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