NAME

       MPI_Type_size, MPI_Type_size_x - Returns the number of bytes occupied by entries in a data
       type.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_size(MPI_Datatype datatype, int *size)
       int MPI_Type_size_x(MPI_Datatype datatype, MPI_Count *size)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_TYPE_SIZE(DATATYPE, SIZE, IERROR)
            INTEGER   DATATYPE, SIZE, IERROR
       MPI_TYPE_SIZE_X(DATATYPE, SIZE, IERROR)
            INTEGER   DATATYPE
               INTEGER(KIND=MPI_COUNT_KIND) SIZE
               INTEGER IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Type_size(datatype, size, ierror)
            TYPE(MPI_Datatype), INTENT(IN) :: datatype
            INTEGER, INTENT(OUT) :: size
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror
       MPI_Type_size_x(datatype, size, ierror)
            TYPE(MPI_Datatype), INTENT(IN) :: datatype
            INTEGER(KIND=MPI_COUNT_KIND), INTENT(OUT) :: size
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

C++ Syntax

       #include <mpi.h>
       int Datatype::Get_size() const

INPUT PARAMETER

       datatype  Datatype (handle).

OUTPUT PARAMETERS

       size      Datatype size (integer).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Type_size returns the total size, in bytes, of  the  entries  in  the  type  signature
       associated  with  datatype;  i.e.,  the  total size of the data in a message that would be
       created with this datatype. Entries that occur multiple times in the datatype are  counted
       with  their  multiplicity.  For  either function, if the size parameter cannot express the
       value to be returned (e.g., if the parameter is too small to hold the output value), it is
       set to MPI_UNDEFINED.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument. C++ functions do not return errors. If the  default
       error  handler  is  set  to  MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
       mechanism will be used to throw an MPI::Exception object.

       Before the error value is returned, the current MPI error handler is called.  By  default,
       this  error  handler aborts the MPI job, except for I/O function errors. The error handler
       may   be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error    handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.

FORTRAN 77 NOTES

       The  MPI  standard  prescribes  portable  Fortran  syntax  for  the   SIZE   argument   of
       MPI_Type_size_x only for Fortran 90. FORTRAN 77 users may use the non-portable syntax

            INTEGER*MPI_COUNT_KIND SIZE

       where  MPI_COUNT_KIND is a constant defined in mpif.h and gives the length of the declared
       integer in bytes.