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111 lines
3.5 KiB
111 lines
3.5 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005 Eric Niebler
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_CONS_ITERATOR_07172005_0849)
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#define FUSION_CONS_ITERATOR_07172005_0849
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#include <boost/fusion/support/config.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/fusion/support/iterator_base.hpp>
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#include <boost/fusion/container/list/detail/deref_impl.hpp>
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#include <boost/fusion/container/list/detail/next_impl.hpp>
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#include <boost/fusion/container/list/detail/value_of_impl.hpp>
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#include <boost/fusion/container/list/detail/equal_to_impl.hpp>
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#include <boost/fusion/container/list/list_fwd.hpp>
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namespace boost { namespace fusion
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{
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struct nil_;
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struct cons_iterator_tag;
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struct forward_traversal_tag;
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template <typename Cons>
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struct cons_iterator_identity;
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template <typename Cons = nil_>
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struct cons_iterator : iterator_base<cons_iterator<Cons> >
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{
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typedef cons_iterator_tag fusion_tag;
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typedef forward_traversal_tag category;
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typedef Cons cons_type;
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typedef cons_iterator_identity<
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typename add_const<Cons>::type>
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identity;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit cons_iterator(cons_type& in_cons) BOOST_NOEXCEPT
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: cons(in_cons) {}
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cons_type& cons;
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// silence MSVC warning C4512: assignment operator could not be generated
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BOOST_DELETED_FUNCTION(cons_iterator& operator= (cons_iterator const&))
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};
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struct nil_iterator : iterator_base<nil_iterator>
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{
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typedef forward_traversal_tag category;
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typedef cons_iterator_tag fusion_tag;
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typedef nil_ cons_type;
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typedef cons_iterator_identity<
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add_const<nil_>::type>
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identity;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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nil_iterator() BOOST_NOEXCEPT {}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit nil_iterator(nil_ const&) BOOST_NOEXCEPT {}
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};
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template <>
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struct cons_iterator<nil_> : nil_iterator
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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cons_iterator() BOOST_NOEXCEPT {}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
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};
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template <>
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struct cons_iterator<nil_ const> : nil_iterator
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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cons_iterator() BOOST_NOEXCEPT {}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
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};
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template <>
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struct cons_iterator<list<> > : nil_iterator
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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cons_iterator() BOOST_NOEXCEPT {}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
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};
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template <>
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struct cons_iterator<list<> const> : nil_iterator
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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cons_iterator() BOOST_NOEXCEPT {}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {}
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};
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}}
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#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
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namespace std
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{
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template <typename Cons>
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struct iterator_traits< ::boost::fusion::cons_iterator<Cons> >
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{ };
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}
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#endif
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#endif
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