NAME¶

std::make_unsigned - std::make_unsigned

Synopsis¶

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

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

Example¶

// Run this code

#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¶

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_signed makes the given integral type signed
(C++11) (class template)