Created
July 20, 2019 07:11
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[Go][Reflect] Enforce Pointer & CanSet
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| package main | |
| import ( | |
| "fmt" | |
| "reflect" | |
| ) | |
| func EnforcePtr(obj interface{}) (reflect.Value, error) { | |
| v := reflect.ValueOf(obj) | |
| if v.Kind() != reflect.Ptr { | |
| if v.Kind() == reflect.Invalid { | |
| return reflect.Value{}, fmt.Errorf("expected pointer, but got invalid kind") | |
| } | |
| return reflect.Value{}, fmt.Errorf("expected pointer, but got %v type", v.Type()) | |
| } | |
| if v.IsNil() { | |
| return reflect.Value{}, fmt.Errorf("expected pointer, but got nil") | |
| } | |
| return v.Elem(), nil | |
| } | |
| func canSet(a interface{}) { | |
| v, err := EnforcePtr(a) | |
| if err != nil { | |
| panic(err) | |
| } | |
| if v.CanSet() { | |
| fmt.Println(v.Kind(), " can set") | |
| } else { | |
| fmt.Println(v.Kind(), " can't set") | |
| } | |
| } | |
| func main() { | |
| i := 0 | |
| canSet(&i) | |
| } |
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