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std::weak_ptr::weak_ptr

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< cpp‎ | memory‎ | weak ptr

 
 
 
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
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C Library
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std::weak_ptr
Les fonctions membres
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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
 
constexpr weak_ptr();
(1) (depuis C++11)
weak_ptr( const weak_ptr& r );
(2) (depuis C++11)
template< class Y >
weak_ptr( const weak_ptr<Y>& r );
(2) (depuis C++11)
template< class Y >
weak_ptr( const std::shared_ptr<Y>& r );
(2) (depuis C++11)
Construit weak_ptr nouvelle qui partage potentiellement un objet avec r .
Original:
Constructs new weak_ptr that potentially shares an object with r.
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1)
Constructeur par défaut. Construit weak_ptr vide .
Original:
Default constructor. Constructs empty weak_ptr.
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2)
Construit weak_ptr nouvelle qui partage un objet géré par r. Si r gère aucun objet, aucun objet *this gère aussi. Les surcharges templated ne participent pas à la résolution de surcharge à moins Y* est implicitement convertible en T* .
Original:
Constructs new weak_ptr which shares an object managed by r. If r manages no object, *this manages no object too. The templated overloads don't participate in the overload resolution unless Y* is implicitly convertible to T*.
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Sommaire

[modifier] Paramètres

r -
un std::shared_ptr ou std::weak_ptr qui sera vu par cette std::weak_ptr
Original:
a std::shared_ptr or std::weak_ptr that will be viewed by this std::weak_ptr
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#include <memory>
#include <iostream>
 
struct Foo {};
 
int main()
{
   std::weak_ptr<Foo> w_ptr;
 
   {
      auto ptr = std::make_shared<Foo>();
      w_ptr = ptr;
      std::cout << "w_ptr.use_count() inside scope: " << w_ptr.use_count() << '\n';
   }
 
   std::cout << "w_ptr.use_count() out of scope: " << w_ptr.use_count() << '\n';
}

Résultat :

w_ptr.use_count() inside scope: 1
w_ptr.use_count() out of scope: 0

[modifier] Voir aussi

assigne la weak_ptr
Original:
assigns the weak_ptr
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(fonction membre publique) [edit]