From c24661a636337943abcb01626a79377956d76a39 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Mon, 9 Jul 2018 20:41:33 +0300
Subject: [PATCH] Remove ill-formed MSVC-specific code that doesn't compile
 with /permissive-

---
 include/boost/range/concepts.hpp | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/boost/range/concepts.hpp b/include/boost/range/concepts.hpp
index 6fef2ea..4ba7242 100644
--- a/include/boost/range/concepts.hpp
+++ b/include/boost/range/concepts.hpp
@@ -252,12 +252,7 @@ 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
+             BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept<Iterator>::difference_type n;
              Iterator i;
              Iterator j;
  #endif