--- Log opened Fri May 06 00:00:50 2011
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00:19 < Namegduf> Argh.
00:19 < Namegduf> "Why don't we implement this count function, which
provides for loop with i++ behaviour but takes a closure and is slightly longer to
write"
00:20 < Makoryu> ( °_°)
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00:25 < Namegduf> Is there any case where it's legal for a line in Go to
begin with #?
00:26 < Namegduf> Outside of multiline strings?
00:29 < TheSeeker> ok, thinking about starting to use Go again after a few
months of not looking at it ...  looks like a lot has changed.
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00:47 < skelterjohn> TheSeeker: nothing fundamental
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00:50 < ghais> Hello, what is the use case of embedding an anonymous
interface type in a struct, like in this code https://gist.github.com/958268?
00:51 < dfc> ghais: it is use heavily in combining the single method
interfaces, like Reader, Writer, Closer
00:51 < dfc> into more exciting versions
00:51 < dfc> like ReadWriteCloser
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00:52 < dfc> hmm
00:52 < dfc> actualy
00:52 < dfc> sorry, that wasn't you exact question
00:52 < dfc> actually i can't see a use case
00:52 < ghais> :)
00:52 < dfc> you don't need to declare interfaces, just fulfill them
00:52 < skelterjohn> if you say
00:52 < skelterjohn> type X struct { SomeInterface }
00:52 < skelterjohn> and you have "var x X"
00:52 < skelterjohn> then x.SomeInterface = somethingThatImplementsIt
00:53 < skelterjohn> and i believe x will implement SomeInterface
00:53 < skelterjohn> not sure about that last bit
00:53 < Rennex> x and X, that's nice.
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00:53 < skelterjohn> i'm not super creative with my variable names
00:53 < skelterjohn> my children will be named "Boy" and "Girl"
00:53 < dfc> skelterjohn: that sounds like Mixins
00:53 < Namegduf> I've been looking at math stuff recently.
00:53 < dfc> sorta
00:54 < Namegduf> Just think of them as syntactic sugar for defining methods
which just pass through to the embedded item
00:54 < dfc> or sorta kinda polymorphism
00:54 < Namegduf> And the item's name happening to match its type.
00:54 < ghais> OK, I think that makes sense now.
00:54 < Namegduf> Depends what your definition of polymorphism is; embedding
does not give dynamic dispatch, but interfaces do whenever used.
00:54 < dfc> so you could have type T { io.Reader } ; var t T
00:55 < yebyen> iant: hey thanks, how about NewValue?
00:55 < Makoryu> I like it when people insist that polymorphism is another
word for inheritance
00:55 < dfc> t.Reader = os.Open("/dev/urandom")
00:55 < yebyen> wait
00:55 < dfc> t.Read(...) ?
00:55 < yebyen> someone else fixed it already
00:55 < Namegduf> Makoryu: Who did that?
00:56 < dfc> Makoryu: please don't read to much into my use of polymorphism
00:56 < Namegduf> dfc: That looks right
00:56 < dfc> I am just trying to couch my answer in terms of things I
already understand
00:56 < yebyen> well
00:56 < dfc> Namegduf: question is, why ?
00:56 < Namegduf> dfc: Because you can embed more than one type.
00:56 < Makoryu> Namegduf: Nobody here!  The discussion just reminded me of
hearing people do it all the time when talking about OOP languages
00:56 < Makoryu> dfc: I didn't mean you
00:56 < dfc> I guess to avoid having to have Glue methods
00:56 < Namegduf> Easiest to just view it as implicit glue methods.
00:57 < Namegduf> It can't do anything those can't.
00:57 < dfc> yeah
00:57 < Namegduf> i.e.  the "inner" object can't call methods on the outer
object, its methods aren't overriden by the ones on the outer object when it calls
them on itself, etc.
00:57 < plexdev> http://is.gd/YZQoMI by [Russ Cox] in go/lib/codereview/ --
create release-branch.r57
00:57 < plexdev> http://is.gd/A9OJHi by [Russ Cox] in go/src/pkg/xml/ --
[release-branch.r57] xml: fix reflect error
00:57 < dfc> so rather than type T { r io.Reader } ; t = &T{os.Open(...)}
00:57 < plexdev> http://is.gd/ylHNSS by [Russ Cox] in 2 subdirs of
go/src/pkg/image/ -- [release-branch.r57] image: png & jpeg encoding benchmarks
00:57 < plexdev> http://is.gd/iNEPkr by [Russ Cox] in go/src/pkg/http/ --
[release-branch.r57] http: new error for reading a body after it's been closed
00:57 < dfc> then having to add func (t *T) Read() ...
00:57 < plexdev> http://is.gd/p4IwTl by [Russ Cox] in
go/src/pkg/mime/multipart/ -- [release-branch.r57] mime/multipart: fix regression
from previous ReadSlice change
00:58 < Namegduf> dfc: Yeah.
00:58 < plexdev> http://is.gd/fQ4Cab by [Russ Cox] in go/src/pkg/http/ --
[release-branch.r57] http: rename ErrBodyReadAferClose to ErrBodyReadAfterClose
00:58 < dfc> to satisfy the os.Reader
00:58 < plexdev> http://is.gd/pANcxk by [Russ Cox] in 2 subdirs of
go/src/pkg/ -- [release-branch.r57] png: speed up opaque RGBA encoding
00:58 < dfc> it is implicit
00:58 < plexdev> http://is.gd/JcePOd by [Russ Cox] in 2 subdirs of
go/src/pkg/ -- [release-branch.r57] runtime, sync/atomic: fix arm cas
00:58 < dfc> so, that is totally awesome
00:58 < plexdev> http://is.gd/oAKe9y by [Russ Cox] in 4 subdirs of
go/src/cmd/ -- [release-branch.r57] 5a, 6a, 8a, cc: remove old environment
variables
00:58 < Namegduf> It's useful for combining an arbitrary Reader and Writer
into a ReadWriter
00:58 < plexdev> http://is.gd/ejMK8i by [Russ Cox] in 2 subdirs of go/src/
-- [release-branch.r57] http/pprof: fix POST reading bug
00:58 < Namegduf> For a practical example
00:58 < plexdev> http://is.gd/00yggb by [Russ Cox] in 2 subdirs of
go/src/pkg/image/ -- [release-branch.r57] image: add type-specific Set methods and
use them when decoding PNG.
00:58 < dfc> gav
00:58 < plexdev> http://is.gd/ldJzTX by [Russ Cox] in go/src/pkg/image/ --
[release-branch.r57] image: fix build
00:58 < dfc> bloody tav's bot
00:58 < plexdev> http://is.gd/ergBKt by [Russ Cox] in go/doc/ --
[release-branch.r57] doc/install: specify clone -u instead of -r
00:58 < plexdev> http://is.gd/Ev0EuS by [Russ Cox] in go/src/pkg/image/jpeg/
-- [release-branch.r57] jpeg: speed up RGBA encoding ~%50
00:58 < plexdev> http://is.gd/F94W9X by [Russ Cox] in go/src/pkg/reflect/ --
[release-branch.r57] reflect: allow unexported key in Value.MapIndex
00:59 < tav> heh
00:59 < plexdev> http://is.gd/ThfLyZ by [Russ Cox] in go/src/ --
[release-branch.r57] Make.cmd: create TARGDIR if necessary
00:59 < plexdev> http://is.gd/GkU37R by [Russ Cox] in 2 subdirs of go/doc/
-- [release-branch.r57] doc: release.r57
00:59 < tav> sorry guys
00:59 < plexdev> http://is.gd/hwb4aE by [Russ Cox] in go/src/pkg/http/ --
[release-branch.r57] http: fix FormFile nil pointer dereference on missing
multipart form
00:59 < plexdev> http://is.gd/pEPD1Y by [Russ Cox] in go/doc/devel/ --
[release-branch.r57] doc: document r57.1
00:59 < plexdev> http://is.gd/YZQoMI by [Russ Cox] in go/lib/codereview/ --
create release-branch.r57
00:59 < plexdev> http://is.gd/A9OJHi by [Russ Cox] in go/src/pkg/xml/ --
[release-branch.r57] xml: fix reflect error
00:59 < plexdev> http://is.gd/ylHNSS by [Russ Cox] in 2 subdirs of
go/src/pkg/image/ -- [release-branch.r57] image: png & jpeg encoding benchmarks
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00:59 < plexdev> http://is.gd/iNEPkr by [Russ Cox] in go/src/pkg/http/ --
[release-branch.r57] http: new error for reading a body after it's been closed
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00:59 < tav> there =)
01:00 < dfc> and stay out
01:01 < dfc> :P
01:01 < tav> i've already updated the config
01:01 < ghais> reminds me of a scene in Bruce Almighty :)
01:01 < tav> it was meant to be useful, but sadly i've not been keeping up
with the various changes they keep making to the release/branch structure
01:02 < tav> anyways, there'll be no more spamming =)
01:02 < tav> sorry for all annoyances caused by the bot to date
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01:08 <+iant> tav: thanks for running th ebot
01:08 <+iant> the bot
01:09 < tav> my pleasure — sorry for not having maintained it properly
through the various release/branch changes
01:11 < tav> iant and anyone else who might be around...
01:11 < tav> i was wondering if any of you could take a look at some go code
of mine before i deploy it in production....  ?
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01:12 < tav> sadly, not knowing other go coders in real life, i have had
little chance for code reviews of go code =(
01:13 < dfc> tav, sorry for dumping on your bot
01:13 < dfc> it is useful
01:13 < dfc> except when releases happen
01:13 < dfc> then git spams it with heaps of changes
01:13 < dfc> i'm happy to offer to review code if you want someone to bounce
ideas off
01:13 < tav> dfc: no worries dude, i totally relate — hate bots which spam
=(
01:13 < tav> dfc: ah, thanks!
01:14 < tav> the main app is:
https://github.com/tav/togethr/blob/master/live-server/live-server.go
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01:14 < tav> it uses just the standard library and a bunch of amp/ packages
which can be found inside src/go/ in the ampify repo,
e.g.https://github.com/tav/ampify/blob/master/src/go/livequery/livequery.go
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01:16 < tav> urgh, e.g.
https://github.com/tav/ampify/blob/master/src/go/livequery/livequery.go even
01:16 < dfc> cool
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01:16 < dfc> i'll take a look after work
01:16 < tav> thanks man, much appreciated!
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02:47 < crazy2be> how would you structure a CMS that has the ability to
retreive certain objects/data strcutres by name?
02:47 < crazy2be> be they events, wiki pages, photos, etc
02:50 < crazy2be> i was thinking having a struct for each type, allow the
user to modify the struct, and then have a Save() method.  That part i'm fairly
sure of
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02:51 < crazy2be> What i'm unsure of is the best way to structure loading
02:52 < crazy2be> i have one package that has a NewEvent() method that
returns a *Event, which you can then set the ID of and .Load()
02:52 < crazy2be> but that seems icky
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02:53 < crazy2be> i was thinking of having a LoadEvent(id string) method,
rather than a NewEvent() method
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02:53 < crazy2be> yeah that's probably the best solution
02:53 < crazy2be> thanks!
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03:10 < scyth> anyone knows how to get list of databases in mongod, through
mgo driver?
03:13 < scyth> nevermind, got it
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03:27 < crazy2be> hmm i hate that go doesn't initialize pointers to objects
in named return values
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03:49 < Namegduf> Pointers default to nil.
03:49 < Namegduf> Always.
03:51 < skelterjohn> crazy2be: what if you wanted to return an object that
had already been allocated?  if the return values were allocated automatically,
this would be a waste
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03:52 < crazy2be> skelterjohn: True, and it shouldn't really allocate it
03:52 < crazy2be> it just keeps catching me
03:53 < crazy2be> e.g.  i have func NewFoo() (f *Foo) {f.Blar = ...}
03:53 < crazy2be> and i get confused with the nil pointer dereference until
i realize the issue
03:53 < crazy2be> more my fault than the compiler's, but it could pick that
up at compile-time
03:54 < crazy2be> since i'm attempting to assign to a pointer that it can
gaurentee is nil
03:54 < skelterjohn> a clever compiler might catch that one day
03:54 < crazy2be> 'twould be nice
03:54 < crazy2be> anyway night all
03:55 < crazy2be> er, s/assign/dereference
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06:07 < scyth> with json txt like this: {"key1": [ "item1": 4], "key2": [
"item2": 5], }, what would be the appropriate struct type in go?
06:07 < scyth> for Unmarshal
06:07 < taruti> how did I dump the assembler output with 8g?
06:07 < edsrzf> scyth: There's no one type that will work
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06:09 < edsrzf> One possibility would be struct{Key1 struct{Item1 int
"item1"} "key1"; Key2 struct{Item2 int "item2"}}
06:09 < edsrzf> taruti: 8g -S
06:11 < scyth> edsrzf, why not type MyType struct{ Data map[string][]*Items
} where Items struct is { map[string]int }
06:12 < scyth> or something like that
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06:13 < edsrzf> scyth: The struct has to have at least two fields because
the json dictionary has two
06:14 < edsrzf> Or you could just use a map directly and bypass the struct
altogether.
06:14 < scyth> yeah
06:14 < taruti> edsrzf: thanks
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06:34 < taruti> Is there a constant on the number of bits int has?
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06:35 < dfc> no
06:35 < dfc> int is 32 on 32bit platforms, 64 on amd64
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06:36 < taruti> dfc: I mean somewhere in the source const IntBits =
<whatever>
06:37 < taruti> rather than having to use reflect.TypeOf(0).Bits()
06:37 < uriel> I thought int was still the same in all platforms, but it
might change in the future
06:38 < uriel> taruti: why do you need to do that?  just use an integer with
specified size
06:38 < taruti> uriel: yes (reflect crashes on me in this case probably
related to package initialization order and I need to circumvent this)
06:44 < dfc> taruti: ahh, sorry, nope, not sure
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08:17 < icy> does the gc give back memory to the OS nowerdays?  I only know
it didn't do that before and couldn't find a ticket for that
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08:25 < edsrzf> icy: I don't think it does
08:43 < uriel> most GCs don't return memory to the OS once allocated
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08:58 < mpl> I'm having an issue while reading a part from a multipart http
(uploaded file).  on one machine what I did works without a problem, on the other
one I get unexpected EOF at various times depending on the uploaded file.  same
code on both machines, same go tree (weekly-24/04).  any idea please?
08:59 < mpl> code does something similar to this: http://pastie.org/1870951
09:04 < nictuku> mpl, the only idea I have is suggesting you to looking at
the HTTP session conversation with wireshark or tcpdump
09:07 < edsrzf> mpl: I think there have been several fixes to that code
recently
09:07 < edsrzf> I haven't paid attention to what exactly the bugs were, but
I recommend updating.
09:08 < icy> uriel: yea, that's why I stay with C for a bunch of things :)
09:08 < icy> or at least one of the reasons
09:09 < wrtp> icy: C often doesn't return memory to the OS either, unless
you use brk directly
09:09 < mpl> edsrzf: yah, I see Read on a Part now returns an EOF in the
latest changes
09:09 < mpl> gonna update and see.
09:10 < icy> wrtp: C doesn't do anything at all with memory, the allocator
does and I can control that one
09:10 < mpl> I'm just puzzled as to why I have two different behaviour on
the 2 machines while it's the same code, same go version, and same testing
"protocol".
09:11 < wrtp> icy: depends if you're using external libraries or not.
09:11 < icy> wrtp: for example using mmap can be extremely useful
09:11 < wrtp> icy: you can use mmap in go
09:12 < icy> hm yea it has a syscall package
09:13 < wrtp> see, for example http://goneat.org/pkg/launchpad.net/gommap/
09:13 < edsrzf> Or https://github.com/edsrzf/mmap-go ;)
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09:24 < xyproto> s = s + x can be written as s += x, but what if you wanted
to express s = x + s?  += for prepending is missing ;)
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09:29 < mpl> edsrzf: yep that was it.  they had broken something related to
reading parts and they fixed it afterwards.  still don't know why the problem
wasn't showing on the other machine though.
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09:48 < wrtp> could someone please try cd $GOROOT/misc/cgo/test; make
09:48 < wrtp> it fails on my machine, but i'm not sure if it's because of
some local changes i've made
09:49 < wrtp> i think i've reverted my changes, but now i'm paranoid...
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10:09 < wrtp> it's ok - i think it's only designed to be used with gotest
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11:11 * wrtp just managed to get go to create a native mac os window.  woo.
11:15 < nictuku> wrtp, congrats!
11:20 < genbattle> anyone know anything about creating c-style memory blocks
to pass into c functions in cgo?
11:21 < genbattle> so far i've been trying to fiddle with using C.malloc(),
make() and unsafe.NewArray()
11:23 < genbattle> in C i'm doing "*platforms = malloc(num_platforms *
sizeof(cl_platform_id));" but i can't figure out what the equivalent cgo is
11:26 < wrtp> genbattle: you have to cast the return from C.malloc to the
correct type
11:30 < genbattle> the main problem i'm having using C.malloc() is that i
can't figure out how to get sizeof()
11:30 < genbattle> C.sizeof() doesn't seem to work
11:32 < genbattle> my cgo line is platform_ids :=
C.malloc(C.sizeof(C.cl_platform_id) * int(num_platforms)), and i get the error
"cl.go:38:27: call of non-function C.sizeof"
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11:34 < genbattle> any other helpful hint wrtp?
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11:38 < wrtp> genbattle: you can probably use unsafe.Sizeof
11:38 < genbattle> already tried that one
11:38 < genbattle> cl.go:22[_obj/cl.cgo1.go:25]: type
_Ctypedef_cl_platform_id is not an expression
11:38 < genbattle> i think it's meant for use on Go types
11:39 < wrtp> hmm, hold on, i'll have a try
11:39 < genbattle> although you would think it would work on c types too
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11:42 < wrtp> genbattle: it does
11:42 < wrtp> but...
11:42 < genbattle> i make some progress by using
C.Sizeof(new(C.cl_platform_id))
11:42 < wrtp> yeah
11:42 < genbattle> but?
11:43 < wrtp> or just use a global variable of the right type
11:43 < genbattle> it seems the go version only measures the size of actual
variables, instead of types
11:43 < genbattle> oh well
11:43 < wrtp> i was just about to say that
11:43 < wrtp> yes
11:43 < wrtp> it's just a normal function
11:43 < genbattle> ok
11:43 < wrtp> well, not that normal, because the compiler implements it
11:43 < wrtp> and doesn't actually evaluate the expression
11:43 < wrtp> i don't think
11:44 < wrtp> if in doubt, just create a little C function to do your dirty
work for you
11:46 < genbattle> heh
11:46 < genbattle> fortunately i managed to solve the problem with your help
:)
11:47 < genbattle> platform_ids :=
(*C.cl_platform_id)(C.malloc(C.size_t(unsafe.Sizeof(new(C.cl_platform_id)) *
int(num_platforms))))
11:47 < genbattle> seems to produce the equivalent memory allocation
11:47 < genbattle> even if it is a little messy
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11:52 < wrtp> cl_platform_id* new_ids(int n) { return
malloc(sizeof(cl_platform_id) * n); }
11:53 < wrtp> do as much messy stuff as you can in C :-)
11:55 < genbattle> heh
11:55 < genbattle> just don't want to create yet another layer of C to
interface to
11:56 < genbattle> my C skills are pretty second rate :P
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12:01 < GeertJohan> humz updating(hg pull; hg update release; ./all.bash)
fails, TEST FAIL http..
12:01 < GeertJohan> any thoughts?
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12:02 < GeertJohan> --- FAIL: http_test.TestSetsRemoteAddr (0.00 seconds)
12:02 < GeertJohan> Expected local addr; got "192.168.2.22:45233"
12:03 < GeertJohan> while '192.168.2.22' IS actually my wlan0 ip address
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12:07 < genbattle> wrtp: sorry to bug you again, but now that i've got a C
memory block, do you know how i would go about accessing it in cgo?
12:07 < genbattle> since i can't do pointer arithmetic
12:07 < genbattle> i'm guessing there's some more complex casting involved
to be able to index the individual memory addresses?
12:09 < nictuku> argh, the way to do sub-type method overriding is very
unintuitive.
12:10 < genbattle> sub-type?
12:11 < genbattle> how do you get a sub type without inheritance
hierarchies, i don't understand?
12:11 < nictuku> it's possible:
http://golang.org/doc/go_for_cpp_programmers.html#Interfaces
12:11 < nictuku> search for "anonymous"
12:13 < genbattle> hmmm, interesting
12:13 < genbattle> but then can't you override by simply not inheriting?
12:13 < genbattle> because you have to explicitly inherit methods, right?
12:13 < wrtp> nictuku: if you're finding something unintuitive, you're
probably going about it the wrong way...
12:14 < genbattle> maybe i'm not understanding it correctly
12:14 < wrtp> genbattle: you can cast it to a go array
12:15 < wrtp> rather, a pointer to a go array
12:15 < genbattle> ok
12:15 < genbattle> thanks
12:15 < wrtp> then you can slice the array to the correct size
12:16 < nictuku> wrtp, that's very nice of you, to assume I'm doing it wrong
;-)
12:16 < wrtp> nictuku: go doesn't do subtyping
12:16 < nictuku> wrtp, ??
12:17 < nictuku> it does, in a way.  See the link above.
12:17 < wrtp> so if you're talking about subtype method overriding, there's
something wrong :-)
12:17 < wrtp> go does embedding
12:18 < wrtp> and interfaces
12:18 < nictuku> wrtp, I have a specific need of doing method overriding.
And it would be nicer of you to stop assuming I don't know what I'm talking about.
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12:19 < wrtp> describe what your need is, and maybe we can help.
12:20 < nictuku> wrtp, I didn't ask for help.
12:21 < wrtp> sure, but you implied that you were finding something awkward
12:21 < wrtp> go is not usually awkward...
12:23 < wrtp> anyway, if you want to create a type with one method changed,
i'd say that's fairly intuitive and straightforward
12:23 < wrtp> type myType struct {otherType}; func (t myType) Override() {}
12:24 < nictuku> I stated my opinion, not a fact.  We don't have to have the
same opinion.
12:24 < wrtp> sure.
12:24 < wrtp> but out of interest, what do you find unintuitive about the
above idiom?
12:26 < wrtp> genbattle: e.g.  slice :=
(*[1e9]C.cl_platform_id(platform_ids))[0:num_platforms]
12:27 < wrtp> genbattle: note the "large enough" array size
12:27 < nictuku> the fact that having an anonymous field implies parenthood.
12:27 < genbattle> wrtp: thanks
12:28 < wrtp> nictuku: it doesn't imply parenthood - it implies inclusion,
which is a bit different.
12:30 < wrtp> we don't have parents and children in Go - we have
relationships :-)
12:31 < nictuku> wrtp, that might be clear for you, but not for everyone.
And the document even keeps using the word 'inherit'.  So it's not just me that
associates this with inheritance.
12:33 < wrtp> it's true that there's one sentence in that document where it
should probably use "include" rather than "inherit"
12:33 < wrtp> the other one is talking explicitly about its relationship to
C++ classes
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12:34 < nictuku> wrtp, instead of accepting that my point is valid, you
prefer to think the document is wrong ;-)
12:34 < wrtp> one paragraph, actually.  "The set method is effectively
inherited from..."
12:35 < wrtp> nictuku: go doesn't do inheritance :-)
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12:35 < nictuku> wrtp, why do you keep saying that?
12:35 < wrtp> cos it's true?
12:35 < nictuku> "defining set and get for *myType made *myType
automatically inherit from myInterface."
12:36 < wrtp> in the same sentence before, it says "if we view myInterface
as a C++ pure abstract base class"
12:36 < wrtp> so, if we view it like that, sure, you can see it as
inheritance
12:36 < genbattle> nictuku: a struct doesn't inherit from an interface, it
implements it
12:36 < wrtp> it's an analogy
12:37 < wrtp> but it's not a particularly strong analogy
12:37 * nictuku will never rant on this channel anymore
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12:38 < wrtp> nictuku: you were ranting about one of the things that (i
believe) is strongest about the language.  it's not too surprising you got a
response.
12:41 < nictuku> I've been using the language for years, and I think it's
healthy to criticize it.  I respect your opinion that Go is never awkward but I
don't agree.  This is one other awkwardness in the syntax.
12:41 < nictuku> along with "delete a map entry" and others.
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12:42 < genbattle> don't forget type switches :-[
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12:42 < nictuku> genbattle, I don't mind those ;-)
12:43 < genbattle> anyway time for bed for me, thanks for the help wrtp,
night all
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12:45 < nictuku> now, I do need a help.
12:46 < Tasser> hm, the Tree Comparison fails due to compile error (go
playground)
12:46 < wrtp> Tasser: what Tree Comparison?
12:46 < nictuku> oh, can I do sub-interfaces?  type foo interface { bar;
ExtraMethod() } ?
12:46 < wrtp> nictuku: yes
12:46 < nictuku> that's gonna help.  thanks wrtp
12:47 < wrtp> although they're less hierarchical than including anonymous
struct members
12:48 < wrtp> i've come to the conclusion that it's not usually worth using
them like that
12:48 < wrtp> better to have interfaces composed entirely of other
interfaces *or* of methods
12:49 < wrtp> otherwise there's no way of getting access to the interface
type for ExtraMethod() on its own
12:49 < wrtp> which is just fine for local types
12:49 < wrtp> but probably not something you want to export
12:52 < nictuku> good point
12:54 < Tasser> wrtp, http://golang.org/ - Example Tree Comparison
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12:59 < wrtp> Tasser: try this instead: http://pastebin.com/AnU75Bn4
13:01 < wrtp> unfortunately it doesn't seem as if the examples are in the
repository, so i can't generate a fix
13:01 < wrtp> (the built in function closed was removed from the language
recently)
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13:06 < skelterjohn> morning
13:06 < Tasser> How would you build a large string from templates if you
can't modify strings?  push them into an array and concat that one in the end?
13:07 < skelterjohn> use []byte
13:07 < skelterjohn> you can modify them, and you can use bytes.Buffer to
build them
13:07 < skelterjohn> a bytes.Buffer is a Writer, so you can pass one to
template.Execute
13:08 < wrtp> skelterjohn: i managed to get Go to create a mac window...
13:09 < skelterjohn> cool - link?
13:09 < wrtp> not yet
13:09 < wrtp> it's a bit awkward because you can't directly link against
objective C
13:10 < wrtp> although i managed to get cgo to compile it
13:10 < wrtp> but you can link against a dynamic library that then uses
objective C
13:11 < skelterjohn> right - my intention was to make such a thing and then
also include some C functions in that library
13:11 < wrtp> which isn't ideal because you'll have to distribute the
dynamic library as well as the binary, but it's a start
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13:11 < GeertJohan> Can anyone help me with this please:
http://pastebin.com/JyWPhSdj
13:12 < GeertJohan> compiling go fails on test http
13:12 < xyproto> GeertJohan: looking at it
13:14 < GeertJohan> xyproto: thanks!  I think most of the interesting stuff
is at the last 20 lines...  first it gave an error that it had 192.168.2.22 (my
wlan ip) so I thought, maybe the test expects a 192.168.1.* as "local" address..
but now I set that on my eth0 device, still doesnt work...  so what is the "local"
address it requires for the test to pass?
13:14 < wrtp> GeertJohan: i thought you were able set DISABLE_NET_TESTS
13:15 < wrtp> but that's been removed
13:15 < GeertJohan> this build used to work before (older revision though)
on this same device
13:15 < wrtp> looks like a bug to me
13:15 < wrtp> i'd raise an issue
13:15 < skelterjohn> wrtp it has been replaced
13:15 < skelterjohn> something like
13:15 < skelterjohn> DISABLED_TEST=net
13:15 < skelterjohn> i forget what exactly
13:15 < wrtp> i grepped for disabled and didn't find anything
13:15 < skelterjohn> *something* like that
13:15 < skelterjohn> might not include that word
13:15 < GeertJohan> okay
13:16 < GeertJohan> well I think I'll raise an issue then, cause I cant find
anything about this on the #go-nuts google group either..
13:16 < GeertJohan> and all google search give's me is the source for the
test..
13:17 < wrtp> skelterjohn: CL 4429041 didn't seem to replace it with
anything else
13:18 < skelterjohn> i swear i saw a post about this
13:19 < GeertJohan> skelterjohn: did you maybe see me asking this same
question an hour ago?
13:20 < skelterjohn> no
13:20 < skelterjohn> i was asleep
13:20 < skelterjohn> i'm thinking of something from earlier this week
13:20 < GeertJohan> oh
13:20 < GeertJohan> at google groups ?
13:20 < skelterjohn> yes
13:20 < GeertJohan> searching agian
13:21 < GeertJohan> I do find stuff about test net
13:22 < GeertJohan> but I don't even get to net, it fails at http
13:22 < skelterjohn> that's the problem that DISABLE_NET_TEST addressed
13:22 < skelterjohn> something to do with web proxies
13:22 < skelterjohn> btw you can skip the tests entirely by running
make.bash instead
13:22 < skelterjohn> if you just want to get up off the ground
13:22 < GeertJohan> ohkay
13:22 < GeertJohan> I'll do that then :D
13:23 < GeertJohan> there :)
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13:23 < GeertJohan> now lets hope I get gocode to compile too
13:23 < GeertJohan> last revision didn't work with latest version of go..
13:25 < wrtp> GeertJohan: by the time your test has failed, all of go is
installed and (mostly) working
13:26 < GeertJohan> ohk
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13:33 < GeertJohan> hmmm gocode did compile and install, but when using
eclipse+goclipse the ide feezes directly when I place a dot after "fmt"..  seems
instable :P
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13:35 < GeertJohan> unless I run `gocode -s` in the GOROOT XD
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13:43 < electro> I have a function with (extentList *[]Extent) as
inparamenter, now i would like to append to that slice
13:43 < electro> ive tried most variations and i cant figure it out
13:43 < electro> extentList = append(&extentList, extent)
13:43 < electro> src/image.go:200: cannot slice extentList (type *[]Extent)
13:43 < skelterjohn> *extendList = append(*extentList, extent)
13:44 < skelterjohn> until you dereference it, it's a pointer, not a slice
13:44 < electro> oh, that worked
13:44 < electro> thank you
13:45 < electro> since compiler whined about the slices i assumed the error
was the the right
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13:54 < jeremy_c> Is there a way in a slice to state end -1?  i.e.
mystring[5:-1] ...  doesn't work, slice required uint.  any other way besides
using len() ?
13:55 < skelterjohn> use len
13:55 < jeremy_c> skelterjohn: k, that's kinda what I figured.
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13:56 < wrtp> jeremy_c: it's because using negative offsets is error prone
13:57 < wrtp> (it can lead to hard-to-find bugs, instead of a quick panic)
13:57 < jeremy_c> wrtp: go does do quite a few things to prevent silly
errors.
13:57 < skelterjohn> not including a feature is a fairly passive way to
prevent errors :)
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14:15 < mpl> skelterjohn: and yet, an efficient way :)
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15:27 < GeertJohan> goroutines stop executing if main() is finished ?
15:27 < aiju> yes
15:27 < GeertJohan> okay, so I put this in the end of main():
15:28 < GeertJohan> time.Sleep(9223372036854775807)
15:28 < GeertJohan> fmt.Println("done");
15:28 < GeertJohan> but, I get done with almost no delay..  I should wait
over 200 years before I get to see done..
15:28 < aiju> lol
15:28 < aiju> the number might be too big
15:28 < skelterjohn> are you using the go playground?
15:28 < skelterjohn> but time.Sleep is a noop there
15:28 < skelterjohn> but = because
15:28 < skelterjohn> the "ut" is right next to the "ecause"...
15:29 < GeertJohan> I found time.Sleep in the documentation...
15:29 < GeertJohan> http://golang.org/pkg/time/#Sleep
15:29 < skelterjohn> awesome
15:29 < skelterjohn> yes, i know it's a function
15:30 < GeertJohan> I dont know about go playground..  I just use
eclipse+goclipse which is using 6g to compile
15:30 < skelterjohn> try with something smaller, like 2e9 (which is two
seconds)
15:30 < GeertJohan> ack
15:31 < GeertJohan> that works :)
15:31 < skelterjohn> good!
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15:45 < wrtp> Geert: if you want main to wait forever, you can also do
select{}
15:45 < GeertJohan> wrtp: ok, that doesnt lock up my cpu like for{} does?
15:46 < uriel> the 'proper' way to do it is to wait on a channel and have
the other goroutines signal when they are done by sending on that channel
15:48 < wrtp> GeertJohan: no, it does nothing at all
15:48 < wrtp> uriel: sometimes you want to run forever; or have some other
goroutine call os.Exit
15:50 < aiju> uriel: i thought the proper way to do something is the simple
one
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16:05 < GeertJohan> hehe it wasnt my intention to start a discussion on the
proper way to do it :P however, select{} DOES make it work :)
16:05 < GeertJohan> thx
16:06 * wrtp has a blue box with a black border
16:06 < wrtp> just have to do mouse input now and we'll have mac os native
graphics interaction, woo woo
16:06 < uriel> aiju: note the quotes
16:06 < uriel> around 'proper'
16:07 < aiju> hehe
16:07 < wrtp> might be stupendously slow mind
16:07 < aiju> the KICCHIRI way
16:07 < aiju> (i don't think anyone got that reference)
16:07 < wrtp> depends if i've picked the right API
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16:07 < wrtp> good place to stop for the night
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16:42 < mdxi> the satellite which everyone is all "EINSTEIN WAS RIGHT!"
about was Gravity Probe B
16:42 < mdxi> i got to wondering where Gravity Probe A was, if there had
been one.
16:42 < mdxi> there was.  June 18, 1976
16:43 < mdxi> http://en.wikipedia.org/wiki/Gravity_Probe_A
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18:07 < kimelto> am I the only one who find that the use of the url domain
by goinstall gives us silly import path?  github.com/foo/bar for instance.
18:07 < Bigbear1> how do I check a subscript of a number
18:08 < Bigbear1> num[i]?
18:08 < Bigbear1> or does it need to be a string and which brackets do I
use?
18:09 < skelterjohn> what is a subscript of a number?
18:09 < Bigbear1> like if num = 123
18:09 < Bigbear1> num[0] = 1
18:09 < fzzbt> kimelto: no no, i agree it's silly.
18:09 < skelterjohn> ah
18:09 < skelterjohn> one way would be to turn it to a string
18:09 < Bigbear1> and use square braces?
18:09 < skelterjohn> fmt.Sprintf("%d", num)[0]
18:10 < skelterjohn> that gets you the character '1'
18:10 < Bigbear1> ok ty
18:10 < skelterjohn> fzzbt, kimelto: why do you think it's silly?
18:10 < aiju> Bigbear1: you can just use math ;P
18:10 < skelterjohn> aiju: i didn't want to have to explain any math
18:10 < aiju> 123 / 100 = 1, for instance
18:10 < skelterjohn> aiju: that's just the hundreds digit
18:11 < skelterjohn> not the "first" digit
18:11 < aiju> getting the first digit is not much harder
18:11 < aiju> x := 123
18:11 < aiju> for x > 10 { x /= 10 }
18:11 < aiju> there you go
18:11 < aiju> ehm >=
18:12 < skelterjohn> or...  fmt.Sprintf("%d", num)[0]
18:12 < fzzbt> skelterjohn: because it binds the project import path to a
code hosting service, which means you have to change it if you ever decide to host
your project somewhere else.
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18:12 < skelterjohn> changing where you put it doesn't break anything
18:12 < skelterjohn> once people have installed it and it's working
18:13 < skelterjohn> only if they want the new version
18:13 < skelterjohn> and if they do, well, they're writing code anyway
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18:14 < kimelto> skelterjohn: too long, what happen if the project moves to
a new forge?
18:14 < aiju> you have to change the code any second week anyway
18:14 < skelterjohn> what i just said
18:14 < kimelto> but it should definetly be in a subdir
18:15 < skelterjohn> ?
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18:15 < Bigbear1> what is wrong with my for loops
18:15 < Bigbear1> for i int = 0;i<(len(num)/2);i++ {
18:15 < Bigbear1> expected {
18:15 < aiju> error?
18:15 < skelterjohn> Bigbear1: len() doesn't work on ints
18:15 < Bigbear1> it is a string
18:15 < kimelto> skelterjohn: sorry ;)
18:15 < skelterjohn> for i int = 0
18:15 < skelterjohn> doesn't make sense
18:16 < Bigbear1> var i int = 0?
18:16 < skelterjohn> you can say "i := 0"
18:16 < skelterjohn> i don't think you can put a var inside a for condition
18:16 < skelterjohn> you could also declare i before the for loop
18:16 < Bigbear1> i int := 100
18:16 < Bigbear1> same error
18:17 -!- araujo [~araujo@gentoo/developer/araujo] has quit [Ping timeout: 240
seconds]
18:18 < skelterjohn> that's because you wrote something different than what
i suggested
18:20 < Bigbear1> no int?
18:21 < kimelto> :)
18:23 < Bigbear1> can I type cast (string) (i*j)
18:23 < Bigbear1> passes the value of i*j as a string
18:24 < skelterjohn> no
18:24 < Bigbear1> I got a panic runtime error
18:24 < Bigbear1> how do I type cast then
18:24 < skelterjohn> there is no casting in go
18:24 < skelterjohn> only converting
18:24 < kimelto> you format it with fmt?
18:25 < skelterjohn> to turn a number into a string you can do what i said
with fmt.Sprintf earlier
18:25 < Bigbear1> I am passing it to a function
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18:27 <+iant> strings aren't numbers, so what do you mean by converting a
number to a string?
18:27 <+iant> if you want the printed representation of the nmber, use
Sprintf
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18:29 < Bigbear1> I want to pass a number to a function that accepts strings
18:29 < aiju> use Sprintf
18:29 < aiju> god damnit.  listen to us.
18:29 < Bigbear1> so I need another variable that converts then I pass that
variable
18:30 < xyproto> hm, gonuts.org/pkg has stopped working
18:30 < Bigbear1> so Sprintf doesn't just print it as a string?
18:30 < xyproto> strconv can also be used to convert numbers to strings
18:30 < xyproto> http://golang.org/pkg/strconv/#Itoa
18:30 < skelterjohn> Bigbear1: Sprintf doesn't print anything
18:30 < skelterjohn> Printf prints
18:31 < skelterjohn> Sprintf writes to a string and returns it
18:32 < Bigbear1> if isPalin(Sprintf(i*j)) {
18:32 < aiju> Sprintf("%d", i*j)
18:32 < aiju> as has been mentioned over 9000 times
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18:33 < xyproto> :D
18:33 -!- Bigbear1 [~Cody@d173-181-43-12.abhsia.telus.net] has joined #go-nuts
18:33 < xyproto> just saw the last part of the conversation
18:35 < Bigbear1> ok so I am trying to use Itoa and I have import "strconv"
and it says imported and not used strconv undefined Itoa
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18:36 < xyproto> Bigbear1: import ("strconv")
18:36 < xyproto> Bigbear1: then strconv.Itoa("123")
18:37 < xyproto> Bigbear1: but, as I understand other here have said, this
solution is just as good, or better:
18:37 < xyproto> Bigbear1: import ("fmt")
18:37 -!- oal [~oal@5.79-160-122.customer.lyse.net] has joined #go-nuts
18:37 < oal> Hey
18:37 < kimelto> ho!
18:37 < xyproto> Bigbear1: fmt.Sprintf("%d", 123)
18:37 < xyproto> Bigbear1: and sorry, I meant 123, not "123"
18:37 < oal> Is the Go docs available in pdf for my kindle?  Or are there
any good books out yet?
18:37 < Bigbear1> same thing panic:runtime error
18:37 < aiju> heh Go docs in PDF would be interesting
18:38 < xyproto> Bigbear1: if you paste it at go.pastie.org it should be
possible to figure out what's wrong
18:38 < oal> aiju, so there's *that* much documentation?
18:38 < xyproto> oal: there's a book or two and a few good presentations
available, I think
18:38 < aiju> oal: well, specification, package documentation
18:39 < skelterjohn> it would be a few hundred pages long
18:39 < aiju> i have to admit not having seen a book which looked good, but
i haven't actually read any
18:39 < skelterjohn> i dislike programming books
18:39 < oal> Ah. Well, how do you recommend me learning Go? I'm coming from
the Python world.
18:39 < aiju> there are indeed few good ones
18:39 < xyproto> oal: http://go-lang.cat-v.org/doc/
18:39 < aiju> practice
18:39 < Bigbear1> Deitel and Deitel are good
18:39 < skelterjohn> oal: there are some tutorials on the golang.org site
18:40 < oal> Thanks.  Maybe I should instapaper the tutorial at first and
play with it, then study more of the details later?
18:41 < skelterjohn> seems reasonable
18:41 < oal> xyproto, oh, there's a pdf there.  Downloading it :)
18:41 < Bigbear1> http://pastebin.com/GPGiqzB4
18:42 < oal> Thanks guys!  :-)
18:42 < aiju> just choose some fun project and work on it
18:42 < aiju> somewhat related, "The best way to get familiar with a
terminal is to play games" (UPE)
18:42 < Bigbear1> why am I getting a panic: run time error
18:43 < skelterjohn> Bigbear1: because there is a bug in your code
somewhere, and we can't tell you where because we can't see your code
18:43 <+iant> he just pasted it, though
18:43 < Bigbear1> http://pastebin.com/GPGiqzB4
18:43 < skelterjohn> oh
18:43 < skelterjohn> :)
18:44 < skelterjohn> num [len(num)-i]
18:44 < skelterjohn> when i = 0 this will be a problem
18:44 < skelterjohn> the last valid index on a string of length N is N-1
18:44 < skelterjohn> not N
18:44 < xyproto> Bigbear1: I'm trying to write a working version of your
program.  What is isPalin supposed to do?  Check if the string is a palindrom?
18:45 < skelterjohn> you probably want num[len(num)-i-1]
18:45 < xyproto> *palindrome
18:45 < Bigbear1> yes
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18:46 < xyproto> ah, he didn
18:47 < xyproto> didn't want string conversion, but generate all possible
words
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18:47 < skelterjohn> string conversion is a reasonable way to do that
18:48 < skelterjohn> it involves extra allocations, but has the same runtime
18:48 < xyproto> skelterjohn: but, you can't use Itoa for generating
strings?
18:48 < xyproto> skelterjohn: in that fashion
18:48 < skelterjohn> i don't understand
18:49 < skelterjohn> sure you can?
18:49 < xyproto> skelterjohn: if you want "aaaa", "aaab", "aaac" etc
18:49 < xyproto> skelterjohn: would you use Itoa?
18:49 < skelterjohn> he doesn't
18:49 < skelterjohn> he wants numerical palindromes
18:49 < xyproto> skelterjohn: oh, ok
18:49 < xyproto> skelterjohn: ahhh, I see.
18:49 < xyproto> phew
18:49 < skelterjohn> what i*j are palindromes, for certain i, j
18:49 < aiju> 11 is a good start
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18:49 < skelterjohn> 100 <= i,j < 1000
18:50 < skelterjohn> aiju: i'd probably start at 0
18:50 < Bigbear1> ok so how do I declare a integer with the value 0
18:50 < aiju> all palindromes of a certain length are divisible by 11, 111,
1111, etc.
18:50 < skelterjohn> Bigbear1: var theIntegerWIthValueZero int
18:51 < Bigbear1> var num int := 0
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18:51 < aiju> or something ..
18:51 < skelterjohn> aiju: really?  that seems surprising
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18:51 < skelterjohn> Bigbear1: that is not what i wrote
18:51 < aiju> skelterjohn: i'm not entirely sure
18:51 < skelterjohn> you can't *ever* specify the type and use ":=" at the
same time
18:51 < Bigbear1> ok so I use =?
18:51 < Bigbear1> var num int = 0
18:51 < skelterjohn> aiju: I don't have a reason to disbelieve you besides
not seeing the connection
18:51 < Bigbear1> still wrong
18:51 < aiju> skelterjohn: doesn't seem to be true, there was something like
that
18:52 < skelterjohn> Bigbear1: that works, you can also leave off the =0
since all variables get zero when initialized
18:52 < aiju> Bigbear1: = and := are TWO DIFFERENT THINGS
18:52 < skelterjohn> aiju: maybe quotes would have been in order
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18:52 < skelterjohn> because : = and := look similar
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18:55 < Bigbear1> var num int = 0 works though/
18:55 < skelterjohn> ...
18:56 < skelterjohn> yes.
18:56 < Bigbear1> says num declared and not used
18:56 < Bigbear1> when it is being used
18:56 < Bigbear1> and when I take out the var it has the lines where it is
used saying num undeclared
18:57 < skelterjohn> is this the same program?
18:57 < skelterjohn> because you have a num that is a string in there
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18:59 < xyproto> Bigbear1: http://go.pastie.org/1872641
19:00 < xyproto> Bigbear1: len(s)-i will be len(s)-0 at some point, and
s[len(s)-0] is out of bounds, as the index counts from 0, not from 1
19:00 < Bigbear1> right I need the -1
19:01 < xyproto> Bigbear1: right
19:01 < Bigbear1> http://pastebin.com/1w59fq80
19:01 < Bigbear1> now I just want to print only the largest
19:01 < xyproto> Bigbear1: also, "gofmt -w myfile.go"
19:02 < Bigbear1> it only changed teh second import
19:05 < xyproto> Bigbear1: http://go.pastie.org/1872675
19:07 < Bigbear1> ok but what is wrong with my code?
19:07 < Bigbear1> it says largest is being used but not declared
19:07 < Bigbear1> err largest used without being declared rather
19:08 < xyproto> Bigbear1: I can offer to teach you the meaning of :=
instead, then you will see it
19:08 < aiju> Bigbear1: we tried, several times
19:09 < skelterjohn> Bigbear1: i suggest you refrain from using the ":="
operator
19:09 < skelterjohn> until you know what it means
19:09 < skelterjohn> in the meantime, declare variables using var
19:09 < skelterjohn> and assign them using "="
19:10 < xyproto> Bigbear1: "var x int" and then "x = 2" has roughly the same
meaning as "x := 2"
19:11 < xyproto> Bigbear1: so, "largest := i*j" means "var largest int;
largest = i*j", every time you run the loop.  To fix it, just use "=" instead of
":=" in that place.
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19:11 < xyproto> Bigbear1: you see?
19:12 < Bigbear1> yes
19:12 < xyproto> Bigbear1: yey :)
19:12 < Bigbear1> but why
19:12 < skelterjohn> :|
19:12 < Bigbear1> usually you have a set equal operator
19:12 < Bigbear1> and an initilize operator
19:12 < Bigbear1> and a comparison operator
19:13 < xyproto> Bigbear1: one of the reasons, is that it's tiresome to have
to write "var i int" and then "for i = 0; i < 123; i++" every time you really
just want to write one line
19:13 < xyproto> Bigbear1: if you want to go minimalistic, you don't really
need much syntax at all.  You could do a lot with just 8 instructions.
19:14 < Namegduf> It's mostly useful for mixed cases.
19:14 < xyproto> Bigbear1: + could be 1, ++ could be 2 +++ could be 3, etc.
Why have numbers?
19:14 < xyproto> Bigbear1: some syntaxtic sugar makes people happy
19:14 < Namegduf> f, err := ...; ...  bar, err := ...
19:14 < xyproto> *syntactic sugar
19:15 < Namegduf> It's syntactic sugar for type inference that allows a lot
of code to be more compact, as opposed to rare bits of code.
19:15 < Namegduf> *for a type inferencing var
19:16 < xyproto> Bigbear1: Go is very anti-sugar for some ideas, though, and
pro others.  Like all languages.  As I was told when I started out with Go, the
bike shed has already been painted.
19:16 < xyproto> And who wants an unpainted bike shed?
19:16 < xyproto> Not me.
19:17 < Namegduf> I think Go tends to be anti-sugar except where it's really
really helpful in a LOT of code.
19:17 < Namegduf> Most proposed sugar seems to affect only occasional uses
of a construct.
19:17 < xyproto> How about you, skelterjohn, do you want an unpainted bike
shed?
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19:18 < skelterjohn> wat
19:18 < xyproto> skelterjohn: I thought so.
19:18 < skelterjohn> i wasn't paying attention
19:19 < xyproto> skelterjohn: I was just talking about how the bikshed of
syntactical sugary goodness had already been painted.
19:19 < skelterjohn> i hate metaphors
19:19 < xyproto> skelterjohn: every good metaphor is like...  a car
19:19 < skelterjohn> that's a simile
19:20 < xyproto> similes are cars too
19:20 < skelterjohn> your face is a car
19:20 < xyproto> :D
19:20 < xyproto> skelterjohn: I don't get it
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19:23 < xyproto> Bigbear1: Did you figure out everything?
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19:26 < Bigbear1> How do I format a really long if statement without the
extra round brackets it adds a semi colon at the end of each line
19:26 < Bigbear1> gofmt didn't help either
19:27 < Bigbear1> it said found IDENT\
19:27 < TheMue> Bigbear1: Has it to be so long?
19:27 < xyproto> Bigbear1: in general, you don't always need () but it's
handy to throw in {} everywhere
19:28 < TheMue> Bigbear1: That's not very maintainable.  So can't you split
it in boolean descissions before?
19:28 < xyproto> Bigbear1: if you want really long lines, I think you can
use just "\" at the end of the line, if I remember correctly
19:29 < skelterjohn> xyproto: i don't think so
19:29 < xyproto> nope, forget what I said
19:29 < xyproto> \ does not continue lines on the next line
19:29 < skelterjohn> you can split a line into multiple lines by choosing
carefully where to put the carriage return
19:29 < xyproto> Bigbear1: what's wrong with just having a really long line?
19:29 < skelterjohn> can't be immediately after an ident
19:29 < xyproto> skelterjohn: good point
19:29 < skelterjohn> but it can be after, for instance a comm
19:29 < skelterjohn> a
19:30 < xyproto> Bigbear1: you can assign values to variables to make if
sentences shorter
19:30 < TheMue> I would do:
19:30 < TheMue> c1 := ...
19:30 < TheMue> c2 := ...
19:31 < TheMue> c3 := ...
19:31 < TheMue> if c1 && c2 && c3 { ...  }
19:31 < TheMue> c1 to c3 are criteria 1 to criteria 3
19:31 < TheMue> with boolean expressions behind it
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20:56 < nictuku> What do you folks use to replace struct data fields for
interfaces?  "getter" and "setter" methods?
20:56 < aiju> rethink our interface
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21:30 < tylerl> How do I get the error number off a call to os.Stat()?  I
want switch between error causes.
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21:34 < tylerl> hello?
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21:35 < skelterjohn> hi
21:35 < skelterjohn> um, not sure off the top of my head
21:35 < tylerl> ok, thanks anyway
21:35 < skelterjohn> check out the Stat code
21:35 < skelterjohn> see what it returns
21:35 < skelterjohn> it's possible it returns os.NewError("some useful
message")
21:35 < skelterjohn> in which case the only thing you can compare against is
that string
21:36 < tylerl> skelterjohn: I'm not particularly interested in a useful
message.
21:36 < skelterjohn> lol
21:37 < aiju> tylerl: os.SyscallErrno
21:37 < aiju> i'm not entirely sure what you're trying to do, though
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21:38 < tylerl> aiju: I'm calling os.Stat() which can fail due to a number
of different causes (not found, no permission, etc.) and I'm trying to address
each situation separately
21:38 < aiju> yeah, but why
21:39 < skelterjohn> os.Stat returns a os.PathError
21:39 < skelterjohn> which has an Error field
21:39 < aiju> in any case there should be enough constants in os
21:41 < tylerl> aiju: but how do i get at the particular constant associated
with a returned error?
21:41 < skelterjohn> the error you get is a PathError which has an Error
field - the Error is an interface holding a syscall.Error
21:42 < aiju> tylerl: err == os.Eperm?
21:42 < aiju> not entirely sure
21:42 < skelterjohn> err
21:42 < skelterjohn> syscall.Error is another interfac
21:42 < skelterjohn> e
21:43 < skelterjohn> what it actually is is buried somewhere in the syscall
source
21:43 < skelterjohn> too much effort right now
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22:28 < kimelto> mmh I am getting garbage at the end, when a Reader returns
EOF.  is the buffer is small, say 10, it's fine
22:31 < kimelto> http://go.pastie.org/1873358
22:34 < delinka> you're ignoring the int in the return
22:35 < kimelto> oh I thought len(buf) would do the trick
22:35 < delinka> it'll still be 1024.  it doens't reallocate the buffer.
22:35 < delinka> it just fills it.
22:36 < kimelto> len() not cap()
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22:39 < delinka> I see an array.  did I miss the slice based on the array
some place?
22:40 < kimelto> you mean that buf is an array and not a slice?
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22:41 < delinka> right
22:42 < delinka> ok, that really might not be entirely accurate, but still
the Read() call wouldn't magically change the slice's capacity
22:43 < delinka> if it was returning a slice, it could return to you the
slice with the newest data in it
22:44 < delinka> but since there's an int in the return values, you can then
create your own slice from the array, and output *that*
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22:57 < kimelto> the thing which I dont understand is since a slice has a
len, why Read() returns the len and do not change the len of the slice...
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22:59 < delinka> I can't answer the "why" but my guess would be to keep
parity with similar APIs in C
23:05 < Namegduf> Because the slice is passed by value.
23:06 < Namegduf> A slice is a little struct, not a little pointer to a
struct.
23:06 < Namegduf> If you change the len of one it doesn't change the length
of other copies of the slice.
23:07 < Namegduf> It's like asking, why if you pass in a number, doesn't it
change that number instead of returning a new one.
23:08 < delinka> this is where my brain takes a moment to process things ...
it passes the *slice* by value so changes to the slice "struct" would by useless,
but since the slice *references* the original array elements, the original array
elements change in value
23:09 < delinka> s/by/be/
23:09 < Namegduf> Yep.
23:09 < Namegduf> Slightly annoyingly, I just got a better way to explain
it.
23:09 < Namegduf> You *can't* change the length of a slice.
23:10 < Namegduf> You can only slice it and make a new one.
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23:10 < Namegduf> If you assign that new one to the same place the old one
was, it overwrites, but it doesn't affect any other places still storing the old
one.
23:10 < Namegduf> That way, things can slice up the slice they're given
without affecting parents all they like.
23:12 < kimelto> and how can I decrease the len of a slice btw?
23:12 < Namegduf> s = s[:newlen]
23:12 < kimelto> how I see
23:13 < kimelto> so it kinda create a new one and the old one is garbage
collected, right?
23:13 < delinka> yes
23:14 < Namegduf> Well, no.
23:14 < kimelto> so I got the behavior I want with buf = buf[:n], thanks
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23:15 < delinka> why would that not create a new slice?
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23:15 < Namegduf> Slices are structs, not pointers to structs.
23:16 < Namegduf> You just overwrite the old value of the struct with a new
value of it, nothing needs GCing
23:17 < kimelto> now I wonder if net.Read() can return a n < len(buf)
before EOF.  it is a blocking call right?
23:18 < kimelto> because if that's the case I am constantly decreasing my
slice
23:18 < Namegduf> Yes, it can.
23:18 < Namegduf> You should resize it back to the size of cap()
23:19 < kimelto> ok, good to know
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23:20 < kimelto> I think I am starting to get it :p
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23:51 < whitespacechar> I'm trying to write my first go program ...  running
into newbie problems.  Mac 64 bit; go installation went well; env vars are set.
23:51 < whitespacechar> But when I do an import statement, I get
"bloom.go:11: syntax error near runtime"
23:52 < whitespacechar> Is this a common error?  What am I doing wrong?
23:52 < skelterjohn> pastebin the code
23:52 <+iant> or at least show us line 11
23:53 < whitespacechar> http://pastebin.com/EeJSHGER
23:53 < skelterjohn> are you sure that's what you're compiling?  I don't see
"runtime" anywhere
23:54 < whitespacechar> well, exactly.
23:54 < skelterjohn> also, if you import fmt you have to use it
23:54 < skelterjohn> so that's one error
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--- Log closed Sat May 07 00:00:50 2011