| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| // Copyright (c) 2011 Akira Takahashi |
| // Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands. |
| |
| // Use, modification and distribution is subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_GEOMETRY_GEOMETRIES_ADAPTED_FUSION_HPP |
| #define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_FUSION_HPP |
| |
| |
| #include <cstddef> |
| |
| #include <boost/fusion/include/is_sequence.hpp> |
| #include <boost/fusion/include/size.hpp> |
| #include <boost/fusion/include/tag_of.hpp> |
| #include <boost/fusion/include/front.hpp> |
| #include <boost/fusion/include/at.hpp> |
| #include <boost/utility/enable_if.hpp> |
| |
| #include <boost/fusion/mpl.hpp> |
| #include <boost/mpl/front.hpp> |
| #include <boost/mpl/count_if.hpp> |
| #include <boost/mpl/pop_front.hpp> |
| #include <boost/mpl/size.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| #include <boost/type_traits/remove_reference.hpp> |
| #include <boost/mpl/placeholders.hpp> |
| #include <boost/mpl/and.hpp> |
| #include <boost/mpl/front.hpp> |
| |
| #include <boost/geometry/core/access.hpp> |
| #include <boost/geometry/core/coordinate_dimension.hpp> |
| #include <boost/geometry/core/coordinate_system.hpp> |
| #include <boost/geometry/core/coordinate_type.hpp> |
| #include <boost/geometry/core/point_type.hpp> |
| #include <boost/geometry/core/tags.hpp> |
| |
| |
| namespace boost { namespace geometry |
| { |
| |
| namespace fusion_adapt_detail |
| { |
| |
| template <class Sequence> |
| struct all_same : |
| boost::mpl::bool_< |
| boost::mpl::count_if< |
| Sequence, |
| boost::is_same< |
| typename boost::mpl::front<Sequence>::type, |
| boost::mpl::_ |
| > |
| >::value == boost::mpl::size<Sequence>::value |
| > |
| {}; |
| |
| template <class Sequence> |
| struct is_coordinate_size : boost::mpl::bool_< |
| boost::fusion::result_of::size<Sequence>::value == 2 || |
| boost::fusion::result_of::size<Sequence>::value == 3> {}; |
| |
| template<typename Sequence> |
| struct is_fusion_sequence |
| : mpl::and_<boost::fusion::traits::is_sequence<Sequence>, |
| fusion_adapt_detail::is_coordinate_size<Sequence>, |
| fusion_adapt_detail::all_same<Sequence> > |
| {}; |
| |
| |
| } // namespace fusion_adapt_detail |
| |
| |
| #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS |
| namespace traits |
| { |
| |
| // Boost Fusion Sequence, 2D or 3D |
| template <typename Sequence> |
| struct coordinate_type |
| < |
| Sequence, |
| typename boost::enable_if |
| < |
| fusion_adapt_detail::is_fusion_sequence<Sequence> |
| >::type |
| > |
| { |
| typedef typename boost::mpl::front<Sequence>::type type; |
| }; |
| |
| |
| template <typename Sequence> |
| struct dimension |
| < |
| Sequence, |
| typename boost::enable_if |
| < |
| fusion_adapt_detail::is_fusion_sequence<Sequence> |
| >::type |
| > : boost::mpl::size<Sequence> |
| {}; |
| |
| |
| template <typename Sequence, std::size_t Dimension> |
| struct access |
| < |
| Sequence, |
| Dimension, |
| typename boost::enable_if |
| < |
| fusion_adapt_detail::is_fusion_sequence<Sequence> |
| >::type |
| > |
| { |
| typedef typename coordinate_type<Sequence>::type ctype; |
| |
| static inline ctype get(Sequence const& point) |
| { |
| return boost::fusion::at_c<Dimension>(point); |
| } |
| |
| template <class CoordinateType> |
| static inline void set(Sequence& point, CoordinateType const& value) |
| { |
| boost::fusion::at_c<Dimension>(point) = value; |
| } |
| }; |
| |
| |
| template <typename Sequence> |
| struct tag |
| < |
| Sequence, |
| typename boost::enable_if |
| < |
| fusion_adapt_detail::is_fusion_sequence<Sequence> |
| >::type |
| > |
| { |
| typedef point_tag type; |
| }; |
| |
| |
| } // namespace traits |
| |
| #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS |
| |
| |
| }} // namespace boost::geometry |
| |
| |
| // Convenience registration macro to bind a Fusion sequence to a CS |
| #define BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(CoordinateSystem) \ |
| namespace boost { namespace geometry { namespace traits { \ |
| template <typename Sequence> \ |
| struct coordinate_system \ |
| < \ |
| Sequence, \ |
| typename boost::enable_if \ |
| < \ |
| fusion_adapt_detail::is_fusion_sequence<Sequence> \ |
| >::type \ |
| > \ |
| { typedef cs::cartesian type; }; \ |
| }}} |
| |
| |
| #endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_FUSION_HPP |