forked from boostorg/iterator
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
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// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#ifndef BOOST_REVERSE_ITERATOR_23022003THW_HPP
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#define BOOST_REVERSE_ITERATOR_23022003THW_HPP
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#include <boost/iterator.hpp>
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#include <boost/utility.hpp>
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#include <boost/iterator/iterator_adaptor.hpp>
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namespace boost
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{
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//
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//
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//
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template <class Iterator>
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class reverse_iterator
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: public iterator_adaptor< reverse_iterator<Iterator>, Iterator >
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{
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typedef iterator_adaptor< reverse_iterator<Iterator>, Iterator > super_t;
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friend class iterator_core_access;
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public:
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reverse_iterator() {}
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explicit reverse_iterator(Iterator x)
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: super_t(x) {}
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template<class OtherIterator>
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reverse_iterator(
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reverse_iterator<OtherIterator> const& r
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, typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
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)
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: super_t(r.base())
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{}
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private:
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typename super_t::reference dereference() const { return *boost::prior(this->base()); }
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void increment() { --this->base_reference(); }
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void decrement() { ++this->base_reference(); }
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void advance(typename super_t::difference_type n)
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{
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this->base_reference() += -n;
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}
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template <class OtherIterator>
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typename super_t::difference_type
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distance_to(reverse_iterator<OtherIterator> const& y) const
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{
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return this->base_reference() - y.base();
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}
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};
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template <class BidirectionalIterator>
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reverse_iterator<BidirectionalIterator> make_reverse_iterator(BidirectionalIterator x)
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{
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return reverse_iterator<BidirectionalIterator>(x);
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}
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} // namespace boost
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#endif // BOOST_REVERSE_ITERATOR_23022003THW_HPP
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