vJASS for mules #8: Visibility

Variables, methods and structs can have two kinds of visibility: Public and private

The meaning of public depends of the context. For methods, instance and static variables (remember?) it means that it can be accessible everywhere the struct is accessible. For structs, it means that it can be accessible everywhere in program. Example:

public struct Book

   public static integer sold 

   public integer isbn 

   public method sell takes unit owner returns nothing

      ...

   endmethod

endstruct

Book kingLear = Book.allocate() // allowed

set Book.sold = 10 // allowed

set kingLear.isbn = 20 // allowed

call kingLear.sell(...) //allowed

Important note: When you don't define a visibility, it is by default public.

Now private has the reverse effect. For methods, instance and static variables, it means that it can be accessible ONLY on its struct. For structs, it means that it can be accessible ONLY on its scope (yes, structs have a scope, too. We will take about it next lesson). Example:

scope structScope

   private struct Book

      private static integer sold

      private integer isbn 

      private method sell takes unit owner returns nothing

         set thistype.sold = 10 // allowed

         set this.isbn = 20 // allowed

      endmethod

  endstruct

   Book kingLear = Book.allocate() // allowed

   set Book.sold = 10 // NOT allowed

   set kingLear.isbn = 20 // NOT allowed

   call kingLear.sell(...) // NOT allowed

endscope

Book romeu = Book.allocate() // NOT allowed

Answer mentally:

• What means the keyword public?
• And private?
• What happens when we don't define a visibility?

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