From ed58434c88ac03816fa0d232c679d551987b42a9 Mon Sep 17 00:00:00 2001
From: Paul <pfultz2@yahoo.com>
Date: Sun, 29 Dec 2013 05:46:32 -0500
Subject: [PATCH] Add constexpr to conversion operator for bool integral
 constants

---
 include/boost/mpl/bool.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/mpl/bool.hpp b/include/boost/mpl/bool.hpp
index f4bb485..0a6180c 100644
--- a/include/boost/mpl/bool.hpp
+++ b/include/boost/mpl/bool.hpp
@@ -26,7 +26,7 @@ template< bool C_ > struct bool_
     typedef integral_c_tag tag;
     typedef bool_ type;
     typedef bool value_type;
-    operator bool() const { return this->value; }
+    BOOST_CONSTEXPR operator bool() const { return this->value; }
 };
 
 #if !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION)