MPI_Type_create_struct
int MPI_Type_create_struct(int, int [], MPI_Aint [], MPI_Datatype [], MPI_Datatype *);
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Returns a new datatype that representscount blocks. Each block is defined by an entry in array_of_blocklengths,array_of_displacements, and array_of_types. Displacements are expressed in bytes.