学步园

#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;
}

调用代码很简单：

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;
}