// 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();