Namespaces
Variants
Views
Actions

std::make_unsigned

From cppreference.com
< cpp‎ | types
 
 
Metaprogramming library
Type traits
Type categories
(C++11)
(C++14)  
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type properties
(C++11)
(C++11)
(C++14)
(C++11)
(C++11)(until C++20*)
(C++11)(deprecated in C++20)
(C++11)
Type trait constants
Metafunctions
(C++17)
Supported operations
Relationships and property queries
Type modifications
(C++11)(C++11)(C++11)
make_unsigned
(C++11)
Type transformations
(C++11)(deprecated in C++23)
(C++11)(deprecated in C++23)
(C++11)
(C++11)
(C++17)

(C++11)(until C++20*)(C++17)
Compile-time rational arithmetic
Compile-time integer sequences
 
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)

If the program adds specializations for std::make_unsigned, the behavior is undefined.

Contents

[edit] Member types

Name Definition
type the unsigned integer type corresponding to T

[edit] Helper types

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

[edit] 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>
    );
}

[edit] See also

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