Re: [go-nuts] reflect Call method on nested struct
Hi Max,
this makes the config even simpler since i do not need to be sure that the
field is nil.
I will try this out for sure.
On Wednesday, May 29, 2019 at 1:56:14 PM UTC+3, Max wrote:
>
> There is another improvement you can do: you are currently using
>
> cfg := Config{Name: }
> r := reflect.ValueOf(cfg)
>
> which means that 'r' will contain a copy of 'cfg' and will not be settable.
> If instead you use:
>
> r := reflect.ValueOf().Elem()
>
> then r will contain a *pointer* to the original 'cfg' and can modify it
> (the reflect.Value 'r' is settable).
> In turn, this also allows to declare 'Config' as follows:
> ```
> type Config struct {
> Name String
> }
> ```
> i.e. removes the need to use a *pointer* to String.
> You also need some minor adjustments to the rest of the code...
>
> A complete example is:
>
> https://play.golang.org/p/AxPE0K_ivxP
>
> On Wednesday, May 29, 2019 at 11:56:42 AM UTC+2, Sotirios Mantziaris wrote:
>>
>> Ok, found it. I should have used the reflect.ValueOf...
>>
>> On Wednesday, May 29, 2019 at 12:53:13 PM UTC+3, Sotirios Mantziaris
>> wrote:
>>>
>>> I did found out that the setter method has to accept a pointer to string.
>>> I have a complete example now which unfortunately don't work correclty.
>>> The value should change but it is emptied out.
>>>
>>> https://play.golang.org/p/OPZKltApEhF
>>>
>>> What am i missing?
>>>
>>> On Wednesday, May 29, 2019 at 10:46:32 AM UTC+3, Jan Mercl wrote:
On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris
wrote:
> I am getting the nested "Name" struct but there are no methods to
call.
> What am i doing wrong (besides using reflection :))?
The method has a pointer receiver:
https://play.golang.org/p/qjhqSvhE9PL
>>>
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Re: [go-nuts] reflect Call method on nested struct
There is another improvement you can do: you are currently using
cfg := Config{Name: }
r := reflect.ValueOf(cfg)
which means that 'r' will contain a copy of 'cfg' and will not be settable.
If instead you use:
r := reflect.ValueOf().Elem()
then r will contain a *pointer* to the original 'cfg' and can modify it
(the reflect.Value 'r' is settable).
In turn, this also allows to declare 'Config' as follows:
```
type Config struct {
Name String
}
```
i.e. removes the need to use a *pointer* to String.
You also need some minor adjustments to the rest of the code...
A complete example is:
https://play.golang.org/p/AxPE0K_ivxP
On Wednesday, May 29, 2019 at 11:56:42 AM UTC+2, Sotirios Mantziaris wrote:
>
> Ok, found it. I should have used the reflect.ValueOf...
>
> On Wednesday, May 29, 2019 at 12:53:13 PM UTC+3, Sotirios Mantziaris wrote:
>>
>> I did found out that the setter method has to accept a pointer to string.
>> I have a complete example now which unfortunately don't work correclty.
>> The value should change but it is emptied out.
>>
>> https://play.golang.org/p/OPZKltApEhF
>>
>> What am i missing?
>>
>> On Wednesday, May 29, 2019 at 10:46:32 AM UTC+3, Jan Mercl wrote:
>>>
>>> On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris
>>> wrote:
>>>
>>> > I am getting the nested "Name" struct but there are no methods to
>>> call.
>>> > What am i doing wrong (besides using reflection :))?
>>>
>>> The method has a pointer receiver: https://play.golang.org/p/qjhqSvhE9PL
>>>
>>
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Re: [go-nuts] reflect Call method on nested struct
Ok, found it. I should have used the reflect.ValueOf... On Wednesday, May 29, 2019 at 12:53:13 PM UTC+3, Sotirios Mantziaris wrote: > > I did found out that the setter method has to accept a pointer to string. > I have a complete example now which unfortunately don't work correclty. > The value should change but it is emptied out. > > https://play.golang.org/p/OPZKltApEhF > > What am i missing? > > On Wednesday, May 29, 2019 at 10:46:32 AM UTC+3, Jan Mercl wrote: >> >> On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris >> wrote: >> >> > I am getting the nested "Name" struct but there are no methods to call. >> > What am i doing wrong (besides using reflection :))? >> >> The method has a pointer receiver: https://play.golang.org/p/qjhqSvhE9PL >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/e2eb5584-242c-4144-ad32-a42583ee8cfe%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] reflect Call method on nested struct
I did found out that the setter method has to accept a pointer to string. I have a complete example now which unfortunately don't work correclty. The value should change but it is emptied out. https://play.golang.org/p/OPZKltApEhF What am i missing? On Wednesday, May 29, 2019 at 10:46:32 AM UTC+3, Jan Mercl wrote: > > On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris > > wrote: > > > I am getting the nested "Name" struct but there are no methods to call. > > What am i doing wrong (besides using reflection :))? > > The method has a pointer receiver: https://play.golang.org/p/qjhqSvhE9PL > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/001a34f6-163e-45fa-84ce-b10214b4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] reflect Call method on nested struct
you are a live saver. thanks very much. reflection is of of these things in any language i suppose. On Wed, 29 May 2019 at 10:46, Jan Mercl <0xj...@gmail.com> wrote: > On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris > wrote: > > > I am getting the nested "Name" struct but there are no methods to call. > > What am i doing wrong (besides using reflection :))? > > The method has a pointer receiver: https://play.golang.org/p/qjhqSvhE9PL > -- Regards, S. Mantziaris -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAEGsCe2AfWreDBbs4OJy8xSxi0Xs-ibxw%3DB4X%2BRwSJpwx60TNg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] reflect Call method on nested struct
On Wed, May 29, 2019 at 9:42 AM Sotirios Mantziaris wrote: > I am getting the nested "Name" struct but there are no methods to call. > What am i doing wrong (besides using reflection :))? The method has a pointer receiver: https://play.golang.org/p/qjhqSvhE9PL -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAA40n-XhXgHagW5wDg%3DuFi2mc6Q%3DoKUrCX01wOFx6aEo2e0O7Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] reflect Call method on nested struct
Hi,
i have a nested struct and i want to call a method on a field.
type String struct {
value string
}
func (s *String) Set(value string) {
s.value = value
}
type Config struct {
Name String
}
I am getting the nested "Name" struct but there are no methods to call.
What am i doing wrong (besides using reflection :))?
Check out the playground link?
https://play.golang.org/p/XSRG5rFWdhq
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