std::enable_shared_from_this<T>::shared_from_this

Since C++11

Returns a std::shared_ptr that shares ownership of *this with all existing std::shared_ptr that refer to *this.

# Declarations

std::shared_ptr<T> shared_from_this();

(since C++11)

std::shared_ptr<T const> shared_from_this() const;

(since C++11)

# Return value

std::shared_ptr(weak_this )

# Example

#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";   
}

# See also

shared_ptr