ceph/src/boost/libs/move/include/boost/move/iterator.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2012-2012.
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // See http://www.boost.org/libs/move for documentation.
   9 //
  10 //////////////////////////////////////////////////////////////////////////////
  11
  12 //! \file
  13
  14 #ifndef BOOST_MOVE_ITERATOR_HPP
  15 #define BOOST_MOVE_ITERATOR_HPP
  16
  17 #ifndef BOOST_CONFIG_HPP
  18 #  include <boost/config.hpp>
  19 #endif
  20 #
  21 #if defined(BOOST_HAS_PRAGMA_ONCE)
  22 #  pragma once
  23 #endif
  24
  25 #include <boost/move/detail/config_begin.hpp>
  26 #include <boost/move/detail/workaround.hpp>  //forceinline
  27 #include <boost/move/detail/iterator_traits.hpp>
  28 #include <boost/move/utility_core.hpp>
  29
  30 namespace boost {
  31
  32 //////////////////////////////////////////////////////////////////////////////
  33 //
  34 //                            move_iterator
  35 //
  36 //////////////////////////////////////////////////////////////////////////////
  37
  38 //! Class template move_iterator is an iterator adaptor with the same behavior
  39 //! as the underlying iterator except that its dereference operator implicitly
  40 //! converts the value returned by the underlying iterator's dereference operator
  41 //! to an rvalue reference. Some generic algorithms can be called with move
  42 //! iterators to replace copying with moving.
  43 template <class It>
  44 class move_iterator
  45 {
  46    public:
  47    typedef It                                                              iterator_type;
  48    typedef typename boost::movelib::iterator_traits<iterator_type>::value_type        value_type;
  49    #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_DOXYGEN_INVOKED)
  50    typedef value_type &&                                                   reference;
  51    #else
  52    typedef typename ::boost::move_detail::if_
  53       < ::boost::has_move_emulation_enabled<value_type>
  54       , ::boost::rv<value_type>&
  55       , value_type & >::type                                               reference;
  56    #endif
  57    typedef It                                                              pointer;
  58    typedef typename boost::movelib::iterator_traits<iterator_type>::difference_type   difference_type;
  59    typedef typename boost::movelib::iterator_traits<iterator_type>::iterator_category iterator_category;
  60
  61    BOOST_MOVE_FORCEINLINE move_iterator()
  62       : m_it()
  63    {}
  64
  65    BOOST_MOVE_FORCEINLINE explicit move_iterator(const It &i)
  66       :  m_it(i)
  67    {}
  68
  69    template <class U>
  70    BOOST_MOVE_FORCEINLINE move_iterator(const move_iterator<U>& u)
  71       :  m_it(u.m_it)
  72    {}
  73
  74    BOOST_MOVE_FORCEINLINE reference operator*() const
  75    {
  76       #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
  77       return *m_it;
  78       #else
  79       return ::boost::move(*m_it);
  80       #endif
  81    }
  82
  83    BOOST_MOVE_FORCEINLINE pointer   operator->() const
  84    {  return m_it;   }
  85
  86    BOOST_MOVE_FORCEINLINE move_iterator& operator++()
  87    {  ++m_it; return *this;   }
  88
  89    BOOST_MOVE_FORCEINLINE move_iterator<iterator_type>  operator++(int)
  90    {  move_iterator<iterator_type> tmp(*this); ++(*this); return tmp;   }
  91
  92    BOOST_MOVE_FORCEINLINE move_iterator& operator--()
  93    {  --m_it; return *this;   }
  94
  95    BOOST_MOVE_FORCEINLINE move_iterator<iterator_type>  operator--(int)
  96    {  move_iterator<iterator_type> tmp(*this); --(*this); return tmp;   }
  97
  98    move_iterator<iterator_type>  operator+ (difference_type n) const
  99    {  return move_iterator<iterator_type>(m_it + n);  }
 100
 101    BOOST_MOVE_FORCEINLINE move_iterator& operator+=(difference_type n)
 102    {  m_it += n; return *this;   }
 103
 104    BOOST_MOVE_FORCEINLINE move_iterator<iterator_type>  operator- (difference_type n) const
 105    {  return move_iterator<iterator_type>(m_it - n);  }
 106
 107    BOOST_MOVE_FORCEINLINE move_iterator& operator-=(difference_type n)
 108    {  m_it -= n; return *this;   }
 109
 110    BOOST_MOVE_FORCEINLINE reference operator[](difference_type n) const
 111    {
 112       #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
 113       return m_it[n];
 114       #else
 115       return ::boost::move(m_it[n]);
 116       #endif
 117    }
 118
 119    BOOST_MOVE_FORCEINLINE friend bool operator==(const move_iterator& x, const move_iterator& y)
 120    {  return x.m_it == y.m_it;  }
 121
 122    BOOST_MOVE_FORCEINLINE friend bool operator!=(const move_iterator& x, const move_iterator& y)
 123    {  return x.m_it != y.m_it;  }
 124
 125    BOOST_MOVE_FORCEINLINE friend bool operator< (const move_iterator& x, const move_iterator& y)
 126    {  return x.m_it < y.m_it;   }
 127
 128    BOOST_MOVE_FORCEINLINE friend bool operator<=(const move_iterator& x, const move_iterator& y)
 129    {  return x.m_it <= y.m_it;  }
 130
 131    BOOST_MOVE_FORCEINLINE friend bool operator> (const move_iterator& x, const move_iterator& y)
 132    {  return x.m_it > y.m_it;  }
 133
 134    BOOST_MOVE_FORCEINLINE friend bool operator>=(const move_iterator& x, const move_iterator& y)
 135    {  return x.m_it >= y.m_it;  }
 136
 137    BOOST_MOVE_FORCEINLINE friend difference_type operator-(const move_iterator& x, const move_iterator& y)
 138    {  return x.m_it - y.m_it;   }
 139
 140    BOOST_MOVE_FORCEINLINE friend move_iterator operator+(difference_type n, const move_iterator& x)
 141    {  return move_iterator(x.m_it + n);   }
 142
 143    private:
 144    It m_it;
 145 };
 146
 147 //is_move_iterator
 148 namespace move_detail {
 149
 150 template <class I>
 151 struct is_move_iterator
 152 {
 153    static const bool value = false;
 154 };
 155
 156 template <class I>
 157 struct is_move_iterator< ::boost::move_iterator<I> >
 158 {
 159    static const bool value = true;
 160 };
 161
 162 }  //namespace move_detail {
 163
 164 //////////////////////////////////////////////////////////////////////////////
 165 //
 166 //                            move_iterator
 167 //
 168 //////////////////////////////////////////////////////////////////////////////
 169
 170 //!
 171 //! <b>Returns</b>: move_iterator<It>(i).
 172 template<class It>
 173 inline move_iterator<It> make_move_iterator(const It &it)
 174 {  return move_iterator<It>(it); }
 175
 176 //////////////////////////////////////////////////////////////////////////////
 177 //
 178 //                         back_move_insert_iterator
 179 //
 180 //////////////////////////////////////////////////////////////////////////////
 181
 182
 183 //! A move insert iterator that move constructs elements at the
 184 //! back of a container
 185 template <typename C> // C models Container
 186 class back_move_insert_iterator
 187 {
 188    C* container_m;
 189
 190    public:
 191    typedef C                           container_type;
 192    typedef typename C::value_type      value_type;
 193    typedef typename C::reference       reference;
 194    typedef typename C::pointer         pointer;
 195    typedef typename C::difference_type difference_type;
 196    typedef std::output_iterator_tag    iterator_category;
 197
 198    explicit back_move_insert_iterator(C& x) : container_m(&x) { }
 199
 200    back_move_insert_iterator& operator=(reference x)
 201    { container_m->push_back(boost::move(x)); return *this; }
 202
 203    back_move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
 204    {  reference rx = x; return this->operator=(rx);  }
 205
 206    back_move_insert_iterator& operator*()     { return *this; }
 207    back_move_insert_iterator& operator++()    { return *this; }
 208    back_move_insert_iterator& operator++(int) { return *this; }
 209 };
 210
 211 //!
 212 //! <b>Returns</b>: back_move_insert_iterator<C>(x).
 213 template <typename C> // C models Container
 214 inline back_move_insert_iterator<C> back_move_inserter(C& x)
 215 {
 216    return back_move_insert_iterator<C>(x);
 217 }
 218
 219 //////////////////////////////////////////////////////////////////////////////
 220 //
 221 //                         front_move_insert_iterator
 222 //
 223 //////////////////////////////////////////////////////////////////////////////
 224
 225 //! A move insert iterator that move constructs elements int the
 226 //! front of a container
 227 template <typename C> // C models Container
 228 class front_move_insert_iterator
 229 {
 230    C* container_m;
 231
 232 public:
 233    typedef C                           container_type;
 234    typedef typename C::value_type      value_type;
 235    typedef typename C::reference       reference;
 236    typedef typename C::pointer         pointer;
 237    typedef typename C::difference_type difference_type;
 238    typedef std::output_iterator_tag    iterator_category;
 239
 240    explicit front_move_insert_iterator(C& x) : container_m(&x) { }
 241
 242    front_move_insert_iterator& operator=(reference x)
 243    { container_m->push_front(boost::move(x)); return *this; }
 244
 245    front_move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
 246    {  reference rx = x; return this->operator=(rx);  }
 247
 248    front_move_insert_iterator& operator*()     { return *this; }
 249    front_move_insert_iterator& operator++()    { return *this; }
 250    front_move_insert_iterator& operator++(int) { return *this; }
 251 };
 252
 253 //!
 254 //! <b>Returns</b>: front_move_insert_iterator<C>(x).
 255 template <typename C> // C models Container
 256 inline front_move_insert_iterator<C> front_move_inserter(C& x)
 257 {
 258    return front_move_insert_iterator<C>(x);
 259 }
 260
 261 //////////////////////////////////////////////////////////////////////////////
 262 //
 263 //                         insert_move_iterator
 264 //
 265 //////////////////////////////////////////////////////////////////////////////
 266 template <typename C> // C models Container
 267 class move_insert_iterator
 268 {
 269    C* container_m;
 270    typename C::iterator pos_;
 271
 272    public:
 273    typedef C                           container_type;
 274    typedef typename C::value_type      value_type;
 275    typedef typename C::reference       reference;
 276    typedef typename C::pointer         pointer;
 277    typedef typename C::difference_type difference_type;
 278    typedef std::output_iterator_tag    iterator_category;
 279
 280    explicit move_insert_iterator(C& x, typename C::iterator pos)
 281       : container_m(&x), pos_(pos)
 282    {}
 283
 284    move_insert_iterator& operator=(reference x)
 285    {
 286       pos_ = container_m->insert(pos_, ::boost::move(x));
 287       ++pos_;
 288       return *this;
 289    }
 290
 291    move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
 292    {  reference rx = x; return this->operator=(rx);  }
 293
 294    move_insert_iterator& operator*()     { return *this; }
 295    move_insert_iterator& operator++()    { return *this; }
 296    move_insert_iterator& operator++(int) { return *this; }
 297 };
 298
 299 //!
 300 //! <b>Returns</b>: move_insert_iterator<C>(x, it).
 301 template <typename C> // C models Container
 302 inline move_insert_iterator<C> move_inserter(C& x, typename C::iterator it)
 303 {
 304    return move_insert_iterator<C>(x, it);
 305 }
 306
 307 }  //namespace boost {
 308
 309 #include <boost/move/detail/config_end.hpp>
 310
 311 #endif //#ifndef BOOST_MOVE_ITERATOR_HPP