** Cylinder-Torus Unite > non-G1 and overlapping edges **

// Load torus and cylinder solids.
TopoDS_Shape torusShp;
BRep_Builder builder;
BRepTools::Read(torusShp, "torus.brep", builder);

TopoDS_Shape cylinderShp;
BRepTools::Read(cylinderShp, "cylinder.brep", builder);

TopTools_ListOfShape targetShpList;
targetShpList.Append(torusShp);

TopTools_ListOfShape toolShpList;
toolShpList.Append(cylinderShp);

// Perform boolean.
BRepAlgoAPI_Fuse bop;
bop.SetArguments(targetShpList);
bop.SetTools(toolShpList);
bop.SetFuzzyValue(tolerance);
bop.SetNonDestructive(Standard_True);
bop.SetUseOBB(Standard_True);
bop.Build();

if (bop.HasErrors()) {
  Handle(Message_Report) msgReport = bop.GetReport();
  const Message_ListOfAlert &msgList = msgReport->GetAlerts(Message_Info);
}

Standard_Boolean success = bop.IsDone();