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std::enable_shared_from_this::shared_from_this

Da cppreference.com.

 
 
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::enable_shared_from_this
Protetto funzioni membro
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Protected member functions
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enable_shared_from_this::enable_shared_from_this
enable_shared_from_this::~enable_shared_from_this
enable_shared_from_this::operator=
Funzioni membro pubbliche
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Public member functions
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enable_shared_from_this::shared_from_this
 
shared_ptr<T> shared_from_this();
(1)
shared_ptr<T const> shared_from_this() const;
(2)
Restituisce un std::shared_ptr<T> che la proprietà di parti *this con tutto std::shared_ptr<T> esistenti che fanno riferimento a *this.
Original:
Returns a std::shared_ptr<T> that shares ownership of *this with all existing std::shared_ptr<T> that refer to *this.
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Indice

[modifica] Note

Prima di chiamare shared_from_this, ci dovrebbe essere almeno un std::shared_ptr<T> p che possiede *this.
Original:
Before calling shared_from_this, there should be at least one std::shared_ptr<T> p that owns *this.
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[modifica] Valore di ritorno

std::shared_ptr<T> che la proprietà di parti *this con pre-esistenti std::shared_ptr<T>s
Original:
std::shared_ptr<T> that shares ownership of *this with pre-existing std::shared_ptr<T>s
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[modifica] Esempio

#include <iostream>
#include <memory>
 
struct Foo : public std::enable_shared_from_this<Foo> {
    Foo() { std::cout << "Foo::Foo\n"; }
    ~Foo() { std::cout << "Foo::~Foo\n"; } 
    std::shared_ptr<Foo> getFoo() { return shared_from_this(); }
};
 
int main() {
    Foo *f = new Foo;
    std::shared_ptr<Foo> pf1;
 
    {
        std::shared_ptr<Foo> pf2(f);
        pf1 = pf2->getFoo();  // shares ownership of object with pf2
    }
 
    std::cout << "pf2 is gone\n";   
}

Output:

Foo::Foo
pf2 is gone
Foo::~Foo

[modifica] Vedi anche

smart pointer with shared object ownership semantics
(classe template) [edit]