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[Caml-list] a class as method parameter...
- Michael
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Date: | 2004-05-28 (09:25) |
From: | Michael <micha-1@f...> |
Subject: | [Caml-list] a class as method parameter... |
Hi, I don't understand why this doesn't work: class one = object val name = "test" method name = name end;; class two = object method take_one o -> o#name end;; that gives: Some type variables are unbound in this type: class two : object method take_one : < name : 'a; .. > -> 'a end The method take_one has type (< name : 'b; .. > as 'a) -> 'b where 'a is unbound I have to declare: class two = object method take_one : 'a. (#one as 'a) -> string = fun o -> o#name end;; .. to get it work (from chapter 3.10 ) why has it to be declared this way? ( and not: class two = object method take_one ( o : #one ) = o#name end;; which also does not work: The method take_one has type (#one as 'a) -> string where 'a is unbound ) ?? thanks, Michael ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners