Added boost header

test/external/boost/proto/functional/fusion/push_front.hpp

@@ -0,0 +1,49 @@
+///////////////////////////////////////////////////////////////////////////////
+/// \file push_front.hpp
+/// Proto callables Fusion push_front
+//
+//  Copyright 2010 Eric Niebler. 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_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
+#define BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
+
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/fusion/include/push_front.hpp>
+#include <boost/proto/proto_fwd.hpp>
+
+namespace boost { namespace proto { namespace functional
+{
+    /// \brief A PolymorphicFunctionObject type that invokes the
+    /// \c fusion::push_front() algorithm on its argument.
+    ///
+    /// A PolymorphicFunctionObject type that invokes the
+    /// \c fusion::push_front() algorithm on its argument.
+    struct push_front
+    {
+        BOOST_PROTO_CALLABLE()
+
+        template<typename Sig>
+        struct result;
+
+        template<typename This, typename Seq, typename T>
+        struct result<This(Seq, T)>
+          : fusion::result_of::push_front<
+                typename boost::add_const<typename boost::remove_reference<Seq>::type>::type
+              , typename boost::remove_const<typename boost::remove_reference<T>::type>::type
+            >
+        {};
+
+        template<typename Seq, typename T>
+        typename fusion::result_of::push_front<Seq const, T>::type
+        operator ()(Seq const &seq, T const &t) const
+        {
+            return fusion::push_front(seq, t);
+        }
+    };
+}}}
+
+#endif