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90 lines
2.1 KiB
90 lines
2.1 KiB
6 years ago
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// Copyright (c) 2009 Rutger ter Borg
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_NUMERIC_BINDINGS_DETAIL_LINEAR_ITERATOR_HPP
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#define BOOST_NUMERIC_BINDINGS_DETAIL_LINEAR_ITERATOR_HPP
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#include <boost/iterator/iterator_adaptor.hpp>
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namespace boost {
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namespace numeric {
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namespace bindings {
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namespace detail {
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template< typename T, typename StrideType >
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class linear_iterator: public boost::iterator_adaptor<
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linear_iterator<T, StrideType >,
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T*, use_default, random_access_traversal_tag > {
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public:
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typedef mpl::int_<StrideType::value> stride_type;
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linear_iterator():
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linear_iterator::iterator_adaptor_(0) {}
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explicit linear_iterator( T* p, StrideType ignore ):
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linear_iterator::iterator_adaptor_(p) {}
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private:
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friend class boost::iterator_core_access;
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void advance( int n ) {
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(this->base_reference()) += n * stride_type::value;
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}
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void decrement() {
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(this->base_reference()) -= stride_type::value;
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}
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void increment() {
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(this->base_reference()) += stride_type::value;
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}
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};
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template< typename T >
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class linear_iterator< T, std::ptrdiff_t >: public boost::iterator_adaptor<
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linear_iterator< T, std::ptrdiff_t >,
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T*, use_default, random_access_traversal_tag > {
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public:
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typedef std::ptrdiff_t stride_type;
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linear_iterator():
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linear_iterator::iterator_adaptor_(0),
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m_stride(0) {}
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explicit linear_iterator( T* p, std::ptrdiff_t stride ):
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linear_iterator::iterator_adaptor_(p),
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m_stride( stride ) {}
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private:
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friend class boost::iterator_core_access;
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void advance( int n ) {
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(this->base_reference()) += n * m_stride;
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}
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void decrement() {
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(this->base_reference()) -= m_stride;
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}
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void increment() {
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(this->base_reference()) += m_stride;
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}
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std::ptrdiff_t m_stride;
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};
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} // namespace detail
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} // namespace bindings
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} // namespace numeric
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} // namespace boost
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#endif
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