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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