'm able to easily _verb_ new
software if needed."
16:48 < mdxi> syncretize
16:48 <+iant> "use"
16:48 < jnwhiteh> 'grok' clearly, but I'm not sure if that'll work outside
the interwebs =)
16:48 < Kafo> I've been wondering about that for ages now and I'm 100% sure
I saw it somewhere a while ago.
16:49 <+iant> Oh, wait, you wanted a fancy word: "utilize"
16:50 <@adg> Kafo: "I'm a fast learner and can quickly become productive
with new technlogies."
16:50 < mdxi> "I excel at rapid syncresis and utilization of novel
programming methodologies"
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16:50 < uriel> adg: if you don't trust me, listen to brad:
16:51 < skelterjohn> how about "hire me"
16:51 < ww> o'er on this side o' the pond, "utilize" isn't fancy at all
16:51 < Kafo> It's adapt!
16:51 < ww> (but it still sounds funny to my ears)
16:51 <@adg> uriel: ehhh
16:51 < mdxi> (i'm trying to sound like a horribly buzzwordy resume, sine
you said you wanted fancy.  i really do love the word "syncretic", however)
16:51 < Kafo> At least I think it is
16:52 <@adg> uriel: it's not that bad, is it?
16:52 < Kafo> Is adapt correct in "I'm able to easily adapt new software if
16:52 <@adg> "adapt to"
16:53 <@adg> "adapt software" implies changing the software
16:53 < skelterjohn> adopt
16:53 < skelterjohn> or adapt to
16:53 < PJRobins> sounds like you are adapable
16:53 < Kafo> Adapt to that is then.
16:53 <@adg> "I can cope with change, man."
16:53 < uriel> it is worse than in any other list I'm on, and every time I
hit the spam button Gmail promptly suggests I unsubscribe from golang-nuts (or
16:53 < ww> assimilate
16:54 < uriel> i wonder how many people just take the suggestion
16:54 < skelterjohn> uriel: do you have it email you all the postings?
16:54 < skelterjohn> i just use the google groups interface page
16:54 < uriel> skelterjohn: ? it is a mailing list
16:54 < skelterjohn> i see a spam message maybe once a week
16:54 <+iant> uriel: I'm marking all the spam postings as spam in the google
groups discussion list
16:54 <+iant> uriel: I hope they will be able to adapt
16:54 < uriel> iant: it doesn't help
16:54 <+iant> it's a learning system
16:54 < uriel> maybe some day they will, it doesn't so far
16:55 <+iant> believe me, they block a lot of spam which you aren't seeing
16:55 <+iant> I see them on the list of messages waiting to be moderated
16:55 < uriel> I believe you, it is not enough, as I said, the go lists are
the only ones I get spam from this days, and it is not getting better (or
admitedly worse)
16:57 < skelterjohn> i think a nice system would be that pre-whitelisted
users messages would appear on the google groups page, and when people read it
there they can vote to let the person in.  sort of like, everyone is a moderator
16:57 < skelterjohn> wouldn't work on every list
16:57 < skelterjohn> but for go-nuts or go-dev it would
16:57 < mdxi> i'm thinking of passing a (reference to a) map of interfaces
as the single argument to a func, in order to mock named arguments.  is this good
form/bad form/meh?
16:58 < skelterjohn> mdxi: a map type is a reference type, btw
16:58 < skelterjohn> mdxi: and when i want to do that i usually make a
parameter struct type
16:58 < skelterjohn> then they're both named and typed
16:58 < aiju> i simply overthink my design
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16:59 < mdxi> skelterjohn: thanks
16:59 <@adg> uriel: i'll think about it some more when i have time
16:59 < uriel> skelterjohn: google groups (as brad point sout) has a fairly
good solution: require moderation for the first message of every new poster
16:59 < ww> i often use goconfig for that - particularly when the values
come from a config file
16:59 < skelterjohn> something i regularly do in my code is make a "type
Config struct { stuff }" and a "func ConfigDefault() Config" method for a package
that needs it
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16:59 <@adg> uriel: i think that's what we'll end up doing
16:59 <+iant> uriel: that is how we configured it originally, but rsc argued
against it
16:59 < skelterjohn> uriel: right - i'm essentially suggesting a method
where it wouldn't fall to a small group to moderate it
17:00 < uriel> adg: that would be great, I run a few (admitedly smaller)
google groups, and is the only system to keep spam away that actually works
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17:00 < uriel> adg: and it is not much work really, less work than flagging
the spam that gets through (which wastes the time of everyone in the list)
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17:01 < ww> you'd think, google with its massive graph of who emails who,
would use that to seed the reputation of new posters
17:01 < aiju> who emails whom!
17:01 * aiju hides
17:01 < ww> aiju: you're not wrong
17:01 < uriel> ww: in fairnes google also is targetted much more than most
other people
17:01 < skelterjohn> whom emails whome /pet peeve
17:02 < uriel> ww: still, their spam filter for gmail is infinitely better
than for google groups
17:02 < ww> and the two are not joined up?  shocking...
17:02 <+iant> yeah, that is weird
17:02 <+iant> I don't understand that either
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17:03 < ww> technically i think it's "who emails to whom"
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17:06 < aiju> i email people
17:06 < aiju> and not to people
17:06 < homa_rano> you send email to people, but you email people
17:06 < uriel> in more on-topic news:
17:06 < ww> anybody else here run go on freebsd?
17:07 < aiju> ycombinator and reddit should be more like 4chan
17:07 < ww> i think but am not sure that 1778 might be related to the
17:07 * niemeyer imagines aiju crunching someone and putting in the wire bit by
17:08 < aiju> niemeyer: hahahahaha
17:08 < ww> aiju: if you use a pen and paper do you write people or do you
write to people?
17:09 < aiju> i write people a letter
17:09 < aiju> or i write a letter to people
17:09 < aiju> i'm no native, though
17:09 < ww> so you write to people, which is correct.  so why don't you
email to people?
17:09 < aiju> no clue
17:10 < skelterjohn> not aiju's fault that english has no consistency
17:10 < skelterjohn> he certainly isn't getting anything wrong
17:10 < aiju> i'm german
17:10 < aiju> if any, i should make the language more inconsistent
17:11 < ww> well...  i wasn't trying to troll for pedanticness when i wrote
email who
17:11 < ww> :P
17:12 < ww> back on topic - any guesses re: #1778 perhaps iant who has
forgotten more about linkers than i will ever know?
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17:14 < skelterjohn> that channel sucks
17:15 < aiju> which one?
17:16 < skelterjohn> #1778
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17:16 * ww groans
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17:19 <+iant> ww: Sorry, I don't know what that means; I posted a request
for readelf -dl output in case it indicates anything
17:22 < ww> iant: attached
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17:24 < ww> is line 54 suspicious?
17:25 < ww> 0x0000000000000001 (NEEDED) Shared library: []
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17:49 < ribo> just starting to look at go, does the http client package
support SSL?
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17:53 < skelterjohn> ribo: here is a gonuts thread about it
17:53 < skelterjohn> i don't do anything with webservers, so i can't help
you directly
17:55 < ribo> hmm, thanks, it's a starting point
17:55 < skelterjohn> you might consider making another post to go-nuts
17:55 < skelterjohn> progress may have been made
17:57 < meanburrito920> xyproto: sorry, i didn't catch your post 'til now.
I thought I had put a delay so my cloak has enough time to kick in, but I guess
not...  I better take a look at that :)
17:57 < ribo> yeah
17:59 < meanburrito920> xyproto: meh, I had it at two second delay, now
changed to 5.  I'm assuming that was the issue.
18:00 < ribo> http://codereview.appspot.com/1729052/show
18:00 < ribo> hmm
18:01 < meanburrito920> meh, it may also be that when I bring my computer
out of sleep it attempts to auto-connect before my nick gets validated with
freenode :(
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18:09 < skelterjohn> apple cocoa is so freaking complicated
18:09 < skelterjohn> so much build up for such simple things
18:09 < skelterjohn> so, sure it would make building whatzamahoozits easier
18:09 < skelterjohn> but i just want to draw an image into a window
18:09 < skelterjohn> there is no reason this should require so much effort
18:11 < pharris> skelterjohn: XMapWindow(XCreateSimpleWindow());
XPutImage(); done.
18:11 < ww> iant: i wonder if the mysterious empty library comes from the
cgo step or the final linking
18:11 < skelterjohn> that doesn't look like cocoa
18:11 < pharris> Yeah, X11 apps don't "feel" right on MacOSX, but if you
just need simple.
18:11 < pharris> … and X11.app is installed by default these days.
18:11 < skelterjohn> i'm trying to come up with exp/draw/mac
18:12 <+iant> ww: cgo generates #pragmas which 6c turns into commands which
tell 6l to include a library
18:12 <+iant> so if you are definitely using an up-to-date 6l, then most
likely cgo has generated an invalid #pragma
18:12 < skelterjohn> i just want to make a library that can open a window,
draw a specified bitmap, and send back some UI events
18:12 <+iant> just a guess, though
18:15 < ww> _cgo_import.c:#pragma dynimport exsltRegisterAll
exsltRegisterAll ""
18:16 < ww> and in fact, in the goraptor one, almost all #pragma are like
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18:20 < wrtp> skelterjohn: take a look at p9p
18:20 < wrtp> or inferno
18:20 < wrtp> both of which do just that
18:21 < skelterjohn> for mac?
18:21 < wrtp> yes
18:21 <+iant> ww: that is normal
18:21 <+iant> ww: which is why I wonder if you could possibly be invoking a
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18:21 <+iant> ww: as support for the final "" was added a month or two ago
18:21 <+iant> ww: previously that was required to be a library name
18:21 <+iant> sorry, I mean why I wonder if you could possibly be invoking
an old 6l
18:22 <+iant> ah, but now I see your reply
18:22 < skelterjohn> wrtp: p9p = plan 9 port?
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18:23 < ribo> I thought the Go mascot looked scarily similar to Glenda
18:24 < skelterjohn> and do i understand you correctly when you say that p9p
and inferno both have, buried in their code somewhere, an example of what i want
to do for go?
18:24 < skelterjohn> rather than i should just invoke some p9p or inferno
library to do it
18:24 < ww> iant: just triple-checked :)
18:25 < ww> i'm going to narrow down exactly which changeset breaks it
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18:27 < wrtp> skelterjohn: yes
18:27 < ww> will take log2(172) builds of go worst case :P
18:27 < wrtp> they have a similar image model
18:28 < wrtp> skelterjohn: try
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18:30 < wrtp> that holds most of the macos-dependent graphics code
18:30 < wrtp> (all, probably)
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18:44 < soapy_illusions> Anyone here familiar with web.go
18:46 < ww> iant: found it
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18:55 < skelterjohn> soapy_illusions: i've used it
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18:56 < soapy_illusions> skelterjohn, do you know the best way to serve
static files, (the http pkg has a serveFile function) and so does web.go but the
function was not exported
18:57 < skelterjohn> if you use web.go, you can set a data directory
18:57 < skelterjohn> and anything in that data directory is accessible if
you give its path in the url
18:58 < Intel_iX> I'm just looking into Go, but can someone explain to me
why a function variable is " f func(func(int,int) int, int) int" according to the
Go blog?  (and not something like "f func(int) int")
18:58 < ww> that's a function which takes a function and two ints
18:58 < ww> as i read it...
18:59 < skelterjohn> well, "func(int) int" and "func(func(int,int) int, int)
int" are two different types
18:59 < skelterjohn> ww a function and one int
18:59 < ww> you could just as easily write,
18:59 < ww> skelterjohn: right, my eyes inserted an extra comma
18:59 < ww> type g func(int, int) int
18:59 < skelterjohn> Intel_iX: "func(int) int" is a perfectly valid type for
a go variable
18:59 < soapy_illusions> skelterjohn, how exactly do you set this data
directory , I am looking through the docs and don't see anything about that
18:59 < ww> type f func(g, int)
19:00 < Intel_iX> So what's the difference between the two?
19:00 -!- preflex [~preflex@unaffiliated/mauke/bot/preflex] has joined #go-nuts
19:00 < Intel_iX> Or wait, nevermind
19:00 < skelterjohn> soapy_illusions: ServerConfig.StaticDir
19:01 < Intel_iX> I think the blog is just written confusingly >_>
19:03 -!- |Craig| [~|Craig|@panda3d/entropy] has quit [Quit: |Craig|]
19:04 < soapy_illusions> skelterjohn, I just searched all the source for
that and found nothing...
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19:08 < Intel_iX> Can someone tell me why this doesn't work?
http://pastebin.com/2Mn5M4Jv I still don't get it ....
19:08 < skelterjohn> soapy_illusions: it's in web.go
19:09 < skelterjohn>
19:09 < skelterjohn> Intel_iX: you need to begin line 6 with "var"
19:10 < skelterjohn> either that or remove line 6 an begin line 7 with "f
:=" instead of "f ="
19:10 < Intel_iX> Seems it was the var statement, what's the difference
between := and = though/
19:11 < soapy_illusions> skelterjohn, thanks a lot seemed to have missed it
19:11 < skelterjohn> := is a "declare and assign" operator
19:12 < skelterjohn> saying "x := a" is equiv to saying "var x Type; x = a"
19:12 < skelterjohn> where Type is a's Type
19:12 < skelterjohn> whatever it happens to be
19:13 -!- Kafo [5b9a04ad@gateway/web/freenode/ip.] has joined #go-nuts
19:16 < wrtp> skelterjohn: as chance would have it, i've just been looking
at some old Go graphics code i've got and being a bit frustrated by exp/draw/x11
(it really needs to be double-buffered).  i'd quite like to do something towards
graphics on the mac - how far have you got?
19:17 < skelterjohn> frustration, futility, etc
19:17 < skelterjohn> i've even done some real iphone dev, too
19:18 < skelterjohn> so i'm not completely unfamiliar with the tools
19:18 < skelterjohn> but all this interface builder stuff that xcode uses is
so bizarre
19:21 < wrtp> yeah, i remember interface builder
19:21 < wrtp> you don't have to use it
19:21 < wrtp> in general
19:22 < skelterjohn> you do if you want the tutorials and documentation
provided by apple to make any sense
19:23 < wrtp> yeah, but for what you want to do, you need almost nothing of
that stuff
19:24 < wrtp> as i said, take a look at that source file - it has everything
you need to get started, i think
19:24 < wrtp> i might have a bash myself
19:24 < skelterjohn> i'd prefer to use the more recent API, if i can
19:24 < skelterjohn> carbon has been deprecated for years
19:25 < wrtp> ah...
19:25 < wrtp> problem is, they really make it hard to just write bits...
19:26 -!- soapy_illusions [~alex@modemcable005.105-177-173.mc.videotron.ca] has
quit [Ping timeout: 240 seconds]
19:27 < skelterjohn> yes
19:27 < skelterjohn> it's very frustrating
19:27 < skelterjohn> they have no interest in cross-platformability
19:27 -!- hcatlin [~hcatlin@pdpc/supporter/professional/hcatlin] has quit [Quit:
19:28 < huin> i doubt they see it in their interest, no
19:30 < wrtp> the main thing is they want you to draw in a
resolution-independent manner, which pixel pushing definitely is not
19:33 < skelterjohn> I'd just like to draw an image
19:34 < wrtp> i think this link might help:
19:34 < wrtp> (search for Drawing Directly to a Bitmap)
19:35 < skelterjohn> i stumbled upon that webpage, yeah
19:35 < wrtp> of course, that doesn't help with creating the window &
getting events
19:35 < skelterjohn> i can create a window - xcode will auto-gen a project
that creates an empty window
19:37 < wrtp> i'm not sure you want to do that, as you want to create the
window from Go, and the auto-generated project will start off in C
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19:38 < skelterjohn> right - i figured a good first step would be to just do
it *somehow*
19:38 < skelterjohn> and then figure out how to turn it into a library
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19:52 < skelterjohn> wrtp: made some progress now
19:52 < skelterjohn> the interface builder is coming back to me, bit by bit
19:52 < skelterjohn> but i'm drawing an image in a window
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20:01 < wrtp> skelterjohn: i've created a window without xcode, but...  it
isn't actually showing
20:02 < skelterjohn> "[thewindow show];"?
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by peer]
20:08 < wrtp> no, show isn't a method.  i've tried "display" and
20:08 < wrtp> neither work
20:09 < wrtp> i might be because i'm not handling events
20:09 < skelterjohn> display tells it to redraw everything inside
20:09 < skelterjohn> do you have xcode and its reference browser?
20:11 < wrtp> yeah, but i don't think that will help in this case
20:13 < wrtp> oh, actually it's working...  ish (it should be blue but it's
grey, and it's not coming to the front, hence it was being hidden)
20:13 -!- xash [~xash@d046237.adsl.hansenet.de] has joined #go-nuts
20:14 < wrtp> now it's blue cool
20:16 < wrtp> skelterjohn: http://pastebin.com/7YtA5Uc0
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20:18 < wrtp> right, that works, now to push some bits
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20:22 < skelterjohn> how do you compile that code?
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20:34 < wrtp> gcc tst.m -framework Cocoa
20:42 < Kafo> Is it safe to increase/decrease a value from multiple
20:43 < Kafo> No reading or checking of the value needed in the code
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20:43 < skelterjohn> x++ is not atomic
20:43 < xash> Kafo: No ..  as increasing means for the CPU: read the value,
inc value, then save it again
20:43 < skelterjohn> if two goroutines both do x++ at the same time it will
either increment by one or by two
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20:44 < Namegduf> In general, concurrent writing to anything is not defined
as safe in Go.
20:45 < Kafo> Okies
20:45 < Namegduf> On x86/x86_64, writes to a given word are always
atomically observed, but they are not guaranteed to be observed before another
writes, unless goroutines communicate.
20:46 < keidaa> how do I initialize a map defined in a struct?
20:46 < wrtp> keidaa: s.m = make(map[string]int)
20:47 < wrtp> Kafo: you can use a sync.Mutex
20:47 < Namegduf> A sync.Mutex counts as a kind of communication, yeah.
20:47 < Namegduf> (I'm not sure if the docs explicitly say so, but much of
the usage of it in the stdlib wouldn't work otherwise)
20:48 < Namegduf> (I think, at least)
20:48 < Kafo> Got 0.01 sec off the runtime by using a channel yay
20:48 < skelterjohn> if you have many many goroutines incrementing this
thing, you might spawn one more goroutine whose job it is to update that variable,
and have it listen to a channel
20:48 < keidaa> wrtp: and I can assign s.m["foo"] = 3 ?
20:49 < Namegduf> Yes.
20:49 < keidaa> it blows up on execution when I try
20:49 < Namegduf> Are you sure you're running the make command first?
20:49 < keidaa> "invalid memory address..."
20:49 < keidaa> sure
20:50 < wrtp> keidaa: paste some code
20:50 < Namegduf> Hmm.
20:50 < Namegduf> Is s actually initialised?
20:50 < Namegduf> If s is a pointer to the struct, not the struct, and it's
not been set to point to a new struct...
20:50 -!- boomtopper
[~boomtoppe@cpc12-nrte22-2-0-cust249.8-4.cable.virginmedia.com] has quit [Quit:
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20:50 < skelterjohn> the "blow up" should say what line it blows up on
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20:51 < skelterjohn> i bet it isn't the s.m["foo"] = 3 line
20:51 < Namegduf> I think it could be the s.m lookup rather than the
m["foo"] bit
20:51 < Namegduf> Let's find out.
20:52 < keidaa> type s struct {m map[string]string} ---- s.m =
make(map[string]string) ---- s.m["foo"] = "bar"
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20:52 < Namegduf> You need to instantiate that type.
20:53 < Namegduf> Types are templates for structures in memory, not an
instance of the structure you can assign to.
20:53 < keidaa> how do I assign a value to it?
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20:54 < Namegduf> You can't assign a value to a type.
20:54 < Namegduf> Types don't have values.
20:54 < Namegduf> They're definitions of the forms a variable can take,
nothing more.
20:55 < keidaa> the type variable
20:55 < Namegduf> There's no type variable.
20:56 < keidaa> what ever s.m is
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20:57 < Namegduf> s.m shouldn't be anything.
20:57 < Namegduf> s is a type.
20:58 < Kafo> Wheee, project euler's first problem solved
20:58 < keidaa> why can I return a value s.s (string) and not s.m
20:59 < skelterjohn> keidaa: s is not a value, period
20:59 < Namegduf> I don't know why you can do anything with s.
20:59 < skelterjohn> it's like saying "why can't i just return int?"
20:59 < Namegduf> Like that.
20:59 < Kafo> Is this Go-ish enough?  http://pastie.org/1869405
21:00 < keidaa> I understand, but my function returns a variable of (type s
struct), how can I assign values to that variable?
21:01 < keidaa> I can with strings but not maps
21:01 < Namegduf> You're making some mistake not in the few lines you've
21:01 < Namegduf> Pastebin it all.
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21:03 < keidaa> think I found the problem; template pkg doesn't accept maps
21:04 < skelterjohn> yes it does
21:04 < skelterjohn> doesn't it?
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21:06 < keidaa> appears not
21:07 < keidaa> println(page.templateData["Body"])
21:07 < keidaa> t, _ := template.ParseFile(page.templateName, nil)
21:08 < keidaa> prints fine but template shows error
21:08 < keidaa> "name not found ..."
21:08 < skelterjohn> that has nothing to do with template accepting maps
21:09 < skelterjohn> ParseFile reads in the actual template
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21:09 < skelterjohn> then you execute the template by giving it a map
21:10 < keidaa> nice
21:10 < keidaa> worked now
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21:14 < keidaa> just so I understand this better: what is stored in memory
when I define a type with a string field?
21:14 < keidaa> I mean since I don't have to allocate it to use it
21:15 < skelterjohn> defining a type doesn't store anything in memory
21:15 < skelterjohn> it just tells the compiler how to treat bits of data
21:15 < skelterjohn> "var x s" allocates.
21:15 < Namegduf> When you instantiate a type with a string field, said
field is basically a small two-word struct
21:15 < keidaa> yes
21:15 -!- Makoryu [~bloodgog@pool-71-174-191-10.bstnma.fios.verizon.net] has
joined #go-nuts
21:16 < keidaa> so when I define a variable on that type, as a return var,
then it gets initialized and the string field gets allocated?
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21:25 < keidaa> I just don't see why you must allocate a map for the
variable but not a string, both have dynamic size
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21:34 < yebyen> can someone tell me the changeset number of tip for -u
21:34 < yebyen> oi, wait
21:34 < yebyen> r57 is new, isn't it
21:34 < skelterjohn> keidaa: not so - strings are immutable
21:34 < skelterjohn> you cannot resize them
21:34 < skelterjohn> different than []byte - you do have to allocate those
21:34 < keidaa> I see
21:35 < skelterjohn> for strings, when you say thestring = "something", the
compiler allocates the data to store "something" and points thestring at it
21:37 < keidaa> can I store a already defined function in a map?  :P
21:37 < skelterjohn> yes
21:37 < skelterjohn> a map with type map[keytype] func (someparams)
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21:40 < keidaa> can I do it inline: var m =
map[string]func{"index":func(type) (ret1, ret2)}
21:40 < keidaa> compiler wants a {
21:40 < skelterjohn> for instance http://pastebin.com/PUyz52WW
21:40 < keidaa> spelling error should be ( after func
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21:40 <+iant> keidaa: you have to give it an actual function
21:41 -!- Nitro [~Nitro@unaffiliated/nitro] has quit [Ping timeout: 240 seconds]
21:41 < keidaa> of course ..
21:42 < skelterjohn> does my example make sense to you?
21:44 < keidaa> yes, trying it out on my code now..
21:46 < keidaa> wow, that actually works
21:46 < keidaa> I'm beginning to enjoy this language
21:47 < Makoryu> Has there been any official announcement about abandoning
plans for generics?
21:47 < Makoryu> I don't really want to go poking around the mailing list
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21:53 < mpl> Makoryu: no.  they're still a possibility.
21:53 -!- ShadowIce [~pyoro@unaffiliated/shadowice-x841044] has quit [Quit:
21:54 < mpl> Makoryu: no one has come up yet with anything satisfactory for
the go core team, that's all.
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21:54 < Makoryu> Oh okay
21:54 < Makoryu> I heard wrong then
21:55 < mpl> well, that's afaik.
21:55 < nictuku> Makoryu, what kind of usage did you have in mind for
21:55 < Makoryu> I don't use Go actually
21:56 < nictuku> right, but you seem to use this feature in other languages.
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21:56 < nictuku> Go has "interfaces" which do a lot of what people used to
employ C++ templates for example.
21:57 < Makoryu> I'm aware
21:57 < yebyen> does anyone work on gosqlite?
21:57 < Makoryu> Go also has a few built-in types with rudimentary
parametric polymorphism (arrays, maps, functions)
21:57 < Makoryu> You just can't define your own
21:57 < Makoryu> Or use type variables
21:57 < yebyen> i just submitted issue#11 on google code, it doesn't compile
anymore on tip or release
21:57 < nictuku> yeah
21:57 < yebyen> since reflect.Typeof seems to have gone
21:59 <+iant> yebyen: it's called reflect.TypeOf now
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22:03 < Makoryu> nictuku: Anyway I am concerned about this mainly from a
social standpoint rather than a technical standpoint.  Go has Google's backing so
it has the opportunity to introduce saner development models to the software
22:03 < Makoryu> And with regards to a few things it's already showing
positive influences (eg.  interface polymorphism instead of inheritance)
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22:34 < Namegduf> Hmm.
22:35 -!- Cobi [~Cobi@2002:1828:88fb:0:aede:48ff:febe:ef03] has joined #go-nuts
22:37 < Namegduf> I have some code for which parallelisation is fairly
important.  On an event, various things need to happen.  In order to allow these
things to be specified and compiled in/out separately from the thing generating
the events, I need to "hook" on events, either by registering a channel or
providing a callback.
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22:39 < Namegduf> Registering a channel is slightly nicer, and means there's
only a single instance of the on-event behaviour happening at once, simplifying
use of shared variables and such.
22:40 < Namegduf> But providing a callback means the event generation stuff
can automatically distribute the callbacks over an arbitrary number of goroutines
in whatever way meets the (fairly loose but existing) ordering requirements of the
22:40 < Namegduf> What do people here think?
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22:43 < Namegduf> The other reasons for needing a "code reacting to events
is not referenced by the things generating events" is that everything can generate
and hook on events, including their own events; the central event source is really
more of a way for these things to trigger each other without having
interdependencies on each other (because they don't)
22:46 < Kafo> Is division slower than multiplication on common processors
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23:00 < Makoryu> Kafo: Not for floats, IIRC
23:00 -!- niemeyer [~niemeyer@200-102-196-125.pltce701.dsl.brasiltelecom.net.br]
has quit [Ping timeout: 240 seconds]
23:00 < Makoryu> But for ints, yes, I think it's slightly slower
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23:34 < davisp> Is there a good example project to look at for a basic go
package layout?
23:40 < Kafo> davisp: Any of the packages in Go's standard library.
23:41 < davisp> Kafo: Well I'm also trying to figure out how to create a
build system that's roughly idiomatic as well so I was looking for something
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23:44 < davisp> Near as I can tell, this sort of pattern is what's common:
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--- Log closed Fri May 06 00:00:50 2011