void fire(AsyncCall func, Args&& ... args) const noexcept(false) {
if (empty()) {
throw std::runtime_error("nullptr instantiated worker");
}
// weak compiler support for expanding parameter pack in a lambda. std::function is the
// work-around, With better compiler support it can be changed to:
// auto bgCall = [&, args...]{ return (_worker.*func)(args...); };
auto bgCall = std::bind(func, _worker.get(), std::forward<Args>(args)...);
_q.push(bgCall);
return;
}
/**
* Clean shutdown. All pending messages are executed before the shutdown message is received
*/
virtual ~concurrent() {
_q.push([ = ] {_done = true;});
if (_thd.joinable()) {
_thd.join();
}
}
~concurrent() {
_q.push([ = ]{_done = true;});
_thd.join();
}