1    	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2    	/*                                                                           */
3    	/*                  This file is part of the class library                   */
4    	/*       SoPlex --- the Sequential object-oriented simPlex.                  */
5    	/*                                                                           */
6    	/*  Copyright (c) 1996-2023 Zuse Institute Berlin (ZIB)                      */
7    	/*                                                                           */
8    	/*  Licensed under the Apache License, Version 2.0 (the "License");          */
9    	/*  you may not use this file except in compliance with the License.         */
10   	/*  You may obtain a copy of the License at                                  */
11   	/*                                                                           */
12   	/*      http://www.apache.org/licenses/LICENSE-2.0                           */
13   	/*                                                                           */
14   	/*  Unless required by applicable law or agreed to in writing, software      */
15   	/*  distributed under the License is distributed on an "AS IS" BASIS,        */
16   	/*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
17   	/*  See the License for the specific language governing permissions and      */
18   	/*  limitations under the License.                                           */
19   	/*                                                                           */
20   	/*  You should have received a copy of the Apache-2.0 license                */
21   	/*  along with SoPlex; see the file LICENSE. If not email to soplex@zib.de.  */
22   	/*                                                                           */
23   	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24   	
25   	#ifndef _CRING_H_
26   	#define _CRING_H_
27   	
28   	/***************************************************************
29   	                    Double linked ring
30   	 ***************************************************************/
31   	
32   	#define initDR(ring)    ((ring).prev = (ring).next = &(ring))
33   	
34   	#define init2DR(elem, ring)                                     \
35   	{                                                               \
36   	(elem).next = (ring).next;                                 \
37   	(elem).next->prev = &(elem);                               \
38   	(elem).prev = &(ring);                                     \
39   	(ring).next = &(elem);                                     \
40   	}
41   	
42   	#define removeDR(ring)                                          \
43   	{                                                               \
44   	(ring).next->prev = (ring).prev;                           \
45   	(ring).prev->next = (ring).next;                           \
46   	}
47   	
48   	#endif // _CRING_H_
49