Function mpi::ffi::OMPI_C_MPI_NULL_COPY_FN

pub unsafe extern fn OMPI_C_MPI_NULL_COPY_FN(comm: MPI_Comm,
                                             comm_keyval: c_int,
                                             extra_state: *mut c_void,
                                             attribute_val_in: *mut c_void,
                                             attribute_val_out: *mut c_void,
                                             flag: *mut c_int)
                                             -> c_int