std::logical_not
Defined in header <functional> |
||
---|---|---|
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
|
(since C++14) |
Member types
Type | Definition |
---|---|
result_type (deprecated in C++17)(removed in C++20) |
bool |
argument_type (deprecated in C++17)(removed in C++20) |
T |
These member types are obtained via publicly inheriting |
(until C++11) |
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
May throw implementation-defined exceptions.
Possible implementation
constexpr // since C++14 bool operator()(const T &arg) const { return !arg; } |
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