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std::not_equal_to(3)	       C++ Standard Libary	    std::not_equal_to(3)

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

Member types
	Type							     Definition
	result_type (deprecated in C++17)(removed in C++20)	     bool
	first_argument_type (deprecated in C++17)(removed in C++20)  T
	second_argument_type (deprecated in C++17)(removed in C++20) T

	These	member	 types	 are   obtained    via	  publicly    inheriting
     (until C++11)
	std::binary_function<T, T, bool>.

Member functions
	operator() checks if the arguments are not equal
		   (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
	May throw implementation-defined exceptions.

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

See also
	equal		     determines if two sets of elements are the same
			     (function template)
	less		     function object implementing x < y
			     (class template)
	ranges::not_equal_to constrained function object implementing x != y
	(C++20) 	     (class)

http://cppreference.com 	   2024.06.10		    std::not_equal_to(3)
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