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logical_or<T>

logical_or<T> DescriptionLogical_or<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_or<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 either x or y is true. [1] Example Finds the first instance of either ' ' or '\n' in a string. 
char str[MAXLEN];
...
const char* wptr = find_if(str, str + MAXLEN,
                           compose2(logical_or<bool>(),
                                    bind2nd(equal_to<char>(), ' '),
                                    bind2nd(equal_to<char>(), '\n')));
assert(wptr == str + MAXLEN || *wptr == ' ' || *wptr == '\n');
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_or's arguments   Model ofAdaptable Binary Predicate, DefaultConstructible Type requirementsT must be convertible to bool. Public base classesbinary_function<T, T, bool> Members New members All of logical_or's members are defined in the Adaptable Binary Function and Default Constructible requirements. Logical_or 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_and, logical_not. STL Main Page

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