如何在Go中创建可变类型的切片？

Question

I have a function.

func doSome(v interface{}) {

}  

If I pass by pointer a slice of struct into the function, the function must fill the slice.

type Color struct {
}
type Brush struct {
}

var c []Color
doSome(&c) // after с is array contains 3 elements type Color

var b []Brush
doSome(&b) // after b is array contains 3 elements type Brush

Maybe I need use reflection, but how?

Answer 1

func doSome(v interface{}) {

    s := reflect.TypeOf(v).Elem()
    slice := reflect.MakeSlice(s, 3, 3)
    reflect.ValueOf(v).Elem().Set(slice)

}