Hi,
i'm working on a point-in-polygon test. my current implementation has a list
with plain pointers that hold references to the polygons' properties. (i use
them to ease the calculating of an inside-result for that polygons)
Code:
class FetchedPolygon {
public:
FetchedPolygon(osg::Geometry* geom = NULL, osg::Vec3Array* verts =
NULL);
osg::Geometry* geometry;
osg::Vec3Array* vertices;
std::vector<osg::PrimitiveSet*> primitiveSets;
};
std::map<const unsigned int, FetchedPolygon> fetchedPolygons;
before, i used smart-pointers to reference the polygons. (of course) it works
both ways, but i can't decide what typ of referencing to use.
i think if i use smart-pointers, i would be able to check if the actual
polygons in the scenegraph are still valid (check the ref counter) without the
need of a dirty flag.
but if the polygons get changed/deleted (e.g. when i want to load a new set of
polygon features) the properties i'm pointing to wouldn't be deleted as long as
the smart-pointers are referencing them.
i think its hard to give a rule of thumb when to use smart-pointers. in general
i'm using them when objects (especially for the scenegraph) are created - as
long as they won't be attached to another scenegraph-object on the next line.
i don't use them to reference these already allocated objects, e.g. when they
are passed to another function, i would use a local pointer inside.
so what your suggestions? Thanks in advance,
christian
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=9282#9282
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