Function opt_ref

src/backend/linux_raw/conv.rs:236–243

(t: Option<&T>)

/// syscall.
#[inline]
pub(super) fn opt_ref<T: Sized, Num: ArgNumber>(t: Option<&T>) -> ArgReg<'_, Num> {
    // This optimizes into the equivalent of `transmute(t)`, and has the
    // advantage of not requiring `unsafe`.
    match t {
        Some(t) => by_ref(t),
        None => raw_arg(null_mut()),
    }
}

/// Convert a `c_int` into an `ArgReg`.
///