A slot is an area, usually a narrow opening, containing something. This can be a keyway in machinery or a slit for a coin in a vending machine.

Slot-based scheduling is an organizational method that can help improve team productivity and workflow. It can be used by health care professionals and financial consultants. They can use it to set important deadlines, allocate resources and track progress. Using slot-based scheduling can improve staff awareness, motivation and communication.

Slot-based scheduling can be used to ensure that teams and staff members are working on the right tasks at the right time. It can also be used for organizing informal meetings and evaluation reviews.

When using slots, it is important to use the correct context object. If the receiver is not in the proper thread, the slot will report a runtime error.

A slot’s signal-slot connection is very slow, about ten times slower than calling the receiver directly. However, this is not the only downside. Assuming that the slot knows whether the signal is connected to it, it will delay the processing of the connection, but it is much less costly than performing an operation.

Slots can be defined to be virtual, and when called directly they follow normal C++ rules. The main difference is that the SLOT signature must not have fewer arguments than the SIGNAL signature.

Using the QObject::connect() function will connect the receiver to the slot. Using the QObject::connect() overload does not check whether the slot supports the arguments.