function.h.
Template parameters | Parameter | Description |
T | The type of logical_or'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_or() | Default Constructible | The default constructor. |
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.
Category: functors
Component type: type
Description Logical_not<T> is a function object; specifically, it is an Adaptable 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_not<T> and x is an object of class T (where T is convertible to bool) then f(x) returns true if and only if x is false.
Example Transforms a vector of bool into its logical complement.
vector<bool> V;
…
transform(V.begin(), V.end(), V.begin(), logical_not<bool>());
Definition Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.
Template parameters | Parameter | Description |
T | The type of logical_not's argument |
Model of Adaptable Predicate, DefaultConstructible
Type requirements T must be convertible to bool.
