Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2005 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)
+==============================================================================*/
+#if !defined(FUSION_DEREF_IMPL_07172005_0831)
+#define FUSION_DEREF_IMPL_07172005_0831
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/add_reference.hpp>
+
+namespace boost { namespace fusion
+{
+    struct cons_iterator_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct deref_impl;
+
+        template <>
+        struct deref_impl<cons_iterator_tag>
+        {
+            template <typename Iterator>
+            struct apply
+            {
+                typedef typename Iterator::cons_type cons_type;
+                typedef typename cons_type::car_type value_type;
+
+                typedef typename mpl::eval_if<
+                    is_const<cons_type>
+                  , add_reference<typename add_const<value_type>::type>
+                  , add_reference<value_type> >::type
+                type;
+
+                BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+                static type
+                call(Iterator const& i)
+                {
+                    return i.cons.car;
+                }
+            };
+        };
+    }
+}}
+
+#endif
+
+