ceph/src/boost/boost/accumulators/statistics/times2_iterator.hpp

   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
  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     {
  52         lvalue_index_iterator()
  53           : Base()
  54         {}
  55
  56         lvalue_index_iterator(Base base)
  57           : Base(base)
  58         {
  59         }
  60
  61         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