std::is_unsigned — cppreference.com

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Déclaré dans l'en-tête `<type_traits>`
`template< class T > struct is_unsigned;`		(depuis C++11)

Si T est un type arithmétique non signée, fournit du membre de constante value true égale. Pour tout autre type, value est 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


value [ statique Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	`true` si `T` is an unsigned arithmetic type , `false` autrement 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. (constante membre statique publique)

Member functions


	convertit l'objet en `bool`, retourne `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. (fonction membre publique)

Member types


Type d' 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>`

Exemple

#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';
}

Résultat :

false
false
false
true
false
false

Voir aussi


is_signed (C++11)	vérifie si un type est signée type arithmétique 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. (classe générique) [edit]

is_floating_point (C++11)	vérifie si un type est type à virgule flottante 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. (classe générique) [edit]

is_integral (C++11)	vérifie si un type est de type intégral 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. (classe générique) [edit]

make_signed (C++11)	rend le type de donnée intégrale signé 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. (classe générique) [edit]

make_unsigned (C++11)	rend le type de donnée intégrale non signé 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. (classe générique) [edit]