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

NAME
     std::negate - std::negate

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

	Function  object for performing negation. Effectively calls operator- on
     an instance
	of type T.

Specializations
	The standard library provides a specialization of std::negate when T
	is not specified, which leaves the parameter types and return type to
	be deduced.
									       (since
     C++14)
	negate<void> function object implementing -x deducing parameter and
	(C++14)      return types
		     (class template specialization)

Member types
	Type						      Definition
	result_type (deprecated in C++17)(removed in C++20)   T
	argument_type (deprecated in C++17)(removed in C++20) T

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

Member functions
	operator() returns the negation of the argument
		   (public member function)

     std::negate::operator()

	T operator()( const T& arg ) const;	       (until C++14)
	constexpr T operator()( const T& arg ) const;  (since C++14)

	Returns the negation of arg.

Parameters
	arg - value to compute negation of

Return value
	The result of -arg.

Exceptions
	May throw implementation-defined exceptions.

Possible implementation
	constexpr T operator()(const T& arg) const
	{
	    return -arg;
	}

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