gcc/ada/a-einuoc.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --     A D A . E X C E P T I O N S . I S _ N U L L _ O C C U R R E N C E    --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --             Copyright (C) 2000 Free Software Foundation, Inc.            --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a GNAT-specific child function of Ada.Exceptions. It provides
  36 --  clearly missing functionality for its parent package, and most reasonably
  37 --  would simply be an added function to that package, but this change cannot
  38 --  be made in a conforming manner.
  39
  40 function Ada.Exceptions.Is_Null_Occurrence
  41   (X    : Exception_Occurrence)
  42    return Boolean
  43 is
  44 begin
  45    --  The null exception is uniquely identified by the fact that the Id
  46    --  value is null. No other exception occurrence can have a null Id.
  47
  48    if X.Id = Null_Id then
  49       return True;
  50    else
  51       return False;
  52    end if;
  53 end Ada.Exceptions.Is_Null_Occurrence;