cring.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the class library                   */
/*       SoPlex --- the Sequential object-oriented simPlex.                  */
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/*  Copyright (c) 1996-2023 Zuse Institute Berlin (ZIB)                      */
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/*  Licensed under the Apache License, Version 2.0 (the "License");          */
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/*      http://www.apache.org/licenses/LICENSE-2.0                           */
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#ifndef _CRING_H_
#define _CRING_H_

/***************************************************************
                    Double linked ring
 ***************************************************************/

#define initDR(ring)    ((ring).prev = (ring).next = &(ring))

#define init2DR(elem, ring)                                     \
{                                                               \
(elem).next = (ring).next;                                 \
(elem).next->prev = &(elem);                               \
(elem).prev = &(ring);                                     \
(ring).next = &(elem);                                     \
}

#define removeDR(ring)                                          \
{                                                               \
(ring).next->prev = (ring).prev;                           \
(ring).prev->next = (ring).next;                           \
}

#endif // _CRING_H_