A simple demonstration of using the event system

#include <iostream>
#include <string>
#include <vector>
// A condition that we'll use in this example to signal the main
// thread that the worker has processed the event.
// Define a new event.
// The event is uniquely identified via the incomplete my_event_type struct and
// has two arguments: A string and a vector of ints.
struct my_event_type;
// A simple event handler
class handler final : public fz::event_handler
handler(fz::event_loop& l)
: fz::event_handler(l)
virtual ~handler()
// This _MUST_ be called to avoid a race so that operator()(fz::event_base const&) is not called on a partially destructed object.
// The event loop calls this function for every event sent to this handler.
virtual void operator()(fz::event_base const& ev)
// Dispatch the event to the correct function.
fz::dispatch<my_event>(ev, this, &handler::on_my_event);
void on_my_event(std::string const& s, std::vector<int> const& v)
std::cout << "Received event with text \"" << s << "\" and a vector with " << v.size() << " elements" << std::endl;
// Signal the condition
fz::scoped_lock lock(m);
int main()
// Start an event loop
// Create a handler
handler h(l);
// Send an event to the handler
h.send_event<my_event>("Hello World!", std::vector<int>{23, 42, 666});
// Wait until a signal from the worker thread
fz::scoped_lock lock(m);
// All done.
return 0;