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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../utility/functional/bit_not.html below:

std::bit_not - cppreference.com

template< class T = void > struct bit_not;

(since C++14)

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

[edit] 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.

function object implementing ~x deducing parameter and return types
(class template specialization) [edit] [edit] 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 [edit] Member functions 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.

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

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

[edit] 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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