Golang将任何结构存储在其他结构字段中

Question

I have this code:

type TestData struct {
    Key string
}

type TemporaryStoreItem struct {
    key string
    data interface{}
    aliveUntil time.Time
}

func (s *TemporaryStoreItem) SetData(src interface{}) {
    src = s.data
}

data := TestData{
    Key: "value",
}

item := TemporaryStoreItem{
    key:     "item1",
    data:    data,
    aliveUntil: time.Now(),
}
oldItem := TestData{}
item.SetData(&oldItem)

I need to save any data or pointer to data in 'data' field of TemporaryStoreItem, and i need to get data as TestData struct(or any else source struct), what i do wrong, and is it possible to implement this idea?

Answer 1

func (s *TemporaryStoreItem) Data()interface{} {
    return s.data
}
data := TestData{
    Key: "TestData",
}

item := TemporaryStoreItem{
    key:     "item1",
    data:    data,
    aliveUntil: time.Now(),
}
oldItem := item.Data()
fmt.Println(oldItem)