From b719777942cf803cc1652d9865e7970bb0260296 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Fri, 1 Oct 2021 01:07:32 +0300
Subject: [PATCH] Do not rely on result_type for standard function objects on
 C++17 or above

---
 include/boost/bind/detail/result_traits.hpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/boost/bind/detail/result_traits.hpp b/include/boost/bind/detail/result_traits.hpp
index e6b8a44..dedc668 100644
--- a/include/boost/bind/detail/result_traits.hpp
+++ b/include/boost/bind/detail/result_traits.hpp
@@ -21,7 +21,9 @@
 //  See http://www.boost.org/libs/bind/bind.html for documentation.
 //
 
-#if defined(_MSVC_LANG) && _MSVC_LANG >= 17
+#include <boost/config.hpp>
+
+#if BOOST_CXX_VERSION >= 201700L
 #include <functional>
 #endif
 
@@ -48,7 +50,7 @@ template<class F> struct result_traits< unspecified, reference_wrapper<F> >
     typedef typename F::result_type type;
 };
 
-#if defined(_MSVC_LANG) && _MSVC_LANG >= 17
+#if BOOST_CXX_VERSION >= 201700L
 
 template<class T> struct result_traits< unspecified, std::plus<T> >
 {