Standard C++ Library Class Reference

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Function Objects

Summary

Objects with an operator() defined. Function objects are used in place of pointers to functions as

arguments to templated algorithms.

Contents

Synopsis●

Description●

Interface●

Example●

Warnings●

See Also●

Synopsis

#include<functional>

// typedefs

template <class Arg, class Result>

struct unary_function;

template <class Arg1, class Arg2, class Result>

struct binary_function;

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

C++ 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.