NAME

       MPI_Type_get_attr - Returns the attribute associated with a data type.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_get_attr(MPI_Datatype type, int type_keyval, void *attribute_val, int *flag)

Fortran Syntax (see FORTRAN 77 NOTES)

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_TYPE_GET_ATTR(TYPE, TYPE_KEYVAL, ATTRIBUTE_VAL, FLAG, IERROR)
            INTEGER   TYPE, TYPE_KEYVAL, IERROR
            INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
            LOGICAL FLAG

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Type_get_attr(datatype, type_keyval, attribute_val, flag, ierror)
            TYPE(MPI_Datatype), INTENT(IN) :: datatype
            INTEGER, INTENT(IN) :: type_keyval
            INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: attribute_val
            LOGICAL, INTENT(OUT) :: flag
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

C++ Syntax

       #include <mpi.h>
       bool MPI::Datatype::Get_attr(int type_keyval, void* attribute_val) const

INPUT PARAMETERS

       type      Data type to which the attribute is attached (handle).

       type_keyval
                 Key value (integer).

OUTPUT PARAMETERS

       attribute_val
                 Attribute value, unless flag = false

       flag      "false" if no attribute is associated with the key (logical).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       For  the  given data type, MPI_Type_get_attr returns an attribute value that corresponds to the specified
       key value.

FORTRAN 77 NOTES

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

            INTEGER*MPI_ADDRESS_KIND ATTRIBUTE_VAL

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

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 ALSO

       MPI_Type_set_attr