2016. december 4., vasárnap 15:14:44 UTC+1 időpontban Neng Kong a
következőt írta:
>
> I replace
> demo := HandlerFunc{}
> to
> var demo HandlerFunc
>
> also can not
> [john@localhost gweb]$ go run inspiration_by_golang_http.go
> panic: runtime error: invalid memory address or nil pointer dereference
> [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x401035]
>
> goroutine 1 [running]:
> panic(0x47a9a0, 0xc42000a090)
> /home/john/go/src/runtime/panic.go:500 +0x1a1
> main.HandlerFunc.Call(0x0, 0x1, 0x2)
> /home/john/gweb/inspiration_by_golang_http.go:14 +0x35
> main.main()
> /home/john/gweb/inspiration_by_golang_http.go:20 +0x40
> exit status 2
>
>
> Maube i can not imitate it
>
>>
>>>
Please start with tour.golang.org, learn the definition of pointer!
In Go everything is initialized with it's type's zereo value - for an
function (HandlerFunc is a function), it is nil.
As the runtime kindly says, you try to dereference it by calling it, that
results in panic.
So, as I've said, try
demo := HandlerFunc(func(x,y int) { fmt.Println("Called", x, y) })
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