Sorry, I accidentally sent the previous message before it was
complete. Please ignore that one.
On Tue, Aug 11, 2020 at 8:31 PM Ian Lance Taylor wrote:
> To me the point of your String example is: Go already has various ways
> of writing generic code. You can use interfaces, methods, and type
>
how can i see the code genrate by compiler, and where is the compiler code
to generate these code(which file, which function). i am just curious.
On Friday, August 14, 2020 at 1:32:25 PM UTC+8 Volker Dobler wrote:
> The value returned by reflect.TypeOf is not computed during
> compile time but d
On Tue, Aug 11, 2020 at 8:31 PM Ian Lance Taylor wrote:
> To me the point of your String example is: Go already has various ways
> of writing generic code. You can use interfaces, methods, and type
> assertions. You can use reflection. The generics design draft adds
> another way: parametric po
The value returned by reflect.TypeOf is not computed during
compile time but during run time. The code for package
reflect is generated by the compiler during compile time
but this is not interesting to understand reflection at all as
it is the same code generation like for lets say net/http.
The
Hello! I just ran into a problem that is solved really nicely with the new
generics proposal and I thought someone might find it interesting :D
I was trying to implement a library for doing ascii art programmatically.
The main struct is basically an image.Image except it works with bytes
instea
the return of reflect.TypeOf should be generate by compile, i am trying to
understand it, so i need to know where is code generate it in compiler. i
need to know compiler parts. and i am curious about what is do in user code
also. please tell me about it. i will be appriciated.
On Thursday, Au
0.00429 ns/op seems suspiciously low. I suspect that there could be a
problem with your benchmark. Could you post the code.
( On this mailing list please just send code as plain text or as a link to
the Go playground.)
On Thursday, August 13, 2020 at 9:18:52 PM UTC-4 Patrick wrote:
> I'm new
I'm new to go, and have being looking at escape analysis by benchmarking
some code that I created.
What I see is the escape analysis shows that certain variables escape to
the heap.
parameter path leaks to {heap} with derefs=2
But the result of the benchmark test shows 0 allocations.
100
Am I correct in thinking this has NOT been added to the go2go playground
yet?
When I try the example it fails: https://go2goplay.golang.org/p/TiMsP2K_3DS
Or am I making some stupid mistake?
On Wednesday, August 12, 2020 at 10:31:51 PM UTC-4 Ian Lance Taylor wrote:
> I just added a new section t
On Thu, Aug 13, 2020 at 7:35 PM, jimmy frasche
wrote:
> If I have
> func F[type E interface{}, S constraints.Slice[E]]() S
> are the following equivalent:
> F[int, []int]
> F[int]
> F[[]int]
> or are only 2 of the 3 permissible? Does that change if I swap the
> type parameters?
>From th
If I have
func F[type E interface{}, S constraints.Slice[E]]() S
are the following equivalent:
F[int, []int]
F[int]
F[[]int]
or are only 2 of the 3 permissible? Does that change if I swap the
type parameters?
On Thu, Aug 13, 2020 at 4:31 PM Michael Jones wrote:
>
> Yes, thank you. In inte
Yes, thank you. In intellectual shame I must say that I somehow understood
that the generics needed to be "leaf" functions. Thank you for
demonstrating my oversight. Happier now.
Michael
On Thu, Aug 13, 2020 at 3:47 PM Bakul Shah wrote:
> On Aug 13, 2020, at 3:29 PM, Michael Jones
> wrote:
> >
On Thu, Aug 13, 2020 at 6:30 PM Ian Lance Taylor wrote:
>
> If I understand you correctly, we changed that when we added the
> constraint type inference section. See the updated
>
> https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-type-parameters.md#type-inference
> secti
On Sunday, August 9, 2020 at 4:17:06 AM UTC+12, Ian Lance Taylor wrote:
>
> On Fri, Aug 7, 2020 at 6:54 PM Robert Engels > wrote:
> >
> > I’d really like to see an example of generic code that takes both string
> and numeric types that uses operators. Sorting/searching is one but as I
> alre
On Aug 13, 2020, at 3:29 PM, Michael Jones wrote:
>
> The all-or-none aspect would be sidestepped if it were allowed to define
> "partial generics":
>
> func A (T1, T2) (...){}
>
> func B(T)(...){ A(T,int)(...){...} }
>
> Allowing B to exist just means running the whole generic thing iter
On Thu, Aug 13, 2020 at 3:09 PM roger peppe wrote:
>
> I do feel that the "all or nothing" nature of type parameter lists (if you
> specify one type parameter, you must explicitly specify all of the others
> too, even if they could otherwise be inferred) is likely to get in the way
> here. I'd
The all-or-none aspect would be sidestepped if it were allowed to define
"partial generics":
func A (T1, T2) (...){}
func B(T)(...){ A(T,int)(...){...} }
Allowing B to exist just means running the whole generic thing iteratively
until no resolution is changed. If the fixed point still has ge
That's interesting; thanks for the heads up.
My initial reaction is that this perhaps feels a bit "clever", but perhaps
this feeling will go away in time.
Constraint type inference is useful when a function wants to have a type
> name for an element of some other type parameter, or when a functio
Updating ld (via binutils) to 2.33.1 in fixed the issue. Looks like 2.33.1
is the newest available version via TDM-GCC. Thanks for the help!
On Thursday, August 13, 2020 at 3:13:51 PM UTC-4 Ian Lance Taylor wrote:
> On Thu, Aug 13, 2020 at 12:01 PM Corey Gilmore
> wrote:
> >
> > Setup:
> >
On Wed, Aug 12, 2020 at 9:58 AM Markus Heukelom
wrote:
>
>
>
> On Mon, Aug 10, 2020 at 8:30 PM Ian Lance Taylor wrote:
>>
>> Go is a strictly typed languages, and constraints are the meta-types
>> of type parameters.
>
>
> I just realised there might be a distinction between strictly typed and
>
On 13 Aug 2020, at 21:01, Trig wrote:
> Is there a way to get the go module name out of the go mod, if modules
> used, besides opening the go.mod file directly (or another obvious name to
> get the project name I'm not thinking of)?
go list -m
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On Thu, Aug 13, 2020 at 12:01 PM Corey Gilmore wrote:
>
> Setup:
> - Go 1.15
> - https://github.com/mattn/go-sqlite3 SQL driver
> - Windows 10 (2004)
> - Ld.exe (via MingW via TDM-GCC), version 2.25
>
> Prior to go1.15, running "go run main.go" or "go build" would work without
> issue. With go1.
Joe, your question is perfectly answered by Axel.
I'll just share a few (personal) Go "style" comments:
Go likes you to test explicitly for failure where that is possible: did the
open fail, did the pipe break, etc.Multiple return values make this clear
by avoiding the need for a "reserved" error
Setup:
- Go 1.15
- https://github.com/mattn/go-sqlite3 SQL driver
- Windows 10 (2004)
- Ld.exe (via MingW via TDM-GCC), version 2.25
Prior to go1.15, running "go run main.go" or "go build" would work without
issue. With go1.15, the error "ld.exe: unrecognized option
'--high-entropy-va'" occurs.
Is there a way to get the go module name out of the go mod, if modules
used, besides opening the go.mod file directly (or another obvious name to
get the project name I'm not thinking of)?
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No, there isn't, but you can check if the value exists:
x, ok := m[k]
if !ok {
panic("does not exist")
}
You can also wrap that with methods, if you want to avoid the extra check.
I disagree with you that panicking on a non-existent key is better - either
in general, or in the majority of ca
I'm very new to Go - apologies in advance if I'm missing something:
I find it frustrating that there's no way to create a map that does *not*
automatically return a zero value for undefined key access by default.
I love the fact that Go doesn't return "nil" for this use case (I love
Ruby, but I
On Thursday, 13 August 2020 17:21:28 UTC+1, saurav deshpande wrote:
>
> 1. not able to use go cross compiler for compiling desired object file. I
> tried setting goarch and goos but it doesnt work for me.
>
It works for the rest of us. For example: I compile macOS darwin binaries
under Linux.
On Thu, Aug 13, 2020 at 9:22 AM jimmy frasche wrote:
>
> Would the constraints package have Pointer[E], Slice[E], and so on?
Good question. I don't know. We can certainly add them if we see
people using them.
> What happens if you have
> type SC(type E I) interface {
> type []E
> }
>
On Thu, Aug 13, 2020 at 9:21 AM zhizhao wang wrote:
>
> If go plugin .so used by different version of go from compiled, the different
> package error will occur.
> So is there any plan to fix this problem?
I am not aware of anybody working on this.
It's a very hard problem.
Ian
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Hi.
My task is execute command on different routers and receive command output
I'm using *golang.org/x/crypto/ssh* package
Cisco works fine. But on HP output ends on prompt right before actual
command.
Maybe someone have experience executing commands via ssh on HP routers and
can give me some
Hi All,
We've a complex and nested Domain Object *User*
type User struct {
Profile *Profile
// ..
// ..
}
stored in a SQL database as
id, user_name, email, image(*Profile*), category(Profile)
Using Clean Architecture by having SQL Database behind an interface, how
can we best implemen
Pada tanggal Kam, 13 Agu 2020 23.21, menulis:
>
> https://stackoverflow.com/questions/63393803/how-to-handle-large-amount-of-data-on-the-frontend-using-go-template-and-cassand?noredirect=1#comment112097067_63393803
>
> I am using *golang* to load data from CassandraDB and send it to the view
> co
I don't care for the (type T Equaler) example. It makes one thing look
like another.
The rest seems interesting. Obviating and generalizing the * syntax is
certainly promising and a nice justification for type lists.
Would the constraints package have Pointer[E], Slice[E], and so on?
What happen
If go plugin .so used by different version of go from compiled, the
different package error will occur.
So is there any plan to fix this problem?
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I have been trying to develop a basic kernel in golang, few problems I have
faced are:
1. not able to use go cross compiler for compiling desired object file. I
tried setting goarch and goos but it doesnt work for me.
2. I want to use sturctures and interfaces but dont know how should i use
t
https://stackoverflow.com/questions/63393803/how-to-handle-large-amount-of-data-on-the-frontend-using-go-template-and-cassand?noredirect=1#comment112097067_63393803
I am using *golang* to load data from CassandraDB and send it to the view
component, but it takes almost *2min to load 20k rows of d
On Thu, Aug 13, 2020 at 3:53 PM xie cui wrote:
> ..., i know this type struct in generate by compiler, and i need to know
> where is this code, and how to generate the struct fields and methods?
To avoid the possibility of the XY problem, can you please tell more
about the goal of "generating s
On 2020-08-13 14:16, Brian Candler wrote:
> If you want a mutable string, look at []byte instead, and read the excellent
> intro to slices at https://blog.golang.org/slices
Does anyone think the frontend languages can be persuaded to meet the web
standards and switch to Utf-8, rather than sticking
On 2020-08-13 14:16, Brian Candler wrote:
>
> If you want a mutable string, look at []byte instead, and read the excellent
> intro to slices at https://blog.golang.org/slices
>
Also worth remembering that unicode strings aren't necessarily bytes, so
requiring verbose action for byte access, inst
Immutable strings are a useful language feature. For one thing, it makes
them usable as map keys, without having to duplicate the entire contents.
A copy-by-value is cheap (it copies only the pointer and length):
b := a
... but you know that there are never any issues around aliasing, e.g.
package main
import (
"fmt"
"reflect"
)
type Foo struct {
A int
}
func (f *Foo) Test() {
}
func main() {
f := &Foo{}
t := reflect.TypeOf(f)
fmt.Println(t)
}
when call reflect.TypeOf can get a struct desc the type, i know this type
struct in generate by compiler, and i need to know where is th
I've worked on this some more now, and it turns out that while directly
executing the result of `upx -9` breaks,
you can use `upx --exact -9` to compress your exe and then `upx -d` to
decompress it later. The decompressed
executable works with the .debug file.
On Wednesday, August 12, 2020 at 3:
Why would the design not allow the contents of the string to be changed? I
understand that the size and memory allocation for it is immutable.
On Thursday, 13 August 2020 at 18:50:10 UTC+5:30 Jan Mercl wrote:
> On Thu, Aug 13, 2020 at 3:02 PM Sathish VJ wrote:
>
> > Why is this not allowed?
On Thu, Aug 13, 2020 at 3:02 PM Sathish VJ wrote:
> Why is this not allowed?
>
> s := "hello"
> s[0] = 'a' // compile error: cannot assign to s[0]
>
> https://play.golang.org/p/zyJXwhEeKPo
Strings are immutable: once created, it is impossible to change the
contents of a string.
Hello,
> Why is this not allowed?
>
> s := "hello"
> s[0] = 'a' // compile error: cannot assign to s[0]
Because strings are immutable in Go. See
https://golang.org/ref/spec#String_types
You can construct a new string, or convert to byte slive and back.
https://play.golang.org/p/0LvsxCC
Maybe you are asking how to get build version information into the
executable. If yes, then use -ldflags.
https://pmcgrath.net/include-version-information-in-golang-app
On Thursday, 13 August 2020 at 15:12:36 UTC+5:30 seank...@gmail.com wrote:
> go version -m
>
> On Thursday, August 13, 2020
Why is this not allowed?
s := "hello"
s[0] = 'a' // compile error: cannot assign to s[0]
https://play.golang.org/p/zyJXwhEeKPo
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On Wed, 12 Aug 2020 at 16:43, 李晓辉 wrote:
> Maybe `type list` equals to `sum type`
>
> type SignedInteger interface {
>type int, int8, int16, int32, int64
> }
>
> can replaced by
>
> type SignedInteger int|int8|int16|int32|int64
>
Yes, I've had that thought too (and mentioned it as feedba
go version -m
On Thursday, August 13, 2020 at 10:30:56 AM UTC+2 santhoshth...@gmail.com
wrote:
> Hi All,
>
> What is best way to know a executable version without executing it through
> golang?
>
> I tried with reading the executable file through a scanner and matching
> every line with regex
Hi All,
What is best way to know a executable version without executing it through
golang?
I tried with reading the executable file through a scanner and matching
every line with regex (like ngnix regx) but this is not working for all
executables.
Do you have any idea?
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