class Status{
public:
static void empty(MPI_Status * status);
-static int cancelled (MPI_Status * status);
+static int cancelled (const MPI_Status * status);
static void set_cancelled (MPI_Status * status, int flag);
static void set_elements (MPI_Status * status, MPI_Datatype , int count);
-static int get_count(MPI_Status * status, MPI_Datatype datatype);
+static int get_count(const MPI_Status * status, MPI_Datatype datatype);
};