golang-nuts@googlegroups.com discussions for March 2015

34	[go-nuts] clarification on io.Reader EOF semantics

I would like some clarification on io.Reader semantics wrt EOF. I have an io.Reader implementation that will return a io.EOF in some cases where the []byte parameter is zero length. It's not clear to ...

Dan Kortschak
Mar 17, 2015 at 1:16 am
Mar 17, 2015 at 10:29 pm

25	[go-nuts] starting of porting go core to gccgo

Howdy, To learn go, I have started to port the go core to compile on top of gccgo without using an existing go implementation. Some progress is being made. The goal in the end is to be able to ...

James Michael Dupont
Mar 1, 2015 at 10:17 am
Mar 14, 2015 at 1:25 am

23	[go-nuts] Proposal: go get project.lst

Hello all! What is the group opinion on adding functionality to `go get` so that it reads project requirements from a file (very much akin to how python-pip does with their requirements.txt)? Is this ...

Juan Sanchez
Mar 24, 2015 at 5:47 pm
Mar 28, 2015 at 7:26 pm

23	[go-nuts] 0 length slices and arrays in golang

Was trying to figure out how 0 length arrays and slices behaved in Golang. Came up with two snippets of code (I found the code somewhere and modified it a bit to work with this) ...

Anmol Sethi
Mar 23, 2015 at 5:24 pm
Mar 24, 2015 at 8:20 am

20	[go-nuts] What does your Go development environment look like?

I was just wondering what sorts of programs people used to create their go programs. Do you use vim? Sublime Text? ed? Any specific plugins? Feel free to post screenshots if it looks interesting ...

John Klika
Mar 26, 2015 at 8:30 pm
Apr 4, 2015 at 9:48 pm

20	[go-nuts] Bug with 'time.Sleep()' in go or in wine?

Hi all, When I compile this simple program and run it under wine (1.7, ubuntu 14.04) it hangs indefinitely: package main import ( "fmt" "time" ) func main() { fmt.Println("before") ...

Leonbogaert
Mar 22, 2015 at 11:00 pm
Mar 26, 2015 at 9:51 pm

20	[go-nuts] Funky evaluation order of function arguments

Hello nuts! In http://play.golang.org/p/OuvJp26sSv I noticed something strange. The specs say "At package level, initialization dependencies <https://golang.org/ref/spec#Package_initialization ...

Martin Bruse
Mar 25, 2015 at 7:00 am
Mar 26, 2015 at 9:59 am

19	[go-nuts] Trivial Question about Go

Hello community! This may be a trivial question but I actually want to know your opinion about this. We're three experienced developers starting to work on a new project. The aim is to build a ...

Rbarreiro
Mar 30, 2015 at 4:16 pm
Mar 31, 2015 at 5:46 pm

19	[go-nuts] STATUS_ACCESS_VIOLATION for map[string]interface{}

Hey, I try to write a YQL function, and my env is golang 1.4.2 and windows 2012r2. func YQLhtml(link, xpath string) (map[string]interface{}, error) { ... err = json.Unmarshal(raw, yr) ... return ...

Jianyang Zhao
Mar 17, 2015 at 8:22 am
Mar 19, 2015 at 4:33 am

19	[go-nuts] Updating a struct in a map

Is it possible, using go's reflection, to traverse a map that has a struct as its value and then update a value in there? If you look at this example: http://play.golang.org/p/RRoJMCflZl you can see ...

Duglin
Mar 12, 2015 at 11:33 pm
Mar 13, 2015 at 11:51 pm

18	[go-nuts] Method Overloading Question (deeper into the compiler and the Go way)

I know you guys are cringing at the title. I've read a bunch of posts on Go and function overloading, so before I ask the question, please let me say: 1) I love Go and have used if for several year ...

Warren Bare
Mar 11, 2015 at 6:35 pm
Mar 12, 2015 at 4:49 pm

16	[go-nuts] Rough patch breaks equality's transitivity

I'm talking about non-nil interfaces containing nil-values not being nil according to equality. http://play.golang.org/p/Uyw5u1Udc5 (I undestand the cause of this; not what I'm asking) It would seem ...

Thwd
Mar 19, 2015 at 11:08 am
Mar 20, 2015 at 2:31 pm

16	[go-nuts] Can I make a switch on a calculation

Hello, I have to make the Fizzbuzz challenge. Now I wonder if I can do something like this switch number { case number % 3 == 0 : fmt.Printf('buzz') case number % 5 == 0 : fmt .Printf('fizz) case ...

Roelof Wobben
Mar 3, 2015 at 7:32 pm
Mar 4, 2015 at 3:21 pm

15	[go-nuts] Italian translation of tour.golang.org.

Hi, I just completed the translation of the Go Tour in Italian and I have deployed it at this url: http://go-tour-ita.appspot.com/ . Unfortunately, the app-id "go-tour-*it*" is not available, so I ...

Alessandro Baffa
Mar 6, 2015 at 12:02 am
Mar 9, 2015 at 3:56 am

14	[go-nuts] reflect deprecation TODOs: plans?

I was looking at the reflect.Value source yesterday and noticed two TODOs to deprecate methods to get backing value addresses. http://golang.org/src/reflect/value.go?s=36337:36355#L1185 ...

Dan Kortschak
Mar 24, 2015 at 11:01 pm
Mar 25, 2015 at 10:00 pm

14	[go-nuts] "+=" for closure variables isn't atomic?

It seems that when trying to use a '+=' to increment a variable in a closure, '+=' isn't atomic. I don't see why it shouldn't be. A snippet: ========================== var waitGroup sync.WaitGroup ...

Jeffrey 'jf' Lim
Mar 17, 2015 at 9:10 am
Mar 17, 2015 at 4:17 pm

14	[go-nuts] request reflection and closure supports on gccgo 5.0.0 on MIPS

I struggled compile gcc 5.0.0 and hope gccgo will support refection API on a MIPS CPU. finally the compilation is success and i got gccgo 5.0.0 working. but, the reflection and closure is not working ...

Yongfeng liu
Mar 11, 2015 at 6:55 am
Mar 13, 2015 at 2:56 am

13	[go-nuts] Client certificate not sent to server

Hello! I am trying to access an API served by nginx (with a self-signed SSL cert) that requires client certificate authentication, and while I can successfully auth with curl, I unable to accomplish ...

Dots Connected
Mar 17, 2015 at 5:19 pm
Apr 1, 2015 at 10:18 pm

13	[go-nuts] object is [windows amd64 go1.4.2] expected [windows amd64 go1.4.2 X:precisestack] error

Hello gophers, I'm trying to build a go program which is linked to a C module. This is the standard procedure from SWIG 3.0 documentation but I am getting following error message near the final ...

PARK, Kyung-Kook
Mar 30, 2015 at 8:26 am
Mar 31, 2015 at 2:45 am

13	[go-nuts] strings and numbers, suggested language improvement

Hi Gophers, I have a suggestion to make: Consider the following: package main import "fmt" import "strconv" func main() { var mynumber float64 = 3.00 var mystring string ="The amount is " ...

Will
Mar 26, 2015 at 12:40 pm
Mar 26, 2015 at 8:20 pm

13	[go-nuts] reflection detection of subclass fields

Hi, I have a base type/interface with a func() that, via reflection, will detect its fields. However, when I subclass it and extend it with new fields that same func() will never detect the new ...

Duglin
Mar 15, 2015 at 1:43 am
Mar 15, 2015 at 11:02 pm

13	[go-nuts] The Go Programming Language!

Thanks to Dave for posting this link to hackernews: http://www.amazon.com/Programming-Language-Addison-Wesley-Professional-Computing/dp/0134190440/ Enjoy, Raj -- You received this message because you ...

Rajanikanth Jammalamadaka
Mar 5, 2015 at 1:17 pm
Mar 6, 2015 at 1:33 am

12	[go-nuts] Under what circumstances does GC trigger?

Hi all, I'm running on tip, but this behaviour happens on 1.4.2 as well. I have a long-running server program, and it makes (and then destroys) a lot of objects and then settles down. While I'm ...

Peter Vessenes
Mar 20, 2015 at 7:32 pm
Mar 24, 2015 at 5:56 pm

12	[go-nuts] CGO: How to have a go callback exported and be used by in several packages through CGO?

Is there a way to be able to use an go callback by CGO from multiple packages? I have one main app, that imports several packages, each of those packages may need to interface with C, and of C call a ...

Oblita
Mar 15, 2015 at 1:31 am
Mar 22, 2015 at 8:03 pm

12	[go-nuts] go and make

what is the general stance of go with respect to make? while some might argue that the build and install tools might be smarter, i would be happy enough with an equivalent of gcc's "-M" flag, which ...

Andrew
Mar 10, 2015 at 10:54 pm
Mar 17, 2015 at 5:08 pm

12	[go-nuts] Modifying net/http server.go, using decrypted TLS certificates from memory

As far as I know there is no way to pass the []byte of a certificate and private key to ListenAndServeTLS so that plaintext cert/key is not stored on hard disk. Could someone verify this is the case ...

Alex Howard
Mar 12, 2015 at 10:59 am
Mar 13, 2015 at 11:15 am

11	[go-nuts] strange behavior of Http Redirect

I have written a web application in golang which basically extracts the url query parameters, checks if the response is cached in redis for that particular request and returns a Json response ...

Maco Anshu
Mar 31, 2015 at 11:29 pm
Apr 1, 2015 at 6:25 am

11	[go-nuts] A Golang command line dashboard

TL;DR: termui <https://github.com/gizak/termui Hi guys! I was wondering why seems like we don't have a dashboard-like command line ui, so I made some commits and just released a Go command line ...

Gizak
Mar 10, 2015 at 9:11 pm
Mar 25, 2015 at 10:14 pm

11	[go-nuts] json Marshaling of ">" produces unicode

package main import( "encoding/json" "fmt" ) type Test struct { Data string } func main() { res, := json.Marshal(Test{" "}) fmt.Println(string(res[:])) } Produces: {"Data":"\u003e"} However, I'd like ...

Yutong Zhao
Mar 9, 2015 at 3:30 pm
Mar 19, 2015 at 8:09 pm

11	[go-nuts] Experimental UI library from Google?

Hello, I found this library on reddit: https://github.com/google/gxui/. It's in the Google Github org, and it's license lists the copyright belonging to "The Go Authors". I wasn't able to find much ...

Craig Weber
Mar 17, 2015 at 3:46 pm
Mar 18, 2015 at 12:31 pm

11	[go-nuts] I think this intialization loop is a false complain

The code is here: http://play.golang.org/p/EpFBGEDP2K func b(n int) int { if n == 0 { return n } return n + a(n - 1) } var a = func(n int) int { return b(n) } I had thought the above code should ...

David DENG
Mar 17, 2015 at 9:45 am
Mar 17, 2015 at 7:31 pm

11	[go-nuts] function to call at run-time, rather than at compiler time.

Dear Team, Good Day. I want to know is it possible achieve it in GO . I have functions Test1 , Test2 , Test3 .... in a package DEMO. I would like to trigger those functions at run time like below ...

Duggineni hari babu
Mar 13, 2015 at 8:36 am
Mar 14, 2015 at 1:11 am

11	[go-nuts] Multiple lock for one routine, base on input parameter

Hi Gopers. I need some kind of lock, to lock a routine base on a variable (for example user id) for example I want to lock the update for user 1 data, to prevent over write, but at the same time, I ...

Forud A
Mar 10, 2015 at 11:58 am
Mar 10, 2015 at 4:54 pm

11	[go-nuts] Any golang code convertors?

Are there any good golang code convertors? I'd like to convert c# to golang, but if there isn't a convertor I'll first use another tool to get to java and then from there to golang. Thanks! -- You ...

AndreR
Mar 3, 2015 at 5:45 pm
Mar 7, 2015 at 3:06 pm

11	[go-nuts] gorpc: simple and fast rpc library for highload projects

Hi all, If you need simple and fast RPC library optimized for high load, then check it out - https://github.com/valyala/gorpc . The library allowed reducing network bandwidth from 300Mbit/s to ...

Aliaksandr Valialkin
Mar 1, 2015 at 2:49 am
Mar 4, 2015 at 9:33 pm

11	[go-nuts] Confusing whitespace handling in tags

A strange issue has just confused me and a fellow developer for some time. It appears that if 2 field tags are separated by a tab character, the second one is completely ignored. See, for example ...

Sam Salisbury
Mar 2, 2015 at 12:27 pm
Mar 2, 2015 at 11:35 pm

10	[go-nuts] [ANN] decimal: arbitrary-precision decimal arithmetic library

I work for an e-commerce company, and we, like many gophers before us, needed a decimal library for proper accounting. When dealing with money, rounding errors are undesirable. Unfortunately, ...

Vadim
Mar 5, 2015 at 7:57 pm
Mar 17, 2015 at 5:57 am

10	[go-nuts] DSP FIR Filter

Hi all, I am new to go, writing an application to serve EEG data over http. I am looking for some signal processing filters. Does such a package exist? If not, is anyone interested in working on such ...

Kjs
Mar 7, 2015 at 9:17 pm
Mar 14, 2015 at 5:54 pm

10	[go-nuts] Unexpected performance difference between blocking select and non-blocking select

Hi all, Today in https://github.com/valyala/gorpc/pull/1 I discovered that non-blocking select is faster than blocking select by more than 6 times: func makeChans(n int) (bCh chan struct{}, nbCh chan ...

Aliaksandr Valialkin
Mar 5, 2015 at 11:14 am
Mar 13, 2015 at 10:35 am

10	[go-nuts] branch prediction revisited

So, I’m revisiting a topic first asked about here: https://groups.google.com/forum/#!topic/golang-nuts/lOMvhVkGPXU <https://groups.google.com/forum/#!topic/golang-nuts/lOMvhVkGPXU I have an ...

Garrett D'Amore
Mar 2, 2015 at 7:27 pm
Mar 9, 2015 at 5:02 am

9	[go-nuts] Re: [golang-dev] proposalish: update the error interface

Let's move this discussion to golang-nuts. If the library author names all their errors like ErrSomeError, that is enough, right? result, err := lib.F() if err == lib.ErrSomeError { // ... } else ...

Caleb Spare
Mar 31, 2015 at 7:39 pm
Apr 1, 2015 at 11:46 pm

9	[go-nuts] Unexpected HTML template behavior

Hi, This baffles me: http://play.golang.org/p/1jfi2YLFum I know of no specification, HTML or XML, that requires lower-casing the first character of an tag. Why is html/template doing this? --- SER -- ...

Sean Russell
Mar 27, 2015 at 9:14 pm
Apr 1, 2015 at 12:39 pm

9	[go-nuts] new parent() build-in ("static closures")

In order to implement intrusive interfaces[1] I propose a new parent() built-in that returns the parent of a struct member. It can be statically checked and thus always work as long as the fallowing ...

Shawn Landden
Mar 26, 2015 at 1:33 am
Mar 28, 2015 at 2:27 am

9	[go-nuts] how do I extract and use common code

Hi, Newbie question here: I am new to Golang but have used Ruby and Java for quite some time. One thing I am struggling with that is simple to understand in other languages is how to I use my code ...

Corey Osman
Mar 26, 2015 at 9:26 pm
Mar 26, 2015 at 11:10 pm

9	[go-nuts] Address of slice

I have this piece of code package main import ( "fmt" ) func Extend(slice []int, element int) []int { n := len(slice) if n == cap(slice) { // Slice is full; must grow. // We double its size and add ...

Anmol Sethi
Mar 23, 2015 at 5:26 am
Mar 23, 2015 at 11:22 am

9	[go-nuts] syscall: dup2 blocks contrary to runtime's expectations for fuse file systems

Hi golang-nuts, I see that syscall.Dup2 uses Syscall instead of RawSyscall, which I understand to mean that the runtime assumes it cannot block. (Please correct me if I'm wrong.) If I understand ...

Aaron Jacobs
Mar 20, 2015 at 4:01 am
Mar 23, 2015 at 12:13 am

9	[go-nuts] CIDR from ip range

I'm looking for a Go lib, code snippet or an advice on "calculating" one or more CIDR from two ip addresses. Something that would work similar to the service provided here ...

Victor
Mar 16, 2015 at 2:01 am
Mar 22, 2015 at 4:48 am

9	[go-nuts] Proactively closing longpoll connections for clients that disappear from the network

I'm trying to figure out why persistent http connections show up in lsof as established for so long (approximately 90 minutes) after mobile clients have disappeared from the network abruptly. The way ...

Traun Leyden
Mar 18, 2015 at 9:21 pm
Mar 19, 2015 at 8:03 pm

9	[go-nuts] Best way of building websites for today and tomorrow?

I built a website using the GoRazor templating engine - https://github.com/sipin/gorazor. It works as fast as the Go code it compiles to, and worked fine, when it was small.. When larger, it gets a ...

Cinnabardk
Mar 14, 2015 at 1:40 pm
Mar 16, 2015 at 3:50 pm

9	[go-nuts] Database initialization and migrations

Hi everybody! I posted this yesterday in the mgo-users group, but since more people read here, I'll give it a try: I'm wondering, what do people use to init database data? I'm speaking of master ...

Daniel Blanco
Mar 12, 2015 at 3:10 pm
Mar 16, 2015 at 2:32 pm

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