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postgres/contrib/cube/cubedata.h

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/* contrib/cube/cubedata.h */
#define CUBE_MAX_DIM (100)
typedef struct NDBOX
{
int32 vl_len_; /* varlena header (do not touch directly!) */
unsigned int dim;
double x[1];
} NDBOX;
#define DatumGetNDBOX(x) ((NDBOX*)DatumGetPointer(x))
#define PG_GETARG_NDBOX(x) DatumGetNDBOX( PG_DETOAST_DATUM(PG_GETARG_DATUM(x)) )
#define PG_RETURN_NDBOX(x) PG_RETURN_POINTER(x)