nil_method.c
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上传日期:2013-05-12
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- /* GNU Objective C Runtime nil receiver function
- Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
- Contributed by Kresten Krab Thorup
- This file is part of GNU CC.
- GNU CC is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 2, or (at your option) any later version.
- GNU CC is distributed in the hope that it will be useful, but WITHOUT 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 along with
- GNU CC; see the 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 you link this library with files compiled with
- GCC to produce an executable, this does not 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 General Public License. */
- /* This is the nil method, the function that is called when the receiver
- of a method is nil */
- #include "runtime.h"
- #if debug
- id
- nil_method (id receiver, SEL op, ...)
- {
- raiseEvent (InvalidArgument, "The message `%s' was sent to nil.n",
- sel_get_name (op));
- return nil;
- }
- #else
- id
- nil_method(id receiver, SEL op, ...)
- {
- return receiver;
- }
- #endif