What is lldb_expr in Swift Playground?
I was trying to show basic inheritance to someone and how the super initializer is always called by default when overriding init:
class Animal{
init(){
println("Animal has been initialized!")
}
}
class Dog:Animal{
var feet:Int = 4
override init(){
println("Dog has been initialized!")
}
}
var d = Dog()
Why am I getting {__lldb_expr_380.Animal feet 4}
the last line? It disappears when I create an instance variable under the animal class.
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I'm not 100% about it, but it seems reasonable and logical to me.
Your class is Animal
empty, so the compiler needs a way to express / print the values of the class / it. So what it does is print __lldb_expr_380.Animal
, because the compiler doesn't know what else to do. If you add a property, for example legs
, the result will be as follows: {{legs 2} feet 4}
.
So, in my understanding, whenever you have this empty superclass, the compiler will be "confused" and the error that will happen is that it will just print out __llb_expr_:some_number:.ClassName
instead of something like {}
.
Link: http://discuss.codewithchris.com/t/episode-7-classes-error---lldb-expr-/150
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