See Fortran Callbacks

• callback function - “A function (A) that is sent as an input to another function (B) so that function B can call function A over the course of its operation. For example, generalized sort functions typically take as input a function to compare two elements.” (21cC 2014)

• “callback function - one whose address is supplied for the purpose of being invoked when some anticipated event occurs. Opaque enums (669)” (EMCppSfe 2021)

Also called callback

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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