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Standard Template Library Programmer's Guide
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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	Default
`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.