From 8c9f695b39f7be060953927edb661cdd02f8906b Mon Sep 17 00:00:00 2001
From: magz <11150183+TheMagzuz@users.noreply.github.com>
Date: Mon, 17 Nov 2025 14:50:28 +0100
Subject: [PATCH] make `Heap::as_slice` not panic on empty heap

---
 src/dary/heap.rs                       | 6 +++++-
 tests/priority_queue_tests/as_slice.rs | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/dary/heap.rs b/src/dary/heap.rs
index 5e5ee5d..ff44828 100644
--- a/src/dary/heap.rs
+++ b/src/dary/heap.rs
@@ -207,7 +207,11 @@ where
     /// assert!(slice.contains(&("z", 99)));
     /// ```
     pub(crate) fn as_slice(&self) -> &[(N, K)] {
-        &self.tree[offset::<D>()..]
+        if self.tree.is_empty() {
+            &self.tree
+        } else {
+            &self.tree[offset::<D>()..]
+        }
     }
 }
 
diff --git a/tests/priority_queue_tests/as_slice.rs b/tests/priority_queue_tests/as_slice.rs
index ba9952c..644d898 100644
--- a/tests/priority_queue_tests/as_slice.rs
+++ b/tests/priority_queue_tests/as_slice.rs
@@ -20,6 +20,7 @@ pub fn test_as_slice<const D: usize>(mut pq: DaryHeap<usize, f64, D>) {
     pq.clear();
     assert!(pq.is_empty());
     let mut vec = vec![];
+    assert!(pq.as_slice().is_empty());
 
     let mut rng = rand::rng();
     for node in 0..N {