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

NAME
       std::make_signed	- std::make_signed

Synopsis
	  Defined in header <type_traits>
	  template< class T >		   (since C++11)
	  struct make_signed;

	  If  T	is an integral (except bool) or	enumeration type, provides the
       member typedef
	  type which is	the signed integer type	corresponding to T,  with  the
       same
	  cv-qualifiers.

	  If  T	 is  signed or unsigned	char, short, int, long,	long long, the
       signed type from
	  this list corresponding to T is provided.

	  If T is an enumeration type or char, wchar_t
	  , char8_t
	  (since C++20), char16_t, char32_t, the signed	integer	type with  the
       smallest	rank
	  having the same sizeof as T is provided.

	  Otherwise, the behavior is undefined.	(until C++20)
	  Otherwise, the program is ill-formed.	(since C++20)

	  If the program adds specializations for std::make_signed, the	behav-
       ior is undefined.

Member types
	  Name Definition
	  type the signed integer type corresponding to	T

Helper types
	  template< class T >					(since C++14)
	  using	make_signed_t =	typename make_signed<T>::type;

Example
       // Run this code

	#include <type_traits>

	enum struct E :	unsigned short {};

	int main()
	{
	    using char_type = std::make_signed_t<unsigned char>;
	    using int_type  = std::make_signed_t<unsigned int>;
	    using long_type = std::make_signed_t<volatile unsigned long>;
	    using enum_type = std::make_signed_t<E>;

	    static_assert(
		std::is_same_v<char_type, signed char> and
		std::is_same_v<int_type, signed	int> and
		std::is_same_v<long_type, volatile signed long>	and
		std::is_same_v<enum_type, signed short>
	    );
	}

See also
	  is_signed	checks if a type is a signed arithmetic	type
	  (C++11)	(class template)
	  is_unsigned	checks if a type is an unsigned	arithmetic type
	  (C++11)	(class template)
	  make_unsigned	makes the given	integral type unsigned
	  (C++11)	(class template)

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

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