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--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--            G N A T . M O S T _ R E C E N T _ E X C E P T I O N           --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--                     Copyright (C) 2000-2005, AdaCore                     --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package provides routines for accessing the most recently raised

--  exception. This may be useful for certain logging activities. It may

--  also be useful for mimicing implementation dependent capabilities in

--  Ada 83 compilers, but see also GNAT.Current_Exceptions for this usage.

with Ada.Exceptions;

package GNAT.Most_Recent_Exception is

   -----------------

   -- Subprograms --

   -----------------

   function Occurrence

     return Ada.Exceptions.Exception_Occurrence;

   --  Returns the Exception_Occurrence for the most recently raised exception

   --  in the current task. If no exception has been raised in the current task

   --  prior to the call, returns Null_Occurrence.

   function Occurrence_Access

     return Ada.Exceptions.Exception_Occurrence_Access;

   --  Similar to the above, but returns an access to the occurrence value.

   --  This value is in a task specific location, and may be validly accessed

   --  as long as no further exception is raised in the calling task.

   --  Note: unlike the routines in GNAT.Current_Exception, these functions

   --  access the most recently raised exception, regardless of where they

   --  are called. Consider the following example:

   --     exception

   --        when Constraint_Error =>

   --          begin

   --             ...

   --          exception

   --             when Tasking_Error => ...

   --          end;

   --

   --          --  Assuming a Tasking_Error was raised in the inner block,

   --          --  a call to GNAT.Most_Recent_Exception.Occurrence will

   --          --  return information about this Tasking_Error exception,

   --          --  not about the Constraint_Error exception being handled

   --          --  by the current handler code.

end GNAT.Most_Recent_Exception;