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std::shared_ptr

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C++
 
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)
(C++11)
Operadores relacionales
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Relational operators
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Pares y tuplas
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Pairs and tuples
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Cambiar, hacia adelante y mover
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Swap, forward and move
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(C++11)
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Gestión de memoria dinámica
Bajo la gestión de memoria de nivel
Los asignadores
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Allocators
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(C++11)
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Inicializar el almacenamiento
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Uninitialized storage
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Punteros inteligentes
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Smart pointers
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(C++11)
shared_ptr
(C++11)
(C++11)
(obsoleto)
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(C++11)
(C++11)
(C++11)
Garbage soporte colección
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Garbage collection support
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(C++11)
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Varios
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Miscellaneous
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C Library
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C Library
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std::shared_ptr
Las funciones miembro
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Member functions
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Modificadores
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Modifiers
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Los observadores
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Observers
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Terceros funciones
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Non-member functions
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Definido en la cabecera <memory>
template< class T > class shared_ptr;
 (desde C++11)
std::shared_ptr es un puntero inteligente que mantiene la propiedad compartida de un objeto a través de un puntero. Varios objetos shared_ptr pueden poseer el mismo objeto, el objeto se destruye cuando el shared_ptr último que queda apuntando a que se destruye o se restablece. El objeto se destruye usando delete-expression o un Deleter personalizado que se suministra a shared_ptr durante la construcción .
Original:
std::shared_ptr is a smart pointer that retains shared ownership of an object through a pointer. Several shared_ptr objects may own the same object; the object is destroyed when the last remaining shared_ptr pointing to it is destroyed or reset. The object is destroyed using delete-expression or a custom deleter that is supplied to shared_ptr during construction.
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Un shared_ptr también puede poseer ningún objeto, en cuyo caso se llama vacío .
Original:
A shared_ptr may also own no objects, in which case it is called empty.
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shared_ptr cumple los requisitos de CopyConstructible y CopyAssignable .
Original:
shared_ptr meets the requirements of CopyConstructible and CopyAssignable.
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Contenido

[editar] Tipos de miembros

Miembro de tipo
Original:
Member type
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 Definition
element_type T

[editar] Las funciones miembro

 constructs new shared_ptr
(función miembro público) [editar]
destruye la propiedad del objeto si no hay vínculo más shared_ptrs a ella
Original:
destructs the owned object if no more shared_ptrs link to it
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(función miembro público) [editar]
asigna el shared_ptr
Original:
assigns the shared_ptr
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(función miembro público) [editar]
Modificadores
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Modifiers
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reemplaza el objeto administrado
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replaces the managed object
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(función miembro público) [editar]
intercambia los objetos gestionados
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swaps the managed objects
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(función miembro público) [editar]
Los observadores
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Observers
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devuelve un puntero al objeto gestionado
Original:
returns a pointer to the managed object
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(función miembro público) [editar]
desreferencia de puntero al objeto gestionado
(función miembro público) [editar]
devuelve el número de objetos que se refieren a la shared_ptr objeto gestionado mismo
Original:
returns the number of shared_ptr objects referring to the same managed object
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(función miembro público) [editar]
Comprueba si el objeto administrado es manejado sólo por la instancia shared_ptr actual
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checks whether the managed object is managed only by the current shared_ptr instance
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(función miembro público) [editar]
comprueba si se asocia objeto administrado
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checks if there is associated managed object
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(función miembro público) [editar]
proporciona propietario basado pedido de punteros compartidos
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provides owner-based ordering of shared pointers
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(función miembro público) [editar]

[editar] Terceros funciones
crea un puntero compartido que gestiona un nuevo objeto
Original:
creates a shared pointer that manages a new object
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(plantilla de función) [editar]
crea un puntero compartido que gestiona un nuevo objeto asignado usando un asignador
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creates a shared pointer that manages a new object allocated using an allocator
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(plantilla de función) [editar]
aplica static_cast, dynamic_cast o const_cast para el tipo de objeto administrado
Original:
applies static_cast, dynamic_cast or const_cast to the type of the managed object
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(plantilla de función) [editar]
devuelve el Deleter del tipo especificado, si poseía
Original:
returns the deleter of specified type, if owned
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(plantilla de función) [editar]
compara con otro shared_ptr o con nullptr
(plantilla de función) [editar]
emite el valor del puntero administrado a un flujo de salida
Original:
outputs the value of the managed pointer to an output stream
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(plantilla de función) [editar]
(C++11)
el algoritmo se especializa std::swap
Original:
specializes the std::swap algorithm
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(plantilla de función) [editar]
se especializa operaciones atómicas
Original:
specializes atomic operations
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(plantilla de función) [editar]

[editar] Clases de ayuda

(C++11)
apoyo hash para std::shared_ptr
Original:
hash support for std::shared_ptr
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(especialización de plantilla de clase) [editar]

[editar] Notas de aplicación

En una implementación típica, std::shared_ptr tiene sólo dos punteros:
Original:
In a typical implementation, std::shared_ptr holds only two pointers:
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  • un puntero para el objeto de referencia
    Original:
    a pointer to the referenced object
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  • un puntero a' bloque de control
    Original:
    a pointer to control block
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Cuando el bloque de control es un objeto asignados de forma dinámica que contiene:
Original:
Where the control block is a dynamically-allocated object that holds:
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  • un puntero al objeto gestionado o administrado el objeto en sí
    Original:
    a pointer to the managed object or the managed object itself
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  • el Deleter
    Original:
    the deleter
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  • el asignador
    Original:
    the allocator
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  • el número de shared_ptrs que poseen el objeto administrado
    Original:
    the number of shared_ptrs that own the managed object
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  • el número de weak_ptrs que se refieren al objeto administrado
    Original:
    the number of weak_ptrs that refer to the managed object
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Cuando shared_ptr se crea llamando std::make_shared o std::allocate_shared, el bloque de control contiene el objeto administrado directamente, como un miembro de datos. Cuando shared_ptr se crea llamando a un constructor, un puntero se guarda .
Original:
When shared_ptr is created by calling std::make_shared or std::allocate_shared, the control block holds the managed object directly, as a data member. When shared_ptr is created by calling a constructor, a pointer is stored.
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El puntero del poder del shared_ptr directamente es la devuelta por get(), mientras que el puntero / object poder del bloque de control es el que se eliminarán cuando el número de propietarios compartidas llega a cero: estos indicadores no son necesariamente iguales .
Original:
The pointer held by the shared_ptr directly is the one returned by get(), while the pointer/object held by the control block is the one that will be deleted when the number of shared owners reaches zero: these pointers are not necessarily equal.
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El destructor de shared_ptr disminuye el número de propietarios compartidos del bloque de control y, en caso de que llegue a cero, el bloque de control llama al destructor del objeto gestionado, pero el bloque de control no se desasigna hasta que el contador llegue a cero std::weak_ptr también .
Original:
The destructor of shared_ptr decrements the number of shared owners of the control block, and if that reaches zero, the control block calls the destructor of the managed object, but the control block does not deallocate itself until the std::weak_ptr counter reaches zero as well.
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