[go-nuts] Re: How can i create a counter decorator in go?
thanks for the idea, totally works. simple than my interface implement.
@burak serdar not sure you are talking about this kind of program or not,
if yes, then sorry for my misunderstanding. it works.
https://play.golang.org/p/DnSc5vgItsL
在 2019年11月2日星期六 UTC+8下午7:44:02，Tamás Gulácsi写道：
>
> 2019. november 2., szombat 7:20:02 UTC+1 időpontban 林风 a következőt írta:
>>
>> let's say i have a function or method to get fib
>>
>> func fib(n int){
>> ...
>> return fib(n-1) + fib(n-2)
>> }
>>
>>
>> now i want to add a counter to track how many times i have called to fib.
>>
>> in python or jave i can easy use `decorator patten` to do it.
>>
>> but in go, you can not change fib since it is a function. if you define
>> fib as a method, you cannot do it either since go did not have
>> `Inherited`. you cannot call father class.
>>
>> so golang did not support such thing? can we just reflect to do so?
>>
>>
>>
>>
>>
>>
>> You CAN override the function, but only if it is overridable (exported
> and changeable):
>
> ```
> var Fib func(n int)
> func init(){
> Fib = func(n int) {
> ...
> return Fib(n-1) + Fib(n-2)
> }
> }
> ```
> this way you can override it:
> ```
> ori := pkg.Fib
> pkg.Fib = func(n int) {
> count++
> ori(n)
> }
> ```
>
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[go-nuts] Re: How can i create a counter decorator in go?
2019. november 2., szombat 7:20:02 UTC+1 időpontban 林风 a következőt írta:
>
> let's say i have a function or method to get fib
>
> func fib(n int){
> ...
> return fib(n-1) + fib(n-2)
> }
>
>
> now i want to add a counter to track how many times i have called to fib.
>
> in python or jave i can easy use `decorator patten` to do it.
>
> but in go, you can not change fib since it is a function. if you define
> fib as a method, you cannot do it either since go did not have `Inherited`
> . you cannot call father class.
>
> so golang did not support such thing? can we just reflect to do so?
>
>
>
>
>
>
> You CAN override the function, but only if it is overridable (exported and
changeable):
```
var Fib func(n int)
func init(){
Fib = func(n int) {
...
return Fib(n-1) + Fib(n-2)
}
}
```
this way you can override it:
```
ori := pkg.Fib
pkg.Fib = func(n int) {
count++
ori(n)
}
```
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[go-nuts] Re: How can i create a counter decorator in go?
Hi, thanks for your answer, and i really cannot understander your code. can
you write a more clear version in go play ground?
i already create a template. pls notice that we cannot change origin fib
function.
https://play.golang.org/p/hYerZ2fv0dT
在 2019年11月2日星期六 UTC+8下午2:20:02，林风写道：
>
> let's say i have a function or method to get fib
>
> func fib(n int){
> ...
> return fib(n-1) + fib(n-2)
> }
>
>
> now i want to add a counter to track how many times i have called to fib.
>
> in python or jave i can easy use `decorator patten` to do it.
>
> but in go, you can not change fib since it is a function. if you define
> fib as a method, you cannot do it either since go did not have `Inherited`
> . you cannot call father class.
>
> so golang did not support such thing? can we just reflect to do so?
>
>
>
>
>
>
>
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