logical_and<T> logical_and<T> Category: functors Component type: type Description Logical_and<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 logical_and<T> and x and y are objects of class T (where T is convertible to bool) then f(x,y) returns true if and only if both x and y are true. [1] Example Finds the first element in a list that lies in the range from 1 to 10. list<int> L; ... list<int>::iterator in_range = find_if(L.begin(), L.end(), compose2(logical_and<bool>(), bind2nd(greater_equal<int>(), 1), bind2nd(less_equal<int>(), 10))); assert(in_range == L.end() || (*in_range >= 1 && *in_range <= 10)); 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 logical_and's arguments   Model of Adaptable Binary Predicate, DefaultConstructible Type requirements T must be convertible to bool. Public base classes binary_function<T, T, bool> Members Member Where defined Description first_argument_type Adaptable Binary Function The type of the first argument: T second_argument_type Adaptable Binary Function The type of the second argument: T result_type Adaptable Binary Function The type of the result: bool bool operator()(const T& x, const T& y) const Binary Function Function call operator. The return value is x && y. logical_and() Default Constructible The default constructor. New members All of logical_and's members are defined in the Adaptable Binary Function and Default Constructible requirements. Logical_and does not introduce any new members. Notes [1] Logical_and and logical_or are not very useful by themselves. They are mainly useful because, when combined with the function object adaptor binary_compose, they perform logical operations on other function objects. See also The function object overview, logical_or, logical_not. Copyright © 1999 Silicon Graphics, Inc. All Rights Reserved. TrademarkInformation