prototypeCallOnly

PrototypeCallOnly.cyan

package metaobjectTest


@doc{*
  Annotation 'prototypeCallOnly' should be attached to a method. 
  It assures that the method is only called with a prototype
  as receiver. This is a replacement for 'static' methods
  of Java/C++/C#. An annotated method cannot access 
  non-shared fields and it should be final (either 
  declared with 'final' or the prototype is final).
  
    
*}
open
object PrototypeCallOnly
    
    func run {
        var PrototypeCallOnly p = PrototypeCallOnly();
        // error if uncommented
        // p at: 10;
        // p unary;
        PrototypeCallOnly at: 10;
        PrototypeCallOnly unary;
        
    }

    @prototypeCallOnly        
    final func at: Int n { value = n; }
    
    @prototypeCallOnly        
    final func unary { value = 0; }   
    
    shared var Int value = 0; 
end