dependency question

when i use RegisterDependency to implements singleton bean

```
func main(){
IrisApp = iris.New()
IrisApp.RegisterDependency(NewService)
party:=IrisApp.Party("/test")
irisMvc := mvc.New(party)
irisMvc.handle(new(controller))
}

func NewService(){
return &Test{name:"kangkang"}
}
type Test struct{
name string
}

type controller struct{
test Test
}

func (c *controller)Get(){
fmt.Println(&c.test)
}
```

myquestion is that does the c.test is singleton? not new every time