Scippy

SoPlex

Sequential object-oriented simPlex

cring.h
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1/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2/* */
3/* This file is part of the class library */
4/* SoPlex --- the Sequential object-oriented simPlex. */
5/* */
6/* Copyright (c) 1996-2024 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_