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