/* Copyright 2004,2007,2010,2018 IPB, Universite de Bordeaux, INRIA & CNRS
**
** This file is part of the Scotch software package for static mapping,
** graph partitioning and sparse matrix ordering.
**
** This software is governed by the CeCILL-C license under French law
** and abiding by the rules of distribution of free software. You can
** use, modify and/or redistribute the software under the terms of the
** CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
** URL: "http://www.cecill.info".
**
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**
** In this respect, the user's attention is drawn to the risks associated
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*/
/************************************************************/
/**                                                        **/
/**   NAME       : vgraph_separate_gp.h                    **/
/**                                                        **/
/**   AUTHOR     : Francois PELLEGRINI                     **/
/**                                                        **/
/**   FUNCTION   : These lines are the data declaration    **/
/**                for the Gibbs, Poole, and Stockmeyer    **/
/**                graph separation algorithm.             **/
/**                                                        **/
/**   DATES      : # Version 4.0  : from : 14 may 2004     **/
/**                                 to   : 17 may 2004     **/
/**                # Version 5.1  : from : 04 nov 2010     **/
/**                                 to   : 04 nov 2010     **/
/**                # Version 6.0  : from : 30 apr 2018     **/
/**                                 to   : 30 apr 2018     **/
/**                                                        **/
/************************************************************/

/*
**  The type and structure definitions.
*/

/*+ Method parameters. +*/

typedef struct VgraphSeparateGpParam_ {
  INT                       passnbr;              /*+ Number of passes to do +*/
} VgraphSeparateGpParam;

/*+ Complementary vertex structure. +*/

typedef struct VgraphSeparateGpVertex_ {
  Gnum                      passnum;              /*+ Number of pass when vertex selected   +*/
  Gnum                      distval;              /*+ Current distance from diameter vertex +*/
} VgraphSeparateGpVertex;

/*+ Neighbor queue. +*/

typedef struct VgraphSeparateGpQueue_ {
  Gnum                      headnum;              /*+ Head of distance queue  +*/
  Gnum                      tailnum;              /*+ Tail of distance queue  +*/
  Gnum *                    queutab;              /*+ Array of queue elements +*/
} VgraphSeparateGpQueue;

/*
**  The function prototypes.
*/

int                         vgraphSeparateGp    (Vgraph * restrict const, const VgraphSeparateGpParam * restrict const);

/*
**  The macro definitions.
*/

#define vgraphSeparateGpQueueFlush(queue) ((queue)->headnum = (queue)->tailnum = 0)
#define vgraphSeparateGpQueueEmpty(queue) ((queue)->headnum <= (queue)->tailnum)
#define vgraphSeparateGpQueuePut(queue,vnum) ((queue)->queutab[(queue)->headnum ++] = (vnum))
#define vgraphSeparateGpQueueGet(queue) ((queue)->queutab[(queue)->tailnum ++])
