std::make_signed

Since C++11

Header: <type_traits>

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.

# Declarations

template< class T >
struct make_signed;

(since C++11)

# Example

#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