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) 2006 Dan Marsden
+
+    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_VALUE_OF_IMPL_20060124_2147)
+#define FUSION_VALUE_OF_IMPL_20060124_2147
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/container/vector/convert.hpp>
+#include <boost/fusion/algorithm/transformation/transform.hpp>
+#include <boost/fusion/iterator/value_of.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/fusion/support/unused.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/config.hpp>
+
+namespace boost { namespace fusion
+{
+    struct zip_view_iterator_tag;
+
+    namespace detail
+    {
+        struct poly_value_of
+        {
+            template<typename T>
+            struct result;
+
+            template<typename It>
+            struct result<poly_value_of(It)>
+                : mpl::eval_if<is_same<It, unused_type>,
+                               mpl::identity<unused_type>,
+                               result_of::value_of<It> >
+            {};
+
+            // never called, but needed for decltype-based result_of (C++0x)
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+            template<typename It>
+            BOOST_FUSION_GPU_ENABLED
+            typename result<poly_value_of(It)>::type
+            operator()(It&&) const;
+#endif
+        };
+    }
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct value_of_impl;
+
+        template<>
+        struct value_of_impl<zip_view_iterator_tag>
+        {
+            template<typename Iterator>
+            struct apply
+            {
+                typedef typename result_of::transform<
+                    typename Iterator::iterators,
+                    detail::poly_value_of>::type values;
+
+                typedef typename result_of::as_vector<values>::type type;
+            };
+        };
+    }
+}}
+
+#endif