Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // times2_iterator.hpp
Chris@16: //
Chris@16: //  Copyright 2006 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
Chris@16: #define BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006
Chris@16: 
Chris@16: #include <functional>
Chris@101: #include <boost/detail/workaround.hpp>
Chris@16: #include <boost/range/begin.hpp>
Chris@16: #include <boost/range/end.hpp>
Chris@16: #include <boost/range/iterator_range.hpp>
Chris@16: #include <boost/iterator/transform_iterator.hpp>
Chris@16: #include <boost/iterator/counting_iterator.hpp>
Chris@16: #include <boost/iterator/permutation_iterator.hpp>
Chris@16: 
Chris@16: namespace boost { namespace accumulators
Chris@16: {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:     typedef transform_iterator<
Chris@16:         std::binder1st<std::multiplies<std::size_t> >
Chris@16:       , counting_iterator<std::size_t>
Chris@16:     > times2_iterator;
Chris@16: 
Chris@16:     inline times2_iterator make_times2_iterator(std::size_t i)
Chris@16:     {
Chris@16:         return make_transform_iterator(
Chris@16:             make_counting_iterator(i)
Chris@16:           , std::bind1st(std::multiplies<std::size_t>(), 2)
Chris@16:         );
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     // lvalue_index_iterator
Chris@16:     template<typename Base>
Chris@16:     struct lvalue_index_iterator
Chris@16:       : Base
Chris@16:     {
Chris@101:         lvalue_index_iterator()
Chris@101:           : Base()
Chris@101:         {}
Chris@101: 
Chris@16:         lvalue_index_iterator(Base base)
Chris@16:           : Base(base)
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         typename Base::reference operator [](typename Base::difference_type n) const
Chris@16:         {
Chris@16:             return *(*this + n);
Chris@16:         }
Chris@16:     };
Chris@16: } // namespace detail
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif