std::logical_not (3) - Linux Man Pages

std::logical_not: std::logical_not

NAME

std::logical_not - std::logical_not

Synopsis


Defined in header <functional>
template< class T > (until C++14)
struct logical_not;
template< class T = void > (since C++14)
struct logical_not;


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 (since C++14)
logical_not<void> (class template specialization)

Member types


                                              (until C++20)
Type Definition
result_type(deprecated in C++17) bool
argument_type(deprecated in C++17) T

Member functions


           returns the logical NOT of the argument
operator() (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;
  }