From a91afcbde4b82f8643ce78095c8c8cf6261aedbd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Sat, 17 Oct 2015 09:39:34 +0200
Subject: [PATCH] Use BOOST_MOVE_HELPERS_RETURN_SFINAE_BROKEN as some compilers
 prefer return type SFINAE while others don't support it.

---
 include/boost/intrusive/detail/key_nodeptr_comp.hpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/boost/intrusive/detail/key_nodeptr_comp.hpp b/include/boost/intrusive/detail/key_nodeptr_comp.hpp
index 98660c7..171a2e8 100644
--- a/include/boost/intrusive/detail/key_nodeptr_comp.hpp
+++ b/include/boost/intrusive/detail/key_nodeptr_comp.hpp
@@ -60,14 +60,18 @@ struct key_nodeptr_comp
 
    //key_forward
    template<class T>
-   const key_type &key_forward
-      (const T &node, typename enable_if<is_node_ptr<T> >::type* =0) const
+   typename enable_if<is_node_ptr<T>, const key_type &>::type key_forward(const T &node) const
    {  return key_of_value()(*traits_->to_value_ptr(node));  }
 
+   #if defined(BOOST_MOVE_HELPERS_RETURN_SFINAE_BROKEN)
    template<class T>
-   const T &key_forward
-      (const T &key, typename disable_if<is_node_ptr<T> >::type* =0) const
+   const T &key_forward (const T &key, typename disable_if<is_node_ptr<T> >::type* =0) const
    {  return key;  }
+   #else
+   template<class T>
+   typename disable_if<is_node_ptr<T>, const T &>::type key_forward(const T &key) const
+   {  return key;  }
+   #endif
 
    //operator() 1 arg
    template<class KeyType>