A slot is a narrow opening in which something can fit. (Also: hole, slit, notch, gap, vent, etc.) He dropped the coin in the slot and dialed.
In the movie National Lampoon’s Vegas Vacation, Chevy Chase’s character wins four cars by playing the slot machine. The movie has a lot to do with luck and chance, but there’s a real science behind winning at the slot machine. The secret to winning is understanding probability and avoiding myths like the one that says you should play all the coins in order to increase your chances of hitting the jackpot.
If you want to win, you have to look for a game with high Return to Player rates and low variance. You can find this information by reading online reviews and checking the developer’s website. However, you should always use multiple sources to make sure that the information is correct.
Slots are a powerful component programming mechanism in Qt. They’re normal member functions, so an object does not know if anything has connected to it; only the class that defines it knows. In general, emitting a signal with slots connected is about ten times slower than not using them, but this is only because the slots add a little overhead to locate and iterate over all connections. The overhead is still less than that of a new or delete operation, for example.