std::make_unsigned

 

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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, 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 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

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<volatilelong>;   static_assert(std::is_same_v<uchar_type, unsignedchar> and std::is_same_v<uint_type, unsignedint> and std::is_same_v<ulong_type, volatileunsignedlong>);}

See also

is_signed (C++11)	checks if a type is a signed arithmetic type (class template)
is_unsigned (C++11)	checks if a type is an unsigned arithmetic type (class template)
make_signed (C++11)	obtains the corresponding signed type for the given integral type (class template)