Function convertAndSet

bridge.go:435–478

(to, from reflect.Value, setMethod reflect.Value)

}

func convertAndSet(to, from reflect.Value, setMethod reflect.Value) (err error) {
	var toType reflect.Type
	if setMethod.IsValid() {
		toType = setMethod.Type().In(0)
	} else {
		toType = to.Type()
	}
	fromType := from.Type()
	defer func() {
		// TODO This is catching more than it should. There are calls
		//      to custom code below that should be isolated.
		if v := recover(); v != nil {
			err = fmt.Errorf("cannot use %s as a %s", fromType, toType)
		}
	}()
	if fromType == typeList && toType.Kind() == reflect.Slice {
		list := from.Interface().(*List)
		from = reflect.MakeSlice(toType, len(list.data), len(list.data))
		elemType := toType.Elem()
		for i, elem := range list.data {
			from.Index(i).Set(reflect.ValueOf(elem).Convert(elemType))
		}
	} else if fromType == typeMap && toType.Kind() == reflect.Map {
		qmap := from.Interface().(*Map)
		from = reflect.MakeMap(toType)
		elemType := toType.Elem()
		for i := 0; i < len(qmap.data); i += 2 {
			key := reflect.ValueOf(qmap.data[i])
			val := reflect.ValueOf(qmap.data[i+1])
			if val.Type() != elemType {
				val = val.Convert(elemType)
			}
			from.SetMapIndex(key, val)
		}
	} else if toType != fromType {
		from = from.Convert(toType)
	}
	if setMethod.IsValid() {
		setMethod.Call([]reflect.Value{from})
	} else {
		to.Set(from)
	}
	return nil
}

var (
	dataValueSize  = uintptr(unsafe.Sizeof(C.DataValue{}))