Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 45 insertions, 0 deletions

diff --git a/boost/fusion/container/set/detail/deref_impl.hpp b/boost/fusion/container/set/detail/deref_impl.hpp
new file mode 100644
index 0000000000..10a0349687
--- /dev/null
+++ b/boost/fusion/container/set/detail/deref_impl.hpp
@@ -0,0 +1,45 @@
+/*=============================================================================
+    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_SET_DETAIL_DEREF_IMPL_HPP
+#define BOOST_FUSION_CONTAINER_SET_DETAIL_DEREF_IMPL_HPP
+
+#include <boost/fusion/sequence/intrinsic/at.hpp>
+#include <boost/type_traits/is_const.hpp>
+
+namespace boost { namespace fusion { namespace extension
+{
+    template <typename>
+    struct deref_impl;
+
+    template <>
+    struct deref_impl<set_iterator_tag>
+    {
+        template <typename It>
+        struct apply
+        {
+            typedef typename
+                result_of::at<
+                    typename mpl::if_<
+                        is_const<typename It::seq_type>
+                      , typename It::seq_type::storage_type const
+                      , typename It::seq_type::storage_type
+                    >::type
+                  , typename It::index
+                >::type
+            type;
+
+            static type
+            call(It const& it)
+            {
+                return ::boost::fusion::at<typename It::index>(it.seq->get_data());
+            }
+        };
+    };
+}}}
+
+#endif