int refcount_;
MPI_Op op_;
public:
+ Request();
Request(void *buf, int count, MPI_Datatype datatype, int src, int dst, int tag, MPI_Comm comm, unsigned flags);
MPI_Comm comm();
int src();
int dst();
int tag();
int flags();
+ int detached();
void print_request(const char *message);
void start();