Version française
Home     About     Download     Resources     Contact us    
Browse thread
[Caml-list] Sumtypes of records
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: -- (:)
From: Ville-Pertti Keinonen <will@e...>
Subject: Re: [Caml-list] Sumtypes of records

> Why can't constructors of sumtypes take nameless records? (Warning 
> stupid example follows)
>  
> type plop = Foo | Bar {age : int};;

  ...

Probably because it wouldn't make much sense.  Either the only way you 
could access age in the above is by matching Bar { age = x }, which is 
not very useful (you might as well have Bar of int, or a tuple for 
multiple fields), or the record type needs to have a name so that x in 
the pattern Bar x has some printable type.

-------------------
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