VMS Help CXXLSTD, Algorithms, equal_to *Conan The Librarian |
Standard C++ Library Copyright 1996, Rogue Wave Software, Inc. NAME equal_to - 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) will contain 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> { typedef typename binary_function<T, T, bool>::second_argument_type second_argument_type; typedef typename binary_function<T, T, bool>::first_argument_type first_argument_type; typedef typename binary_function<T, T, bool>::result_type result_type; SEE ALSO bool operator() (const T&, const T&) const; }; binary_function, function objects STANDARDS CONFORMANCE ANSI X3J16/ISO WG21 Joint C++ Committee
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