std::logical_not
template< class T >
struct logical_not;
| | (until C++14) |
template< class T = void >
struct logical_not;
| | (since C++14) |
Function object for performing logical NOT (logical negation). Effectively calls operator! for type T.
Specializations
| The standard library provides a specialization of std::logical_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) | bool |
argument_type(deprecated in C++17) | T |
| (until C++20) |
Member functions
| operator() | returns the logical NOT of the argument
(public member function) |
std::logical_not::operator()
bool operator()( const T& arg ) const;
| | (until C++14) |
constexpr bool operator()( const T& arg ) const;
| | (since C++14) |
Returns the logical NOT of arg.
Parameters
| arg | - | value to compute logical NOT of |
Return value
The result of !arg.
Exceptions
(none).
Possible implementation
const bool operator()(const T &arg) const
{
return !arg;
} |