Avoiding time_point and duration dependency on time.h and CLOCK_REALTIME

[1czajnik@…]

Hello,

The file chrono/config.hpp enforces that time.h defines CLOCK_REALTIME:

# if defined( BOOST_CHRONO_POSIX_API )
#   define BOOST_CHRONO_HAS_PROCESS_CLOCKS
#   include <time.h>  //to check for CLOCK_REALTIME and CLOCK_MONOTONIC and _POSIX_THREAD_CPUTIME
#   if defined(CLOCK_REALTIME)
#     if defined(CLOCK_MONOTONIC)
#        define BOOST_CHRONO_HAS_CLOCK_STEADY
#     endif
#   else
#     error <time.h> does not supply CLOCK_REALTIME
#   endif
...
# endif

It seems that files: chrono/duration.hpp and chrono/time_point.hpp don't need to depend on <time.h> or CLOCK_REALTIME. If a compiler provides a <time.h>, which doesn't define CLOCK_REALTIME, or even doesn't provide <time.h>, it would be nice to still be able to use chrono/duration.hpp or chrono/time_point.hpp.

Regards, Kris

[1czajnik@…]

As a workaround, I was able to use time_point.hpp and duration.hpp by defining CLOCK_REALTIME in my project. Of course, I am not using any clocks provided by Chrono.

[viboes]

Please, could you tell me if the attached patch 7042.2.patch solves the issue with CLOCK_REALTIME?

[1czajnik@…]

Yes, I confirm, patch 7042.2.patch solves the issue with CLOCK_REALTIME.

Cheers, Kris

[viboes]

Committed revision 79371.