Timing macros for runtime measurements

#include <vigra/timing.hxx>

These macros allow to perform execution speed measurements. Results are reported in milliseconds. However, note that timings below 1 msec are generally subject to round-off errors. Under LINUX, you can #define VIGRA_HIRES_TIMING to get better accuracy, but this requires linking against librt.

Basic usage:

void time_it()
{
    USETICTOC

    TIC
     ...    code to be timed
    TOC
     ...    untimed code
    TIC
     ...    other code to be timed
    TOC
}

Instead of TOC, which outputs the time difference to std::cerr, you may use TOCN (the time difference in msec as a double) or TOCS (the time difference as a std::string).

Alternatively, you can perform nested timing like so:

void time_it()
{
    USE_NESTED_TICTOC

    TICPUSH
     ...         code to be timed
        TICPUSH
         ...         nested code to be timed
        TOC          print time for nested code
     ...         more code to be timed
    TOC          print total time
}