2 Copyright 2019 Peter Dimov
4 Distributed under the Boost Software License, Version 1.0.
6 See accompanying file LICENSE_1_0.txt or copy at
7 http://www.boost.org/LICENSE_1_0.txt
18 * Added `allocate_unique`
22 * Added aliasing constructors to `weak_ptr`
23 * Added `weak_ptr<T>::empty()`
24 * Added `enable_shared_from`, `shared_from`, and `weak_from`
28 * Added `atomic_shared_ptr`
29 * Added `local_shared_ptr`, `make_local_shared`