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131 lines
3.9 KiB
ReStructuredText
131 lines
3.9 KiB
ReStructuredText
.. Copyright David Abrahams 2006. Distributed under the Boost
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.. Software License, Version 1.0. (See accompanying
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.. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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.. parsed-literal::
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template< class ElementIterator
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, class IndexIterator
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, class ValueT = use_default
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, class CategoryT = use_default
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, class ReferenceT = use_default
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, class DifferenceT = use_default >
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class permutation_iterator
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{
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public:
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permutation_iterator();
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explicit permutation_iterator(ElementIterator x, IndexIterator y);
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template< class OEIter, class OIIter, class V, class C, class R, class D >
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permutation_iterator(
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permutation_iterator<OEIter, OIIter, V, C, R, D> const& r
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, typename enable_if_convertible<OEIter, ElementIterator>::type* = 0
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, typename enable_if_convertible<OIIter, IndexIterator>::type* = 0
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);
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reference operator*() const;
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permutation_iterator& operator++();
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ElementIterator const& base() const;
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private:
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ElementIterator m_elt; // exposition only
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IndexIterator m_order; // exposition only
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};
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template <class ElementIterator, class IndexIterator>
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permutation_iterator<ElementIterator, IndexIterator>
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make_permutation_iterator( ElementIterator e, IndexIterator i);
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``permutation_iterator`` requirements
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-------------------------------------
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``ElementIterator`` shall model Random Access Traversal Iterator.
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``IndexIterator`` shall model Readable Iterator. The value type of
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the ``IndexIterator`` must be convertible to the difference type of
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``ElementIterator``.
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``permutation_iterator`` models
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-------------------------------
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``permutation_iterator`` models the same iterator traversal concepts
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as ``IndexIterator`` and the same iterator access concepts as
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``ElementIterator``.
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If ``IndexIterator`` models Single Pass Iterator and
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``ElementIterator`` models Readable Iterator then
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``permutation_iterator`` models Input Iterator.
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If ``IndexIterator`` models Forward Traversal Iterator and
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``ElementIterator`` models Readable Lvalue Iterator then
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``permutation_iterator`` models Forward Iterator.
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If ``IndexIterator`` models Bidirectional Traversal Iterator and
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``ElementIterator`` models Readable Lvalue Iterator then
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``permutation_iterator`` models Bidirectional Iterator.
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If ``IndexIterator`` models Random Access Traversal Iterator and
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``ElementIterator`` models Readable Lvalue Iterator then
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``permutation_iterator`` models Random Access Iterator.
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``permutation_iterator<E1, X, V1, C2, R1, D1>`` is interoperable
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with ``permutation_iterator<E2, Y, V2, C2, R2, D2>`` if and only if
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``X`` is interoperable with ``Y`` and ``E1`` is convertible
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to ``E2``.
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``permutation_iterator`` operations
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-----------------------------------
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In addition to those operations required by the concepts that
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``permutation_iterator`` models, ``permutation_iterator`` provides the
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following operations.
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``permutation_iterator();``
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:Effects: Default constructs ``m_elt`` and ``m_order``.
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``explicit permutation_iterator(ElementIterator x, IndexIterator y);``
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:Effects: Constructs ``m_elt`` from ``x`` and ``m_order`` from ``y``.
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::
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template< class OEIter, class OIIter, class V, class C, class R, class D >
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permutation_iterator(
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permutation_iterator<OEIter, OIIter, V, C, R, D> const& r
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, typename enable_if_convertible<OEIter, ElementIterator>::type* = 0
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, typename enable_if_convertible<OIIter, IndexIterator>::type* = 0
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);
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:Effects: Constructs ``m_elt`` from ``r.m_elt`` and
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``m_order`` from ``y.m_order``.
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``reference operator*() const;``
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:Returns: ``*(m_elt + *m_order)``
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``permutation_iterator& operator++();``
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:Effects: ``++m_order``
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:Returns: ``*this``
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``ElementIterator const& base() const;``
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:Returns: ``m_order``
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::
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template <class ElementIterator, class IndexIterator>
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permutation_iterator<ElementIterator, IndexIterator>
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make_permutation_iterator(ElementIterator e, IndexIterator i);
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:Returns: ``permutation_iterator<ElementIterator, IndexIterator>(e, i)``
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