ceph/src/boost/libs/spirit/include/boost/spirit/home/support/iterators/multi_pass.hpp

   1 //  Copyright (c) 2001, Daniel C. Nuffer
   2 //  Copyright (c) 2001-2011 Hartmut Kaiser
   3 //  http://spirit.sourceforge.net/
   4 //
   5 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   6 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #if !defined(BOOST_SPIRIT_ITERATOR_MULTI_PASS_MAR_16_2007_1124AM)
   9 #define BOOST_SPIRIT_ITERATOR_MULTI_PASS_MAR_16_2007_1124AM
  10
  11 #include <boost/config.hpp>
  12 #include <boost/spirit/home/support/iterators/multi_pass_fwd.hpp>
  13 #include <boost/spirit/home/support/iterators/detail/multi_pass.hpp>
  14 #include <boost/spirit/home/support/iterators/detail/combine_policies.hpp>
  15 #include <boost/limits.hpp>
  16 #include <boost/detail/workaround.hpp>
  17 #include <boost/utility/base_from_member.hpp>
  18
  19 namespace boost { namespace spirit
  20 {
  21     ///////////////////////////////////////////////////////////////////////////
  22     // The default multi_pass instantiation uses a ref-counted std_deque scheme.
  23     ///////////////////////////////////////////////////////////////////////////
  24     template<typename T, typename Policies>
  25     class multi_pass
  26       : private boost::base_from_member<
  27             typename Policies::BOOST_NESTED_TEMPLATE shared<T>*>
  28       , public Policies::BOOST_NESTED_TEMPLATE unique<T>
  29     {
  30     private:
  31         // unique and shared data types
  32         typedef typename Policies::BOOST_NESTED_TEMPLATE unique<T>
  33             policies_base_type;
  34         typedef typename Policies::BOOST_NESTED_TEMPLATE shared<T>
  35             shared_data_type;
  36
  37         typedef boost::base_from_member<shared_data_type*> member_base;
  38
  39         // define the types the standard embedded iterator typedefs are taken
  40         // from
  41         typedef typename policies_base_type::input_policy iterator_type;
  42
  43     public:
  44         // standard iterator typedefs
  45         typedef std::forward_iterator_tag iterator_category;
  46         typedef typename iterator_type::value_type value_type;
  47         typedef typename iterator_type::difference_type difference_type;
  48         typedef typename iterator_type::distance_type distance_type;
  49         typedef typename iterator_type::reference reference;
  50         typedef typename iterator_type::pointer pointer;
  51
  52         multi_pass() : member_base(static_cast<shared_data_type*>(0)) {}
  53
  54         explicit multi_pass(T& input)
  55           : member_base(new shared_data_type(input)), policies_base_type(input) {}
  56
  57         explicit multi_pass(T const& input)
  58           : member_base(new shared_data_type(input)), policies_base_type(input) {}
  59
  60         multi_pass(multi_pass const& x)
  61           : member_base(x.member), policies_base_type(x)
  62         {
  63             policies_base_type::clone(*this);
  64         }
  65
  66 #if BOOST_WORKAROUND(__GLIBCPP__, == 20020514)
  67         // The standard library shipped with gcc-3.1 has a bug in
  68         // bits/basic_string.tcc. It tries to use iter::iter(0) to
  69         // construct an iterator. Ironically, this  happens in sanity
  70         // checking code that isn't required by the standard.
  71         // The workaround is to provide an additional constructor that
  72         // ignores its int argument and behaves like the default constructor.
  73         multi_pass(int) : member_base(static_cast<shared_data_type*>(0)) {}
  74 #endif // BOOST_WORKAROUND(__GLIBCPP__, == 20020514)
  75
  76         ~multi_pass()
  77         {
  78             if (policies_base_type::release(*this)) {
  79                 policies_base_type::destroy(*this);
  80                 delete this->member;
  81             }
  82         }
  83
  84         multi_pass& operator=(multi_pass const& x)
  85         {
  86             if (this != &x) {
  87                 multi_pass temp(x);
  88                 temp.swap(*this);
  89             }
  90             return *this;
  91         }
  92
  93         void swap(multi_pass& x)
  94         {
  95             boost::swap(this->member, x.member);
  96             this->policies_base_type::swap(x);
  97         }
  98
  99         reference operator*() const
 100         {
 101             policies_base_type::docheck(*this);
 102             return policies_base_type::dereference(*this);
 103         }
 104         pointer operator->() const
 105         {
 106             return &(operator*());
 107         }
 108
 109         multi_pass& operator++()
 110         {
 111             policies_base_type::docheck(*this);
 112             policies_base_type::increment(*this);
 113             return *this;
 114         }
 115         multi_pass operator++(int)
 116         {
 117             multi_pass tmp(*this);
 118             ++*this;
 119             return tmp;
 120         }
 121
 122         void clear_queue(BOOST_SCOPED_ENUM(traits::clear_mode) mode =
 123             traits::clear_mode::clear_if_enabled)
 124         {
 125             if (mode == traits::clear_mode::clear_always || !inhibit_clear_queue())
 126                 policies_base_type::clear_queue(*this);
 127         }
 128         bool inhibit_clear_queue() const
 129         {
 130             return this->member->inhibit_clear_queue_;
 131         }
 132         void inhibit_clear_queue(bool flag)
 133         {
 134             this->member->inhibit_clear_queue_ = flag;
 135         }
 136
 137         bool operator==(multi_pass const& y) const
 138         {
 139             if (is_eof())
 140                 return y.is_eof();
 141             if (y.is_eof())
 142                 return false;
 143
 144             return policies_base_type::equal_to(*this, y);
 145         }
 146         bool operator<(multi_pass const& y) const
 147         {
 148             return policies_base_type::less_than(*this, y);
 149         }
 150
 151         bool operator!=(multi_pass const& y)
 152         {
 153             return !(*this == y);
 154         }
 155         bool operator>(multi_pass const& y)
 156         {
 157             return y < *this;
 158         }
 159         bool operator>=(multi_pass const& y)
 160         {
 161             return !(*this < y);
 162         }
 163         bool operator<=(multi_pass const& y)
 164         {
 165             return !(y < *this);
 166         }
 167
 168         // allow access to base member
 169         shared_data_type* shared() const { return this->member; }
 170
 171     private: // helper functions
 172         bool is_eof() const
 173         {
 174             return (0 == this->member) || policies_base_type::is_eof(*this);
 175         }
 176     };
 177
 178     ///////////////////////////////////////////////////////////////////////////
 179     //  Generator function
 180     ///////////////////////////////////////////////////////////////////////////
 181     template <typename Policies, typename T>
 182     inline multi_pass<T, Policies>
 183     make_multi_pass(T& i)
 184     {
 185         return multi_pass<T, Policies>(i);
 186     }
 187     template <typename Policies, typename T>
 188     inline multi_pass<T, Policies>
 189     make_multi_pass(T const& i)
 190     {
 191         return multi_pass<T, Policies>(i);
 192     }
 193
 194     ///////////////////////////////////////////////////////////////////////////
 195     template <typename T>
 196     inline multi_pass<T>
 197     make_default_multi_pass(T& i)
 198     {
 199         return multi_pass<T>(i);
 200     }
 201     template <typename T>
 202     inline multi_pass<T>
 203     make_default_multi_pass(T const& i)
 204     {
 205         return multi_pass<T>(i);
 206     }
 207
 208     ///////////////////////////////////////////////////////////////////////////
 209     template <typename T, typename Policies>
 210     inline void
 211     swap(multi_pass<T, Policies> &x, multi_pass<T, Policies> &y)
 212     {
 213         x.swap(y);
 214     }
 215
 216     ///////////////////////////////////////////////////////////////////////////
 217     // define special functions allowing to integrate any multi_pass iterator
 218     // with expectation points
 219     namespace traits
 220     {
 221         template <typename T, typename Policies>
 222         void clear_queue(multi_pass<T, Policies>& mp
 223           , BOOST_SCOPED_ENUM(traits::clear_mode) mode)
 224         {
 225             mp.clear_queue(mode);
 226         }
 227
 228         template <typename T, typename Policies>
 229         void inhibit_clear_queue(multi_pass<T, Policies>& mp, bool flag)
 230         {
 231             mp.inhibit_clear_queue(flag);
 232         }
 233
 234         template <typename T, typename Policies>
 235         bool inhibit_clear_queue(multi_pass<T, Policies>& mp)
 236         {
 237             return mp.inhibit_clear_queue();
 238         }
 239     }
 240
 241 }} // namespace boost::spirit
 242
 243 #endif
 244
 245