From 62fe316637b77cced8563400e0494f0712ee2bfe Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Mon, 7 Mar 2022 23:30:41 +0100
Subject: [PATCH] Pass `func` as `const &` in `modify` function

---
 lmdb-typed.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lmdb-typed.hh b/lmdb-typed.hh
index 3f596be..ec1bd75 100644
--- a/lmdb-typed.hh
+++ b/lmdb-typed.hh
@@ -807,7 +807,7 @@ public:
         }
 
         //! Modifies an item "in place" updating indexes.
-        void modify(IDType id, std::function<void(T &)> func)
+        void modify(IDType id, const std::function<void(T &)> &func)
         {
             T t;
             if (!this->get(id, t))