/////////////////////////////////////////////////////////////////////////////
|
//
|
// (C) Copyright Ion Gaztanaga 2014-2014
|
//
|
// Distributed under the Boost Software License, Version 1.0.
|
// (See accompanying file LICENSE_1_0.txt or copy at
|
// http://www.boost.org/LICENSE_1_0.txt)
|
//
|
// See http://www.boost.org/libs/move for documentation.
|
//
|
/////////////////////////////////////////////////////////////////////////////
|
|
#ifndef BOOST_MOVE_DETAIL_REVERSE_ITERATOR_HPP
|
#define BOOST_MOVE_DETAIL_REVERSE_ITERATOR_HPP
|
|
#ifndef BOOST_CONFIG_HPP
|
# include <boost/config.hpp>
|
#endif
|
|
#if defined(BOOST_HAS_PRAGMA_ONCE)
|
# pragma once
|
#endif
|
|
#include <boost/move/detail/config_begin.hpp>
|
#include <boost/move/detail/iterator_traits.hpp>
|
#include <boost/move/detail/meta_utils.hpp>
|
|
namespace boost {
|
namespace movelib {
|
|
template<class It>
|
class reverse_iterator
|
{
|
public:
|
typedef typename boost::movelib::iterator_traits<It>::pointer pointer;
|
typedef typename boost::movelib::iterator_traits<It>::reference reference;
|
typedef typename boost::movelib::iterator_traits<It>::difference_type difference_type;
|
typedef typename boost::movelib::iterator_traits<It>::iterator_category iterator_category;
|
typedef typename boost::movelib::iterator_traits<It>::value_type value_type;
|
|
|
typedef It iterator_type;
|
|
reverse_iterator()
|
: m_current() //Value initialization to achieve "null iterators" (N3644)
|
{}
|
|
explicit reverse_iterator(It r)
|
: m_current(r)
|
{}
|
|
reverse_iterator(const reverse_iterator& r)
|
: m_current(r.base())
|
{}
|
|
template<class OtherIt>
|
reverse_iterator( const reverse_iterator<OtherIt>& r
|
, typename boost::move_detail::enable_if_convertible<OtherIt, It>::type* =0
|
)
|
: m_current(r.base())
|
{}
|
|
reverse_iterator & operator=( const reverse_iterator& r)
|
{ m_current = r.base(); return *this; }
|
|
template<class OtherIt>
|
typename boost::move_detail::enable_if_convertible<OtherIt, It, reverse_iterator &>::type
|
operator=( const reverse_iterator<OtherIt>& r)
|
{ m_current = r.base(); return *this; }
|
|
It base() const
|
{ return m_current; }
|
|
reference operator*() const
|
{
|
It temp(m_current);
|
--temp;
|
reference r = *temp;
|
return r;
|
}
|
|
pointer operator->() const
|
{
|
It temp(m_current);
|
--temp;
|
return iterator_arrow_result(temp);
|
}
|
|
reference operator[](difference_type off) const
|
{
|
return this->m_current[-off - 1];
|
}
|
|
reverse_iterator& operator++()
|
{
|
--m_current;
|
return *this;
|
}
|
|
reverse_iterator operator++(int)
|
{
|
reverse_iterator temp((*this));
|
--m_current;
|
return temp;
|
}
|
|
reverse_iterator& operator--()
|
{
|
++m_current;
|
return *this;
|
}
|
|
reverse_iterator operator--(int)
|
{
|
reverse_iterator temp((*this));
|
++m_current;
|
return temp;
|
}
|
|
friend bool operator==(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current == r.m_current; }
|
|
friend bool operator!=(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current != r.m_current; }
|
|
friend bool operator<(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current > r.m_current; }
|
|
friend bool operator<=(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current >= r.m_current; }
|
|
friend bool operator>(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current < r.m_current; }
|
|
friend bool operator>=(const reverse_iterator& l, const reverse_iterator& r)
|
{ return l.m_current <= r.m_current; }
|
|
reverse_iterator& operator+=(difference_type off)
|
{ m_current -= off; return *this; }
|
|
reverse_iterator& operator-=(difference_type off)
|
{ m_current += off; return *this; }
|
|
friend reverse_iterator operator+(reverse_iterator l, difference_type off)
|
{ return (l += off); }
|
|
friend reverse_iterator operator+(difference_type off, reverse_iterator r)
|
{ return (r += off); }
|
|
friend reverse_iterator operator-(reverse_iterator l, difference_type off)
|
{ return (l-= off); }
|
|
friend difference_type operator-(const reverse_iterator& l, const reverse_iterator& r)
|
{ return r.m_current - l.m_current; }
|
|
private:
|
It m_current; // the wrapped iterator
|
};
|
|
template< class Iterator >
|
reverse_iterator<Iterator> make_reverse_iterator( Iterator i )
|
{
|
return reverse_iterator<Iterator>(i);
|
}
|
|
} //namespace movelib {
|
} //namespace boost {
|
|
#include <boost/move/detail/config_end.hpp>
|
|
#endif //BOOST_MOVE_DETAIL_REVERSE_ITERATOR_HPP
|
