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/config.hpp> 12 #include <boost/fusion/support/detail/access.hpp> 13 #include <boost/fusion/support/detail/as_fusion_element.hpp> 14 #include <boost/fusion/support/sequence_base.hpp> 15 #include <boost/fusion/view/single_view/single_view_iterator.hpp> 16 #include <boost/fusion/view/single_view/detail/at_impl.hpp> 17 #include <boost/fusion/view/single_view/detail/begin_impl.hpp> 18 #include <boost/fusion/view/single_view/detail/end_impl.hpp> 19 #include <boost/fusion/view/single_view/detail/size_impl.hpp> 20 #include <boost/fusion/view/single_view/detail/value_at_impl.hpp> 21 #include <boost/mpl/bool.hpp> 22 #include <boost/mpl/int.hpp> 23 #include <boost/config.hpp> 24 25 #if defined (BOOST_MSVC) 26 # pragma warning(push) 27 # pragma warning (disable: 4512) // assignment operator could not be generated. 28 #endif 29 30 namespace boost { namespace fusion 31 { 32 struct single_view_tag; 33 struct random_access_traversal_tag; 34 struct fusion_sequence_tag; 35 36 template <typename T> 37 struct single_view : sequence_base<single_view<T> > 38 { 39 typedef single_view_tag fusion_tag; 40 typedef fusion_sequence_tag tag; // this gets picked up by MPL 41 typedef random_access_traversal_tag category; 42 typedef mpl::true_ is_view; 43 typedef mpl::int_<1> size; 44 typedef T value_type; 45 46 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED single_viewboost::fusion::single_view47 single_view() 48 : val() {} 49 50 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED single_viewboost::fusion::single_view51 explicit single_view(typename detail::call_param<T>::type in_val) 52 : val(in_val) {} 53 54 value_type val; 55 }; 56 57 template <typename T> 58 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED 59 inline single_view<typename detail::as_fusion_element<T>::type> make_single_view(T const & v)60 make_single_view(T const& v) 61 { 62 return single_view<typename detail::as_fusion_element<T>::type>(v); 63 } 64 }} 65 66 #if defined (BOOST_MSVC) 67 # pragma warning(pop) 68 #endif 69 70 #endif 71 72 73