NAME¶

std::bit_not - std::bit_not

Synopsis¶

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

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> function object implementing ~x deducing argument and return types
(C++14) (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

These member types are obtained via publicly inheriting (until C++11)
std::unary_function<T, T>.

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.

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.