Updated boost to v1.55.0

[rsem.git] / boost / fusion / view / single_view / detail / at_impl.hpp

diff --git a/boost/fusion/view/single_view/detail/at_impl.hpp b/boost/fusion/view/single_view/detail/at_impl.hpp
new file mode 100644 (file)
index 0000000..3e0915f
--- /dev/null
+++ b/boost/fusion/view/single_view/detail/at_impl.hpp
@@ -0,0 +1,44 @@
+/*=============================================================================
+    Copyright (c) 2011 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(BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM)
+#define BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM
+
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/equal_to.hpp>
+
+namespace boost { namespace fusion 
+{
+    struct single_view_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct at_impl;
+
+        template<>
+        struct at_impl<single_view_tag>
+        {
+            template<typename Sequence, typename N>
+            struct apply
+            {
+                BOOST_MPL_ASSERT((mpl::equal_to<N, mpl::int_<0> >));
+                typedef typename Sequence::value_type type;
+
+                static type 
+                call(Sequence& seq)
+                {
+                    return seq.val;
+                }
+            };
+        };
+    }
+
+}}
+
+#endif