Callback
“callback function - one whose address is supplied for the purpose of being invoked when some anticipated event occurs. Opaque enums (669)” (EMCppSfe 2021)
- Snippet from Wikipedia: Callback (computer programming)
In computer programming, a callback is a function that is stored as data (a reference) and designed to be called by another function – often back to the original abstraction layer.
A function that accepts a callback parameter may be designed to call back before returning to its caller which is known as synchronous or blocking. The function that accepts a callback may be designed to store the callback so that it can be called back after returning which is known as asynchronous, non-blocking or deferred.
Programming languages support callbacks in different ways such as function pointers, lambda expressions and blocks.
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