Function libnotcurses_sys::nccells_double_box

pub unsafe extern "C" fn nccells_double_box(
    n: *mut ncplane, 
    styles: u32, 
    channels: u64, 
    ul: *mut nccell, 
    ur: *mut nccell, 
    ll: *mut nccell, 
    lr: *mut nccell, 
    hl: *mut nccell, 
    vl: *mut nccell
) -> c_int