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POHow to inherit from boost::geometry::model::point?
 

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  1. POHow to inherit from boost::geometry::model::point?
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    <p>I'd like to inherit from <a href="http://www.boost.org/doc/libs/1_54_0/libs/geometry/doc/html/geometry/reference/models/model_point.html#geometry.reference.models.model_point.c0" rel="nofollow">bg::model::point</a> to extend it with own functionality. The *point*s shall be stored in an <a href="http://www.boost.org/doc/libs/1_54_0/libs/geometry/doc/html/geometry/spatial_indexes/rtree_examples/specializing_index__indexable_function_object___storing_shared_pointers_in_the_rtree.html" rel="nofollow">rtree</a>.</p> <p>The following minimal example fails to compile the usage of my derived point (boost 1.54, gcc 4.7.2):</p> <pre><code>#include &lt;boost/geometry.hpp&gt; #include &lt;boost/geometry/geometries/point.hpp&gt; #include &lt;boost/geometry/geometries/box.hpp&gt; #include &lt;boost/geometry/index/rtree.hpp&gt; #include &lt;iostream&gt; #include &lt;boost/shared_ptr.hpp&gt; namespace bg = boost::geometry; namespace bgi = boost::geometry::index; namespace boost { namespace geometry { namespace index { // apparently necessary: template &lt;typename Box&gt; struct indexable&lt; boost::shared_ptr&lt;Box&gt; &gt; { typedef boost::shared_ptr&lt;Box&gt; V; typedef Box const&amp; result_type; result_type operator()(V const&amp; v) const { return *v; } }; }}} // namespace boost::geometry::index namespace { // anonymous namespace // myPoint template&lt;typename CoordinateType, std::size_t DimensionCount, typename CoordinateSystem&gt; class myPoint : public bg::model::point&lt;CoordinateType, DimensionCount, CoordinateSystem&gt;{ public: void sayHello(void); }; template&lt;typename CoordinateType, std::size_t DimensionCount, typename CoordinateSystem&gt; void myPoint&lt; CoordinateType, DimensionCount, CoordinateSystem &gt;::sayHello() { std::cout&lt;&lt;"Hello!"&lt;&lt;std::endl; } } // end anonymous namespace int main(void) { typedef bg::model::point&lt;float, 2, bg::cs::cartesian&gt; point; // boost point version typedef myPoint&lt;float, 2, bg::cs::cartesian&gt; mypoint; // custom point version // create the rtree using default constructor bgi::rtree&lt; boost::shared_ptr&lt;point&gt;, bgi::rstar&lt;16, 4&gt; &gt; rtree; // that works bgi::rtree&lt; boost::shared_ptr&lt;mypoint&gt;, bgi::rstar&lt;16, 4&gt; &gt; myrtree; // that doesn't works return 0; } </code></pre> <p>how can i derive from bg::model::point? or, instead of inheriting, is there a better approach?</p> <p>thanks!</p>
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    1. COit seems that custom points have to be registered. see [here](http://www.boost.org/doc/libs/1_54_0/libs/geometry/example/c01_custom_point_example.cpp).
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      1. POHow to inherit from boost::geometry::model::point?
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