Re: Problem with generic parameter

generic
    type Indices is (<>);
package Generic_Root
    type Measurement is array (Indices) of Measurement;


The reason that I don't do that is that that would have to instantiate
a copy of Generic_Root _and_ Generic_Root.Child for each choice of
array indices.


No you don't. (The above example was misleading.)

generic
   type Indices is (<>);
package Generic_Root.Child_By_Marius is
   type Measurement_Array is
      array (Indices range <>) of Measurement;
end;

with Generic_Root;
with Generic_Root.Child_By_Marius;
procedure Marius_Demo is
   type Scalar is digits 15;
   package Measurements is
      new Generic_Root (Scalar => Scalar);
   package Measurements_Text_IO is
      new Measurements.Child_By_Marius
        (Indices => Positive);
   use Measurements_Text_IO;               --|
   Array_1 : Measurement_Array (1 .. 10);  --| *HERE*
   Array_2 : Measurement_Array (2 .. 20);  --|
begin
   null;
end;

.

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