Книга: Standard Template Library Programmer
logical_not
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logical_not<T>
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.
Public base classes
unary_function<T, bool>
Members
| Member | Where defined | Description |
|---|---|---|
argument_type |
Adaptable Unary Function | The type of the second argument: T |
result_type |
Adaptable Unary Function | The type of the result: bool |
bool operator()(const T& x) const |
Unary Function Function call operator. | The return value is !x. |
logical_not() |
Default Constructible | The default constructor. |
See also
The function object overview, logical_or, logical_and.
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