------------------------------------------------------------------------------
--                                                                          --
--                            Matreshka Project                             --
--                                                                          --
--         Localization, Internationalization, Globalization for Ada        --
--                                                                          --
--                        Runtime Library Component                         --
--                                                                          --
------------------------------------------------------------------------------
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-- Copyright © 2009-2011, Vadim Godunko <vgodunko@gmail.com>                --
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------------------------------------------------------------------------------
--  $Revision: 1808 $ $Date: 2011-06-20 00:21:55 +0400 (Mon, 20 Jun 2011) $
------------------------------------------------------------------------------
--  This generic package allows to store value of arbitrary integer type in
--  the Value.
------------------------------------------------------------------------------

generic
   type Num is range <>;

package League.Holders.Generic_Integers is

   pragma Preelaborate;

   Value_Tag : constant Tag;

   function Element (Self : Holder) return Num;
   --  Returns internal value.

   procedure Replace_Element (Self : in out Holder; To : Num);
   --  Set value. Tag of the value must be set before this call.

   function To_Holder (Item : Num) return Holder;
   --  Creates new Value from specified value.

private

   type Integer_Container is new Abstract_Integer_Container with record
      Value : Num;
   end record;

   overriding function Constructor
    (Is_Empty : not null access Boolean) return Integer_Container;

   overriding function Get
    (Self : not null access constant Integer_Container)
       return Universal_Integer;

   overriding procedure Set
    (Self : not null access Integer_Container; To : Universal_Integer);

   overriding function First
    (Self : not null access constant Integer_Container)
       return Universal_Integer;

   overriding function Last
    (Self : not null access constant Integer_Container)
       return Universal_Integer;

   Value_Tag : constant Tag := Tag (Integer_Container'Tag);

end League.Holders.Generic_Integers;
