class FooSource : Source {
	public override bool prepare (out int timeout) {
		timeout = 1000;
		return false;
	}

	public override bool check () {
		return false;
	}

	public override bool dispatch (SourceFunc? callback) {
		return false;
	}
}

class BarSource : Source {
	public int custom_timeout;

	public BarSource (int timeout) {
		custom_timeout = timeout;
	}

	public override bool prepare (out int timeout) {
		timeout = custom_timeout;
		return false;
	}

	public override bool check () {
		return false;
	}

	public override bool dispatch (SourceFunc? callback) {
		return false;
	}
}

class ManamSource : Source {
	public override bool dispatch (SourceFunc? callback) {
		return false;
	}
}

void main () {
	var foo = new FooSource ();
	var bar = new BarSource (1000);
	var manam = new ManamSource ();
}