////
Copyright 2019 Peter Dimov

Distributed under the Boost Software License, Version 1.0.

See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt
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[#changelog]
# Revision History
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:idprefix: changelog_

## Changes in 1.71.0

* Added aliasing constructors to `weak_ptr`
* Added `weak_ptr<T>::empty()`