299 lines
9.3 KiB
C++
299 lines
9.3 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2012-2012.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/move for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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//! \file
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#ifndef BOOST_MOVE_ITERATOR_HPP
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#define BOOST_MOVE_ITERATOR_HPP
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#include <boost/move/detail/config_begin.hpp>
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#include <boost/move/utility.hpp>
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#include <iterator> //std::iterator
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namespace boost {
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//////////////////////////////////////////////////////////////////////////////
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//
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// move_iterator
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//
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//////////////////////////////////////////////////////////////////////////////
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//! Class template move_iterator is an iterator adaptor with the same behavior
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//! as the underlying iterator except that its dereference operator implicitly
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//! converts the value returned by the underlying iterator's dereference operator
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//! to an rvalue reference. Some generic algorithms can be called with move
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//! iterators to replace copying with moving.
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template <class It>
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class move_iterator
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{
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public:
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typedef It iterator_type;
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typedef typename std::iterator_traits<iterator_type>::value_type value_type;
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_DOXYGEN_INVOKED)
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typedef value_type && reference;
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#else
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typedef typename ::boost::move_detail::if_
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< ::boost::has_move_emulation_enabled<value_type>
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, ::boost::rv<value_type>&
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, value_type & >::type reference;
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#endif
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typedef It pointer;
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typedef typename std::iterator_traits<iterator_type>::difference_type difference_type;
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typedef typename std::iterator_traits<iterator_type>::iterator_category iterator_category;
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move_iterator()
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{}
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explicit move_iterator(It i)
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: m_it(i)
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{}
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template <class U>
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move_iterator(const move_iterator<U>& u)
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: m_it(u.base())
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{}
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iterator_type base() const
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{ return m_it; }
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reference operator*() const
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{
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
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return *m_it;
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#else
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return ::boost::move(*m_it);
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#endif
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}
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pointer operator->() const
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{ return m_it; }
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move_iterator& operator++()
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{ ++m_it; return *this; }
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move_iterator<iterator_type> operator++(int)
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{ move_iterator<iterator_type> tmp(*this); ++(*this); return tmp; }
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move_iterator& operator--()
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{ --m_it; return *this; }
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move_iterator<iterator_type> operator--(int)
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{ move_iterator<iterator_type> tmp(*this); --(*this); return tmp; }
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move_iterator<iterator_type> operator+ (difference_type n) const
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{ return move_iterator<iterator_type>(m_it + n); }
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move_iterator& operator+=(difference_type n)
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{ m_it += n; return *this; }
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move_iterator<iterator_type> operator- (difference_type n) const
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{ return move_iterator<iterator_type>(m_it - n); }
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move_iterator& operator-=(difference_type n)
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{ m_it -= n; return *this; }
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reference operator[](difference_type n) const
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{
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
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return m_it[n];
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#else
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return ::boost::move(m_it[n]);
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#endif
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}
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friend bool operator==(const move_iterator& x, const move_iterator& y)
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{ return x.base() == y.base(); }
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friend bool operator!=(const move_iterator& x, const move_iterator& y)
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{ return x.base() != y.base(); }
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friend bool operator< (const move_iterator& x, const move_iterator& y)
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{ return x.base() < y.base(); }
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friend bool operator<=(const move_iterator& x, const move_iterator& y)
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{ return x.base() <= y.base(); }
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friend bool operator> (const move_iterator& x, const move_iterator& y)
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{ return x.base() > y.base(); }
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friend bool operator>=(const move_iterator& x, const move_iterator& y)
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{ return x.base() >= y.base(); }
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friend difference_type operator-(const move_iterator& x, const move_iterator& y)
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{ return x.base() - y.base(); }
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friend move_iterator operator+(difference_type n, const move_iterator& x)
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{ return move_iterator(x.base() + n); }
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private:
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It m_it;
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};
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//is_move_iterator
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namespace move_detail {
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template <class I>
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struct is_move_iterator
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: public ::boost::move_detail::integral_constant<bool, false>
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{
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};
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template <class I>
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struct is_move_iterator< ::boost::move_iterator<I> >
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: public ::boost::move_detail::integral_constant<bool, true>
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{
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};
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} //namespace move_detail {
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//////////////////////////////////////////////////////////////////////////////
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//
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// move_iterator
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//
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//////////////////////////////////////////////////////////////////////////////
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//!
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//! <b>Returns</b>: move_iterator<It>(i).
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template<class It>
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inline move_iterator<It> make_move_iterator(const It &it)
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{ return move_iterator<It>(it); }
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//////////////////////////////////////////////////////////////////////////////
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//
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// back_move_insert_iterator
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//
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//////////////////////////////////////////////////////////////////////////////
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//! A move insert iterator that move constructs elements at the
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//! back of a container
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template <typename C> // C models Container
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class back_move_insert_iterator
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: public std::iterator<std::output_iterator_tag, void, void, void, void>
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{
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C* container_m;
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public:
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typedef C container_type;
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typedef typename C::value_type value_type;
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typedef typename C::reference reference;
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explicit back_move_insert_iterator(C& x) : container_m(&x) { }
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back_move_insert_iterator& operator=(reference x)
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{ container_m->push_back(boost::move(x)); return *this; }
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back_move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
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{ reference rx = x; return this->operator=(rx); }
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back_move_insert_iterator& operator*() { return *this; }
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back_move_insert_iterator& operator++() { return *this; }
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back_move_insert_iterator& operator++(int) { return *this; }
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};
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//!
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//! <b>Returns</b>: back_move_insert_iterator<C>(x).
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template <typename C> // C models Container
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inline back_move_insert_iterator<C> back_move_inserter(C& x)
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{
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return back_move_insert_iterator<C>(x);
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// front_move_insert_iterator
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//
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//////////////////////////////////////////////////////////////////////////////
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//! A move insert iterator that move constructs elements int the
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//! front of a container
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template <typename C> // C models Container
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class front_move_insert_iterator
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: public std::iterator<std::output_iterator_tag, void, void, void, void>
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{
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C* container_m;
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public:
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typedef C container_type;
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typedef typename C::value_type value_type;
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typedef typename C::reference reference;
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explicit front_move_insert_iterator(C& x) : container_m(&x) { }
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front_move_insert_iterator& operator=(reference x)
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{ container_m->push_front(boost::move(x)); return *this; }
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front_move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
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{ reference rx = x; return this->operator=(rx); }
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front_move_insert_iterator& operator*() { return *this; }
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front_move_insert_iterator& operator++() { return *this; }
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front_move_insert_iterator& operator++(int) { return *this; }
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};
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//!
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//! <b>Returns</b>: front_move_insert_iterator<C>(x).
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template <typename C> // C models Container
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inline front_move_insert_iterator<C> front_move_inserter(C& x)
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{
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return front_move_insert_iterator<C>(x);
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// insert_move_iterator
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//
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//////////////////////////////////////////////////////////////////////////////
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template <typename C> // C models Container
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class move_insert_iterator
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: public std::iterator<std::output_iterator_tag, void, void, void, void>
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{
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C* container_m;
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typename C::iterator pos_;
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public:
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typedef C container_type;
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typedef typename C::value_type value_type;
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typedef typename C::reference reference;
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explicit move_insert_iterator(C& x, typename C::iterator pos)
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: container_m(&x), pos_(pos)
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{}
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move_insert_iterator& operator=(reference x)
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{
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pos_ = container_m->insert(pos_, ::boost::move(x));
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++pos_;
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return *this;
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}
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move_insert_iterator& operator=(BOOST_RV_REF(value_type) x)
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{ reference rx = x; return this->operator=(rx); }
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move_insert_iterator& operator*() { return *this; }
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move_insert_iterator& operator++() { return *this; }
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move_insert_iterator& operator++(int) { return *this; }
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};
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//!
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//! <b>Returns</b>: move_insert_iterator<C>(x, it).
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template <typename C> // C models Container
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inline move_insert_iterator<C> move_inserter(C& x, typename C::iterator it)
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{
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return move_insert_iterator<C>(x, it);
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}
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} //namespace boost {
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#include <boost/move/detail/config_end.hpp>
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#endif //#ifndef BOOST_MOVE_ITERATOR_HPP
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