int number_of_integers, const int* integers,
int number_of_addresses, const MPI_Aint* addresses,
int number_of_datatypes, const MPI_Datatype* datatypes);
+ Datatype_contents(const Datatype_contents&) = delete;
+ Datatype_contents& operator=(const Datatype_contents&) = delete;
~Datatype_contents();
};