A simple macro to time execution of a block of code.

timeit.cpp

#include <boost/timer/timer.hpp>

struct timeit_obj
{
    template <typename F>
    auto operator+(F && func) -> decltype(func()) const
    {
        boost::timer::auto_cpu_timer t;
        return func();
    }
};

#define timeit \
    timeit_obj() + [&]

int main(int argc, char * argv[])
{
    char const * cmd = "ls";
    if (argc > 1)
        cmd = argv[1];

    auto err = timeit { return system(cmd); };
    return err;
}