boost/fusion/algorithm/iteration/ext_/for_each_s.hpp

   1 /*=============================================================================
   2     Copyright (c) 2006 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(FUSION_FOR_EACH_S_05022006_1027)
   8 #define FUSION_FOR_EACH_S_05022006_1027
   9
  10 #include <boost/mpl/assert.hpp>
  11 #include <boost/utility/enable_if.hpp>
  12 #include <boost/fusion/algorithm/iteration/for_each.hpp>
  13 #include <boost/fusion/sequence/intrinsic/ext_/segments.hpp>
  14 #include <boost/fusion/support/ext_/is_segmented.hpp>
  15
  16 // fwd declarations
  17 namespace boost { namespace fusion
  18 {
  19     template <typename Sequence, typename F>
  20     void
  21     for_each_s(Sequence& seq, F const& f);
  22
  23     template <typename Sequence, typename F>
  24     void
  25     for_each_s(Sequence const& seq, F const& f);
  26 }}
  27
  28 namespace boost { namespace fusion { namespace detail
  29 {
  30     template<typename F>
  31     struct for_each_s_bind
  32     {
  33         explicit for_each_s_bind(F const &f)
  34           : f_(f)
  35         {}
  36
  37         template<typename Sequence>
  38         void operator ()(Sequence &seq) const
  39         {
  40             fusion::for_each_s(seq, this->f_);
  41         }
  42
  43         template<typename Sequence>
  44         void operator ()(Sequence const &seq) const
  45         {
  46             fusion::for_each_s(seq, this->f_);
  47         }
  48     private:
  49         F const &f_;
  50     };
  51
  52     template<typename Sequence, typename F>
  53     void for_each_s(Sequence &seq, F const &f, mpl::true_)
  54     {
  55         fusion::for_each_s(fusion::segments(seq), for_each_s_bind<F>(f));
  56     }
  57
  58     template<typename Sequence, typename F>
  59     void for_each_s(Sequence &seq, F const &f, mpl::false_)
  60     {
  61         fusion::for_each(seq, f);
  62     }
  63 }}}
  64
  65 namespace boost { namespace fusion
  66 {
  67     namespace result_of
  68     {
  69         template <typename Sequence, typename F>
  70         struct for_each_s
  71         {
  72             typedef void type;
  73         };
  74     }
  75
  76     template <typename Sequence, typename F>
  77     inline void
  78     for_each_s(Sequence& seq, F const& f)
  79     {
  80         detail::for_each_s(seq, f, traits::is_segmented<Sequence>());
  81     }
  82
  83     template <typename Sequence, typename F>
  84     inline void
  85     for_each_s(Sequence const& seq, F const& f)
  86     {
  87         detail::for_each_s(seq, f, traits::is_segmented<Sequence>());
  88     }
  89 }}
  90
  91 #endif