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.svn/pristine/80/80dec69ffb6ac8fba6d1a62e5aea799cbdb7c2ba.svn-base

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+/*=============================================================================
+    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_SEGMENTED_SIZE_08112006_1141)
+#define BOOST_FUSION_SEGMENTED_SIZE_08112006_1141
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/plus.hpp>
+#include <boost/mpl/size_t.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/mpl/begin.hpp>
+#include <boost/fusion/mpl/end.hpp>
+#include <boost/fusion/support/is_segmented.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+    ///////////////////////////////////////////////////////////////////////////
+    // calculates the size of any segmented data structure.
+    template<typename Sequence>
+    struct segmented_size;
+
+    ///////////////////////////////////////////////////////////////////////////
+    template<typename Sequence, bool IsSegmented = traits::is_segmented<Sequence>::value>
+    struct segmented_size_impl
+      : mpl::fold<
+            typename remove_reference<
+                typename add_const<
+                    typename result_of::segments<Sequence>::type
+                >::type
+            >::type
+          , mpl::size_t<0>
+          , mpl::plus<mpl::_1, segmented_size<remove_reference<mpl::_2> > >
+        >::type
+    {};
+
+    template<typename Sequence>
+    struct segmented_size_impl<Sequence, false>
+      : result_of::size<Sequence>::type
+    {};
+
+    template<typename Sequence>
+    struct segmented_size
+      : segmented_size_impl<Sequence>
+    {};
+
+}}}
+
+#endif