What is a Slot?


Slot is a narrow opening in something. It is used to receive something, or to pass things from one place to another. A slot can also be a position or sequence in something, such as a job opening or assignment. Airplane wings feature slots for improved air flow. These slots can be narrow or wide, and can be made of metal, plastic, or glass.


When you play slot machines, you’ll encounter a wide array of symbols. While you probably can’t make out their meaning, they represent things like bubblegum flavors. There’s no deeper secret to these symbols, and you’ll find them on both land-based and online machines.


The word slot is used to refer to a specific opening, job or assignment. For example, a newspaper slot represents a particular position. In an airplane, a pilot is authorized to fly in a specific slot, depending on the authorization of the air traffic authority and airport. The word slot is used in a variety of contexts and has many grammatical meanings.


The cost of a slot machine is often calculated in terms of its revenue. For example, if Slot Machine A is a game that generates $355 per day, the cost of that machine would be $31,950 over ninety days. The difference between this figure and the actual performance of a slot machine is $2,610. This downtime is often considered when justifying the removal of a machine from the slot floor.

Function call

A slot function call is used to change the value of a slot within an object class. The new value is returned in slotNames, and it must be valid for the slot in the object class. The slotValidity flag is used to verify the validity of the value assigned to the slot. In user code, it is not safe to set this flag to FALSE.

Qt signals and slots

Qt signals and slots are language constructs that provide a simple way to communicate between objects. They make the observer pattern extremely easy to implement without a lot of boilerplate code.