From a116ae7bd64b0ef3698725301703c2b8a2729387 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20G=C3=BCndling?= <felix.guendling@gmail.com>
Date: Sat, 12 Oct 2024 23:04:31 +0200
Subject: [PATCH] add missing include

---
 include/cista/hashing.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/cista/hashing.h b/include/cista/hashing.h
index 3b60f30..1f91a1b 100644
--- a/include/cista/hashing.h
+++ b/include/cista/hashing.h
@@ -3,6 +3,7 @@
 #include <chrono>
 #include <cstdint>
 #include <functional>
+#include <optional>
 #include <string>
 #include <string_view>
 #include <tuple>