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std::weak_ptr::expired

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< cpp‎ | memory‎ | weak ptr

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C++
 
Bibliothèque d'utilitaires
 
La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
Répartiteurs
Original:
Allocators
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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
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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
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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
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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
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Miscellaneous
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pointer_traits (C++11)
addressof (C++11)
align (C++11)
Bibliothèque C
Original:
C Library
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std::weak_ptr
Les fonctions membres
Original:
Member functions
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weak_ptr::weak_ptr
weak_ptr::~weak_ptr
weak_ptr::operator=
Modificateurs
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Modifiers
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weak_ptr::reset
weak_ptr::swap
Des observateurs
Original:
Observers
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weak_ptr::use_count
weak_ptr::expired
weak_ptr::lock
weak_ptr::owner_before
Tiers fonctions
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Non-member functions
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std::swap
 
bool expired() const;
 (depuis C++11)
Vérifie si l'objet géré a déjà été supprimé. Equivalent à use_count() == 0 .
Original:
Checks whether the managed object has already been deleted. Equivalent to use_count() == 0.
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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

true si l'objet géré a déjà été supprimé, false autrement .
Original:
true if the managed object has already been deleted, false otherwise.
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Notes

expired() peut être plus rapide que use_count() .
Original:
expired() may be faster than use_count().
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[modifier] Exemple

Montre comment expiré est utilisé pour vérifier la validité du pointeur .
Original:
Demonstrates how expired is used to check validity of the pointer.
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#include <iostream>
#include <memory>
 
std::weak_ptr<int> gw;
 
void f()
{
    if (!gw.expired()) {
	std::cout << "gw is valid\n";
    }
    else {
        std::cout << "gw is expired\n";
    }
}
 
int main()
{
    {
        auto sp = std::make_shared<int>(42);
	gw = sp;
 
	f();
    }
 
    f();
}

Résultat : 

gw is valid
gw is expired


[modifier] Voir aussi
crée un shared_ptr qui gère l'objet référencé
Original:
creates a shared_ptr that manages the referenced object
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(fonction membre publique) [edit]
retourne le nombre d'objets qui gèrent shared_ptr l'objet
Original:
returns the number of shared_ptr objects that manage the object
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(fonction membre publique) [edit]
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