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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT LIBRARY COMPONENTS                          --
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--                                                                          --
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--       A D A . C O N T A I N E R S . R E D _ B L A C K _ T R E E S        --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2004-2011, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- This unit was originally developed by Matthew J Heaney.                  --
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------------------------------------------------------------------------------
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--  This package declares the tree type used to implement ordered containers
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package Ada.Containers.Red_Black_Trees is
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   pragma Pure;
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   type Color_Type is (Red, Black);
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   generic
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      type Node_Type (<>) is limited private;
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      type Node_Access is access Node_Type;
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   package Generic_Tree_Types is
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      type Tree_Type is tagged record
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         First  : Node_Access;
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         Last   : Node_Access;
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         Root   : Node_Access;
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         Length : Count_Type := 0;
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         Busy   : Natural := 0;
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         Lock   : Natural := 0;
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      end record;
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   end Generic_Tree_Types;
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   generic
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      type Node_Type is private;
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   package Generic_Bounded_Tree_Types is
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      type Nodes_Type is array (Count_Type range <>) of Node_Type;
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      --  Note that objects of type Tree_Type are logically initialized (in the
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      --  sense that representation invariants of type are satisfied by dint of
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      --  default initialization), even without the Nodes component also having
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      --  its own initialization expression. We only initializae the Nodes
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      --  component here in order to prevent spurious compiler warnings about
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      --  the container object not being fully initialized.
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      type Tree_Type (Capacity : Count_Type) is tagged record
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         First  : Count_Type := 0;
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         Last   : Count_Type := 0;
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         Root   : Count_Type := 0;
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         Length : Count_Type := 0;
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         Busy   : Natural := 0;
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         Lock   : Natural := 0;
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         Free   : Count_Type'Base := -1;
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         Nodes  : Nodes_Type (1 .. Capacity) := (others => <>);
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      end record;
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   end Generic_Bounded_Tree_Types;
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end Ada.Containers.Red_Black_Trees;

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