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Forward `Iterator::{count,last,nth}` for `IdxRange` random access
| -rw-r--r-- | lib/la-arena/src/lib.rs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/la-arena/src/lib.rs b/lib/la-arena/src/lib.rs index eac9802e3e..63827e0ba9 100644 --- a/lib/la-arena/src/lib.rs +++ b/lib/la-arena/src/lib.rs @@ -184,6 +184,24 @@ impl<T> Iterator for IdxRange<T> { fn size_hint(&self) -> (usize, Option<usize>) { self.range.size_hint() } + + fn count(self) -> usize + where + Self: Sized, + { + self.range.count() + } + + fn last(self) -> Option<Self::Item> + where + Self: Sized, + { + self.range.last().map(|raw| Idx::from_raw(raw.into())) + } + + fn nth(&mut self, n: usize) -> Option<Self::Item> { + self.range.nth(n).map(|raw| Idx::from_raw(raw.into())) + } } impl<T> DoubleEndedIterator for IdxRange<T> { |