
ALINK="#ff0000">
logical_and<T>
DescriptionLogical_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]ExampleFinds 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)); DefinitionDefined in the standard header functional, and in the nonstandard backwardcompatibility header function.h.Template parameters
Model ofAdaptable Binary Predicate, DefaultConstructibleType requirementsT must be convertible to bool.Public base classesbinary_function<T, T, bool>Members
New membersAll 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 alsoThe function object overview, logical_or, logical_not.Copyright © 1999 Silicon Graphics, Inc. All Rights Reserved. TrademarkInformation
