std::logical_not
< cpp | utility | functional
Defined in header <functional>
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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
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(since C++14) |
Member types
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(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; } |