std::enable_shared_from_this<T>::enable_shared_from_this

From cppreference.com
 
 
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)
(C++23)
Elementary string conversions
(C++17)
(C++17)
 
Dynamic memory management
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Allocators
Garbage collection support
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)



 
 
constexpr enable_shared_from_this() noexcept;
(1) (since C++11)
enable_shared_from_this( const enable_shared_from_this& other ) noexcept;
(2) (since C++11)

Constructs a new enable_shared_from_this object. The exposition only std::weak_ptr<T> member weak-this is value-initialized.

Parameters

other - an enable_shared_from_this to copy

Notes

There is no move constructor: moving from an object derived from enable_shared_from_this does not transfer its shared identity.

Example

#include <memory>
 
struct Foo : public std::enable_shared_from_this<Foo>
{
    Foo() {} // implicitly calls enable_shared_from_this constructor
    std::shared_ptr<Foo> getFoo() { return shared_from_this(); }
};
 
int main()
{
    std::shared_ptr<Foo> pf1(new Foo);
    auto pf2 = pf1->getFoo(); // shares ownership of object with pf1
}

See also

smart pointer with shared object ownership semantics
(class template)