From 1a78a62555be32868418fe52f8e330c9d0f95d5a Mon Sep 17 00:00:00 2001
From: Anas Nashif <anas.nashif@intel.com>
Date: Tue, 30 Oct 2012 12:57:26 -0700
Subject: Imported Upstream version 1.49.0

---
 boost/fusion/sequence/intrinsic/begin.hpp | 95 +++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 boost/fusion/sequence/intrinsic/begin.hpp

(limited to 'boost/fusion/sequence/intrinsic/begin.hpp')

diff --git a/boost/fusion/sequence/intrinsic/begin.hpp b/boost/fusion/sequence/intrinsic/begin.hpp
new file mode 100644
index 0000000000..7a7ecf6afd
--- /dev/null
+++ b/boost/fusion/sequence/intrinsic/begin.hpp
@@ -0,0 +1,95 @@
+/*=============================================================================
+    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_BEGIN_04052005_1132)
+#define FUSION_BEGIN_04052005_1132
+
+#include <boost/blank.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/fusion/support/is_segmented.hpp>
+#include <boost/fusion/sequence/intrinsic/detail/segmented_begin.hpp>
+
+namespace boost { namespace fusion
+{
+    // Special tags:
+    struct sequence_facade_tag; // iterator facade tag
+    struct boost_tuple_tag; // boost::tuples::tuple tag
+    struct boost_array_tag; // boost::array tag
+    struct mpl_sequence_tag; // mpl sequence tag
+    struct std_pair_tag; // std::pair tag
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct begin_impl
+        {
+            template <typename Sequence>
+            struct apply
+              : mpl::if_<
+                    traits::is_segmented<Sequence>
+                  , detail::segmented_begin<Sequence>
+                  , blank
+                >::type
+            {};
+        };
+
+        template <>
+        struct begin_impl<sequence_facade_tag>
+        {
+            template <typename Sequence>
+            struct apply : Sequence::template begin<Sequence> {};
+        };
+
+        template <>
+        struct begin_impl<boost_tuple_tag>;
+
+        template <>
+        struct begin_impl<boost_array_tag>;
+
+        template <>
+        struct begin_impl<mpl_sequence_tag>;
+
+        template <>
+        struct begin_impl<std_pair_tag>;
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct begin
+            : extension::begin_impl<typename detail::tag_of<Sequence>::type>::
+                template apply<Sequence>
+        {};
+    }
+
+    template <typename Sequence>
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::begin<Sequence>
+        >::type const
+    begin(Sequence& seq)
+    {
+        return result_of::begin<Sequence>::call(seq);
+    }
+
+    template <typename Sequence>
+    inline typename
+        lazy_enable_if<
+            traits::is_sequence<Sequence>
+          , result_of::begin<Sequence const>
+        >::type const
+    begin(Sequence const& seq)
+    {
+        return result_of::begin<Sequence const>::call(seq);
+    }
+}}
+
+#endif
-- 
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