golang-nuts@googlegroups.com discussions for January 2013

84	[go-nuts] literal maps with duplicate keys

is the result of this program well-defined? http://play.golang.org/p/vz7LEIJSFR --

Roger peppe
Jan 24, 2013 at 5:28 pm
Jan 29, 2013 at 8:49 am

82	[go-nuts] Alternative syntax for slice type

Just a thought. I'm thinking that maybe [*]type instead of []type would be more intuitive as to how slices are references to arrays, having flexible length. The syntax would be an alternative, not a ...

Itmitica
Jan 7, 2013 at 7:49 pm
Jan 9, 2013 at 2:22 pm

76	[go-nuts] Go channel race condition safety

- "Effective Go" says "Do not communicate by sharing memory; instead, share memory by communicating." Then look at the first example: go func() { list.Sort() c <- 1 }() "list" is shared between two ...

John Nagle
Jan 18, 2013 at 6:25 pm
Jan 22, 2013 at 5:44 pm

71	[go-nuts] Does go need an end keyword like matlab?

In slice/string manipulation, it's very common that you need to access the length of the slice/string. end is defined as this: s[:end] == s s[:end-1] = remove the last element s[end-1] = the last ...

David DENG
Jan 29, 2013 at 10:49 am
Jan 31, 2013 at 6:18 am

66	[go-nuts] Passing struct by value

Hi folks, My background is mainly in high level scripting languages like PHP, Perl, Bash, and whatnot, though I've had exposure to C, C++, and Assembly. I'm learning go because I love the way it ...

Zachary Brown
Jan 30, 2013 at 3:53 pm
Feb 6, 2013 at 8:55 pm

59	[go-nuts] Range over lines in a file

I would really love if we could range over the lines of a file, something like: if f, err := os.Open("file.txt"); err == nil { for i, line := range f { fmt.Print(line) } } Should I be ashamed for ...

Rif
Jan 22, 2013 at 10:33 am
Jan 25, 2013 at 11:06 pm

56	[go-nuts] Overhead of interfaces with sort.Sort()

Hi, I'm doing some big sort operations to build an inverted index and am finding the generated pointer receiver code for using interfaces with sort.Sort() is itself a big performance drain. Maybe I'm ...

Donovan Hide
Jan 13, 2013 at 12:43 pm
Jan 25, 2013 at 1:06 am

50	[go-nuts] Nasty bug caused by ":="

I found a bug in my code, caused by ":=", which was very hard to find. This is simplified example: http://play.golang.org/p/nxthpeYv3p In my real code Iter was a slice and Pop removes one element ...

Ziutek
Jan 21, 2013 at 12:37 pm
Jan 23, 2013 at 8:19 am

49	[go-nuts] gccgo + c++ library as a Golang package

Calling c++ library from Golang is possible using gccgo. I made it work by compiling the c++ library source code code as a *static* library and linked it with gccgo using swig as an intermediate tool ...

Constantine Vasil
Jan 28, 2013 at 11:54 pm
Jan 31, 2013 at 6:01 pm

48	[go-nuts] Should we be responding to "Go: a nice language with an annoying personality"

I would agree they have a fair point, when you are starting with the language it would be easier to learn if you did not have to keep commenting import statements out just to get code to be fully ...

Pfitzsimons
Jan 18, 2013 at 8:24 am
Feb 28, 2013 at 11:02 am

48	[go-nuts] What Linux distribution is recommended for Golang web server?

I am using Go as a web server. Tested for a month under Windows Server 2008 Virtual Machine but it runs for a day and then stops with a message: "The specified network name is no longer available" ...

Thstart
Jan 3, 2013 at 4:19 pm
Jan 4, 2013 at 4:08 am

46	[go-nuts] RFC: Reserve package name "app" for applications

I find myself needing a "compact" and "generic" package root name for application-specific packages. The objective is to keep my app code "consistent" and "portable" between "workspaces" while ...

Vincent Callanan
Jan 24, 2013 at 11:45 am
Oct 7, 2014 at 11:00 am

46	[go-nuts] Proposal for a new statement

An assigment statement that remove the reference in the source. For example, the operator is <=(and :<=), then the following statement: x <= y equals x, y = y, <nil where <nil is the zero value for ...

David DENG
Jan 9, 2013 at 2:42 pm
Jan 11, 2013 at 3:50 pm

44	[go-nuts] Concurrent map - newbie question

Hi everyone, first, sorry for the newbie question, but despite searching on the web I am not sure I fully understand how to best implement what we need. We basically have a close-to-realtime app (SLA ...

Jacek99
Jan 10, 2013 at 1:17 am
Jan 11, 2013 at 12:39 pm

38	[go-nuts] "big size file" for Go

Is it safe to assume: - small size: <100KB - medium size: <1MB - big size: <10MB - huge size: 10MB ? Thanks, Mitică --

Itmitica
Jan 26, 2013 at 10:14 am
Jan 31, 2013 at 5:33 pm

37	[go-nuts] [feature request] add path/filepath.JoinList(elem ...string) string

path/filepath has both Split and Join for paths, but lacks a JoinList counterpart for lists. This function would immediately be useful inside the dashboard builder, and for anyone manipulating PATH ...

Dave Cheney
Jan 7, 2013 at 5:31 am
Oct 14, 2013 at 12:18 pm

37	[go-nuts] parallel mergesort

I decided to implement a parallel sort in Go inspired by cilksort [http://supertech.csail.mit.edu/cilk/]. It's a parallel mergesort where not only do we sort in parallel, but the merging is done in ...

Dan Adkins
Jan 25, 2013 at 4:18 am
Jan 25, 2013 at 7:58 pm

36	[go-nuts] A tiny VM in Go, and how it compares to C

I've implemented GenTiradentes' TinyVM ( https://github.com/GenTiradentes/tinyvm) in pure Go, to learn about internals of VMs and see how Go could stand up to C in this case. This is an x86-inspired ...

Martin Angers
Jan 13, 2013 at 3:22 pm
Jan 19, 2013 at 1:02 am

35	[go-nuts] Does Go have objects?

Some programming languages (C, C++, Python, etc...) are defined based on the "object" concept, which essentially refers to a region of memory storage. Yet, Go supports zero-size variables[1], and in ...

Rui Maciel
Jan 9, 2013 at 11:12 am
Jan 15, 2013 at 4:26 pm

35	[go-nuts] How to test whether an interface contains a nil value (but with type)

For excample in the following program: http://play.golang.org/p/9fdGTbeVdb in func foo, I'd like to call i.Func when it is not nil. I know why this failed, but how to write a correct one? Why go-lang ...

David DENG
Jan 7, 2013 at 8:04 am
Jan 8, 2013 at 3:41 am

34	[go-nuts] [RFC] Debian packaging of Go libraries and programs

Dear Go community, I spent some time trying to figure out how to best package Go libraries and programs in Debian. You can read the discussion on the debian-devel mailinglist at ...

Michael Stapelberg
Jan 2, 2013 at 11:02 pm
Jan 7, 2013 at 5:38 pm

31	[go-nuts] Slow performance with multiple http.Get (get status code for top 1 million sites by Alexa.com) in Windows 7.

Very slow perfomance with multiple http.Get (Windows 7). Some urls is not exists and it looks like something blocking. Please, help. package main import ( "fmt" "io/ioutil" "net/http" "runtime" ...

Htdesign
Jan 18, 2013 at 3:16 am
Jun 30, 2014 at 12:10 pm

30	[go-nuts] proposal past Go 1.1 - IfStmt = "if" [ Expression \| SimpleStmt ";" ] ....

The Simplestatement in an if is certainly handy. But I would even more like to be able to write sthg. between the lines of if checklinks && ok, err := CheckLink(link); !ok { // handleHere } This ...

Johann Höchtl
Jan 8, 2013 at 4:33 pm
Jan 10, 2013 at 8:53 pm

29	[go-nuts] Go Object Oriented Design

We've seen a fair amount written about concurrency in Go, but I really wanted to spend some time digging into Go's object model. This article is a result, and covers embedding, interfaces and ...

Nathan Youngman
Jan 15, 2013 at 4:36 am
Jan 17, 2013 at 6:52 pm

29	[go-nuts] Initial impressions of Go... and semicolon insertion

Hi all, I spent some time learning Go over the holidays and for the most part I really like the language. So far I've run into a few issues, but I'll probably manage to work through them. One thing ...

Robert Tweed
Jan 11, 2013 at 4:00 am
Jan 15, 2013 at 1:44 am

28	[go-nuts] any Windows 8 Go users?

As discussed recently, Dave Cheney is preparing a CL regarding the minimum system requirement for Go. (The relevant discussion is here: https://codereview.appspot.com/7225047/) As none of the people ...

Minux
Jan 26, 2013 at 10:03 pm
Feb 7, 2013 at 7:25 am

27	[go-nuts] Recommended SQLite wrapper?

Hi all -- a quick visual scan of http://godashboard.appspot.com/ finds five SQLite wrapper libraries. It *appears* that https://github.com/mattn/go-sqlite3 is up-to-date; the others, not so much ...

Greg Ward
Jan 15, 2013 at 8:44 pm
Jun 28, 2013 at 6:28 am

26	[go-nuts] I know floating-point precision is a beast, but... isn't there any sane way to get at, say, the 0.3 part of 4.3?

Here's the problem most easily explained: http://play.golang.org/p/PNbcWeTxrx I know I can just stringify the float and parse before and after the "." but... yeah wondering if there's some sort of ...

Philipp Schumann
Jan 24, 2013 at 9:13 am
Jan 25, 2013 at 7:03 pm

26	[go-nuts] High futex contention when reading from DB with mgo

Hi, I have this very simple piece of code which is similar to a hot path in our application. GOMAXPROCS is left at the default of 1. http://play.golang.org/p/mCUK_9YMbj When I tested (siege, ...

Chandra Sekar S
Jan 4, 2013 at 7:48 pm
Jan 5, 2013 at 4:32 pm

23	[go-nuts] Possible new builtin: destroy

Before implementing this I'd like to ask if people would find it useful. In some security-sensitive environments it's useful to be able to wipe memory (such as removing a key). In my situation I ...

John Graham-Cumming
Jan 18, 2013 at 10:30 am
Feb 15, 2013 at 9:25 pm

23	[go-nuts] Concurrency: channel vs mutex

So, I've got this struct which contains a map and which is accessed from many goroutines. It's also go a bunch of channels and a select on those channels. So, if you want something done with this ...

Pkulak
Jan 28, 2013 at 5:05 am
Feb 3, 2013 at 1:37 pm

23	[go-nuts] reverse Geocode

1) from my device I can get latitude/longitude 2) a DB table with latitude/longitude/POI I want to find the closest match of 1) with 2) in order to get POI This is basically reverse a Geocode. How is ...

Thstart
Jan 18, 2013 at 7:28 pm
Jan 21, 2013 at 6:10 pm

23	[go-nuts] A Go Puzzler: time.IsZero, the year zero and negative times.

I ran into some confusing behavior today when trying to add time.Time values together: time.Time{} has the year 0001, but t, := time.Parse("15:04", "15:00") has the year 0000. This is how it's ...

Decitrig
Jan 13, 2013 at 4:19 am
Jan 18, 2013 at 9:02 pm

23	[go-nuts] os.CreateNew ?

There appears to be no stdlib method for creating a file and returning an error if it already exists... this is a pretty common thing to do, so you don't accidentally clobber files that already ...

Nate Finch
Jan 12, 2013 at 1:34 pm
Jan 14, 2013 at 11:02 pm

23	Re: [go-nuts] java vs Go performances

Please don't do that. With all due respect these cliched answers don't help. Someone asks a question and the first few posts are "you shouldn't do that because ...." and then all the cliched reasons ...

Don Dailey
Jan 4, 2013 at 2:40 pm
Jan 6, 2013 at 5:35 pm

22	[go-nuts] quick and dirty "matrix": is this an absolutely ugly idea?

When I just want 2D tables and don't need any linear algebra, or other matrix-related stuff this http://play.golang.org/p/NLdHOyz35z allows me to use addressing like mtx[i][j] = x instead of ...

Peter A. Cejchan
Jan 29, 2013 at 8:30 am
Jan 31, 2013 at 7:59 pm

21	[go-nuts] *a use and asm - good place to learn?

Hello, I'm interested in learning a little about asm and the Plan9 assembler and linker. I've read the manuals, but that reasonable expect a greater level of knowledge than I have (the last time I ...

Dan Kortschak
Jan 24, 2013 at 12:07 am
Jan 24, 2013 at 8:34 pm

20	[go-nuts] Char and char substitute

Around to 2 days ago I was trying to make a character randomize. But I couldn't get char variable, so this led to an 5 hours search for something this I'm was sure it existed. 4 hours later I ...

Bardiajedi
Jan 24, 2013 at 3:54 pm
Feb 4, 2013 at 3:04 pm

20	[go-nuts] nil map and delete

Here is a nice feature that some of you might have missed. Without having to check for nil, you can delay the creation of a map until you actually need to add your first element. Take a look at this ...

Stefan Nilsson
Jan 1, 2013 at 5:01 pm
Jan 7, 2013 at 1:06 am

19	[go-nuts] HTML5 parser that works?

Is there an HTML5 parser for Go that works? Tried "code.google.com/p/go-html-transform/h5" The parser dereferences nil on some documents, from bogusCommentHandler. Issue filed ...

John Nagle
Jan 16, 2013 at 8:47 pm
May 1, 2013 at 6:21 pm

19	[go-nuts] Request for clarification: ARMv5 Support in Go 1.x

Hi, With reference to the previous discussions of SSE2 vs 387 support in Go 1.1, is the intention that ARMv5 continue to be supported for the life of the Go 1.x series ? Cheers Dave --

Dave Cheney
Jan 24, 2013 at 1:47 am
Feb 9, 2013 at 1:32 am

19	[go-nuts] Security downsides of static linking

In discussions with a sysadmin at $WORK, he mentioned that Go's static-linking is a deal-breaker for him. His example is if a security problem with a shared library (say, openssl) is discovered, only ...

Damian Gryski
Jan 30, 2013 at 10:39 am
Jan 30, 2013 at 5:51 pm

19	[go-nuts] Just a tiny success story about super simple parallelization

Hi fellow Gophers, just wanted to share how easy I got some of my image transformation code parallized with the help of Goroutines. The code is still far from optimal and it's just a fun project I ...

Niklas Schnelle
Jan 21, 2013 at 8:11 pm
Jan 25, 2013 at 4:11 am

19	[go-nuts] gofmt produces both "}{" and } {¨

Compare line 6 and line 8 in this code (http://play.golang.org/p/87_nThcN-R): package main func main() { for _, x := range []struct { in, out int }{ {1, 1}, } { if x.in != x.out { // problems... } } ...

Stefan Nilsson
Jan 16, 2013 at 12:54 pm
Jan 17, 2013 at 9:42 am

19	[go-nuts] Assembly version of strings.Index

Hello. I've written an optimized version of the strings.Index function for amd64 in Assembly. Before sending it in I would like to know if an Assembly version has to be written for 386 and arm as ...

Daniel Liden
Jan 13, 2013 at 9:31 pm
Jan 15, 2013 at 3:49 pm

18	Re: [go-nuts] Why does this function not inline ?

Hi everyone, it's been over a year: just curious, is the inliner *still* "still primitive" or has it progressed since this thread was created? -- You received this message because you are subscribed ...

Philipp Schumann
Jan 31, 2013 at 6:00 am
Jan 29, 2014 at 7:52 pm

18	[go-nuts] Where to host presentation about Go made with present?

Hello, Last month I gave a talk "Let's Go, or introduction into Go" at RailsClub’Ulyanovsk (other themes covered on this conference for (ex-)Rubists/Railsists: Erlang, functional programming and ...

Alexey Palazhchenko
Jan 7, 2013 at 12:13 pm
Feb 21, 2013 at 11:21 pm

18	[go-nuts] Regex without lookahead/lookback

Hi, I've got this slightly painful regex: ^(:?(\\d+(-(\\d+))?))+$ which should match according to the following examples: {"", true}, {"1", true}, {"1:3", true}, {"1-2:3", true}, {"1-2:3-2", true}, ...

Donovan Hide
Jan 28, 2013 at 5:37 pm
Jan 31, 2013 at 8:19 pm

18	[go-nuts] Can i do strings multiply like python?

I was wander if "A" * 5 ("AAAAA") is possible in go, any other ways to do like python's? --

Tony Shao
Jan 7, 2013 at 6:33 pm
Jan 19, 2013 at 1:09 am

18	[go-nuts] go does not work with for

Hi, I have a trouble with this code: package main import "fmt" func print(i int, valor string) { fmt.Printf("position: %d element: %s \n", i, valor) } func main() { urls := []string{"1", "2", "3", ...

Xan
Jan 6, 2013 at 7:43 pm
Jan 9, 2013 at 6:44 pm

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