What is the Objective-C way of getting a nullable bool?

Question

How should I go about getting a bool value that I can assign true, false and nil to in Objective-C? What is the Objective-C way of doing this? Much like C#'s Nullable<bool>. I'm looking to be able to use the nil value to represent undefined.

Answer 1

typedef struct TNullableBool

{

bool boolSwitchFlag;

bool isNull;

} * TNullableBool;