Home Original page

std::make_unsigned - cppreference.com

From cppreference.com

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)

If the program adds specializations for std::make_unsigned, the behavior 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

checks if a type is a signed arithmetic type
(class template) [edit]
checks if a type is an unsigned arithmetic type
(class template) [edit]
obtains the corresponding signed type for the given integral type
(class template) [edit]