/*
 * The Npic library
 *
 * Copyright (C) 2003 Edouard Thiel <Edouard.Thiel@lif.univ-mrs.fr>
 *
 * This library is free software under the terms of the 
 * GNU Lesser General Public License (LGPL) version 2.1.
*/

/*
 * mask_gsym.h - 22/01/2004
 *
 * Computation of all G-symmetries for generating a half or full mask.
*/


#ifndef NPIC__MASK_GSYM_H
#define NPIC__MASK_GSYM_H


#define NPIC_GSYM_MAX 20

typedef struct {
    int dim,                    /* Dimension and coordinates */
        x[NPIC_GSYM_MAX],       /* (x[1], x[2], ..., x[dim]) */
        half,                   /* Compute 1: half, 0: full mask */
                
        dir[NPIC_GSYM_MAX],     /* Direction and position for */
        pos[NPIC_GSYM_MAX],     /* Johnson's permutation algorithm */
                
        k, kmax,                /* Number of sign combination */
        bin_mask;               /* Binary mask to forbid combinations */
} Npic_gsym;


/* PUBLIC */

void NpicGsymPermuInit (Npic_gsym *gs);
int  NpicGsymPermuNext (Npic_gsym *gs);
void NpicGsymCombiInit (Npic_gsym *gs);
int  NpicGsymCombiNext (Npic_gsym *gs);
void NpicGsymInit (Npic_gsym *gs);
int  NpicGsymNext (Npic_gsym *gs);
void NpicGsymPrint (Npic_gsym *gs);


/* PRIVATE */



#endif /* NPIC__MASK_GSYM_H */