[857] | 1 | // (C) Copyright Toon Knapen 2001.
|
---|
| 2 | // (C) Copyright David Abrahams 2003.
|
---|
| 3 | // (C) Copyright Roland Richter 2003.
|
---|
| 4 | // Distributed under the Boost Software License, Version 1.0. (See
|
---|
| 5 | // accompanying file LICENSE_1_0.txt or copy at
|
---|
| 6 | // http://www.boost.org/LICENSE_1_0.txt)
|
---|
| 7 |
|
---|
| 8 | #ifndef BOOST_PERMUTATION_ITERATOR_HPP
|
---|
| 9 | #define BOOST_PERMUTATION_ITERATOR_HPP
|
---|
| 10 |
|
---|
| 11 | #include <iterator>
|
---|
| 12 |
|
---|
| 13 | #include <boost/iterator/iterator_adaptor.hpp>
|
---|
| 14 |
|
---|
| 15 |
|
---|
| 16 | namespace boost
|
---|
| 17 | {
|
---|
| 18 |
|
---|
| 19 | template< class ElementIterator
|
---|
| 20 | , class IndexIterator>
|
---|
| 21 | class permutation_iterator
|
---|
| 22 | : public iterator_adaptor<
|
---|
| 23 | permutation_iterator<ElementIterator, IndexIterator>
|
---|
| 24 | , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type
|
---|
| 25 | , use_default, typename detail::iterator_traits<ElementIterator>::reference>
|
---|
| 26 | {
|
---|
| 27 | typedef iterator_adaptor<
|
---|
| 28 | permutation_iterator<ElementIterator, IndexIterator>
|
---|
| 29 | , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type
|
---|
| 30 | , use_default, typename detail::iterator_traits<ElementIterator>::reference> super_t;
|
---|
| 31 |
|
---|
| 32 | friend class iterator_core_access;
|
---|
| 33 |
|
---|
| 34 | public:
|
---|
| 35 | permutation_iterator() : m_elt_iter() {}
|
---|
| 36 |
|
---|
| 37 | explicit permutation_iterator(ElementIterator x, IndexIterator y)
|
---|
| 38 | : super_t(y), m_elt_iter(x) {}
|
---|
| 39 |
|
---|
| 40 | template<class OtherElementIterator, class OtherIndexIterator>
|
---|
| 41 | permutation_iterator(
|
---|
| 42 | permutation_iterator<OtherElementIterator, OtherIndexIterator> const& r
|
---|
| 43 | , typename enable_if_convertible<OtherElementIterator, ElementIterator>::type* = 0
|
---|
| 44 | , typename enable_if_convertible<OtherIndexIterator, IndexIterator>::type* = 0
|
---|
| 45 | )
|
---|
| 46 | : super_t(r.base()), m_elt_iter(r.m_elt_iter)
|
---|
| 47 | {}
|
---|
| 48 |
|
---|
| 49 | private:
|
---|
| 50 | typename super_t::reference dereference() const
|
---|
| 51 | { return *(m_elt_iter + *this->base()); }
|
---|
| 52 |
|
---|
| 53 | ElementIterator m_elt_iter;
|
---|
| 54 | };
|
---|
| 55 |
|
---|
| 56 |
|
---|
| 57 | template <class ElementIterator, class IndexIterator>
|
---|
| 58 | permutation_iterator<ElementIterator, IndexIterator>
|
---|
| 59 | make_permutation_iterator( ElementIterator e, IndexIterator i )
|
---|
| 60 | {
|
---|
| 61 | return permutation_iterator<ElementIterator, IndexIterator>( e, i );
|
---|
| 62 | }
|
---|
| 63 |
|
---|
| 64 |
|
---|
| 65 | } // namespace boost
|
---|
| 66 |
|
---|
| 67 | #endif
|
---|