Function mpi::ffi::PMPI_Unpack

pub unsafe extern fn PMPI_Unpack(inbuf: *const c_void,
                                 insize: c_int,
                                 position: *mut c_int,
                                 outbuf: *mut c_void,
                                 outcount: c_int,
                                 datatype: MPI_Datatype,
                                 comm: MPI_Comm)
                                 -> c_int