1 /////////////////////////////////////////////////////////////////////////////// 2 // times2_iterator.hpp 3 // 4 // Copyright 2006 Eric Niebler. Distributed under the Boost 5 // Software License, Version 1.0. (See accompanying file 6 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 7 8 #ifndef BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006 9 #define BOOST_ACCUMULATORS_STATISTICS_TIMES2_ITERATOR_HPP_DE_01_01_2006 10 11 #include <functional> 12 #include <boost/detail/workaround.hpp> 13 #include <boost/range/begin.hpp> 14 #include <boost/range/end.hpp> 15 #include <boost/range/iterator_range.hpp> 16 #include <boost/iterator/transform_iterator.hpp> 17 #include <boost/iterator/counting_iterator.hpp> 18 #include <boost/iterator/permutation_iterator.hpp> 19 20 namespace boost { namespace accumulators 21 { 22 23 namespace detail 24 { 25 typedef transform_iterator< 26 #ifdef BOOST_NO_CXX98_BINDERS 27 decltype(std::bind(std::multiplies<std::size_t>(), 2, std::placeholders::_1)) 28 #else 29 std::binder1st<std::multiplies<std::size_t> > 30 #endif 31 , counting_iterator<std::size_t> 32 > times2_iterator; 33 make_times2_iterator(std::size_t i)34 inline times2_iterator make_times2_iterator(std::size_t i) 35 { 36 return make_transform_iterator( 37 make_counting_iterator(i) 38 #ifdef BOOST_NO_CXX98_BINDERS 39 , std::bind(std::multiplies<std::size_t>(), 2, std::placeholders::_1) 40 #else 41 , std::bind1st(std::multiplies<std::size_t>(), 2) 42 #endif 43 ); 44 } 45 46 /////////////////////////////////////////////////////////////////////////////// 47 // lvalue_index_iterator 48 template<typename Base> 49 struct lvalue_index_iterator 50 : Base 51 { lvalue_index_iteratorboost::accumulators::detail::lvalue_index_iterator52 lvalue_index_iterator() 53 : Base() 54 {} 55 lvalue_index_iteratorboost::accumulators::detail::lvalue_index_iterator56 lvalue_index_iterator(Base base) 57 : Base(base) 58 { 59 } 60 operator []boost::accumulators::detail::lvalue_index_iterator61 typename Base::reference operator [](typename Base::difference_type n) const 62 { 63 return *(*this + n); 64 } 65 }; 66 } // namespace detail 67 68 }} 69 70 #endif 71