Chapter 22. Understanding Function Objects
Function objects or functors might sound exotic or intimidating, but they are entities of C++ that you have probably seen if not also used, without having realized it. In this lesson, you will learn
The concept of function objects
The usage of function objects as predicates
How unary and binary predicates are implemented using function objects
The Concept of Function Objects and Predicates
On a conceptual level, function objects are objects that work as functions. On an implementation level, however, function objects are objects of a class that implements
operator(). Although functions and function-pointers can also be classified as function objects, it is the capability of an object of a class that implements ...