From 7d4bb24bf66d746ef8137fce6ea657d14d02de98 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Mon, 14 Sep 2015 22:03:04 +0200
Subject: [PATCH] Workaround for old compilers like MSVC 7.1

Without the indirection, a compilation error was triggered in line 106
---
 .../detail/composite_member_pointer_type.hpp           | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/boost/type_traits/detail/composite_member_pointer_type.hpp b/include/boost/type_traits/detail/composite_member_pointer_type.hpp
index ecb4b68..a747ee4 100644
--- a/include/boost/type_traits/detail/composite_member_pointer_type.hpp
+++ b/include/boost/type_traits/detail/composite_member_pointer_type.hpp
@@ -84,6 +84,14 @@ template<class C1, class C2> struct common_member_class
     >::type type;
 };
 
+//This indirection avoids compilation errors on some older 
+//compilers like MSVC 7.1
+template<class CT, class CB>
+struct common_member_class_pointer_to_member
+{
+    typedef CT CB::* type;
+};
+
 template<class C1, class T1, class C2, class T2> struct composite_member_pointer_type<T1 C1::*, T2 C2::*>
 {
 private:
@@ -95,7 +103,7 @@ private:
 
 public:
 
-    typedef CT CB::* type;
+    typedef typename common_member_class_pointer_to_member<CT, CB>::type type;
 };
 
 } // namespace type_traits_detail