equal_to<T> equal_to<T> Category: functors Component type: type Description Equal_to<T> is a function object. Specifically, it is an Adaptable Binary Predicate, which means it is a function object that tests the truth or falsehood of some condition. If f is an object of class equal_to<T> and x and y are objects of class T, then f(x,y) returns true if x == y and false otherwise. Example Rearrange a vector such that all of the elements that are equal to zero precede all nonzero elements. vector<int> V; ... partition(V.begin(), V.end(), bind2nd(equal_to<int>(), 0)); Definition Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h. Template parameters Parameter Description Default T The type of equal_to's arguments.   Model of Adaptable Binary Predicate, DefaultConstructible Type requirements T is EqualityComparable. Public base classes binary_function<T, T, bool>. Members Member Where defined Description first_argument_type Adaptable Binary Predicate The type of the first argument: T second_argument_type Adaptable Binary Predicate The type of the second argument: T result_type Adaptable Binary Predicate The type of the result: bool equal_to() DefaultConstructible The default constructor. bool operator()(const T& x, const T& y) Binary Function Function call operator. The return value is x == y. New members All of equal_to's members are defined in the Adaptable Binary Predicate and DefaultConstructible requirements. Equal_to does not introduce any new members. Notes See also The function object overview, Adaptable Binary Predicate, not_equal_to, greater, less, greater_equal, less_equal Copyright © 1999 Silicon Graphics, Inc. All Rights Reserved. TrademarkInformation