File : g-curexc.ads


------------------------------------------------------------------------------
--                                                                          --
--                         GNAT LIBRARY COMPONENTS                          --
--                                                                          --
--                    C U R R E N T _ E X C E P T I O N                     --
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--                            $Revision: 1.1 $                              --
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--         Copyright (C) 1996-1999 Ada Core Technologies, Inc.              --
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------------------------------------------------------------------------------

--  This package provides routines for obtaining the current exception
--  information in Ada 83 style. In Ada 83, there was no official method
--  for obtaining exception information, but a number of vendors supplied
--  routines for this purpose, and this package closely approximates the
--  interfaces supplied by DEC Ada 83 and VADS Ada.

package GNAT.Current_Exception is
pragma Pure (Current_Exception);

   -----------------
   -- Subprograms --
   -----------------

   function Exception_Information return String;
   --  Returns the result of calling Ada.Exceptions.Exception_Information
   --  with an argument that is the Exception_Occurrence corresponding to
   --  the current exception. Returns the null string if called from outside
   --  an exception handler.

   function Exception_Message return String;
   --  Returns the result of calling Ada.Exceptions.Exception_Message with
   --  an argument that is the Exception_Occurrence corresponding to the
   --  current exception. Returns the null string if called from outside an
   --  exception handler.

   function Exception_Name return String;
   --  Returns the result of calling Ada.Exceptions.Exception_Name with
   --  an argument that is the Exception_Occurrence corresponding to the
   --  current exception. Returns the null string if called from outside an
   --  exception handler.

   -----------------------------------
   -- Use of Library Level Renaming --
   -----------------------------------

   --  For greater compatibility with existing legacy software, library
   --  level renaming may be used to create a function with a name matching
   --  one that is in use. For example, some versions of VADS Ada provided
   --  a functin called Current_Exception whose semantics was identical to
   --  that of GNAT. The following library level renaming declaration:

   --    with GNAT.Current_Exception;
   --    function Current_Exception
   --      renames GNAT.Current_Exception.Exception_Name;

   --  placed in a file called current_exception.ads and compiled into the
   --  application compilation environment, will make the function available
   --  in a manner exactly compatible with that in VADS Ada 83.

private
   pragma Import (Intrinsic, Exception_Information);
   pragma Import (intrinsic, Exception_Message);
   pragma Import (Intrinsic, Exception_Name);

end GNAT.Current_Exception;