Updated boost to v1.55.0

[rsem.git] / boost / fusion / algorithm / transformation / push_front.hpp

diff --git a/boost/fusion/algorithm/transformation/push_front.hpp b/boost/fusion/algorithm/transformation/push_front.hpp
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+++ b/boost/fusion/algorithm/transformation/push_front.hpp
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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+
+    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)
+==============================================================================*/
+#if !defined(FUSION_PUSH_FRONT_07162005_0749)
+#define FUSION_PUSH_FRONT_07162005_0749
+
+#include <boost/fusion/support/detail/as_fusion_element.hpp>
+#include <boost/fusion/view/joint_view/joint_view.hpp>
+#include <boost/fusion/view/single_view/single_view.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/utility/enable_if.hpp>
+
+namespace boost { namespace fusion
+{
+    namespace result_of
+    {
+        template <typename Sequence, typename T>
+        struct push_front
+        {
+            typedef fusion::single_view<typename detail::as_fusion_element<T>::type> single_view;
+            typedef joint_view<single_view const, Sequence> type;
+        };
+    }
+
+    template <typename Sequence, typename T>
+    inline 
+    typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::push_front<Sequence const, T>
+        >::type
+    push_front(Sequence const& seq, T const& x)
+    {
+        typedef typename result_of::push_front<Sequence const, T> push_front;
+        typedef typename push_front::single_view single_view; 
+        typedef typename push_front::type result; 
+        single_view x_(x);
+        return result(x_, seq);
+    }
+}}
+
+#endif
+