From 6172f9a30e6d985f6710000b7adfb3991da86927 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Sun, 8 Apr 2018 14:00:37 +0100
Subject: [PATCH] Use type traits' true type in boost::blank

---
 include/boost/blank.hpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/boost/blank.hpp b/include/boost/blank.hpp
index d0fe5ab..918723c 100644
--- a/include/boost/blank.hpp
+++ b/include/boost/blank.hpp
@@ -20,7 +20,7 @@
 #include "boost/detail/templated_streams.hpp"
 #endif // BOOST_NO_IOSTREAM
 
-#include "boost/mpl/bool.hpp"
+#include "boost/type_traits/integral_constant.hpp"
 #include "boost/type_traits/is_empty.hpp"
 #include "boost/type_traits/is_pod.hpp"
 #include "boost/type_traits/is_stateless.hpp"
@@ -36,19 +36,19 @@ struct blank
 
 template <>
 struct is_pod< blank >
-    : mpl::true_
+    : boost::true_type
 {
 };
 
 template <>
 struct is_empty< blank >
-    : mpl::true_
+    : boost::true_type
 {
 };
 
 template <>
 struct is_stateless< blank >
-    : mpl::true_
+    : boost::true_type
 {
 };