71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// times2_iterator.hpp
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//
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// Copyright 2006 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
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#define BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
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#include <functional>
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#include <boost/detail/workaround.hpp>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/iterator_range.hpp>
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#include <boost/iterator/transform_iterator.hpp>
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#include <boost/iterator/counting_iterator.hpp>
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#include <boost/iterator/permutation_iterator.hpp>
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namespace boost { namespace accumulators
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{
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namespace detail
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{
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typedef transform_iterator<
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#ifdef BOOST_NO_CXX98_BINDERS
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decltype(std::bind(std::multiplies<std::size_t>(), 2, std::placeholders::_1))
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#else
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std::binder1st<std::multiplies<std::size_t> >
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#endif
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, counting_iterator<std::size_t>
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> times2_iterator;
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inline times2_iterator make_times2_iterator(std::size_t i)
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{
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return make_transform_iterator(
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make_counting_iterator(i)
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#ifdef BOOST_NO_CXX98_BINDERS
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, std::bind(std::multiplies<std::size_t>(), 2, std::placeholders::_1)
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#else
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, std::bind1st(std::multiplies<std::size_t>(), 2)
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#endif
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);
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}
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///////////////////////////////////////////////////////////////////////////////
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// lvalue_index_iterator
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template<typename Base>
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struct lvalue_index_iterator
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: Base
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{
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lvalue_index_iterator()
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: Base()
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{}
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lvalue_index_iterator(Base base)
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: Base(base)
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{
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}
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typename Base::reference operator [](typename Base::difference_type n) const
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{
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return *(*this + n);
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}
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};
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} // namespace detail
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}}
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#endif
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