From fa906d916d8d126d3cc3a2b4ab9a29fa27bee62d Mon Sep 17 00:00:00 2001
From: marc0246 <40955683+marc0246@users.noreply.github.com>
Date: Tue, 27 Aug 2024 06:51:48 +0200
Subject: [PATCH] Add `SlotId::INVALID`

---
 src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index cf48253..b1647f7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1087,6 +1087,11 @@ pub struct SlotId {
 }
 
 impl SlotId {
+    pub const INVALID: Self = SlotId {
+        index: u32::MAX,
+        generation: NonZeroU32::MAX,
+    };
+
     #[cfg(test)]
     const fn new(index: u32, generation: u32) -> Self {
         assert!(generation & OCCUPIED_BIT != 0);
@@ -1116,8 +1121,9 @@ impl SlotId {
     }
 
     #[inline(always)]
+    #[must_use]
     pub const fn tag(self) -> u32 {
-        self.generation() & TAG_MASK
+        self.generation.get() & TAG_MASK
     }
 }