An abstract class serving as an interface contains only pure virtual functions, and no data members or ordinary methods.

The C standard library contains several functions for numeric conversions.

It contains functions for interacting with an X server.

Additionally, the system includes extensions, which contain individual functions.

Element management layer: contains functions for the handling of individual network elements.

Each stream category contains specific messages, or functions, also identified by an integer between 0 and 255.

The menu will also contain functions providing the activities and constraints necessary to comply with the company's codes of practice or "house style".

These equations contain only functions of time; this is a condition that has to be fulfilled in all homogeneous spaces.

A dialog box or a menu is a presentation of a complex object containing properties and functions.

Each division within a divisional structure contains all the necessary resources and functions within it.