From 5b1f0ac8c2529cb5fa1085a0cac797d937df1119 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Mon, 25 Mar 2024 01:37:13 +0100
Subject: entity: allow readers to const fields

---
 entity/concepts.hpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'entity')

diff --git a/entity/concepts.hpp b/entity/concepts.hpp
index 682360dd..e30a2c5e 100644
--- a/entity/concepts.hpp
+++ b/entity/concepts.hpp
@@ -66,6 +66,11 @@ struct read_field<Obj, Type, Type (Obj::*)() const> {
     static constexpr Type read(const Obj& x, Type (Obj::*r)() const) { return (x.*r)(); }
 };
 
+template<typename Obj, typename Type>
+struct read_field<Obj, Type, const Type Obj::*> {
+    static constexpr Type read(const Obj& x, const Type Obj::*r) { return x.*r; }
+};
+
 template<typename Obj, typename Type>
 struct read_field<Obj, Type, Type Obj::*> {
     static constexpr Type read(const Obj& x, Type Obj::*r) { return x.*r; }
-- 
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