std::enable_shared_from_this - Man Page

shared_ptr< _Tp > shared_from_this ()
shared_ptr< const _Tp > shared_from_this () const

enable_shared_from_this (const enable_shared_from_this &) noexcept
enable_shared_from_this & operator= (const enable_shared_from_this &) noexcept

const enable_shared_from_this * __enable_shared_from_this_base (const __shared_count<> &, const enable_shared_from_this *__p)
template<typename, _Lock_policy> class __shared_ptr

class std::enable_shared_from_this< _Tp >"Base class allowing use of the member function shared_from_this.

Since

C++11