From a685e20578325b70ac0dba1fe245ab9c5299aafa Mon Sep 17 00:00:00 2001
From: jzmaddock <jzmaddock@gmail.com>
Date: Thu, 22 Jan 2015 17:50:18 +0000
Subject: [PATCH] Fix mpl conceptual failure.

---
 include/boost/type_traits/integral_constant.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/boost/type_traits/integral_constant.hpp b/include/boost/type_traits/integral_constant.hpp
index 6c43ece..b8e6250 100644
--- a/include/boost/type_traits/integral_constant.hpp
+++ b/include/boost/type_traits/integral_constant.hpp
@@ -67,6 +67,7 @@ namespace boost{
    template <bool val>
    struct integral_constant<bool, val>
    {
+      typedef mpl::integral_c_tag tag;
       typedef integral_constant<bool, val> type;
       static const bool value = val;