equal_to

Function Object

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

None

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

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).

template <class T>
    struct equal_to : binary_function<T, T, bool> 

binary_function, Function Objects