If i have a list
let l = [(2;"a");(5,"b");(1,"dasdf")];;
How to use a function List.stable_sort
val stable_sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list
How to write correctly
"l = List.stable_sort (cmp (fst 'a)(snd 'a)????) l;;"
--
All the best: Ivo
2010/12/27 Martin Jambon <[email protected]>
> On 12/26/10 09:30, Ivo Seeba wrote:
> > I need a list, or other structures, that enables insert elements of
> > different types.
> > I need a list like [("A",3);("B",[2;3;4]);("A",[[3;4];[1;2]])];.
> > or like
> > let st = ref ();;
> > let insert b = (st:=(b,!st));;
> > insert ("A",3);;
> > insert ("B",[1;2]);;
> >
> > or.
> >
> > let st = ();;
> > let insert b = ( let st = (b,st) );;
> > ..
> > Can anybody help me?
>
> Variants (aka sum types, algebraic data types or tagged unions) are made
> for that purpose:
>
> type value = Int of int | List of value list
>
> let l = [
> ("A", Int 3);
> ("B", List [ Int 2; Int 3; Int 4] );
> ("A", List [ List [ Int 3; Int 4 ];
> List [ Int 1; Int 2 ] ])
> ]
>
>
> Martin
>
>
> > --
> > All the best and a happy new year: Ivo
> >
> > --
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