std::make_unsigned

< cpp‎ | types
Defined in header <type_traits>
template< class T >
struct make_unsigned;
 (since C++11)

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

If T is signed or unsigned char, short, int, long, long long; the unsigned 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 unsigned 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)

The behavior of a program that adds specializations for std::make_unsigned is undefined.

Member types

Name Definition
type the unsigned integer type corresponding to T

Helper types

template< class T >
using make_unsigned_t = typename make_unsigned<T>::type;
 (since C++14)

Example

#include <type_traits>
 
int main()
{
    using uchar_type = std::make_unsigned_t<char>;
    using uint_type  = std::make_unsigned_t<int>;
    using ulong_type = std::make_unsigned_t<volatile long>;
 
    static_assert(
        std::is_same_v<uchar_type, unsigned char> and
        std::is_same_v<uint_type, unsigned int> and
        std::is_same_v<ulong_type, volatile unsigned long>
    );
}

See also

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