a timer using boost

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class Timer {     typedef boost::chrono::high_resolution_clock system_timer;     typedef boost::chrono::duration<double> time_duration; public:     Timer() : m_begin(system_timer::now()) {}           double  getElapsed() const {         return boost::chrono::duration_cast<time_duration>(system_timer::now() - m_begin).count();     }     void reset() {         m_begin = system_timer::now();     } protected:     system_timer::time_point m_begin; };