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2:30:33，burak serdar写道：
>
> On Sat, Nov 2, 2019 at 12:20 AM 林风 <petel...@gmail.com <javascript:>>
> wrote:
> >
> > 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?
>
>
> There is no built-in way to do that. I don't think you can do that
> with reflect either. However, if you need such decorators, you can use
> an interface or a function pointer:
>
> type fib interface {
> fib(int) int
> }
>
> func f(in fib) {
> in.fib(...)
> }
>
> You can pass in an implementation of fib that will do whatever you want.
>
> With a function pointer:
>
> func f(fib func(int) int) {
> fib(...)
> }
>
> And if you need to count how many times f calls fib:
>
> ...
> count:=0
> f(func(in int) int {
> count++
> return originalFib(in)
> }
> }
>
>
>
> >
> >
> >
> >
> >
> >
> > --
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>
>
>
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