Function PMPI_Unpack_external

pub unsafe extern "C" fn PMPI_Unpack_external(
    datarep: *const c_char,
    inbuf: *const c_void,
    insize: MPI_Aint,
    position: *mut MPI_Aint,
    outbuf: *mut c_void,
    outcount: c_int,
    datatype: MPI_Datatype,
) -> c_int