| /////////////////////////////////////////////////////////////////////////////// |
| // 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 |