bool operator<(const TimeStamp &t) const { return usec<t.usec; }
bool operator==(const TimeStamp &t) const { return usec==t.usec; }
bool operator!=(const TimeStamp &t) const { return usec!=t.usec; }
bool operator<(const TimeStamp &t) const { return usec<t.usec; }
bool operator==(const TimeStamp &t) const { return usec==t.usec; }
bool operator!=(const TimeStamp &t) const { return usec!=t.usec; }