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[SVN r40234]
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Joel de Guzman
2007-10-21 00:47:59 +00:00
parent fc57a566cb
commit 7a6e82b7cf
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include/boost/fusion/iterator/advance.hpp
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/*=============================================================================
Copyright (c) 2001-2006 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_ADVANCE_09172005_1146)
#define FUSION_ADVANCE_09172005_1146
#include <boost/fusion/iterator/detail/advance.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/fusion/support/tag_of.hpp>
namespace boost { namespace fusion
{
struct random_access_traversal_tag;
// Special tags:
struct iterator_facade_tag; // iterator facade tag
struct array_iterator_tag; // boost::array iterator tag
struct mpl_iterator_tag; // mpl sequence iterator tag
struct std_pair_iterator_tag; // std::pair iterator tag
namespace extension
{
template <typename Tag>
struct advance_impl
{
// default implementation
template <typename Iterator, typename N>
struct apply :
mpl::if_c<
(N::value > 0)
, advance_detail::forward<Iterator, N::value>
, advance_detail::backward<Iterator, N::value>
>::type
{
BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>));
};
};
template <>
struct advance_impl<iterator_facade_tag>
{
template <typename Iterator, typename N>
struct apply : Iterator::template advance<Iterator, N> {};
};
template <>
struct advance_impl<array_iterator_tag>;
template <>
struct advance_impl<mpl_iterator_tag>;
template <>
struct advance_impl<std_pair_iterator_tag>;
}
namespace result_of
{
template <typename Iterator, int N>
struct advance_c
: extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, mpl::int_<N> >
{};
template <typename Iterator, typename N>
struct advance
: extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, N>
{};
}
template <int N, typename Iterator>
inline typename result_of::advance_c<Iterator, N>::type const
advance_c(Iterator const& i)
{
return result_of::advance_c<Iterator, N>::call(i);
}
template<typename N, typename Iterator>
inline typename result_of::advance<Iterator, N>::type const
advance(Iterator const& i)
{
return result_of::advance<Iterator, N>::call(i);
}
}} // namespace boost::fusion
#endif