Testing the "after" pattern of actor-framework

caf_timeout.cc

#include <caf/all.hpp>
#include <unistd.h>
#include <sys/time.h>

using namespace std;
using namespace caf;

double now()
    {
    struct timeval tv;
    gettimeofday(&tv, 0);
    return tv.tv_sec + (tv.tv_usec / 1000000.0);
    }

behavior eager_actor(event_based_actor* self) 
    {
    double creation_time = now();
    return {
    [=](int i)
        { 
        aout(self) << "after " << now() - creation_time << " seconds, "
                   << "got " << i << endl;
        },
    [](float i) 
        { /* ... */ },
    others() >> []
        { /* ... */ },
    after(std::chrono::seconds(5)) >> [=]
        {
        aout(self) << "after " << now() - creation_time << " seconds, "
                   << "timeout (received nothing within 5 seconds)" << endl;
        }
    };
}

int main()
    {
    auto a1 = spawn(eager_actor);
    sleep(2);
    anon_send(a1, 999);
    await_all_actors_done();
    return 0;
    }