From 03cdcf500e1f24536b90fba77cb5513072525ac9 Mon Sep 17 00:00:00 2001
From: X-Hawk <xhawk18@gmail.com>
Date: Wed, 11 May 2022 02:17:02 +0800
Subject: [PATCH] fixed build problem,
 https://github.com/xhawk18/promise-cpp/issues/21

---
 include/promise-cpp/call_traits.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/promise-cpp/call_traits.hpp b/include/promise-cpp/call_traits.hpp
index 6dbf96b..1dabff3 100644
--- a/include/promise-cpp/call_traits.hpp
+++ b/include/promise-cpp/call_traits.hpp
@@ -138,7 +138,7 @@ struct call_traits_impl<RET(T::*)(ARG...), false> {
 
     static fun_type to_std_function(T &obj, RET(T::*func)(ARG...)) {
         return [obj, func](ARG...arg) -> RET {
-            return (const_cast<T &>(obj).*func)(arg...);
+            return (const_cast<typename std::remove_const<T>::type &>(obj).*func)(arg...);
         };
     }