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std::make_unsigned(3) | C++ Standard Libary | std::make_unsigned(3) |
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)
The behavior of a program that adds specializations for make_unsigned 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 <iostream>
#include <type_traits>
int main() {
typedef std::make_unsigned<char>::type char_type;
typedef std::make_unsigned<int>::type int_type;
typedef std::make_unsigned<volatile long>::type long_type;
bool ok1 = std::is_same<char_type, unsigned char>::value;
bool ok2 = std::is_same<int_type, unsigned int>::value;
bool ok3 = std::is_same<long_type, volatile unsigned long>::value;
std::cout << std::boolalpha
<< "char_type is 'unsigned char'? : " << ok1 <<
'\n'
<< "int_type is 'unsigned int'? : " << ok2 <<
'\n'
<< "long_type is 'volatile unsigned long'? : " << ok3
<< '\n';
}
Output:¶
char_type is 'unsigned char'? : true
int_type is 'unsigned int'? : true
long_type is 'volatile unsigned long'? : true
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)
2022.07.31 | http://cppreference.com |