Useful time of the class

Very often, a piece of code we need to calculate the time-consuming operation, we often write:

The first case, to the millisecond.

clock_t start = null, end = null;

double duration = 0;

start = clock ();

/ / Operation statements here

end = clock ();

duration = (double) (end - start) / CLOCK_PER_SEC;

Second case, accurate to seconds.

time_t start = null, end = null;

int duration = 0;

start = time (NULL);

/ / Operation statements here

end = time (NULL);

duration = end - start;

Is the time to code in C + + projects can be reused, we can to package.

The scope of the object to the use of computing time. Of course, these classes can only be used in certain occasions.

class TimeCost

(

public:

TimeCost () (m_cur = time (NULL);

~ TimeCost ()

(

time_t cur = time (NULL);

prinftf ("Time cost is% d s
", Cur - m_cur;

)

private:

time_t m_cur;

)



class TimeCost2

(

public:

TimeCost2 () (m_cur = clock ();)

~ TimeCost2 ()

(

clock_t cur = clock ();

double cost = (double) (cur - m_cur) / CLOCK_PER_SEC;

printf ("Time cost:% f s
", Cost);

)

private:

clock_t m_cur;

)

Of course, the biggest drawback of these two classes is the strict calculation of time depends on the object's lifetime.






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