New CAT call

Revision as of 11:12, 27 October 2006 by Konradm (Talk | contribs) (→‎Introcution)

Introcution

The ECMA standard introduces a new solution to the CAT call problem. Covariant redefinition of a formal argument is only possible to an detatchable type: 

class A
feature
   f (a: ANY) do end
end
 
class B1
inherit A redefine f end
feature
   f (a: STRING) do end   -- not valid
end
 
class B2
inherit A redefine f end
feature
   f (a: ?STRING) do end   -- valid
end
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