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std::enable_shared_from_this::shared_from_this

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C++
 
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initializer_list(C++11)
bitset
hash(C++11)
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rel_ops::operator!=
rel_ops::operator>
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pair
tuple(C++11)
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piecewise_construct(C++11)
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Swap, forward and move
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swap
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Gestione della memoria dinamica
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enable_shared_from_this(C++11)
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C Library
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std::enable_shared_from_this
Protetto funzioni membro
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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.
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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

(C++11)
 smart pointer with shared object ownership semantics
(classe template) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/memory/enable_shared_from_this/shared_from_this&oldid=26124"