Lesson 21. 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 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 implement
operator(). Although functions and function-pointers can also be classified as function objects, it is the capability of an object of a class that ...