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67476f08fc
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@909 72102866-910b-0410-8b05-ffd578937521
141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/* Handling various types in a uniform manner.
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* Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
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*
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* Author: Albin L. Jones <Albin.L.Jones@Dartmouth.EDU>
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* Created: Sun Oct 9 13:14:41 EDT 1994
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* Updated: Sun Feb 11 01:33:41 EST 1996
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* Serial: 96.02.10.07
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*
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* This file is part of the GNU Objective C Class Library.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/**** Included Headers *******************************************************/
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#include <objects/callbacks.h>
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/**** Type, Constant, and Macro Definitions **********************************/
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/* WARNING: Don't change this unless you know what you're getting into! */
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static objects_callbacks_t ___objects_callbacks_standard =
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{
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(objects_hash_func_t) objects_void_p_hash,
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(objects_compare_func_t) objects_void_p_compare,
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(objects_is_equal_func_t) objects_void_p_is_equal,
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(objects_retain_func_t) objects_void_p_retain,
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(objects_release_func_t) objects_void_p_release,
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(objects_describe_func_t) objects_void_p_describe,
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0
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};
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/**** Function Implementations ***********************************************/
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/** Getting the standard callbacks **/
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objects_callbacks_t
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objects_callbacks_standard(void)
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{
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return ___objects_callbacks_standard;
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}
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/** Standardizing callbacks **/
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objects_callbacks_t
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objects_callbacks_standardize(objects_callbacks_t callbacks)
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{
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if (callbacks.hash == 0)
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callbacks.hash = objects_callbacks_standard().hash;
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if (callbacks.compare == 0 && callbacks.is_equal == 0)
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{
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callbacks.compare = objects_callbacks_standard().compare;
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callbacks.is_equal = objects_callbacks_standard().is_equal;
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}
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if (callbacks.retain == 0)
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callbacks.retain = objects_callbacks_standard().retain;
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if (callbacks.release == 0)
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callbacks.release = objects_callbacks_standard().release;
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return callbacks;
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}
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/** Using callbacks **/
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size_t
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objects_hash (objects_callbacks_t callbacks, void *thing, void *user_data)
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{
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if (callbacks.hash != 0)
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return callbacks.hash(thing, user_data);
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else
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return objects_callbacks_standard().hash(thing, user_data);
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}
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int
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objects_compare (objects_callbacks_t callbacks,
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void *thing1,
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void *thing2,
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void *user_data)
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{
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if (callbacks.compare != 0)
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return callbacks.compare(thing1, thing2, user_data);
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else if (callbacks.is_equal != 0)
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return !(callbacks.is_equal(thing1, thing2, user_data));
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else
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return objects_callbacks_standard().compare(thing1, thing2, user_data);
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}
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int
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objects_is_equal (objects_callbacks_t callbacks,
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void *thing1,
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void *thing2,
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void *user_data)
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{
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if (callbacks.is_equal != 0)
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return callbacks.is_equal(thing1, thing2, user_data);
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else if (callbacks.compare != 0)
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return !(callbacks.compare(thing1, thing2, user_data));
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else
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return objects_callbacks_standard().is_equal(thing1, thing2, user_data);
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}
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void *
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objects_retain (objects_callbacks_t callbacks, void *thing, void *user_data)
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{
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if (callbacks.retain != 0)
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return callbacks.retain(thing, user_data);
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else
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return objects_callbacks_standard().retain(thing, user_data);
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}
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void
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objects_release (objects_callbacks_t callbacks, void *thing, void *user_data)
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{
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if (callbacks.release != 0)
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callbacks.release(thing, user_data);
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else
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objects_callbacks_standard().release(thing, user_data);
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return;
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}
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void *
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objects_describe(objects_callbacks_t callbacks, void *thing, void *user_data)
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{
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if (callbacks.release != 0)
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return callbacks.describe(thing, user_data);
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else
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return objects_callbacks_standard().describe(thing, user_data);
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}
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