std::logical_not

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Defined in header`<functional>`
template<class T> struct logical_not;		(until C++14)
template<class T=void> struct logical_not;		(since C++14)

Function object for performing logical NOT (logical negation). Effectively callsoperator! for typeT.

[edit]Specializations

The standard library provides a specialization ofstd::logical_not whenT is not specified, which leaves the parameter types and return type to be deduced.

logical_not<void>

(C++14)

function object implementing!x deducing parameter and return types
(class template specialization)[edit]

(since C++14)

[edit]Member types

Type	Definition
`result_type`(deprecated in C++17)(removed in C++20)	bool
`argument_type`(deprecated in C++17)(removed in C++20)	`T`

These member types are obtained via publicly inheritingstd::unary_function<T,bool>.

(until C++11)

[edit]Member functions

operator()

returns the logical NOT of the argument
(public member function)

std::logical_not::operator()

bool operator()(const T& arg)const;		(constexpr since C++14)

Returns the logical NOT ofarg.

Parameters

arg

value to compute logical NOT of

Return value

The result of!arg.

[edit]Exceptions

May throw implementation-defined exceptions.

Possible implementation

constexpr// since C++14bool operator()(const T& arg)const{return!arg;}

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std::logical_not

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[edit]Member functions

std::logical_not::operator()

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