Espaces de noms
Variantes
Affichages
Actions

std::weak_ptr

De cppreference.com.

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Bibliothèque d'utilitaires
 
La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
Répartiteurs
Original:
Allocators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
allocator
allocator_traits (C++11)
allocator_arg_t (C++11)
allocator_arg (C++11)
uses_allocator (C++11)
scoped_allocator_adaptor (C++11)
Non initialisée stockage
Original:
Uninitialized storage
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
uninitialized_copy
uninitialized_copy_n (C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
Pointeurs intelligents
Original:
Smart pointers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unique_ptr (C++11)
shared_ptr (C++11)
weak_ptr (C++11)
auto_ptr (obsolète)
owner_less (C++11)
enable_shared_from_this (C++11)
bad_weak_ptr (C++11)
default_delete (C++11)
Soutien garbage collection
Original:
Garbage collection support
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
declare_reachable (C++11)
undeclare_reachable (C++11)
declare_no_pointers (C++11)
undeclare_no_pointers (C++11)
pointer_safety (C++11)
get_pointer_safety (C++11)
Divers
Original:
Miscellaneous
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
pointer_traits (C++11)
addressof (C++11)
align (C++11)
Bibliothèque C
Original:
C Library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 
std::weak_ptr
Les fonctions membres
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
weak_ptr::weak_ptr
weak_ptr::~weak_ptr
weak_ptr::operator=
Modificateurs
Original:
Modifiers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
weak_ptr::reset
weak_ptr::swap
Des observateurs
Original:
Observers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
weak_ptr::use_count
weak_ptr::expired
weak_ptr::lock
weak_ptr::owner_before
Tiers fonctions
Original:
Non-member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
std::swap
 
Défini dans l'entête <memory>
template< class T > class weak_ptr;
 (depuis C++11)
std::weak_ptr est un pointeur intelligent qui détient une référence non-propriétaire («faible») à un objet qui est géré par std::shared_ptr. Il doit être converti en std::shared_ptr afin d'accéder à l'objet référencé.
Original:
std::weak_ptr is a smart pointer that holds a non-owning ("weak") reference to an object that is managed by std::shared_ptr. It must be converted to std::shared_ptr in order to access the referenced object.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
std::weak_ptr modèles propriété temporaire: quand un objet doit être accessible uniquement si elle existe, et il peut être supprimé à tout moment par quelqu'un d'autre, std::weak_ptr est utilisé pour suivre l'objet, et il est converti en std::shared_ptr d'assumer la propriété temporaire. Si le std::shared_ptr original est détruit à ce moment, la durée de vie de l'objet est prorogé jusqu'au premier std::shared_ptr temporaire est détruite ainsi .
Original:
std::weak_ptr models temporary ownership: when an object needs to be accessed only if it exists, and it may be deleted at any time by someone else, std::weak_ptr is used to track the object, and it is converted to std::shared_ptr to assume temporary ownership. If the original std::shared_ptr is destroyed at this time, the object's lifetime is extended until the temporary std::shared_ptr is destroyed as well.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
En outre, std::weak_ptr est utilisée pour briser les références circulaires de std::shared_ptr .
Original:
In addition, std::weak_ptr is used to break circular references of std::shared_ptr.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Sommaire

[modifier] Types de membres

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

[modifier] Les fonctions membres
crée un nouveau weak_ptr
Original:
creates a new weak_ptr
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) [edit]
détruit un weak_ptr
Original:
destroys a weak_ptr
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) [edit]
assigne la weak_ptr
Original:
assigns the weak_ptr
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) [edit]
Modificateurs
Original:
Modifiers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
libère la propriété de l'objet géré
Original:
releases the ownership of the managed object
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) [edit]
permute les objets gérés
Original:
swaps the managed objects
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) [edit]
Des observateurs
Original:
Observers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
retourne le nombre d'objets qui gèrent shared_ptr l'objet
Original:
returns the number of shared_ptr objects that manage the object
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) [edit]
vérifie si l'objet référencé a déjà été supprimé
Original:
checks whether the referenced object was already deleted
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) [edit]
crée un shared_ptr qui gère l'objet référencé
Original:
creates a shared_ptr that manages the referenced object
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) [edit]
fournit propriétaire basée ordre des pointeurs faibles
Original:
provides owner-based ordering of weak pointers
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) [edit]

[modifier] Tiers fonctions

(C++11)
l'algorithme spécialisé std::swap
Original:
specializes the std::swap algorithm
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction générique) [edit]

[modifier] Exemple

Montre comment verrou est utilisé pour assurer la validité du pointeur .
Original:
Demonstrates how lock is used to ensure validity of the pointer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <memory>
 
std::weak_ptr<int> gw;
 
void f()
{
    if (auto spt = gw.lock()) { // Has to be copied into a shared_ptr before usage
	std::cout << *spt << "\n";
    }
    else {
        std::cout << "gw is expired\n";
    }
}
 
int main()
{
    {
        auto sp = std::make_shared<int>(42);
	gw = sp;
 
	f();
    }
 
    f();
}

Résultat : 

42
gw is expired
Récupérée de « http://fr.cppreference.com/mwiki/index.php?title=cpp/memory/weak_ptr&oldid=41983 »