Timespan calculations

[Clive]

Hi,
I'm hoping someone can help -
I want to see how long some code is taking to execute, & then print out the result.
Do I have to use GetSystemTime twice & then do some maths?
So example code wuold be great.

Thanks in advance,
Clive

 

[John Harrison]

Hi,
I'm hoping someone can help -
I want to see how long some code is taking to execute, & then print out the result.
Do I have to use GetSystemTime twice & then do some maths?

GetSystemTime is not a standard C++ function.

So example code wuold be great.

#include <time.h>

time_t t0 = time(0);
/* some long calculation */
time_t t1 = time(0);
double time_in_seconds = difftime(t1, t0);

Thanks in advance,
Clive

Its usually better to use standard functions, time_t, time and difftime are
all standard functions which will be available on any platform with a
standard C or C++ compiler.

john

 

[Kevin Goodsell]

Its usually better to use standard functions, time_t, time and difftime are
all standard functions which will be available on any platform with a
standard C or C++ compiler.

But the resolution of those might be too low to be useful for code
timing. Better to use a real profiler, I'd say.

-Kevin

 

[Clive]

That's great - exactly what I was looking for.
Thanks!

Clive