3rdparty/boost/boost/fusion/sequence/intrinsic/detail/segmented_size.hpp

   1 /*=============================================================================
   2     Copyright (c) 2011 Eric Niebler
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_FUSION_SEGMENTED_SIZE_08112006_1141)
   8 #define BOOST_FUSION_SEGMENTED_SIZE_08112006_1141
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/type_traits/add_const.hpp>
  12 #include <boost/type_traits/remove_reference.hpp>
  13 #include <boost/mpl/fold.hpp>
  14 #include <boost/mpl/plus.hpp>
  15 #include <boost/mpl/size_t.hpp>
  16 #include <boost/mpl/placeholders.hpp>
  17 #include <boost/fusion/sequence/intrinsic_fwd.hpp>
  18 #include <boost/fusion/mpl/begin.hpp>
  19 #include <boost/fusion/mpl/end.hpp>
  20 #include <boost/fusion/support/is_segmented.hpp>
  21
  22 namespace boost { namespace fusion { namespace detail
  23 {
  24     ///////////////////////////////////////////////////////////////////////////
  25     // calculates the size of any segmented data structure.
  26     template<typename Sequence>
  27     struct segmented_size;
  28
  29     ///////////////////////////////////////////////////////////////////////////
  30     template<typename Sequence, bool IsSegmented = traits::is_segmented<Sequence>::value>
  31     struct segmented_size_impl
  32       : mpl::fold<
  33             typename remove_reference<
  34                 typename add_const<
  35                     typename result_of::segments<Sequence>::type
  36                 >::type
  37             >::type
  38           , mpl::size_t<0>
  39           , mpl::plus<mpl::_1, segmented_size<remove_reference<mpl::_2> > >
  40         >::type
  41     {};
  42
  43     template<typename Sequence>
  44     struct segmented_size_impl<Sequence, false>
  45       : result_of::size<Sequence>::type
  46     {};
  47
  48     template<typename Sequence>
  49     struct segmented_size
  50       : segmented_size_impl<Sequence>
  51     {};
  52
  53 }}}
  54
  55 #endif