--- Log opened Sun Nov 14 00:00:15 2010
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04:57 < crazy2be> how can i have a literal { in a file parsed by the
template package?
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06:23 < micrypt> Hi, I can't seem to remember the syntax for dynamically
building a Map from a channel.  Any help?
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06:27 < cbeck> I'm not sure what you mean
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06:28 < micrypt> cbeck: Just a second.  I'll put what I have up in a paste
bin.
06:30 < cbeck> I'm on a phone atm, afraid I may not be much help
06:30 < micrypt> cbeck: That's okay.  http://pastie.org/1296468
06:30 < micrypt> cbeck: I'm trying to build a map instead of just printing
out items...
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07:01 < micrypt> Syntax help...  an array of maps?
07:05 < KirkMcDonald> Array?  Or slice?
07:05 < KirkMcDonald> []map[key_t]value_t
07:06 < KirkMcDonald> (If you meant a slice.)
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08:13 < TheSeeker> hmm, godag, and gobuild are all giving me the same access
denied error, after successfully generating a .8 file.  I'm starting to think
there's a bug somewhere.
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08:23 < TheSeeker> hmm, 8g is exiting with status 1 in cmd shell, and status
0 in cygwin shell.
08:28 < TheSeeker> argh, no, it's gobuild exiting with status 1, 8g is fine.
%_o
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11:12 < al-maisan> Hello there!  How does one "open" a directory?  os.Open()
only seems to work with files..  I would like to use
http://golang.org/pkg/os/#File.Readdirnames
11:13 < al-maisan> ..  but cannot figure out how to construct a (*File) for
a directory..?
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11:34 < adu> sounds about right
11:34 < adu> usually directory openers are called something different, like
OpenDir
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11:38 < KBme> no
11:39 < KBme> it's as simple as http://pastie.org/1296749
11:39 < KBme> almaisan-away: check that code ^
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11:41 < KBme> you have FileInfo.IsDirectory to check whether the file is a
directory
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12:09 < lars9> is anyone using GO outside of google?
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12:22 < exch> I presume most people in here do, and they don't all work for
google
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13:07 < KBme> what is a CL?
13:07 < KBme> i'm guessing it's a codereview, so why is it not CR?
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14:35 < madari> KBme: change list
14:36 < KBme> sorry?
14:36 < KBme> ah ok
14:36 < KBme> weird, why change list?
14:40 < madari> that's just what they are called...  you do code reviews on
a list of changes
14:41 < nsf> another name: "patch set" and its abbrev (PS) looks not exactly
right
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14:43 < madari> from wikipedia: "On many version control systems with atomic
multi-change commits, a changelist, change set, or patch identifies the set of
changes made in a single commit.  This can also represent a sequential view of the
source code, allowing the examination of source "as of" any particular changelist
ID."
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14:44 < siyb> so if i create a package p and want to use methods / functions
in other packages (files?) i have to provide the full reference p.foo() ?
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14:49 < madari> siyb: you don't have to, but usually it is a good practice
to do so.  when importing packages, you can define the target "namespace" like:
import _ "mypackage" or import analias "formygreatpackage"
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14:49 < siyb> madari: i know that packages can be aliased, but then i would
have to use alias.function() right?
14:50 < siyb> perhaps you know some _quality_ tutorial for go, the official
one sucks imho ;)
14:50 < madari> siyb: if you use the first syntax (import _ "...") then the
package would be imported to the current namespace so you could just use
function() directly
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14:53 < madari> or was it import . "p" ...  i don't remember :(
14:53 < siyb> madari: perhaps i am doing something wrong: i created a
package server with a type Server and imported that in my mainfile using import
"./server", when i try to create a new instance with: var myServer *Server =
new(Server) i get: undefined: Server
14:53 < madari> http://golang.org/doc/go_spec.html#Import_declarations
14:53 < siyb> thanks
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14:54 < siyb> ahh ok
14:54 < madari> i hope that explained it =)
14:55 < siyb> it sure does, coming from java i was under the impression,
that a normal import should grant access to the types in question ;)
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16:18 < sxs> hello
16:23 < TheMue> moo
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17:31 < sxs> I try something like: return foo.bar == nil The compiler
failes, because cannot convert nil to type MyStruct
17:32 < KBme> sxs: check how os.Error does it, it can be compared to nil
17:32 < sxs> i want to check in a function IsNil() if bar has a struct
MyStruct or nothing.
17:32 < sxs> KBme: ok thx
17:32 < KBme> yeah, i was actually wondering about how it did that myself
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17:33 < Tv> only pointers can be nil
17:33 < KBme> ah!
17:33 < KBme> there you go
17:33 < sxs> TV: How can i check non-pointers if they are setted?
17:34 < KBme> they have to be
17:34 < Tv> sxs: as yourself, what's the "non-set" value..
17:34 < KBme> they can be empty though
17:34 < Tv> you mean "zero value" not "empty"
17:34 < KBme> oh, right
17:34 < KBme> yep
17:34 < Tv> *ask yourself
17:35 < Tv> e.g.  var foo int; // foo is now 0
17:35 < sxs> Tv: Good questin.  I'm absolutely new with Go and come from OOP
with Java.  There i have members.  Some of them can be 'null'
17:35 < sxs> so, now i try to figure out how does this wors in Go
17:35 < Tv> sxs: http://golang.org/doc/go_spec.html#The_zero_value
17:35 < KBme> for a string it would be "", for an int 0, for a struct{int,
string} it would be MyType{0, ""} is that correct Tv?
17:36 < Tv> KBme: yeah
17:36 < sxs> ahhh
17:36 < sxs> thx a lot
17:36 < sxs> type T struct { i int; f float; next *T }
17:36 < sxs> thats it
17:36 < sxs> but what about type T struct { i int; f float; next T }
17:36 < sxs> what will T be?
17:36 < Tv> sxs: impossible?-)
17:37 < Tv> think about it, it's a struct that contains itself that contains
itself
17:37 < Tv> that'd definitely need to be a pointer
17:37 < sxs> ah, sorry, too fast copy paste
17:37 < sxs> lets say type T1 struct { i int; f float; next T2 } what will
T2 be?
17:38 < Tv> sxs: zero value for structs is the zero value of all its members
17:38 < Tv> sxs: if you want all off next to be able to be null, make it a
pointer
17:38 < sxs> ah, ok.  an 'empty' T2 and not nil
17:38 < KBme> sxs: T1{0, 0.0, T2{..}} i would guess
17:38 < Tv> sxs: or have a boolean that tells you whether it's set
17:38 < sxs> Tv: thx a lot
17:39 < sxs> thats totlay different to java ;)
17:39 < sxs> theres everything null
17:39 < Tv> in java, everything is a pointer
17:39 < ibiwan> hey all...  I'm trying to figure out how to make use of
interfaces, but almost all sample code I can find avoids it like the plague...  do
you know of a project that makes integral use of interfaces?
17:39 < KBme> golang ;)
17:39 < ibiwan> for reference, my own attempts lie in making simple data
structures, linked lists and the like
17:39 < sxs> yes, but if you do not assign something to a mmeber the pointer
is nul
17:39 < Tv> ibiwan: have you read
http://golang.org/doc/effective_go.html#interfaces_and_types ?
17:40 < sxs> you helped me a lot :)
17:40 < ibiwan> I have
17:41 < ibiwan> I'm trying to implement a "node" type that I can use at will
for SLLs, DLLs, trees, etc...  so for my "snode" (singly-linked-list node)
interface, I only need one function:
17:41 < Tv> ibiwan: the packages that come with go use a lot of interfaces
like Reader, Writer etc
17:41 < ibiwan> type snode interface { Next() *snode; }
17:42 < sxs> semicolon?
17:42 < ibiwan> still trying to figure out when I need those, too :)
17:43 < sxs> i thought almost never
17:43 < ibiwan> cool
17:43 < ibiwan> so my sticking point is...  how do I make a function that
both requires an snode as input and promises one as output...  then use a less
specific "node" type for both?
17:43 < KBme> yeah, the for clauses are one exception
17:43 < ibiwan> it seems to work for the parameter, just not the return
17:44 < ibiwan> I think when I originally wrote this file I was under the
impression all lines within a block except the last one had to have semicolons...
then I never went back and corrected the file later
17:45 < Tv> ibiwan: func foo(in snode) snode {return in.Next()} // should
just work
17:45 < ibiwan> k
17:45 < ibiwan> brb :)
17:46 < Tv> oh and you probably don't mean *snode in the interface above
17:46 < ibiwan> ok
17:46 < Tv> usually what you do with structs like that is, you make a
pointer to the struct fulfill the interface
17:47 < ibiwan> the examples I was reading seem to be pretty inconsistent in
their use of pointers....  or rather, I can't tell when they use them and when
they just assume a reference type
17:47 < Tv> ^ that was the key insight for me
17:47 < ibiwan> hmmm, ok
17:47 < ibiwan> lemme see what I can do with that
17:48 < Tv> so func (n *LinkedListNode) Next() {return n.next} or something
like that
17:48 < Tv> type LinkedListNode struct {value interface{}, next
*LinkedListNode}
17:49 < ibiwan> aha!  what's that?  I saw it in one place, but not
explained...  "value interface{}"
17:53 < ibiwan> oh, empty interface...  the generic type
17:53 < Tv> it's like C's void*
17:53 < Tv> except typesafe
17:54 < ibiwan> so when I eventually want my nodes to store something, I can
add that field
17:54 < ibiwan> for now I was just trying to get the connections to work in
the first place :)
17:57 -!- sxs [~sxs@e180001209.adsl.alicedsl.de] has quit [Quit: sxs]
17:57 < ibiwan> so the reason that's not "just working" for me...  I have
multiple things; node (struct), pnode, dnode, tnode (interfaces)
17:57 < ibiwan> I'm trying to define node in such a way as to satisfy
multiple interfaces
17:58 -!- mssm [~mssm@ip-95-221-64-37.bb.netbynet.ru] has quit [Ping timeout: 245
seconds]
17:58 < ibiwan> pasting...
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18:10 < ibiwan> sorry, got lost in trying to clean it up for public
consumption
18:14 < ibiwan> http://www.copypastecode.com/51310/
18:15 < ibiwan> I'm still trying to figure out how to apply your "pointers
fulfill interfaces", as you can tell
18:16 < Tv> ibiwan: maybe you're chasing that goal for no good reason?
18:16 < Tv> your operation seem really tied to the data structure
18:16 < Tv> interfaces are only useful when there's more than one way of
doing it
18:17 < KBme> like reading, you can read from a file, from a stream, from a
compressed file/stream, from an encrypted file/stream
18:17 < ibiwan> well there's no problem I'm trying to solve here...  except
possibly "not understanding go" :)
18:18 < ibiwan> do yo think what I'm trying to do is not possible?
18:18 < Tv> not sure what you want to do
18:18 < ibiwan> use one node type in several roles for different data
structures
18:19 < ibiwan> "more than one way of doing it" here could be "arranging
nodes for efficient access"
18:20 < Tv> sure but if you e.g.  and ordered tree, you can't .insert()
arbitrary things into just any of the node
18:20 < Tv> s
18:20 < Tv> so it seems like your "i implement this interface" thinking
belongs on the top level of the data structure
18:20 < Tv> .insert() etc
18:21 < Tv> oh wow that's garbled..  i may not have woken up yet ;)
18:22 < ibiwan> heh
18:22 < ibiwan> I wasn't gonna say anything...  assumed ESL :P
18:24 < ibiwan> so assuming my overall goal is stupid, I'd still like to see
it through :)
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18:25 < Tv> ibiwan: well, are tree nodes really gonna look like linked list
nodes?
18:25 < Tv> ibiwan: what are the shared operations?
18:25 < Tv> ibiwan: single/doubly linked lists you can do easily
18:25 < ibiwan> at the moment, I'm getting an error that this: type snode
interface { Next() snode; SetNext(snode) } is not implemented by this: func (n
*node) Next() *node { return n.rt; }
18:25 < ibiwan> "(wrong type for Next method)"
18:26 < ibiwan> the nodes?  have left, right, up pointers to other nodes
18:26 < ibiwan> SLL just uses right, DLL uses right and left, TREE uses all
three
18:26 < Tv> your SetNext takes nodes instead of snodes
18:28 < Tv> your Next returns *node instead of snode
18:28 < Tv> you really need to make those match
18:30 < Tv> go doesn't implicitly cast for you
18:30 < ibiwan> processing...
18:32 < ibiwan> I guess I'm having a hard time seeing when I'm "fulfilling
an interface" vs when I'm "type casting"
18:33 < Tv> var foo interface something; var bar MyStruct;
18:33 < Tv> two completely different types
18:33 < Tv> stop thinking java ;)
18:33 < ibiwan> never used java
18:33 < ibiwan> insert takes a parameter of type snode
18:34 < ibiwan> I call it with the address of a node
18:34 < Tv> if your interface says Next() snode, then the Next receivers
that try to fulfill that interface really need to say func (...) Next() snode
18:34 < ibiwan> why is the implicit translation from *node to snode not a
cast?
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18:45 < glsubri> hello: what should i write for the type "a" with this (i
want "a" as an array): func code (a ???, dec int) {...
18:46 < ibiwan> what do you want an array of?  and do you know about slices?
18:46 < Tv> glsubri: sounds like you want a slice..  foo []bar
18:46 < ibiwan> Tv: here's my working stuff (still pointless, still don't
get the aforementioned distinction) http://www.copypastecode.com/51317/
18:47 < glsubri> i don't know about slices...
18:48 < ibiwan> http://golang.org/doc/effective_go.html#slices
18:48 < ibiwan> http://golang.org/doc/go_for_cpp_programmers.html#Slices
18:48 < glsubri> ibiwan: i don't know C++ nor C...
18:49 < ibiwan> the first link should be good, then :)
18:50 * ibiwan wanders off for a while
18:51 < glsubri> i don't understand what do they "do" ? Why do we use slices
?
18:53 < glsubri> http://pastebin.com/pkrz21XY
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19:39 < sxs> is it not possable to pass nil to a constructor function: t :=
NewTre(nil)
19:40 < sxs> is it the objective-c way like with multiple initializers:
NewTree() and NewTreeWithStruct(s MyStruct)?
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19:47 < laurent__> help
19:51 -!- Surma [~surma@91-64-183-10-dynip.superkabel.de] has joined #go-nuts
19:52 < Surma> Hey guys.  Anyone ever had prof fail with "could not attach
to child process: mach: failure" (darwin 386)
19:55 < Surma> Nevermind, figured it out.  It's missing sudo right, even
though I ran sudo.bash
19:55 < Surma> I'll take a look into it and maybe file an issue
20:00 < al-maisan> Hello there, I am trying to build the gotags tool
(http://bitbucket.org/sigpipe/gotags) but am getting compile errors
(http://pastebin.ubuntu.com/531919/) ..  did anybody manage to get this compiled?
20:00 < al-maisan> ..  or is the a better way to generate exuberant-ctags
like tags?
20:00 < al-maisan> there even
20:02 < laurent__> Hi all, I use freetype-go it works well but I try to
stroke a simple polyline with path, lines are not joined very well
20:02 -!- sacho [~sacho@83.228.17.51] has joined #go-nuts
20:03 < laurent__> ...  I use path.Start(p1); path.Add1(p2); path.Add1(p3)
then rasteriser.AddStroke :-(
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20:09 < al-maisan> hmm ..  any idea what the 'mode' parameter to
http://golang.org/pkg/go/parser/#ParseFile should be set to?
20:09 < al-maisan> "The mode parameter controls the amount of source text
parsed and other optional parser functionality."
20:09 < al-maisan> ???
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20:17 < al-maisan> fwiw, the following changes fix the gotags tool:
http://pastebin.ubuntu.com/531932/
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20:28 < MaksimBurnin> This is offtopic but does anyone know a good GUI for
GDB with ability to trace a binary without debug symbols and sources (disassamble
it)
20:29 < MaksimBurnin> i tryed some, but they reqiring debug symbols
20:31 < MaksimBurnin> and i hate console version of gdb for this purpose.  i
like OllyDBG and IDA more, but they for windows...
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20:33 < Tv> MaksimBurnin: maybe try ddd, it's built on top of gdb but has a
decent ui
20:33 < Tv> it's been years since i used it, though
20:33 < MaksimBurnin> Thanks, ill try it)
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20:45 < MaksimBurnin> Tv: ive put a break at entrypoint, then clicked 'run',
gdb worked well, but i got "A syntax error in expression, near
0x...................." in a Machine code window
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21:05 * MaksimBurnin LOL at KDB's not todo list "A graphical display like DDD
has."
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21:27 < brebre31> hi
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21:28 * ibiwan wanders back
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21:28 < brebre31> it bored
21:29 < ibiwan> Tv, any further commentary on my type confusion?
21:30 < brebre31> lol ok
21:33 < brebre31> bye room
21:34 < brebre31> go nuts
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21:44 * MaksimBurnin founds out there is no way to trace a linux binay without
symbols, using GUI, and starts to write over 9000 aliases for gdb
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23:15 < brebre31> hi
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23:33 < fenicks> hello
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23:55 < KBme> is it possible to define values a type can have, or one has to
check that in runtime?
--- Log closed Mon Nov 15 00:00:15 2010