From 1bdc08b0adb9bda514b9828d08136ee55d599ddc Mon Sep 17 00:00:00 2001
From: Alexander Karatarakis <alex@karatarakis.com>
Date: Sun, 30 Jul 2023 12:31:37 -0700
Subject: [PATCH] Specify std::invocable<FieldEntry> concept

---
 include/fixed_containers/reflection.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/fixed_containers/reflection.hpp b/include/fixed_containers/reflection.hpp
index 58fbd08a..1cafd876 100644
--- a/include/fixed_containers/reflection.hpp
+++ b/include/fixed_containers/reflection.hpp
@@ -6,6 +6,7 @@
 
 #include <array>
 #include <cassert>
+#include <concepts>
 #include <string_view>
 #include <tuple>
 
@@ -67,7 +68,7 @@ class FieldEntry
     [[nodiscard]] constexpr int depth() const { return depth_; }
 };
 
-template <typename T, typename Func>
+template <typename T, std::invocable<FieldEntry> Func>
 constexpr void for_each_field_entry(const T& instance, Func func)
 {
     auto converter = [&func]<typename... Args>(