intrusive/detail/slist_iterator.hpp

0001 /////////////////////////////////////////////////////////////////////////////
0002 //
0003 // (C) Copyright Olaf Krzikalla 2004-2006.
0004 // (C) Copyright Ion Gaztanaga  2006-2013
0005 //
0006 // Distributed under the Boost Software License, Version 1.0.
0007 //    (See accompanying file LICENSE_1_0.txt or copy at
0008 //          http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010 // See http://www.boost.org/libs/intrusive for documentation.
0011 //
0012 /////////////////////////////////////////////////////////////////////////////
0013
0014 #ifndef BOOST_INTRUSIVE_SLIST_ITERATOR_HPP
0015 #define BOOST_INTRUSIVE_SLIST_ITERATOR_HPP
0016
0017 #ifndef BOOST_CONFIG_HPP
0018 #  include <boost/config.hpp>
0019 #endif
0020
0021 #if defined(BOOST_HAS_PRAGMA_ONCE)
0022 #  pragma once
0023 #endif
0024
0025 #include <boost/intrusive/detail/config_begin.hpp>
0026 #include <boost/intrusive/detail/workaround.hpp>
0027 #include <boost/intrusive/detail/std_fwd.hpp>
0028 #include <boost/intrusive/detail/iiterator.hpp>
0029 #include <boost/intrusive/detail/mpl.hpp>
0030
0031 namespace boost {
0032 namespace intrusive {
0033
0034
0035 // slist_iterator provides some basic functions for a
0036 // node oriented bidirectional iterator:
0037 template<class ValueTraits, bool IsConst>
0038 class slist_iterator
0039 {
0040    private:
0041    typedef iiterator
0042       <ValueTraits, IsConst, std::forward_iterator_tag> types_t;
0043
0044    static const bool stateful_value_traits =                types_t::stateful_value_traits;
0045
0046    typedef ValueTraits                                      value_traits;
0047    typedef typename types_t::node_traits                    node_traits;
0048
0049    typedef typename types_t::node                           node;
0050    typedef typename types_t::node_ptr                       node_ptr;
0051    typedef typename types_t::const_value_traits_ptr         const_value_traits_ptr;
0052    class nat;
0053    typedef typename
0054       detail::if_c< IsConst
0055                   , slist_iterator<value_traits, false>
0056                   , nat>::type                              nonconst_iterator;
0057
0058    public:
0059    typedef typename types_t::iterator_type::difference_type    difference_type;
0060    typedef typename types_t::iterator_type::value_type         value_type;
0061    typedef typename types_t::iterator_type::pointer            pointer;
0062    typedef typename types_t::iterator_type::reference          reference;
0063    typedef typename types_t::iterator_type::iterator_category  iterator_category;
0064
0065    inline slist_iterator()
0066    {}
0067
0068    inline slist_iterator(node_ptr nodeptr, const_value_traits_ptr traits_ptr)
0069       : members_(nodeptr, traits_ptr)
0070    {}
0071
0072    inline explicit slist_iterator(node_ptr nodeptr)
0073       : members_(nodeptr, const_value_traits_ptr())
0074    {  BOOST_INTRUSIVE_STATIC_ASSERT((stateful_value_traits == false));  }
0075
0076    inline slist_iterator(const slist_iterator &other)
0077       :  members_(other.pointed_node(), other.get_value_traits())
0078    {}
0079
0080    inline slist_iterator(const nonconst_iterator &other)
0081       :  members_(other.pointed_node(), other.get_value_traits())
0082    {}
0083
0084    inline slist_iterator &operator=(const slist_iterator &other)
0085    {  members_.nodeptr_ = other.members_.nodeptr_;  return *this;  }
0086
0087    inline node_ptr pointed_node() const
0088    { return members_.nodeptr_; }
0089
0090    inline slist_iterator &operator=(node_ptr n)
0091    {  members_.nodeptr_ = n;  return static_cast<slist_iterator&>(*this);  }
0092
0093    inline const_value_traits_ptr get_value_traits() const
0094    {  return members_.get_ptr(); }
0095
0096    inline bool operator!() const
0097    {  return !members_.nodeptr_; }
0098
0099    public:
0100    inline slist_iterator& operator++()
0101    {
0102       members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
0103       return static_cast<slist_iterator&> (*this);
0104    }
0105
0106    inline slist_iterator operator++(int)
0107    {
0108       slist_iterator result (*this);
0109       members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
0110       return result;
0111    }
0112
0113    inline friend bool operator== (const slist_iterator& l, const slist_iterator& r)
0114    {  return l.pointed_node() == r.pointed_node();   }
0115
0116    inline friend bool operator!= (const slist_iterator& l, const slist_iterator& r)
0117    {  return l.pointed_node() != r.pointed_node();   }
0118
0119    inline reference operator*() const
0120    {  return *operator->();   }
0121
0122    inline pointer operator->() const
0123    { return this->operator_arrow(detail::bool_<stateful_value_traits>()); }
0124
0125    inline slist_iterator<ValueTraits, false> unconst() const
0126    {  return slist_iterator<ValueTraits, false>(this->pointed_node(), this->get_value_traits());   }
0127
0128    private:
0129
0130    inline pointer operator_arrow(detail::false_) const
0131    { return ValueTraits::to_value_ptr(members_.nodeptr_); }
0132
0133    inline pointer operator_arrow(detail::true_) const
0134    { return this->get_value_traits()->to_value_ptr(members_.nodeptr_); }
0135
0136    iiterator_members<node_ptr, const_value_traits_ptr, stateful_value_traits> members_;
0137 };
0138
0139 } //namespace intrusive
0140 } //namespace boost
0141
0142 #include <boost/intrusive/detail/config_end.hpp>
0143
0144 #endif //BOOST_INTRUSIVE_SLIST_ITERATOR_HPP