使关闭时指针恐慌的切片指针

Question

I have the following code :

var ANIMATIONS *[]*SDL.Animable

....

func main() {
    *ANIMATIONS = make([]*SDL.Animable, 0, 100)

But its panicking when running. What is the right way of initializing this?

Error :

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x4afe3a]

goroutine 1 [running, locked to thread]:
main.main()

Answer 1

To fix, you want:

s := make([]*SDL.Animable, 0, 100)

ANIMATIONS = &s

The reason your code was panicking is basically you were dereferencing a nil pointer (*ANIMATIONS). You need to get a reference variable to store your new slice & then you can get it's address (&s) and store that in your pointer.

Note: the following will NOT work &make([]*SDL.Animable, 0, 100) - as you cannot get the address of a returned result - hence the need to store the result & get it's address.