如何為OGRPoint和OGRLineString注冊Boost.Geometry距離策略？

Question

我正在創建一個包裝程序，該包裝程序允許將OGR的類與Boost.Geometry一起使用。 到目前為止，我已經創建了必要的迭代器外觀，並使用OGRPoint注冊了OGR的幾何類（ OGRPoint ， OGRLineString ， OGRLinearRing和OGRPolygon ）。

現在，我想將OGRGeometry::Distance()類的OGR類謂詞與boost一起使用，而不是Boost.Geometry所使用的謂詞（例如，因為股票Boost.Geometry 1.57.0沒有任何映射概念）突起）。 它適用於boost::geometry::distance(OGRPoint, OGRPoint) ，但不適用於bg::distance(OGRPoint, OGRLineString)或任何其他點集合。 我的猜測是因為Boost.Geometry將線串，圓環和多邊形視為要迭代的點的有序集合，因為編譯器嘗試實例化以下模板：

struct boost::geometry::strategy::distance::services::default_strategy<
        boost::geometry::point_tag,
        boost::geometry::segment_tag,
        OGRPoint,                           // NOTE: Twice OGRPoint!
        OGRPoint,
        MyCode::OGRCoordinateSystemTag,
        MyCode::OGRCoordinateSystemTag, void>

完整的錯誤消息如下：

In file included from /usr/include/boost/geometry/strategies/strategies.hpp:30:0,
                 from /usr/include/boost/geometry/geometry.hpp:43,
                 from /usr/include/boost/geometry.hpp:17,
                 from ../../../winzent/test/simulation/OGRLineStringAdapterTest.cpp:7:
/usr/include/boost/geometry/strategies/distance.hpp: In instantiation of 'struct boost::geometry::strategy::distance::services::default_strategy<boost::geometry::point_tag, boost::geometry::segment_tag, OGRPoint, OGRPoint, Winzent::Simulation::boost::OGRCoordinateSystemTag, Winzent::Simulation::boost::OGRCoordinateSystemTag, void>':
/usr/include/boost/geometry/algorithms/detail/distance/default_strategies.hpp:57:8:   required from 'struct boost::geometry::detail::distance::default_strategy<OGRPoint, OGRLineString, boost::geometry::pointlike_tag, boost::geometry::linestring_tag, false>'
/usr/include/boost/geometry/algorithms/detail/distance/default_strategies.hpp:73:8:   required from 'struct boost::geometry::detail::distance::default_strategy<OGRLineString, OGRPoint, boost::geometry::linestring_tag, boost::geometry::pointlike_tag, true>'
/usr/include/boost/geometry/strategies/distance_result.hpp:60:8:   required from 'struct boost::geometry::resolve_strategy::distance_result<OGRLineString, OGRPoint, boost::geometry::default_strategy>'
/usr/include/boost/geometry/strategies/distance_result.hpp:79:8:   required from 'struct boost::geometry::resolve_variant::distance_result<OGRLineString, OGRPoint, boost::geometry::default_strategy>'
/usr/include/boost/geometry/strategies/distance_result.hpp:199:8:   required from 'struct boost::geometry::distance_result<OGRLineString, OGRPoint, boost::geometry::default_strategy>'
/usr/include/boost/geometry/strategies/distance_result.hpp:205:8:   required from 'struct boost::geometry::distance_result<OGRLineString, OGRPoint, void>'
/usr/include/boost/geometry/strategies/default_distance_result.hpp:35:8:   required from 'struct boost::geometry::default_distance_result<OGRLineString, OGRPoint>'
/usr/include/boost/geometry/algorithms/detail/distance/interface.hpp:392:1:   required by substitution of 'template<class Geometry1, class Geometry2> typename boost::geometry::default_distance_result<Geometry1, Geometry2>::type boost::geometry::distance(const Geometry1&, const Geometry2&) [with Geometry1 = OGRLineString; Geometry2 = OGRPoint]'
../../../winzent/test/simulation/OGRLineStringAdapterTest.cpp:71:62:   required from here
/usr/include/boost/geometry/strategies/distance.hpp:97:456: error: no matching function for call to 'assertion_failed(mpl_::failed************ (boost::geometry::strategy::distance::services::default_strategy<boost::geometry::point_tag, boost::geometry::segment_tag, OGRPoint, OGRPoint, Winzent::Simulation::boost::OGRCoordinateSystemTag, Winzent::Simulation::boost::OGRCoordinateSystemTag, void>::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE_COMBINATION::************)(mpl_::assert_::types<OGRPoint, OGRPoint, Winzent::Simulation::boost::OGRCoordinateSystemTag, Winzent::Simulation::boost::OGRCoordinateSystemTag>))'
     BOOST_MPL_ASSERT_MSG

所以我嘗試提供專門用於struct boost::geometry::detail::distance::default_strategy<OGRPoint, OGRLineString, boost::geometry::pointlike_tag, boost::geometry::linestring_tag, false>的模板專業化，但是沒有運氣---相同的錯誤消息盛行。

這是我的代碼：

namespace boost {
    namespace geometry {
        namespace detail {
            namespace distance {


                template <>
                struct default_strategy<
                        OGRPoint,
                        OGRLineString,
                        pointlike_tag,
                        linestring_tag,
                        false>
                {
                    typedef OGRPointToLineStringDistanceStrategy type;
                };
            } // namespace distance
        } // namespace detail
    } // namespace geometry
} // namespace boost

我如何“攔截”導致使用迭代器/范圍概念的模板實例化，並直接使用OGRGeometry::Distance() ？

Answer 1

事實證明，使用兩種不同的算法，該問題與OGR和Boost無關。 相反，應該歸咎於我的適配器代碼。 更具體地說，我編寫的迭代器外觀是為了使OGRLineString ， OGRLinearRing以及最終OGRPolygon適應Boost.Geometry代碼。 認識到該問題后，我立即發布了一個問題： 為寫指針API創建行為良好的迭代器 。

我當前正在使用（也是最終版本）的版本可以作為GitHub項目獲得 。 也許有人覺得它有用。