void tick(const Msp::Time::TimeStamp &, const Msp::Time::TimeDelta &);
void save(std::list<Msp::DataFile::Statement> &) const;
private:
void tick(const Msp::Time::TimeStamp &, const Msp::Time::TimeDelta &);
void save(std::list<Msp::DataFile::Statement> &) const;
private: