From 78e98bd32825981a0fc601c8d7bc7ad9715fbdce Mon Sep 17 00:00:00 2001
From: Austin Seipp <aseipp@pobox.com>
Date: Thu, 18 Apr 2024 15:10:06 -0500
Subject: [PATCH] lib: add `[T; N]` instance for `ContentHash`

Natural extension of the existing `[T]` instance.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Change-Id: Ib7f6fd829096b2cac8e3d7b9471a92ddb76a621b
---
 lib/src/content_hash.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/src/content_hash.rs b/lib/src/content_hash.rs
index 4738697680..7e49ddaa82 100644
--- a/lib/src/content_hash.rs
+++ b/lib/src/content_hash.rs
@@ -79,6 +79,15 @@ impl<T: ContentHash> ContentHash for [T] {
     }
 }
 
+impl<T: ContentHash, const N: usize> ContentHash for [T; N] {
+    fn hash(&self, state: &mut impl DigestUpdate) {
+        state.update(&(N as u64).to_le_bytes());
+        for x in self {
+            x.hash(state);
+        }
+    }
+}
+
 impl<T: ContentHash> ContentHash for Vec<T> {
     fn hash(&self, state: &mut impl DigestUpdate) {
         self.as_slice().hash(state)