std::is_unsigned – cppreference.com

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definiert in Header `<type_traits>`

`template< class T > struct is_unsigned;`		(seit C++11)

Wenn T eine vorzeichenlose arithmetischen Typ ist, stellt das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .

Original:

If T is an unsigned arithmetic type, provides the member constant value equal true. For any other type, value is false.

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Inherited from std::integral_constant

Member constants


	`true` wenn `T` is an unsigned arithmetic type , `false` anders Original: `true` if `T` is an unsigned arithmetic type , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten)

Member functions


	wandelt das Objekt `bool`, gibt `value` Original: converts the object to `bool`, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

Member types


Type Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`bool`

`type`	`std::integral_constant<bool, value>`

Beispiel

#include <iostream>
#include <type_traits>

class A {};
enum B : unsigned {};
enum class C : unsigned {};

int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_unsigned<A>::value << '\n';
    std::cout << std::is_unsigned<float>::value << '\n';
    std::cout << std::is_unsigned<signed int>::value << '\n';
    std::cout << std::is_unsigned<unsigned int>::value << '\n';
    std::cout << std::is_unsigned<B>::value << '\n';
    std::cout << std::is_unsigned<C>::value << '\n';
}

Output:

false
false
false
true
false
false

Siehe auch


is_signed (C++11)	prüft, ob eine Art arithmetischer Typ unterzeichnet wird Original: checks if a type is signed arithmetic type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

is_floating_point (C++11)	prüft, ob ein Typ ist Fließkomma-Typ Original: checks if a type is floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

is_integral (C++11)	prüft, ob ein Typ ist integraler Typ Original: checks if a type is integral type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

make_signed (C++11)	macht den gegebenen ganzzahligen Typ unterzeichnet Original: makes the given integral type signed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

make_unsigned (C++11)	macht den gegebenen ganzzahligen Typ unsigned Original: makes the given integral type unsigned The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]