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std::bit_not

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

Function object for performing bitwise NOT. Effectively calls operator~ on type T.

Specializations

The standard library provides a specialization of std::bit_not when T is not specified, which leaves the parameter types and return type to be deduced.

bit_not<void>

(C++14)

function object implementing ~x deducing argument and return types
(class template specialization)

Member types

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

Member functions

operator()

(C++14)

returns the result of bitwise NOT of its argument
(public member function)

std::bit_not::operator()

constexpr T operator()( const T& arg ) const;

(since C++14)

Returns the result of bitwise NOT of arg.

Parameters

arg

value to compute bitwise NOT of

Return value

The result of ~arg.

Exceptions

May throw implementation-defined exceptions.

Possible implementation

constexpr T operator()(const T& arg) const
{
    return ~arg;
}

Notes

Although std::bit_not is added via post-C++11 proposal N3421, it is treated as a part of the resolution for LWG issue 660 (except for its transparent specialization std::bit_not<>) by common implementations, and thus available in their C++98/03 mode.

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https://en.cppreference.com/w/cpp/utility/functional/bit_not