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std::enable_shared_from_this::shared_from_this

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La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
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unique_ptr (C++11)
shared_ptr (C++11)
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enable_shared_from_this (C++11)
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std::enable_shared_from_this
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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=
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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)
Retourne une std::shared_ptr<T> qui partage la propriété de *this avec tous std::shared_ptr<T> existant qui se réfèrent à *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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Sommaire

[modifier] Notes

Avant d'appeler shared_from_this, il devrait y avoir au moins un std::shared_ptr<T> p qui possède *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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[modifier] Retourne la valeur

std::shared_ptr<T> qui partage la propriété avec des *this préexistantes 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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[modifier] Exemple

#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";   
}

Résultat :

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

[modifier] Voir aussi

(C++11)
pointeur intelligent avec sémantique de propriétaires partagés
(classe générique) [edit]