Function Object

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/ˈfəŋkʃən ˈɑbʤɛkt/

Any function object that is a class attribute defines a method for instances of that class.
This type of object is known as a functor or function object.
Methods also support accessing ( but not setting ) the arbitrary function attributes on the underlying function object.
Notice that then, in the body of the loop, I use callback to invoke the passed parameter function object.
So far, to use custom comparison functions, the standard practice has been to define your own function object and then define the operator () appropriately.

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