MPI_Type_get_attr - Retrieves a data type attribute value
       by key


SYNOPSIS

       C:

            #include <mpi.h>

            int MPI_Type_get_attr ( type, type_keyval, attribute_val, flag )
            MPI_Datatype type;
            int type_keyval;
            void *attribute_val;
            int *flag;

       Fortran:

            INCLUDE "mpif.h" (or USE MPI)

            INTEGER type, type_keyval, ierror
            INTEGER(KIND=MPI_ADDRESS_KIND) attribute_val
            LOGICAL flag

            CALL MPI_TYPE_GET_ATTR(type, type_keyval, attrbute_value,
            flag, ierror)


STANDARDS

       This function is defined in the MPI-2 standard.

       This release implements the MPI 1.2 standard, as
       documented by the MPI Forum in the spring 1997 release of
       MPI:  A Message Passing Interface Standard.


DESCRIPTION

       The MPI_Type_get_attr routine retrieves a data type
       attribute value by key.  This routine accepts the
       following parameters:

       type      Specifies the data type to which the attribute
                 is attached (handle).

       type_keyval
                 Specifies the key value (integer).

       attribute_val
                 Returns the attribute value, unless flag is set
                 to false.

       flag      Specifies the presence of an attribute value.
                 If an attribute value was extracted, flag is set
                 to true.  If no attribute is associated with the
                 key, flag is set to false.

                 completion, which is in MPI_SUCCESS.
                 MPI_SUCCESS is defined in the mpif.h file.


NOTES

       Attributes must be extracted from the same language as
       that in which they were inserted.

       For C programs, even though the attribute_val argument is
       declared as void, it is really the address of a void
       pointer.  See the standard for more details.

       For Fortran programs, the attribute_val is a pointer to a
       Fortran integer of kind MPI_ADDRESS_KIND, not a pointer to
       a void.


SEE ALSO

        MPI_Type_create(3), MPI_Type_set_attr(3),
       MPI_Type_delete_attr(3), MPI_Type_create_keyval(3),
       MPI_Type_free_keyval(3)


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