Generic package array parameter

[Mario Amado Alves <maa@di.fct.unl.pt>]

I am trying to rewrite

generic
  type X is (<>);
  type Y is (<>);
  Table: array(X, Y) of X;
package Foo is
...

in order to circuvent the 'anonymous array definition not allowed here'
constraint. I tried

generic
  type X is (<>);
  type Y is (<>);
  Table: Table_Type;
package Foo is
  type Table_Type is array(X, Y) of X;
...

and of course got '"Table_Type" is undefined'. Then I tried

generic
  type X is (<>);
  type Y is (<>);
  type Table_Type is array(X, Y) of X;
  Table: Table_Type;
package Foo is
...

which of course works, but is odd, and requires an equally odd
instantiation:

type My_X is ...;
type My_Y is ...;
type My_Table_Type is array(My_X, My_Y) of My_X;
My_Table: My_Table_Type := (...);
package My_Foo is new Foo(My_X, My_Y, My_Table_Type, My_Table);
...

This works, but is ugly and stupid. Is there a smart way to rewrite it?

(I feel I am again on the verge of giving up the Ada generic programming
idiom. What is this Ada thing with anonymous array types?)

Thanks.

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