From: Jacques Le Normand <rathereasy@gmail.com>
To: caml-list caml-list <caml-list@yquem.inria.fr>
Subject: class constraints
Date: Fri, 27 Mar 2009 10:06:03 -0400 [thread overview]
Message-ID: <f74178430903270706h4be1bfa3p56913b557d5a4b95@mail.gmail.com> (raw)
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Dear list,
I'm having a little problem understanding constraints in objects. Consider
the following code:
class type foo =
object
method get_parent : foo
end
class type foo2 =
object
constraint foo2 = #foo
method baz : float
method get_parent : foo2
end
it gives me the following error:
The abbreviation foo2 expands to type < baz : float; get_parent : foo2 >
but is used with type #foo
but foo2 is clearly a subtype of foo. What am I doing wrong? I'm using ocaml
3.10.2
--Jacques Le Normand
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next reply other threads:[~2009-03-27 14:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-27 14:06 Jacques Le Normand [this message]
2009-03-27 14:22 ` [Caml-list] " Peng Zang
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