package body Things is
function "="
(A, B : in Thing)
return Boolean is
begin
return A.Self_Image = B.Self_Image;
end "=";
procedure Draw
(This : in Thing;
X, Y : in Integer) is
begin
if This.Self_Image /= null then
This.Self_Image.Draw (X, Y);
end if;
end Draw;
end Things;