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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2005 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(FUSION_CONS_ITERATOR_07172005_0849)
#define FUSION_CONS_ITERATOR_07172005_0849
#include <boost/fusion/support/config.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/fusion/support/iterator_base.hpp>
#include <boost/fusion/container/list/detail/deref_impl.hpp>
#include <boost/fusion/container/list/detail/next_impl.hpp>
#include <boost/fusion/container/list/detail/value_of_impl.hpp>
#include <boost/fusion/container/list/detail/equal_to_impl.hpp>
#include <boost/fusion/container/list/list_fwd.hpp>
namespace boost { namespace fusion
{
struct nil_;
struct cons_iterator_tag;
struct forward_traversal_tag;
template <typename Cons>
struct cons_iterator_identity;
template <typename Cons = nil_>
struct cons_iterator : iterator_base<cons_iterator<Cons> >
{
typedef cons_iterator_tag fusion_tag;
typedef forward_traversal_tag category;
typedef Cons cons_type;
typedef cons_iterator_identity<
typename add_const<Cons>::type>
identity;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit cons_iterator(cons_type& in_cons) BOOST_NOEXCEPT
: cons(in_cons) {}
cons_type& cons;
private:
// silence MSVC warning C4512: assignment operator could not be generated
cons_iterator& operator= (cons_iterator const&);
};
struct nil_iterator : iterator_base<nil_iterator>
{
typedef forward_traversal_tag category;
typedef cons_iterator_tag fusion_tag;
typedef nil_ cons_type;
typedef cons_iterator_identity<
add_const<nil_>::type>
identity;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
nil_iterator() BOOST_NOEXCEPT {}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit nil_iterator(nil_ const&) BOOST_NOEXCEPT {}
};
template <>
struct cons_iterator<nil_> : nil_iterator
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
cons_iterator() BOOST_NOEXCEPT {}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
};
template <>
struct cons_iterator<nil_ const> : nil_iterator
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
cons_iterator() BOOST_NOEXCEPT {}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
};
template <>
struct cons_iterator<list<> > : nil_iterator
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
cons_iterator() BOOST_NOEXCEPT {}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
};
template <>
struct cons_iterator<list<> const> : nil_iterator
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
cons_iterator() BOOST_NOEXCEPT {}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
};
}}
#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
namespace std
{
template <typename Cons>
struct iterator_traits< ::boost::fusion::cons_iterator<Cons> >
{ };
}
#endif
#endif
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