Ada - mehrdimensionales Array initialisieren

[THE_ONE]

Hallo!
Habe den folgenden Ada Code:

-------------------------------------------------------------
type State is (unvisited, visited, wall);
type Lab is array (natural range <>, natural range <>) of State;
type Lab_ptr is access Lab;
laby:Lab_ptr;
.
.
-------------
begin
.
.
laby := new Lab(0..w-1,0..l-1);
.
.
-------------------------------------------------------------

Meine Frage: wie kann ich das gesmate Array laby mit unvisited initialisieren??