NAME

       MPI_Type_free - Frees a data type.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_free(MPI_Datatype *datatype)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_TYPE_FREE(DATATYPE, IERROR)
            INTEGER   DATATYPE, IERROR

C++ Syntax

       #include <mpi.h>
       void Datatype::Free()

INPUT/OUTPUT PARAMETER

       datatype  Datatype that is freed (handle).

OUTPUT PARAMETER

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       Marks  the datatype object associated with datatype for de-allocation and sets datatype to
       MPI_DATATYPE_NULL. Any communication that is currently using this datatype  will  complete
       normally. Derived datatypes that were defined from the freed datatype are not affected.

       Freeing  a  datatype  does  not  affect  any  other datatype that was built from the freed
       datatype.  The  system  behaves  as  if  input  datatype  arguments  to  derived  datatype
       constructors are passed by value.

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.