在Golang中动态创建结构数组

Question

I try to create a generic function that accepts any struct value and create a array of that struct type. Here is the code I tried. But I get the error "t is not a type". How can I implement this.

    type RegAppDB struct {
    nm   string
    data []interface{}
}

func CreateRegTable(tbl string, rec interface{}) RegAppDB {
    t := reflect.TypeOf(rec)
    fmt.Println(t)
    return RegAppDB{"log", []t}
}

Answer 1

Go does not support generics, and any attempt to do something like that is not going to work out well. In your specific case, there are a couple of key problems:

• You cannot use a variable as a type. Go is compile-time static typed, so anything that gets type information at runtime (i.e. reflect.TypeOf) happens too late to use the way you're trying to do it.
• Equally important, your struct's field is of type []interface{}, which means the only type you can use for that field is []interface{}. []string, for example, is a different type, and cannot be assigned to that field.