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