Callback (computer programming): Difference between revisions

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{{Short description |A function reference passed to and called by another function}}

{{For |a discussion of callback with computer [[modem]]smodems |Callback (telecommunications)}}

{{More references |date=September 2015}}

[[File:Callback-notitle.svg|thumb|370px|A callback is often back on the level of the original caller.]]

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=== Event handling ===

A callback can be used for event handling. Often, consuming code registers a callback for a particular type of event. When that event occurs, the callback is called. Callbacks are often used to program the [[graphical user interface]] (GUI) of a program that runs in a [[windowing system]]. The application supplies a reference to a custom callback function for the windowing system to call. The windowing system calls this function to notify the application of events like [[computer mouse|mouse]] clicks and [[computer keyboard|key]] presses.

=== Asynchronous action ===