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std::is_rvalue_reference

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Les types de base
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Basic types
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Types fondamentaux
Fixe les types entiers largeur (C++11)
Limites numériques
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Numeric limits
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numeric_limits
C numérique limite interface
Informations sur le type d'exécution
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Runtime type information
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Caractères de type
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Type traits
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Catégories de type primaire
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Primary type categories
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is_void (C++11)
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is_fundamental (C++11)
is_arithmetic (C++11)
is_reference (C++11)
is_lvalue_reference (C++11)
is_rvalue_reference (C++11)
is_member_pointer (C++11)
is_member_object_pointer (C++11)
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Les propriétés du type
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Type properties
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is_const (C++11)
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Opérations prises en charge
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Supported operations
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is_constructible
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is_move_assignable
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is_destructible
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(C++11)
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has_virtual_destructor (C++11)
Les relations et les requêtes de propriété
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Relationships and property queries
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is_same (C++11)
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is_convertible (C++11)
alignment_of (C++11)
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Modifications de type
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Type modifications
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aligned_storage (C++11)
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conditional (C++11)
common_type (C++11)
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result_of (C++11)
Tapez constantes traits
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Type trait constants
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integral_constant (C++11)
 
Defined in header <type_traits>
template< class T >
struct is_rvalue_reference;
(depuis C++11)
Si T est un type de référence rvalue, fournit du membre de constante value true égale. Pour tout autre type, value est false .
Original:
If T is an rvalue reference type, provides the member constant value equal true. For any other type, value is false.
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Sommaire

Inherited from std::integral_constant

Member constants

value
[
statique
Original:
static
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]
true si T is an rvalue reference type , false autrement
Original:
true if T is an rvalue reference type , false otherwise
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(constante membre statique publique)

Member functions

operator bool
convertit l'objet en bool, retourne value
Original:
converts the object to bool, returns value
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(fonction membre publique)

Member types

Type d'
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[modifier] Mise en œuvre possible

template <class T> struct is_rvalue_reference      : std::false_type {};
template <class T> struct is_rvalue_reference<T&&> : std::true_type {};

[modifier] Exemple

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_rvalue_reference<A>::value << '\n';
    std::cout << std::is_rvalue_reference<A&>::value << '\n';
    std::cout << std::is_rvalue_reference<A&&>::value << '\n';
    std::cout << std::is_rvalue_reference<int>::value << '\n';
    std::cout << std::is_rvalue_reference<int&>::value << '\n';
    std::cout << std::is_rvalue_reference<int&&>::value << '\n';
}

Résultat :

false
false
true
false
false
true

[modifier] Voir aussi

vérifie si un type est' lvalue de référence
Original:
checks if a type is lvalue reference
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(classe générique) [edit]
vérifie si un type est soit lvalue de référence ou' rvalue de référence
Original:
checks if a type is either lvalue reference or rvalue reference
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(classe générique) [edit]