boost/fusion/view/single_view/single_view.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2011 Eric Niebler
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(BOOST_FUSION_SINGLE_VIEW_05052005_0335)
   9 #define BOOST_FUSION_SINGLE_VIEW_05052005_0335
  10
  11 #include <boost/fusion/support/detail/access.hpp>
  12 #include <boost/fusion/support/detail/as_fusion_element.hpp>
  13 #include <boost/fusion/support/sequence_base.hpp>
  14 #include <boost/fusion/view/single_view/single_view_iterator.hpp>
  15 #include <boost/fusion/view/single_view/detail/at_impl.hpp>
  16 #include <boost/fusion/view/single_view/detail/begin_impl.hpp>
  17 #include <boost/fusion/view/single_view/detail/end_impl.hpp>
  18 #include <boost/fusion/view/single_view/detail/size_impl.hpp>
  19 #include <boost/fusion/view/single_view/detail/value_at_impl.hpp>
  20 #include <boost/mpl/bool.hpp>
  21 #include <boost/mpl/int.hpp>
  22 #include <boost/config.hpp>
  23
  24 #if defined (BOOST_MSVC)
  25 #  pragma warning(push)
  26 #  pragma warning (disable: 4512) // assignment operator could not be generated.
  27 #endif
  28
  29 namespace boost { namespace fusion
  30 {
  31     struct single_view_tag;
  32     struct random_access_traversal_tag;
  33     struct fusion_sequence_tag;
  34
  35     template <typename T>
  36     struct single_view : sequence_base<single_view<T> >
  37     {
  38         typedef single_view_tag fusion_tag;
  39         typedef fusion_sequence_tag tag; // this gets picked up by MPL
  40         typedef random_access_traversal_tag category;
  41         typedef mpl::true_ is_view;
  42         typedef mpl::int_<1> size;
  43         typedef T value_type;
  44
  45         single_view()
  46             : val() {}
  47
  48         explicit single_view(typename detail::call_param<T>::type in_val)
  49             : val(in_val) {}
  50
  51         value_type val;
  52     };
  53
  54     template <typename T>
  55     inline single_view<typename detail::as_fusion_element<T>::type>
  56     make_single_view(T const& v)
  57     {
  58         return single_view<typename detail::as_fusion_element<T>::type>(v);
  59     }
  60 }}
  61
  62 #if defined (BOOST_MSVC)
  63 #  pragma warning(pop)
  64 #endif
  65
  66 #endif
  67
  68