single_view/detail/begin_impl.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003     Copyright (c) 2011 Eric Niebler
0004
0005     Distributed under the Boost Software License, Version 1.0. (See accompanying
0006     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007 ==============================================================================*/
0008 #if !defined(BOOST_FUSION_SINGLE_VIEW_BEGIN_IMPL_05052005_0305)
0009 #define BOOST_FUSION_SINGLE_VIEW_BEGIN_IMPL_05052005_0305
0010
0011 #include <boost/fusion/support/config.hpp>
0012 #include <boost/mpl/int.hpp>
0013
0014 namespace boost { namespace fusion
0015 {
0016     struct single_view_tag;
0017
0018     template <typename SingleView, typename Pos>
0019     struct single_view_iterator;
0020
0021     namespace extension
0022     {
0023         template <typename Tag>
0024         struct begin_impl;
0025
0026         template <>
0027         struct begin_impl<single_view_tag>
0028         {
0029             template <typename Sequence>
0030             struct apply
0031             {
0032                 typedef single_view_iterator<Sequence, mpl::int_<0> > type;
0033
0034                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0035                 static type
0036                 call(Sequence& seq)
0037                 {
0038                     return type(seq);
0039                 }
0040             };
0041         };
0042     }
0043 }}
0044
0045 #endif
0046
0047