template< class T >
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 behavior is undefined.
type the signed integer type corresponding to T [edit] Helper types
template< class T >
using make_signed_t = typename make_signed<T>::type;
#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>
);
}[edit] See also checks if a type is a signed arithmetic type
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