[3408] | 1 | // (C) Copyright Toon Knapen 2001. |
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| 2 | // (C) Copyright David Abrahams 2003. |
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| 3 | // (C) Copyright Roland Richter 2003. |
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 5 | // accompanying file LICENSE_1_0.txt or copy at |
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| 6 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | |
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| 8 | #ifndef BOOST_PERMUTATION_ITERATOR_HPP |
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| 9 | #define BOOST_PERMUTATION_ITERATOR_HPP |
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| 10 | |
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| 11 | #include <iterator> |
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| 12 | |
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| 13 | #include <boost/iterator/iterator_adaptor.hpp> |
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| 14 | |
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| 15 | |
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| 16 | namespace boost |
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| 17 | { |
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| 18 | |
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| 19 | template< class ElementIterator |
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| 20 | , class IndexIterator> |
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| 21 | class permutation_iterator |
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| 22 | : public iterator_adaptor< |
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| 23 | permutation_iterator<ElementIterator, IndexIterator> |
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| 24 | , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type |
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| 25 | , use_default, typename detail::iterator_traits<ElementIterator>::reference> |
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| 26 | { |
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| 27 | typedef iterator_adaptor< |
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| 28 | permutation_iterator<ElementIterator, IndexIterator> |
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| 29 | , IndexIterator, typename detail::iterator_traits<ElementIterator>::value_type |
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| 30 | , use_default, typename detail::iterator_traits<ElementIterator>::reference> super_t; |
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| 31 | |
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| 32 | friend class iterator_core_access; |
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| 33 | |
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| 34 | public: |
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| 35 | permutation_iterator() : m_elt_iter() {} |
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| 36 | |
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| 37 | explicit permutation_iterator(ElementIterator x, IndexIterator y) |
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| 38 | : super_t(y), m_elt_iter(x) {} |
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| 39 | |
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| 40 | template<class OtherElementIterator, class OtherIndexIterator> |
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| 41 | permutation_iterator( |
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| 42 | permutation_iterator<OtherElementIterator, OtherIndexIterator> const& r |
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| 43 | , typename enable_if_convertible<OtherElementIterator, ElementIterator>::type* = 0 |
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| 44 | , typename enable_if_convertible<OtherIndexIterator, IndexIterator>::type* = 0 |
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| 45 | ) |
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| 46 | : super_t(r.base()), m_elt_iter(r.m_elt_iter) |
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| 47 | {} |
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| 48 | |
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| 49 | private: |
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| 50 | typename super_t::reference dereference() const |
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| 51 | { return *(m_elt_iter + *this->base()); } |
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| 52 | |
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| 53 | #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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| 54 | template <class,class> friend class permutation_iterator; |
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| 55 | #else |
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| 56 | public: |
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| 57 | #endif |
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| 58 | ElementIterator m_elt_iter; |
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| 59 | }; |
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| 60 | |
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| 61 | |
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| 62 | template <class ElementIterator, class IndexIterator> |
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| 63 | permutation_iterator<ElementIterator, IndexIterator> |
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| 64 | make_permutation_iterator( ElementIterator e, IndexIterator i ) |
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| 65 | { |
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| 66 | return permutation_iterator<ElementIterator, IndexIterator>( e, i ); |
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| 67 | } |
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| 68 | |
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| 69 | |
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| 70 | } // namespace boost |
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| 71 | |
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| 72 | #endif |
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