From cppreference.com
template<classT>structmake_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, longlong; 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
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 typethe unsigned integer type corresponding to THelper types
template<classT>usingmake_unsigned_t=typenamemake_unsigned<T>::type;(since C++14)Example
Run this code
#include<type_traits>intmain(){usinguchar_type=std::make_unsigned_t<char>;usinguint_type=std::make_unsigned_t<int>;usingulong_type=std::make_unsigned_t<volatilelong>;static_assert(std::is_same_v<uchar_type,unsignedchar>andstd::is_same_v<uint_type,unsignedint>andstd::is_same_v<ulong_type,volatileunsignedlong>);}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)
obtains the corresponding signed type for the given integral type
(class template)
(C++26)
returns the corresponding signed type for reflected integral type
(function)
(C++26)
returns the corresponding unsigned type for reflected integral type
(function)