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std::bit_not

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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.

Contents

[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 argument 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

These member types are obtained via publicly inheriting std::unary_function<T, T>.

(until C++11)

[edit] Member functions

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

std::bit_not::operator()

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

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.