std::enable_shared_from_this::shared_from_this
From cppreference.com
< cpp | memory | enable shared from this
shared_ptr<T> shared_from_this();
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shared_ptr<T const> shared_from_this() const;
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Returns a std::shared_ptr<T> that shares ownership of *this with all existing std::shared_ptr that refer to *this.
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[edit] Notes
Before calling shared_from_this
, there should be at least one std::shared_ptr p
that owns *this.
[edit] Return value
std::shared_ptr<T> that shares ownership of *this with pre-existing std::shared_ptrs
[edit] Example
Run this code
#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
[edit] See also
(C++11)
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smart pointer with shared object ownership semantics (class template) |