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