--- Log opened Tue Sep 21 00:00:07 2010
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01:26 < joc1985> hi
01:27 < joc1985> I have the following signature MatrixMultiply(data
*MatrixData, reply *[][]int)
01:27 < joc1985> When I try to call *reply[data.Start][j] +=
data.Matrix1[data.Start][k] * data.Matrix2[k][j]
01:27 < joc1985> I get invalid operation: reply[data.Start] (index of type
*[][]int)
01:28 < joc1985> why isn't it letting me assign to the slice?
01:30 < joc1985> anyone have the slightest idea?
01:31 < Eridius> joc1985: maybe you want (*reply)[data.Start][j]?
01:32 < joc1985> awesome Thanks Eridius
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03:17 < nsf> yay!  closed all known issues for gocode
03:19 < nsf> or should I say documented issues, I know few more :((
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06:20 < plexdev> http://is.gd/fkI4V by [Nigel Tao] in
go/src/pkg/exp/nacl/av/ -- exp/nacl/av: update color to max out at 1<<16-1
instead of 1<<32-1.
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06:52 < plexdev> http://is.gd/fkKpp by [Alex Brainman] in go/src/ --
env.bash: fix building in directory with spaces in the path.
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07:57 < ncopa> hi
07:57 < ncopa> is there support for Go in gcc-4.5?
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08:06 < tux21b> hmm, assuming I have a type "Literal struct { Value
interface {}}" (which should pack any kind of literal value, eg.  integers,
strings, etc).  Is it possible to avoid the struct with a single value only?
08:07 < tux21b> "type Literal interface {}" isn't working, since it defines
an interface and not an "any type"
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08:24 < wrtp> tux21b: i'm not sure i understand the question.
08:24 < wrtp> what do you mean be "avoid the struct"?
08:24 < wrtp> s/be/by/
08:24 < nsf> tux21b: I think interface is not just an interface it's a value
also
08:25 < nsf> see package "reflect" it has some usages of the interface as a
value
08:25 < tux21b> wrtp: assuming I have "type IntLiteral { Value int }".  Then
i can simplify the type to "type IntLiteral int".
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08:26 < nsf> for example reflect.*Value types has method "Interface" which
returns interface as a value :)
08:26 < wrtp> tux21b: why bother defining a different type each time?
08:26 < wrtp> tux21b: just use interface{}
08:26 < wrtp> then: var intLiteral interface{} = 99
08:27 < tux21b> the thing is i am writing some kind of AST for an
interpreter.  with an Node interface which has an Accept(visitor) method.
(visitor pattern)
08:27 < wrtp> ok, that's fine
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08:28 < wrtp> if you have type IntLiteral int; then you can define an Accept
method on IntLiteral if you want
08:28 < tux21b> Literals are some kind of Node, so I need a "func (l
Literal) Accept(visitor Visitor)" method to be a valid Node
08:28 < tux21b> exactly
08:28 < wrtp> so what's the problem?
08:29 < tux21b> but when I have a general type »type Literal interface {}«,
then I can't define an Accept method anymore
08:29 < wrtp> in that case, just define a struct as you had earlier
08:29 < tux21b> »type Literal struct { Value interface{} }« on the other
hand is working
08:30 < wrtp> you can't define new methods on interface types
08:30 < tux21b> yes, i am just interested if it's possible to define an
actual type for interface {} :)
08:30 < wrtp> you can, but you can't define new methods on it
08:31 < wrtp> see http://golang.org/doc/go_spec.html#Method_declarations
08:31 < tux21b> hmm, I don't like that.  Now I've to write .Value all the
time
08:31 < wrtp> make it .V and it's not so bad
08:32 < wrtp> "The base type must not be a pointer or interface type and
must be declared in the same package as the method."
08:32 < wrtp> BTW putting it in a struct means you can also add extra info
if you want (for instance source location of the literal)
08:34 < tux21b> yeah, I probably need a struct anyway (at a later stage),
but imho is the language/syntax not working as expected
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08:36 < tux21b> on the one side, it creates new types which consists of an
existing one, on the other hand it declares interfaces, instead of a type which
consists of an interface
08:36 < wrtp> tux21b: there's a good reason for not letting methods be
defined on interface types.
08:36 < tux21b> what do you think?  regardless of the actual problem ;)
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08:37 < wrtp> tux21b: what would the method set of the resulting type be?
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08:39 < tux21b> the fact is, i don't want the new type to be an interface at
all.  I just want a regular type, which can take "any object".  (bypassing the
typechecking of Go *g*)
08:41 < Namegduf> That doesn't make sense.
08:41 < Namegduf> A type is two things:
08:41 < Namegduf> 1) A sized block of memory.
08:41 < Namegduf> 2) A convention for interpreting and using said block.
08:42 < Namegduf> You can have a type that can point to any other type;
interface{} does this.  But you can't have a variable to which you can assign any
type, because types are different sizes.
08:43 < tux21b> ah, ok.  that's a good explanation
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08:45 < tux21b> ok, thank you both, at least I am now understanding why I
can't do what i want :)
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08:57 < wrtp> Namegduf: yeah, and languages that allow this have the same
size for every type.
08:59 < Namegduf> wrtp: Well, Python does it by having every variable be a
reference.
08:59 < Namegduf> And all references are the same size.
08:59 < wrtp> Namegduf: i'm not sure ints are references in python
08:59 < Namegduf> wrtp: Python doesn't have ints.
09:00 < Namegduf> Well, not as an explicit, declared type.
09:00 < wrtp> if i say x = 56, does it do an allocation?
09:00 < Namegduf> I am not familiar with the implementation of Python
sufficiently to answer.
09:00 < wrtp> i think it probably uses tagged pointers like most dynamic
languages
09:01 < wrtp> i.e.  a few bits of the reference are reserved to specify
common types (like small integers)
09:01 < Namegduf> That'd be possible.
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09:02 < wrtp> so in fact not all types are references...
09:02 < Namegduf> Congratulations, point made, you know more about the
innards of Python than me.
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09:04 < Namegduf> But, yeah, languages that allow that play games to allow
it.
09:07 < wrtp> actually, it looks like i'm wrong:
http://evanjones.ca/python-memory.html
09:07 < wrtp> but there you go
09:08 < wrtp> don't use python if you want efficiency :-)
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10:41 < plexdev> http://is.gd/fl2P6 by [Andrew Gerrand] in
go/misc/dashboard/builder/ -- misc/dashboard/builder: fixes and improvements
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11:29 < plexdev> http://is.gd/fl6Ft by [Rob Pike] in go/src/pkg/regexp/ --
regexp: delete Iter methods
11:34 < theshish> I think all the integers in Python less than ~110 are
preallocated and refer to the same objects every time they're used
11:36 < theshish> oh, it's somewhere between 200 and 300
11:36 < theshish> you can test with something like "200 is 20 * 10", which
is true, while "300 is 30 * 10" is false
11:38 < nsf> 256?
11:38 < nsf> btw, interesting article
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11:38 < nsf> Go isn't far from that if I understand it correctly
11:39 < nsf> which is sad
11:39 < theshish> yeah, looks like 256.  Though I don't remember it being
that last I checked
11:39 < nsf> 256 makes sense because you can process 1-byte stuff faster
11:40 < Namegduf> nsf: At least Go has a stack.
11:40 < Boney> that only makes sense if your objects are heavy.
11:40 < Boney> all the Go metrials I've read/seen in seminars say that
objects are much ligher waight.
11:40 < Boney> so it doesn't make sense to do it that way.
11:41 < nsf> Namegduf: which you can't even use, because of escape analysis
11:41 < Boney> (it does make sesne for python).
11:41 < nsf> one function and you have no stack anymore
11:41 < nsf> :(
11:41 < Namegduf> I'm hoping that gets improved.
11:41 < nsf> me too
11:41 < Namegduf> It seems doable.
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12:07 < wrtp> nsf: i'm not sure that's true.  it's closures, not functions,
and it only applies when you take the address of a variable, and then only to the
variables that have their address taken.
12:08 < Namegduf> wrtp: The problem is that if Go passes a variable to
another function, it can't guarantee THAT function doesn't use it in a closure.
12:09 < Namegduf> Or store the value somewhere.
12:09 < Namegduf> Er, or take the address of the value and store the address
somewhere.
12:10 < wrtp> Namegduf: that only applies if you take the address of the
variable
12:10 < Namegduf> Hmm, true.  That precludes most use of methods, though.
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12:21 < nsf> methods and slices and maps, etc
12:21 < nsf> tons of use cases
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12:30 < wrtp> nsf: i don't undertand.  if you do a method on an object in a
slice, the slice is heap allocated anyway so it doesn't affect anything
12:31 < wrtp> though in general i agree that it would be great if gc could
to interprocedural escape analysis
12:31 < wrtp> i think it might come when they do inlining
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12:32 < Namegduf> wrtp: If you do a method which mutates something at all,
then the method works as a function which gets passed a pointer to the variable
it's operating on.
12:32 < Namegduf> This counts as taking the address of said variable.
12:32 < nsf> wrtp: yes, but the slice is a pointer to an array
12:33 < nsf> and you can't really allocate an array on the stack and get a
slice to it
12:33 < nsf> because it is considered as escape
12:34 < wrtp> sure.
12:34 < wrtp> same thing applies to closures that are only called within the
call frame.  they shouldn't need a heap allocation.
12:34 < nsf> true
12:34 < Namegduf> Unless the closure itself constructs a closure
12:35 < wrtp> (of course, some architectures might object to putting code on
the stack)
12:35 < Namegduf> I do not believe closures involve putting code on the
stack.
12:35 < Namegduf> Or, rather, putting code anywhere.
12:35 < wrtp> Namegduf: i don't think that should be a problem, unless the
closure's closure escapes
12:35 < wrtp> Namegduf: they do in go
12:35 < Namegduf> They do?
12:35 < Namegduf> I thought it simply put a block of variables somewhere.
12:36 < wrtp> Namegduf: because a closure call is just like a regular
function call
12:36 < wrtp> Namegduf: so there's nowhere to hang that block of variables
off except the adress of the function
12:36 < Namegduf> Why would that involve putting the code on the stack?
12:36 < Namegduf> Go isn't interpreted.
12:36 < Namegduf> The closure is compiled at compiletime.
12:36 < wrtp> currently it puts code in the heap
12:37 < wrtp> Namegduf: the body of the closure is, but the runtime computes
some code that calls the closure with its closed-over variables.
12:37 < wrtp> that code is generated at runtime
12:37 < Namegduf> Huh.
12:38 < Namegduf> I don't understand why the closure isn't just created as a
function with an additional parameter which points to wherever said closed-over
variables are allocated.
12:38 < wrtp> for example see: $GOROOT/src/pkg/runtime/386/closure.c
12:38 < wrtp> how would the caller of the closure know what to pass as that
additional parameter?
12:39 < Namegduf> Hmm, good point, the closure has to be usable with the
same calling convention for its remaining parameters as the rest.
12:40 < Namegduf> *as non-closures
12:40 < wrtp> yup
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12:41 < wrtp> another approach would be to make every function pointer a
pair of (context, code-pointer)
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12:41 < wrtp> but that means all normal functions pay the closure price
12:42 < wrtp> (when called through a function pointer or as an interface
method)
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12:46 < nickaugust> when do closures occur in go?  function within a
function?
12:46 < wrtp> nickaugust: function literals
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12:47 < wrtp> e.g.  func Foo() {f := func(){fmt.Printf("in a closure now")};
f()}
12:48 < nickaugust> interesting.  i didnt know go had function literals
12:48 < nickaugust> is that the same as lambda functions?
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12:50 < wrtp> nickaugust: yup
12:50 < wrtp> they're used quite a bit
12:51 < nickaugust> wrtp: i'll start using them today :)
12:52 < wrtp> nickaugust: i think you should :-)
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12:55 < nickaugust> well that works pretty nice :) thanks wrtp
12:56 < wrtp> np
12:57 < wrtp> PS it's worth having a good read of the language spec.  there
a lots of little things which work pretty nice that aren't immediately evident.
12:59 < nickaugust> yeah i read it once but i should do it again now that i
have a feel for the language.  so i can see the variables from the outside
function but not the vars inside the function literal from the outside?
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13:01 < wrtp> nickaugust: yes, that's right.  standard lexical scoping
rules.
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14:02 < plexdev> http://is.gd/fljg2 by [Ian Lance Taylor] in
go/src/pkg/syscall/ -- syscall: Use vsyscall for syscall.Gettimeofday and .Time on
linux amd64.
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15:22 < gmilleramilar> what's the best way to export a func that takes a
string to c?  should it take a regular "go" string as a parameter or something
else?
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15:24 < exch> a regular go string.  the function should convert to/from
Cstring internally
15:25 < exch> packages that import your C bindings don't have acces to the
'C' bits
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15:28 < gmilleramilar> when I call it from C, how do I convert a ""-string
into a go string?
15:29 < exch> mycstr := C.Cstring("yay"); mygostr := C.GoString(mycstr);
C.free(unsafe.Pointer(&mycstr))
15:30 < exch> 'mycstr' is of type *C.char
15:30 < gmilleramilar> that's on the go side right?
15:30 < exch> yes
15:30 < gmilleramilar> I'm talking about exporting the func and calling it
from C
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15:31 < gmilleramilar> so on the go side I have //export CVisibleFunc
15:31 < gmilleramilar> func CVisibleFunc(s string) ...
15:32 < exch> Not sure.  I never tried that.  Either there is some
cgo-specific header you can include which defines the Cstring() and Gostring()
functions, or define the funciton on the Go side to take *C.char instead of a
regular Go string
15:32 < gmilleramilar> yeah, I was wondering if there was a preferred
method.
15:32 < gmilleramilar> will try the *C.char.  thx
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15:51 < joc1985> I have the following make file
15:51 < joc1985> include $(GOROOT)/src/Make.inc
15:51 < joc1985> TARG=jose/prj_driver
15:51 < joc1985> GOFILES=\
15:51 < joc1985> server/server.go\
15:51 < joc1985> prj1_driver.go\
15:51 < joc1985> include $(GOROOT)/src/Make.
15:51 < joc1985> package server; expected main amongst others
15:51 < joc1985> server is just a package wth some functinos in it but no
main
15:52 < joc1985> i am including it in prj1_driver
15:52 < joc1985> any clue how to make this work (no pun intended)
15:54 < exch> the last line should have '.pkg' as the extension for the Make
file you include
15:54 < joc1985> it does
15:54 < exch> also, since 'prj1_driver.go\' ends with a line-continuation
character '\', you should probably ad a newline between that line and the last
include
15:54 < joc1985> didn't copy right
15:54 < exch> ah
15:55 < exch> both of those go files should also have the same package name
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15:55 < exch> you don't have to include it in prj1_driver
15:55 < joc1985> well server.go its a different package that I need to use
inside of prj_driver (its used in other programs too)
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15:56 < exch> then you need to compile it independantly
15:56 < exch> eg: a separate makefile for the server package content
15:57 < joc1985> oh I see
15:57 < joc1985> thank you!  :-D
15:57 < exch> np :)
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16:00 < exch> joc1985: this video should give you a good idea of how it's
supposed to work http://www.youtube.com/watch?v=jDWBJOXs_iI&feature=related
16:01 < joc1985> aweomse!
16:01 < joc1985> *awesome!  thanks
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16:10 < sin3141592> Is there a function that simply reads a line from stdin?
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16:12 < homa_rano> fmt.Scanln reads a line, and interprets it
16:12 -!- Venom_X [~pjacobs@74.61.90.217] has quit [Quit: Venom_X]
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16:14 < sin3141592> So, is the following the way to go?  n, err :=
fmt.Scanln("%s", line)
16:14 < sin3141592> Is that good practice?
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16:15 < homa_rano> I feel like there's another more direct way, but I can't
remember what it is
16:15 < joc1985> inputReader = bufio.NewReader(cmd.Stdout)
16:15 < joc1985> input, _ = inputReader.ReadString('\n')
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16:16 < exch> no need for the "%s" bit.  Scanln() takes pointers to
variables you want to fill
16:16 < exch> var line string; n, err := fmt.Scanln(&line)
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16:17 < sin3141592> Thank you very much.
16:18 < joc1985> thank you exch that video helped a lot, is there a way to
make a make file that will produce x.out (executable) in the local directory?
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16:19 < exch> the standard makefile will do that.  the TARG variable will be
the name of the executable
16:21 < joc1985> if I do make install its drops it in my go/pkg/
installation
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16:21 < joc1985> and if not it buts it in a _obj folder
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16:21 < exch> yup.  the install bit is needed if you want other code to find
the package.  Unless you explicitely specify the relative path to that _obj folder
in the import statement
16:22 < joc1985> cool, it seems like the .a file it generates is not
excecutable, any way to tell make to do that?
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16:22 < Namegduf> You need to use the makefile for programs, not for
packages.
16:22 < Namegduf> A .a is a library.
16:22 < joc1985> taht's what I thought, where is that make file located?
16:23 < joc1985> I utterly suck a make files :(
16:24 < exch> a package makefile has 'include $(GOROOT)/src/Make.pkg' as the
last line.  A executable has 'include $(GOROOT)/src/Make.cmd'.  (Note the
different Make extension).  that's all :)
16:24 < exch> those includes will take care of the rets for you
16:24 < joc1985> fantastic!
16:25 < exch> This may be helpful to:
http://github.com/jteeuwen/go-example-multipkg
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16:28 < Namegduf> I didn't find the default makefiles very good for a large
project, but it's easy to include some of the base stuff and write your own.
16:29 < exch> It's a shame you can't really overwrite the existing install
rule for some reason.  If I specify my own , both the original and the new one are
executed.  Which kind of defeats the purpose of installing packages in a local dir
instead of the go pkg directory
16:30 < exch> I'm probably just missing something though
16:30 < Namegduf> I also had trouble figuring out how to assemble a larger
project which properly handled dependencies using the default makefiles, but that
might just have been my lack of proficiency with Make.
16:32 < Namegduf> The problem is that even if you do a complete rebuild
anyway, if they aren't built in dependency order, they'll try to build against the
old versions of the package still in $GOROOT
16:32 < exch> yup
16:32 < Namegduf> Which results in type errors.
16:32 < exch> It kinda forces you to do a make clean before every build
16:33 < Namegduf> While it was fairly easy to simply make each package a
target depending on all its files and the other packages it uses.
16:33 * Namegduf even wildcarded it, so the build simply includes "All .go files
in the package's directory"
16:33 < Namegduf> And let Make do it all right.
16:34 < Namegduf> I wish Go had a dedicated build tool, really, though.
16:34 < Namegduf> The import paths provide data which could generate the
dependencies for building automatically.
16:35 < tux21b> my project isn't that big right now, but i've solved all my
problems related to outdated builds by sorting the filenames in GOFILES
correctly....
16:35 < exch> There's a few out there, but I'm not eager to use them.  Even
my own build tools.  They just add another dependency to the project
16:35 < Namegduf> tux21b: I have multiple packages, so that's not
applicable.
16:35 < Namegduf> exch: That's the problem of leaving such to the community,
I think.
16:36 < exch> My own tool uses the go/parser and go/ast stuff to process the
import statements and sort files/packages that way.  Including build dependencies
16:36 < tux21b> Namegduf: ok, haven't tried that yet, but it at least works
for single packages :)
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17:01 < joc1985> so there is no way to override the install?
17:02 < exch> You can add your own rule, but the original copy will still be
performed.  The only solution I found is to add a new rule with a different name.
something like 'inst'.  and then just call 'make inst' instead of 'make install'
17:02 < exch> hardly ideal though
17:03 < nsf> or you can make a makefile that calls other makefile
17:03 < nsf> and override everything you need
17:03 < joc1985> i see
17:03 < joc1985> Thanks!
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21:47 < mpl> anyone familiar with go-gtk or even gtk?
21:48 < mpl> trying to figure out what's the best way to replace an image
with another in a box.
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--- Log closed Wed Sep 22 00:00:07 2010