Indexed list

[axu@rdsnet.ro (Alex Crivat)]

Say I have a generic package wich implements a doubly linked list.
What I want to do, and I could not find a way to do it, is to use this
list as an array with the posibility of using the index operator "()"
(I know, in ada this is not used as an operator).
For example in C++ language I can do this by overloading the "[]"
operator. So when I call the list with this operator and a interer
index as parameter it returns the element coresponding to that index.

Example:
A : ITEM;
L : DLIST; -- DLIST is a list of ITEM type elements;

And I want to be able to do something like:
A := L(3); -- wich will put in A the fourth element of my list.

Is there a way of doing this in Ada using operators or should I use a
custom function;