From 6f3dee13a88622d4a4ed5ffc0447658db7a5e88f Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Mon, 28 Oct 2013 20:32:52 +0000
Subject: [PATCH] Extend the Visual C++ workaround to 3 parameters.

To avoid collision with piecewise construction.

[SVN r86506]
---
 include/boost/unordered/detail/extract_key.hpp | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/boost/unordered/detail/extract_key.hpp b/include/boost/unordered/detail/extract_key.hpp
index 6db92799..92524b54 100644
--- a/include/boost/unordered/detail/extract_key.hpp
+++ b/include/boost/unordered/detail/extract_key.hpp
@@ -118,15 +118,16 @@ namespace detail {
             return no_key();
         }
 
-#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
-        template <class Arg1, class Arg2, class... Args>
-        static no_key extract(Arg1 const&, Arg2 const&, Args const&...)
+        template <class Arg1, class Arg2>
+        static no_key extract(Arg1 const&, Arg2 const&)
         {
             return no_key();
         }
-#else
-        template <class Arg, class Arg1>
-        static no_key extract(Arg const&, Arg1 const&)
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+        template <class Arg1, class Arg2, class Arg3, class... Args>
+        static no_key extract(Arg1 const&, Arg2 const&, Arg3 const&,
+                Args const&...)
         {
             return no_key();
         }