c++時間度量輔助類

#ifndef __TIME_MEASURE_H#define __TIME_MEASURE_H#include <sys/time.h>class time_measure{ public:  /**   * Get the current time   */  time_measure();  /**   * Calculate the time range(microseconds,i.e.10e-6 second)    * and reset the tv_ to current time   */  long int time_range(); private:  timeval tv_;};#endif

#include "time_measure.h"time_measure::time_measure(){  gettimeofday(&tv_,0);}long int time_measure::time_range(){  timeval tv;  gettimeofday(&tv,0);  long int diff = (tv.tv_sec-tv_.tv_sec)*1000000+(tv.tv_usec-tv_.tv_usec);  gettimeofday(&tv_,0);  return diff;}

調用代碼很簡單：

class test{public:  void print(){    cout<<"print OK"<<endl;  }};int main(){  time_measure t;  my_application& my_app = my_application_singleton_holder::Instance();  my_app.insert_property("test",shared_ptr<test>(new test));  any a = my_app.get_property("test");  any_cast<shared_ptr<test> >(a)->print();  cout<<"time is:"<<t.time_range()<<" microseconds"<<endl;}