NAME

       MPI_Type_match_size - Returns an MPI datatype of a given type and size

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_match_size(int typeclass, int size,
            MPI_Datatype *type)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_TYPE_MATCH_SIZE(TYPECLASS, SIZE, TYPE, IERROR)
            INTEGER   TYPECLASS, SIZE, TYPE, IERROR

C++ Syntax

       #include <mpi.h>
       static MPI::Datatype MPI::Match_size(int typeclass, int size)

INPUT PARAMETERS

       typeclass Generic type specifier (integer).

       size      Size, in bytes, of representation (integer).

OUTPUT PARAMETERS

       type      Datatype with correct type and size (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       The  function returns an MPI datatype matching a local variable of type (typeclass, size).
       The returned type is a reference (handle) to a predefined named datatype, not a duplicate.
       This type cannot be freed.

       The  value of typeclass may be set to one of MPI_TYPECLASS_REAL, MPI_TYPECLASS_INTEGER, or
       MPI_TYPECLASS_COMPLEX, corresponding to the desired datatype.

       MPI_type_match_size can be used to obtain a size-specific  type  that  matches  a  Fortran
       numeric  intrinsic  type:  first  call  MPI_Sizeof to compute the variable size, then call
       MPI_Type_match_size to find a suitable datatype. In C and  C++,  use  the  sizeof  builtin
       instead of MPI_Sizeof.

       It is erroneous to specify a size not supported by the compiler.

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.

       See the MPI man page for a full list of MPI error codes.

SEE ALSO

       MPI_Sizeof
       MPI_Type_get_extent