Signals and slots use the event loop, so I would't consider them synchronous.
You can easily achieve async behavior.
Like in this case, do a network request and then notify me when its done,
QNetworkReply *reply = manager->get(QUrl("http://foo.com";));
connect(reply, SIGNAL(finished()), this, SLOT(some_slot()) );
Same with future, promise, you can achieve both async and sync behavior, its
really up to caller to decide. I often use future/promise just to limit a
particular operation on a server to only a couple threads. The end result is
people call a completely synchronous function.
It seems like this pattern is just a poor mans version of something that
already exists. I guess my confusion comes from all the time/energy your
putting into documenting it.
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