constexpr unsigned MPI_REQ_GENERALIZED = 0x800;
constexpr unsigned MPI_REQ_COMPLETE = 0x1000;
constexpr unsigned MPI_REQ_BSEND = 0x2000;
+constexpr unsigned MPI_REQ_MATCHED = 0x4000;
+constexpr unsigned MPI_REQ_CANCELLED = 0x8000;
enum class SmpiProcessState { UNINITIALIZED, INITIALIZING, INITIALIZED /*(=MPI_Init called)*/, FINALIZED };