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    std::weak_ptr::lock

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    <metanoindex/>

     
    C++
     
    Utilità libreria
    Tipo di supporto (basic types, RTTI, type traits)
    Gestione della memoria dinamica
    La gestione degli errori
    Programma di utilità
    Funzioni variadic
    Data e ora
    Funzione oggetti
    initializer_list(C++11)
    bitset
    hash(C++11)
    Gli operatori relazionali
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    Relational operators
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    rel_ops::operator!=
    rel_ops::operator>
    rel_ops::operator<=
    rel_ops::operator>=
    Coppie e tuple
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    Pairs and tuples
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    pair
    tuple(C++11)
    piecewise_construct_t(C++11)
    piecewise_construct(C++11)
    Swap, in avanti e spostare
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    Swap, forward and move
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    swap
    forward(C++11)
    move(C++11)
    move_if_noexcept(C++11)
    declval(C++11)
     
    Gestione della memoria dinamica
    Basso livello di gestione della memoria
    Allocatori
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    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 inizializzata stoccaggio
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    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
    Puntatori intelligenti
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    Smart pointers
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    unique_ptr(C++11)
    shared_ptr(C++11)
    weak_ptr(C++11)
    auto_ptr(deprecato)
    owner_less(C++11)
    enable_shared_from_this(C++11)
    bad_weak_ptr(C++11)
    default_delete(C++11)
    Garbage collection supporto
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    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)
    Varie
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    Miscellaneous
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    pointer_traits(C++11)
    addressof(C++11)
    align(C++11)
    C Library
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    C Library
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    std::weak_ptr
    Membri funzioni
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    Member functions
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    weak_ptr::weak_ptr
    weak_ptr::~weak_ptr
    weak_ptr::operator=
    Modificatori
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    Modifiers
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    weak_ptr::reset
    weak_ptr::swap
    Osservatori
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    Observers
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    weak_ptr::use_count
    weak_ptr::expired
    weak_ptr::lock
    weak_ptr::owner_before
    Non membri funzioni
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    Non-member functions
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    std::swap
     
    <tbody> </tbody>
    std::shared_ptr<T> lock() const
    		 (dal C++11)
    Crea una nuova shared_ptr che condivide la proprietà dell'oggetto gestito. Se non c'è oggetto gestito, cioè *this è vuoto, allora il shared_ptr restituito è vuoto.
    Original:
    Creates a new shared_ptr that shares ownership of the managed object. If there is no managed object, i.e. *this is empty, then the returned shared_ptr also is empty.
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    Restituisce efficacemente expired() ? shared_ptr<T>() : shared_ptr<T>(*this).
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    Effectively returns expired() ? shared_ptr<T>() : shared_ptr<T>(*this).
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    Parametri

    (Nessuno)
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    (none)
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    Valore di ritorno

    Un shared_ptr che condivide la proprietà dell'oggetto di proprietà.
    Original:
    A shared_ptr which shares ownership of the owned object.
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    Eccezioni

    noexcept specification:  
    <tbody> </tbody>
    noexcept
      (dal C++11)

    Note

    Sia questa funzione e il costruttore di shared_ptr può essere utilizzato per acquisire la proprietà temporanea dell'oggetto gestito. La differenza è che il costruttore di std::shared_ptr<T> genera un'eccezione quando l'argomento std::weak_ptr è vuoto, mentre std::weak_ptr<T>::lock() costruisce un std::shared_ptr<T> vuoto.
    Original:
    Both this function and the constructor of shared_ptr may be used to acquire temporary ownership of the managed object. The difference is that the constructor of std::shared_ptr<T> throws an exception when the std::weak_ptr argument is empty, while std::weak_ptr<T>::lock() constructs an empty std::shared_ptr<T>.
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    Esempio

    This section is incomplete
    Reason: no example

    Vedi anche
    Verifica se l'oggetto di riferimento è già stato cancellato
    Original:
    checks whether the referenced object was already deleted
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