static bool compare_trace_v_offsets(
const boost::shared_ptr<pv::view::Trace> &a,
const boost::shared_ptr<pv::view::Trace> &b);
static bool compare_trace_v_offsets(
const boost::shared_ptr<pv::view::Trace> &a,
const boost::shared_ptr<pv::view::Trace> &b);