std::not_equal_to (3) - Linux Manuals

std::not_equal_to: std::not_equal_to

NAME

std::not_equal_to - std::not_equal_to

Synopsis

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

Function object for performing comparisons. Unless specialised, invokes operator!= on type T.

Specializations

The standard library provides a specialization of std::not_equal_to when T is not specified, which leaves the parameter types and return type to be deduced.

                   function object implementing x != y deducing argument and return types (since C++14)
not_equal_to<void> (class template specialization)

Member types

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

Member functions

           checks if the arguments are not equal
operator() (public member function)

 std::not_equal_to::operator()

bool operator()( const T& lhs, const T& rhs ) const; (until C++14)
constexpr bool operator()( const T& lhs, const T& rhs ) const; (since C++14)

Checks whether lhs is not equal to rhs.

Parameters

lhs, rhs - values to compare

Return value

true if lhs != rhs, false otherwise.

Exceptions

(none)

Possible implementation

  constexpr bool operator()(const T &lhs, const T &rhs) const
  {
      return lhs != rhs;
  }