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with Unchecked_Deallocation;

with Xlbt_Arithmetic;  
use Xlbt_Arithmetic;  
with Xlbt_Proc_Var;  
use Xlbt_Proc_Var;  
with Xlbt_Univ_Ptr;  
use Xlbt_Univ_Ptr;

package Xlbt_Extension4 is
------------------------------------------------------------------------------
-- X Library Extensions - Full Interface Part 2
--
-- Xlbt_Extension4 - Types dealing with extensions to the X Library and to
-- the X Protocol.
------------------------------------------------------------------------------
-- Copyright 1989 - 1991 by Rational, Santa Clara, California.
-- Copyright 1985 - 1989 by the Massachusetts Institute of Technology
--
--                  All Rights Reserved.
--
-- Permission to use, copy, modify, and distribute this software and its
-- documentation for any purpose and without fee is hereby granted,
-- provided that the above copyright notice(s) appear in all copies and that
-- both that copyright notice(s) and this permission notice appear in
-- supporting documentation, and that the names of MIT or Rational not be
-- used in advertising or publicity pertaining to distribution of the software
-- without specific, written prior permission.
--
-- MIT and Rational disclaim all warranties with regard to this software,
-- including all implied warranties of merchantability and fitness, in no
-- event shall MIT or Rational be liable for any special, indirect or
-- consequential damages or any damages whatsoever resulting from loss of use,
-- data or profits, whether in an action of contract, negligence or other
-- tortious action, arising out of or in connection with the use or performance
-- of this software.
------------------------------------------------------------------------------

--\f

------------------------------------------------------------------------------
-- X_Extension_Number - each extension gets a unique (to this program) number
------------------------------------------------------------------------------

    type X_Extension_Number is new S_Long;

--/ if Length_Clauses then
    for X_Extension_Number'Size use 32;
--/ end if;

------------------------------------------------------------------------------
-- X_Ext_Data - Extensions need a way to hang private data on some structures.
------------------------------------------------------------------------------

    type X_Ext_Data_Rec;  
    type X_Ext_Data is access X_Ext_Data_Rec;

--/ if Enable_Deallocation then
    pragma Enable_Deallocation (X_Ext_Data);
--/ end if;

    type X_Ext_Data_Rec is  
        record  
            Number       :        -- number returned by Register_Extension
               X_Extension_Number   := 0;  
            Free_Private :        -- called to free private storage
               X_Procedure_Variable := None_X_Procedure_Variable;
            ----X_Free_Extension_Data.Pv
            Private_Data :        -- private extension storage
               X_Universal_Pointer := None_X_Universal_Pointer;  
            Next :                -- next item on list of data for structure
               X_Ext_Data := null;  
        end record;

    procedure Free_X_Ext_Data is new Unchecked_Deallocation (X_Ext_Data_Rec,  
                                                             X_Ext_Data);
    ----Free a single X_Ext_Data record.

    procedure Free_X_Ext_Data_List (List : in out X_Ext_Data);
    ----Free the linked list of X_Ext_Data records.

    None_X_Ext_Data : constant X_Ext_Data := null;

end Xlbt_Extension4;