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Sams Teach Yourself C++ in One Hour a Day, Sixth Edition by Bradley Jones, Siddhartha Rao, Jesse Liberty

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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 ...

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