From e4aa48bc4bbcedca2be115874692aee9e20283a0 Mon Sep 17 00:00:00 2001
From: Murray Cumming <murrayc@murrayc.com>
Date: Mon, 2 May 2016 20:45:51 +0200
Subject: [PATCH] tree_traits: Add include for boost::tie().

This lets examples/graph_as_tree compile.
---
 include/boost/graph/tree_traits.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/graph/tree_traits.hpp b/include/boost/graph/tree_traits.hpp
index 0843628c..a04c750f 100644
--- a/include/boost/graph/tree_traits.hpp
+++ b/include/boost/graph/tree_traits.hpp
@@ -6,6 +6,8 @@
 #ifndef BOOST_TREE_STRUCTURE_HPP
 #define BOOST_TREE_STRUCTURE_HPP
 
+#include <boost/tuple/tuple.hpp> //For boost::tie()
+
 namespace boost {
 
   template <class T>