From f1906e914eaaf76408a0a4e69c61c457c08abba8 Mon Sep 17 00:00:00 2001
From: Nathan Cook <nathan.cook@hexagon.com>
Date: Wed, 28 Feb 2018 13:43:34 +0000
Subject: [PATCH] use _MSC_VER to guard fix for C4596 when compiling with
 MSVC141

---
 include/boost/range/concepts.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/range/concepts.hpp b/include/boost/range/concepts.hpp
index 6fac727..6fef2ea 100644
--- a/include/boost/range/concepts.hpp
+++ b/include/boost/range/concepts.hpp
@@ -252,7 +252,12 @@ namespace boost {
                  n = i - j;
              }
          private:
+ // MSVC 14.1 - avoid C4596: 'difference_type': illegal qualified name in member declaration
+ #if defined(_MSC_VER) && _MSC_VER >= 1912 
              BOOST_DEDUCED_TYPENAME difference_type n;
+ #else
+             BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept::difference_type n;
+ #endif
              Iterator i;
              Iterator j;
  #endif