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#ifndef _block_h
#define _block_h


#include "idef.h"

#ifdef __cplusplus
extern "C" {
#endif

/* the block structure points into an array (usually of atom_ids).
   It is a list of starting indices for objects of consecutive ids, such
   as molecules.
   For example, if this block denotes molecules, then the first molecule
   ranges from index[0] to index[1]-1 in the atom list.

   This makes the mapping from atoms to molecules O(Nmolecules) instead
   of O(Natoms) in size.  */
typedef struct {
    int      nr;           /* The number of blocks			*/
    atom_id *index;        /* Array of indices (dim: nr+1)  */
    int      nalloc_index; /* The allocation size for index        */
} t_block;

typedef struct {
    int      nr;    /* The number of blocks			*/
    atom_id *index; /* Array of indices in a (dim: nr+1)	*/
    int      nra;   /* The number of atoms          */
    atom_id *a;     /* Array of atom numbers in each group  */
    /* (dim: nra)				*/
    /* Block i (0<=i<nr) runs from		*/
    /* index[i] to index[i+1]-1. There will */
    /* allways be an extra entry in index	*/
    /* to terminate the table		*/
    int nalloc_index;           /* The allocation size for index        */
    int nalloc_a;               /* The allocation size for a            */
} t_blocka;


#ifdef __cplusplus
}
#endif

#endif
