Function _argsort_permutation_impl

rust/stringzilla.rs:2231–2251

Helper that takes an adapter (with a concrete type) and performs the FFI call.

(adapter: FAdapter, order: &mut [SortedIdx])

/// Helper that takes an adapter (with a concrete type) and performs the FFI call.
fn _argsort_permutation_impl<FAdapter>(adapter: FAdapter, order: &mut [SortedIdx]) -> Result<(), Status>
where
    FAdapter: Fn(usize) -> &'static [u8],
{
    let wrapper = _PunnedSliceLookupView {
        get_slice: unsafe { _get_slice_fn::<FAdapter>() },
        data: &adapter as *const FAdapter as *const c_void,
    };
    let seq = _SzSequence {
        handle: &wrapper as *const _ as *const c_void,
        count: order.len(),
        get_start: Some(_slice_get_start_punned),
        get_length: Some(_slice_get_length_punned),
    };
    let status = unsafe { sz_sequence_argsort(&seq, core::ptr::null(), order.as_mut_ptr()) };
    if status == Status::Success {
        Ok(())
    } else {
        Err(status)
    }
}

// ----------------------------------------------------------------------
// Intersection functions