Slots in C++

A slot is a narrow notch or other narrow opening, especially one for receiving something, such as a coin in a vending machine. A slot may also refer to:

Slot – Sports

In American football, a wide receiver is described as a player in the “slot” position. This is an area close to the line of scrimmage, between the offensive and defensive lines, that is ideal for a quick receiver who can cause mismatches against safeties or linebackers. Adding a slot receiver to a team forces the defense to build nickel or dime formations, which can help limit their chances of a big play.

In a slot, the template fragment’s content is rendered by calling the function with props. Since slots are normal member functions, they can be invoked with normal C++ signal-slot connections – a function emitted by an instance of one class can trigger a private slot in an instance of another class, regardless of the class’ access level. This is useful in cases where a component wants to encapsulate reusable logic (data fetching, pagination etc.), but delegate some of the visual output to a consumer via scoped slots. The FancyList> use case discussed in the Render Scope article is an example of this. The name of a slot can be shortened with the dedicated shorthand template v-slot:header>, to be more concise, but the slot function will still need access to its parent’s state. This can be accomplished with a v-slot directive’s childProps attribute, or more commonly, a custom props argument passed to the slot by its parent component.