/*=============================================================================
- Copyright (c) 2001-2006 Joel de Guzman
+ 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
{
struct begin_impl
{
template <typename Sequence>
- struct apply;
+ struct apply
+ : mpl::if_<
+ traits::is_segmented<Sequence>
+ , detail::segmented_begin<Sequence>
+ , blank
+ >::type
+ {};
};
template <>
}
template <typename Sequence>
- inline typename result_of::begin<Sequence>::type const
+ 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 result_of::begin<Sequence const>::type const
+ 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);