std::is_object — cppreference.com

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

Si T est un type d'objet (c'est-à-scalaire, tableau, classe, ou de l'union), fournit du membre de constante value true égale. Pour tout autre type, value est false .

Original:

If T is an object type (that is, scalar, array, class, or union), 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 object type , `false` autrement Original: `true` if `T` is an object 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>`

Mise en œuvre possible

template< class T>
struct is_object : std::integral_constant<bool,
                     std::is_scalar<T>::value ||
                     std::is_array<T>::value  ||
                     std::is_union<T>::value  ||
                     std::is_class<T>::value> {};

Exemple

#include <iostream>
#include <type_traits>

int main() {
    class cls {};
    std::cout << std::boolalpha;
    std::cout << std::is_object<int>::value << '\n';
    std::cout << std::is_object<int&>::value << '\n';
    std::cout << std::is_object<cls>::value << '\n';
    std::cout << std::is_object<cls&>::value << '\n';
}

Résultat :

Voir aussi


is_scalar (C++11)	vérifie si un type est de type scalaire Original: checks if a type is scalar 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_array (C++11)	vérifie si un type est un type tableau Original: checks if a type is an array 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_union (C++11)	vérifie si un type est un type d'union Original: checks if a type is an union 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_class (C++11)	checks if a type is a class type (but not union type) (classe générique) [edit]