Difference between revisions of "cpp/utility/functional/bit not"
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< cpp | utility | functional
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| − | Although {{tt|std::bit_not}} | + | Although {{tt|std::bit_not}} is added via post-C++11 proposal {{wg21|N3421}}, it is treated as a part of the resolution for {{lwg|660}} (except for its transparent specialization {{c|std::bit_not<>}}) by common implementations, and thus available in their C++98/03 mode. |
{{langlinks|de|es|fr|it|ja|pt|ru|zh}} | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Revision as of 20:28, 12 August 2021
| Defined in header <functional>
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| template< class T = void > struct bit_not; |
(since C++14) | |
Function object for performing bitwise NOT. Effectively calls operator~ on type T.
Contents |
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.
| (C++14) |
function object implementing ~x deducing parameter and return types (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 std::unary_function<T, T>. |
(until C++11) |
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.
