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/*=============================================================================
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_SIZE_05052005_0214)
#define FUSION_SIZE_05052005_0214
#include <boost/utility/enable_if.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/int.hpp>
#include <boost/fusion/sequence/intrinsic_fwd.hpp>
#include <boost/fusion/support/tag_of.hpp>
#include <boost/fusion/support/is_segmented.hpp>
#include <boost/fusion/sequence/intrinsic/detail/segmented_size.hpp>
namespace boost { namespace fusion
{
// Special tags:
struct sequence_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 size_impl
{
template<typename Sequence>
struct unsegmented_size : Sequence::size {};
template <typename Sequence>
struct apply
: mpl::if_<
traits::is_segmented<Sequence>
, detail::segmented_size<Sequence>
, unsegmented_size<Sequence>
>::type
{};
};
template <>
struct size_impl<sequence_facade_tag>
{
template <typename Sequence>
struct apply : Sequence::template size<Sequence> {};
};
template <>
struct size_impl<boost_tuple_tag>;
template <>
struct size_impl<boost_array_tag>;
template <>
struct size_impl<mpl_sequence_tag>;
template <>
struct size_impl<std_pair_tag>;
}
namespace result_of
{
template <typename Sequence>
struct size
: extension::size_impl<typename detail::tag_of<Sequence>::type>::
template apply<Sequence>
{
typedef typename extension::size_impl<typename detail::tag_of<Sequence>::type>::
template apply<Sequence>::type size_application;
BOOST_STATIC_CONSTANT(int, value = size_application::value);
};
}
template <typename Sequence>
inline typename result_of::size<Sequence>::type
size(Sequence const&)
{
typedef typename result_of::size<Sequence>::type result;
return result();
}
}}
#endif
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