Standard C++ Library
Copyright 1998, Rogue Wave Software, Inc.

NAME

 
equal_to
 
 - A binary function object that returns true if its first argument equals its second. 
 
 
 

SYNOPSIS

 
 
#include <functional>
template <class T>
struct equal_to;
 
 
 

DESCRIPTION

 
 
equal_to is a binary function object. Its operator() returns true if x is equal to y. You can pass an equal_to object to any algorithm that requires a binary function. For example, the transform algorithm applies a binary operation to corresponding values in two collections and stores the result.   equal_to would be used in that algorithm in the following manner:
 
 
vector<int> vec1;
vector<int> vec2;
vector<int> vecResult;
transform(vec1.begin(), vec1.end(),

vec2.begin(), vecResult.begin(),

equal_to<int>());

 
After this call to transform, vecResult(n) contains a 1 if vec1(n) was equal to vec2(n) or a 0 if vec1(n) was not equal to vec2(n). 
 
 
 

INTERFACE

template <class T>

struct equal_to : binary_function<T, T, bool>
 
 
 

SEE ALSO

 
 
binary_function, Function_Objects
 

Rogue Wave Software  —  Last change: 02 Apr 1998