Tessellate edges from a TopoDS_Shape

Hi,

I tried the following to detect the double edges: I push all 'used' edges into a std::vector. And when iterating over the edges of a face, I first check, if the Edge is already in the vector with the help of 'IsEqual'.

But this doesn't work. How can I test if two TopoDS_Edge objects refer to the same edge in the solid?

int count_writes{};

//
std::vector<TopoDS_Edge> written_edges;
auto nbs = reader.NbShapes();
for (Standard_Integer i = 1; i <= nbs; ++i)
{
	auto shape = reader.Shape(i);

	//we must iterate over the faces to check for closed loops to recognize 'seam' edges
	TopExp_Explorer ex_face;
	for (ex_face.Init(shape, TopAbs_FACE); ex_face.More(); ex_face.Next())
	{
		auto face = TopoDS::Face(ex_face.Current());

		TopExp_Explorer ex_ed;
		
		for (ex_ed.Init(ex_face.Current(), TopAbs_EDGE); ex_ed.More(); ex_ed.Next())
		{
			auto edge = TopoDS::Edge(ex_ed.Current());
		
			//check if the edge is really and egde and not a seam
			if (BRep_Tool::IsClosed(edge, face))
				continue;

			if (std::find_if(written_edges.begin(), written_edges.end(), [&edge](auto& other) { return other.IsEqual(edge); }) != written_edges.end())
				continue;

			written_edges.emplace_back(edge);

			BRepAdaptor_Curve adapt_crv = BRepAdaptor_Curve(edge);
			auto type = adapt_crv.GetType();

			GCPnts_TangentialDeflection discretizer(adapt_crv, 0.5, 0.1);
			if (discretizer.NbPoints() > 1)
			{
				for (int i = 2; i <= discretizer.NbPoints(); ++i)
				{
					gp_Pnt p_0 = discretizer.Value(i - 1);
					gp_Pnt p_1 = discretizer.Value(i);

					dxf_writer.addLine(0, nullptr, Wm5::Vector3d(p_0.X(), p_0.Y(), p_0.Z()), Wm5::Vector3d(p_1.X(), p_1.Y(), p_1.Z()));
					++count_writes;
				}
			}
			//BRepMesh_CurveTessellator crv_tess(adapt_crv,);
		}
	}
}