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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT LIBRARY COMPONENTS                          --
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--                                                                          --
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--            G N A T . M O S T _ R E C E N T _ E X C E P T I O N           --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--                     Copyright (C) 2000-2008, AdaCore                     --
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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 2,  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.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
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-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
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-- Boston, MA 02110-1301, USA.                                              --
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--                                                                          --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- unit, or you link  this unit with other files  to produce an executable, --
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-- this  unit  does not  by itself cause  the resulting  executable  to  be --
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-- covered  by the  GNU  General  Public  License.  This exception does not --
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-- however invalidate  any other reasons why  the executable file  might be --
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-- covered by the  GNU Public License.                                      --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides routines for accessing the most recently raised
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--  exception. This may be useful for certain logging activities. It may
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--  also be useful for mimicking implementation dependent capabilities in
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--  Ada 83 compilers, but see also GNAT.Current_Exceptions for this usage.
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with Ada.Exceptions;
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package GNAT.Most_Recent_Exception is
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   -----------------
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   -- Subprograms --
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   -----------------
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   function Occurrence
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     return Ada.Exceptions.Exception_Occurrence;
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   --  Returns the Exception_Occurrence for the most recently raised exception
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   --  in the current task. If no exception has been raised in the current task
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   --  prior to the call, returns Null_Occurrence.
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   function Occurrence_Access
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     return Ada.Exceptions.Exception_Occurrence_Access;
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   --  Similar to the above, but returns an access to the occurrence value.
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   --  This value is in a task specific location, and may be validly accessed
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   --  as long as no further exception is raised in the calling task.
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   --  Note: unlike the routines in GNAT.Current_Exception, these functions
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   --  access the most recently raised exception, regardless of where they
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   --  are called. Consider the following example:
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   --     exception
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   --        when Constraint_Error =>
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   --          begin
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   --             ...
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   --          exception
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   --             when Tasking_Error => ...
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   --          end;
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   --
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   --          --  Assuming a Tasking_Error was raised in the inner block,
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   --          --  a call to GNAT.Most_Recent_Exception.Occurrence will
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   --          --  return information about this Tasking_Error exception,
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   --          --  not about the Constraint_Error exception being handled
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   --          --  by the current handler code.
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end GNAT.Most_Recent_Exception;

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