Function libnotcurses_sys::ncdirect_double_box

pub unsafe extern "C" fn ncdirect_double_box(
    n: *mut ncdirect, 
    ul: u64, 
    ur: u64, 
    ll: u64, 
    lr: u64, 
    ylen: c_int, 
    xlen: c_int, 
    ctlword: c_uint
) -> c_int

ncdirect_box() with the double box-drawing characters