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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.

 function object implementing ~x deducing argument and return types
(class template specialization)
(since C++14)

Member types

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

(none).

Possible implementation

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

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