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std::shared_ptr

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shared_ptr
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std::shared_ptr
Funções de membro
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Member functions
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shared_ptr::shared_ptr
shared_ptr::~shared_ptr
shared_ptr::operator=
Modificadores
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Modifiers
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shared_ptr::reset
shared_ptr::swap
Observadores
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Observers
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shared_ptr::get
shared_ptr::operator*
shared_ptr::operator->
shared_ptr::use_count
shared_ptr::unique
shared_ptr::operator bool
shared_ptr::owner_before
Não-membros funções
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Non-member functions
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Definido no cabeçalho <memory>
template< class T > class shared_ptr;
 (desde C++11)

std::shared_ptr é um ponteiro inteligente que mantém a posse compartilhada de um objeto através de um ponteiro. Vários objetos shared_ptr podem possuir o mesmo objeto; o objeto é destruído quando o último remanescente shared_ptr apontando para ele é destruído ou reiniciado. O objeto é destruído usando expressão-delete ou um destruidor personalizado fornecido ao shared_ptr durante sua construção.

Um shared_ptr também pode possuir nenhum objeto, caso em que ele é chamado de "vazio".

shared_ptr cumpre os requisitos da CopyConstructible e CopyAssignable.
Original:
shared_ptr meets the requirements of CopyConstructible and CopyAssignable.
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Índice

[editar] Tipos de membro

Tipo de membro
Original:
Member type
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 Definition
element_type T

[editar] Funções de membro

 constructs new shared_ptr
(função pública membro) [edit]
destrói o objeto de propriedade, se nenhuma ligação mais shared_ptrs a ele
Original:
destructs the owned object if no more shared_ptrs link to it
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(função pública membro) [edit]
atribui o shared_ptr
Original:
assigns the shared_ptr
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(função pública membro) [edit]
Modificadores
Original:
Modifiers
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substitui o objeto gerenciado
Original:
replaces the managed object
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(função pública membro) [edit]
troca os objetos gerenciados
Original:
swaps the managed objects
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(função pública membro) [edit]
Observadores
Original:
Observers
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retorna um ponteiro para o objeto gerenciado
Original:
returns a pointer to the managed object
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(função pública membro) [edit]
dereferences ponteiro para o objeto gerenciado
Original:
dereferences pointer to the managed object
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(função pública membro) [edit]
retorna o número de objetos shared_ptr referentes ao mesmo objeto gerenciado
Original:
returns the number of shared_ptr objects referring to the same managed object
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(função pública membro) [edit]
Verifica se o objeto gerenciado é gerido apenas pela instância shared_ptr atual
Original:
checks whether the managed object is managed only by the current shared_ptr instance
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(função pública membro) [edit]
verifica se existe é associado objeto gerenciado
Original:
checks if there is associated managed object
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(função pública membro) [edit]
fornece-proprietário baseado ordenação dos ponteiros compartilhados
Original:
provides owner-based ordering of shared pointers
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(função pública membro) [edit]

[editar] Não-membros funções
cria um ponteiro comum que gere um novo objeto
Original:
creates a shared pointer that manages a new object
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(modelo de função) [edit]
cria um ponteiro comum que gere um novo objeto alocado utilizando um alocador
Original:
creates a shared pointer that manages a new object allocated using an allocator
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(modelo de função) [edit]
aplica static_cast, dynamic_cast ou const_cast para o tipo de objeto gerenciado
Original:
applies static_cast, dynamic_cast or const_cast to the type of the managed object
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(modelo de função) [edit]
retorna o deleter do tipo especificado, se possuía
Original:
returns the deleter of specified type, if owned
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(modelo de função) [edit]
compara com outro ou com shared_ptr nullptr
Original:
compares with another shared_ptr or with nullptr
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(modelo de função) [edit]
gera o valor do ponteiro de gestão para um fluxo de saída
Original:
outputs the value of the managed pointer to an output stream
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(modelo de função) [edit]
(C++11)
o algoritmo especializado std::swap
Original:
specializes the std::swap algorithm
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(modelo de função) [edit]
especializada operações atômicas
Original:
specializes atomic operations
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(modelo de função) [edit]

[editar] Classes auxiliares

(C++11)
apoio de hash para std::shared_ptr
Original:
hash support for std::shared_ptr
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(especialização modelo. classe) [edit]

[editar] Notas de implementação

Numa implementação típica, std::shared_ptr prende apenas dois ponteiros:
Original:
In a typical implementation, std::shared_ptr holds only two pointers:
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  • um ponteiro para o objeto referenciado
    Original:
    a pointer to the referenced object
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  • um ponteiro para' bloco de controle
    Original:
    a pointer to control block
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Quando o bloco de controle é um objeto dinamicamente alocados que detém:
Original:
Where the control block is a dynamically-allocated object that holds:
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  • um ponteiro para o objeto gerenciado ou o objeto gerenciado em si
    Original:
    a pointer to the managed object or the managed object itself
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  • o deleter
    Original:
    the deleter
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  • alocador
    Original:
    the allocator
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  • o número de shared_ptrs que possuem o objeto gerenciado
    Original:
    the number of shared_ptrs that own the managed object
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  • o número de weak_ptrs que se referem ao objeto gerenciado
    Original:
    the number of weak_ptrs that refer to the managed object
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Quando shared_ptr é criado chamando std::make_shared ou std::allocate_shared, o bloco de controle mantém o objeto gerenciado diretamente, como um membro de dados. Quando shared_ptr é criado chamando um construtor, um ponteiro é armazenado.
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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O ponteiro realizada pela shared_ptr diretamente é retornado por get(), enquanto o ponteiro / objeto realizada pelo bloco de controle é o que vai ser suprimido quando o número de proprietários compartilhados atinge zero: esses ponteiros não são necessariamente iguais.
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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O destruidor de decréscimos shared_ptr o número de proprietários compartilhada do bloco de controle, e se isso chegar a zero, o bloco de controle chama o destruidor do objeto gerenciado, mas o bloco de controle não desalocar-se até o balcão std::weak_ptr chega a zero, bem.
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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