From 1a78a62555be32868418fe52f8e330c9d0f95d5a Mon Sep 17 00:00:00 2001
From: Anas Nashif <anas.nashif@intel.com>
Date: Tue, 30 Oct 2012 12:57:26 -0700
Subject: Imported Upstream version 1.49.0

---
 boost/fusion/container/map/detail/key_of_impl.hpp | 32 +++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 boost/fusion/container/map/detail/key_of_impl.hpp

(limited to 'boost/fusion/container/map/detail/key_of_impl.hpp')

diff --git a/boost/fusion/container/map/detail/key_of_impl.hpp b/boost/fusion/container/map/detail/key_of_impl.hpp
new file mode 100644
index 0000000000..5a90c03784
--- /dev/null
+++ b/boost/fusion/container/map/detail/key_of_impl.hpp
@@ -0,0 +1,32 @@
+/*=============================================================================
+    Copyright (c) 2009 Christopher Schmidt
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+
+#ifndef BOOST_FUSION_CONTAINER_MAP_DETAIL_KEY_OF_IMPL_HPP
+#define BOOST_FUSION_CONTAINER_MAP_DETAIL_KEY_OF_IMPL_HPP
+
+#include <boost/fusion/container/map/detail/value_of_impl.hpp>
+
+namespace boost { namespace fusion { namespace extension
+{
+    template <typename>
+    struct key_of_impl;
+
+    template <>
+    struct key_of_impl<map_iterator_tag>
+    {
+        template <typename It>
+        struct apply
+        {
+            typedef typename
+                value_of_impl<map_iterator_tag>::
+                    template apply<It>::type::first_type
+            type;
+        };
+    };
+}}}
+
+#endif
-- 
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