MPI binding for MPI_COMM_SIZE

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Neutral Binding
MPI_COMM_SIZE(comm, size) [ IN comm] communicator (handle) [ OUT size] number of processes in the group of comm (integer)

C Binding
int MPI_Comm_size(MPI_Comm comm, int *size)

FORTRAN Binding
MPI_COMM_SIZE(COMM, SIZE, IERROR) INTEGER COMM, SIZE, IERROR

C++ Binding
(in the MPI:: namespace)
int Comm::Get_size() const