+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT LIBRARY COMPONENTS --
--- --
--- G N A T . C U R R E N T _ E X C E P T I O N --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1996-2000 Ada Core Technologies, Inc. --
--- --
--- 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- 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.
-
--- The routines in this package are associated with a particular exception
--- handler, and can only be called from within an exception handler. See
--- also the package GNAT.Most_Recent_Exception, which provides access to
--- the most recently raised exception, and is not limited to static calls
--- from an exception handler.
-
-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.
-
- -- Note: all these functions return useful information only if
- -- called statically from within an exception handler, and they
- -- return information about the exception corresponding to the
- -- handler in which they appear. This is NOT the same as the most
- -- recently raised exception. Consider the example:
-
- -- exception
- -- when Constraint_Error =>
- -- begin
- -- ...
- -- exception
- -- when Tasking_Error => ...
- -- end;
- --
- -- -- Exception_xxx at this point returns the information about
- -- -- the constraint error, not about any exception raised within
- -- -- the nested block since it is the static nesting that counts.
-
- -----------------------------------
- -- 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;
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