std::bit_not - cppreference.com (original) (raw)

| | | | | --------------------------------------------- | | ------------- | | template< class T = void > struct bit_not; | | (since C++14) |

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

Contents

• 1 Specializations
• 2 Member types
• 3 Member functions
• 4 std::bit_not::operator()
  • 4.1 Parameters
  • 4.2 Return value
  • 4.3 Exceptions
  • 4.4 Possible implementation
  • 4.5 Notes

[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

[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

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.