Version française
Home     About     Download     Resources     Contact us    

This site is updated infrequently. For up-to-date information, please visit the new OCaml website at

Browse thread
[Caml-list] Lazy.Value
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2001-05-28 (13:16)
From: Xavier Leroy <Xavier.Leroy@i...>
Subject: Re: [Caml-list] Lazy.Value
> > No, this would be unsound -- like all polymorphic references.
> I know, and I knew perfectly your example, but for Lazy, it is
> different. The structure of this type is visible only because it is
> necessary for the "lazy" statement. Users are not supposed to change
> the reference value by hand.

OK, I see what you mean.  If "lazy e" had a special typing rule and a
special compilation rule -- instead of being expanded into
"ref (Lazy.Delayed (fun () -> e))" during parsing -- then it would be
safe to treat it as generalizable, indeed.

- Xavier Leroy
To unsubscribe, mail  Archives: