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std::weak_ptr::weak_ptr

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< cpp‎ | memory‎ | weak ptr

 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Gestión de memoria dinámica
Bajo la gestión de memoria de nivel
Los asignadores
Original:
Allocators
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Inicializar el almacenamiento
Original:
Uninitialized storage
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Punteros inteligentes
Original:
Smart pointers
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(C++11)
(C++11)
(C++11)
(obsoleto)
(C++11)
Garbage soporte colección
Original:
Garbage collection support
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Varios
Original:
Miscellaneous
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(C++11)
(C++11)
C Library
Original:
C Library
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std::weak_ptr
Las funciones miembro
Original:
Member functions
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weak_ptr::weak_ptr
Modificadores
Original:
Modifiers
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Los observadores
Original:
Observers
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Terceros funciones
Original:
Non-member functions
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constexpr weak_ptr();
(1) (desde C++11)
weak_ptr( const weak_ptr& r );
(2) (desde C++11)
template< class Y >
weak_ptr( const weak_ptr<Y>& r );
(2) (desde C++11)
template< class Y >
weak_ptr( const std::shared_ptr<Y>& r );
(2) (desde C++11)
Construye weak_ptr nuevo que potencialmente comparte un objeto con r .
Original:
Constructs new weak_ptr that potentially shares an object with r.
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1)
Por defecto constructor. Construye weak_ptr vacío .
Original:
Default constructor. Constructs empty weak_ptr.
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2)
Construye weak_ptr nuevo que comparte un objeto administrado por r. Si r administra ningún objeto, ningún objeto *this gestiona también. Las sobrecargas con plantilla no participan en la resolución de sobrecarga Y* a menos que se pueda convertir implícitamente a 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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Contenido

[editar] Parámetros

r -
un std::shared_ptr o std::weak_ptr que estará al alcance de este 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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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Ejemplo

#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';
}

Salida:

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

[editar] Ver también

asigna el weak_ptr
Original:
assigns the weak_ptr
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(función miembro público) [editar]