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use flatbuffers::{Follow, Vector};
/// A trait to access indexed data in a flatbuffer.
/// It has two implementations:
/// 1. a faster &[I] for slices;
/// 2. a slower for flatbuffers::Vector<I>, that uses Follow() internally.
///
/// Note: it intentionally returns values using a copy, because it's faster
/// than by reference.
pub(crate) trait FbIndex<I> {
/// Returns the number of elements.
fn len(&self) -> usize;
/// Returns a copy of the value at the given index.
/// 'index' must be in range [0, len()), otherwise panics.
fn get(&self, index: usize) -> I;
}
impl<I: Copy> FbIndex<I> for &[I] {
#[inline(always)]
fn len(&self) -> usize {
<[I]>::len(self)
}
#[inline(always)]
fn get(&self, index: usize) -> I {
self[index]
}
}
impl FbIndex<()> for () {
#[inline(always)]
fn len(&self) -> usize {
0
}
fn get(&self, _index: usize) {}
}
impl<'a, T: Follow<'a>> FbIndex<T::Inner> for Vector<'a, T> {
#[inline(always)]
fn len(&self) -> usize {
Vector::len(self)
}
#[inline(always)]
fn get(&self, index: usize) -> T::Inner {
Vector::get(self, index)
}
}