NAME

       MPI_Type_free - Frees a data type.

SYNTAX

C Syntax

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

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_TYPE_FREE(DATATYPE, IERROR)
            INTEGER   DATATYPE, IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Type_free(datatype, ierror)
            TYPE(MPI_Datatype), INTENT(INOUT) :: datatype
            INTEGER, OPTIONAL, INTENT(OUT) :: 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.

4.1.2                                             Nov 24, 2021                                  MPI_Type_free(3)