std:: bit_not

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Function objects
Function invocation
(C++17) (C++23)
Identity function object
(C++20)
Old binders and adaptors
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( until C++17* )
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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.

(C++14)
function object implementing ~x deducing parameter 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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