Standard C++ Library Class Reference

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unary_function
Function Object
Summary
Base class for creating unary function objects.
Contents
Synopsis●
Description●
See Also●
Synopsis
#include <functional>
template <class Arg, class Result>
struct unary_function{
typedef Arg argument_type;
typedef Result result_type;
};
Description
Function objects are objects with an operator() defined. They are important for the effective use
of the standard library's generic algorithms, because the interface for each algorithmic template
can accept either an object with an operator() defined or a pointer to a function. The standard
library provides both a standard set of function objects, and a pair of classes that you can use as
the base for creating your own function objects.
Function objects that take one argument are called unary function objects. Unary function
objects are required to provide the typedefs argument_type and result_type. The