From 484487f958b8ae1664645b558ca168a8c75c9b1c Mon Sep 17 00:00:00 2001
From: Glen Fernandes <glen.fernandes@gmail.com>
Date: Fri, 17 Jul 2020 09:24:21 -0400
Subject: [PATCH] MSVC2017 /std:c++17 warnings in allocator access

---
 include/boost/core/allocator_access.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/boost/core/allocator_access.hpp b/include/boost/core/allocator_access.hpp
index bfe08f7..b3ea62b 100644
--- a/include/boost/core/allocator_access.hpp
+++ b/include/boost/core/allocator_access.hpp
@@ -137,6 +137,11 @@ template<class A>
 struct allocator_difference_type {
     typedef typename A::difference_type type;
 };
+#elif defined(BOOST_MSVC)
+template<class A>
+struct allocator_difference_type {
+    typedef typename std::allocator_traits<A>::difference_type type;
+};
 #else
 template<class A, class = void>
 struct allocator_difference_type {
@@ -156,6 +161,11 @@ template<class A>
 struct allocator_size_type {
     typedef typename A::size_type type;
 };
+#elif defined(BOOST_MSVC)
+template<class A>
+struct allocator_size_type {
+    typedef typename std::allocator_traits<A>::size_type type;
+};
 #else
 template<class A, class = void>
 struct allocator_size_type {