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[/
Boost.Optional
Copyright (c) 2003-2007 Fernando Luis Cacciola Carballal
Copyright (c) 2015 Andrzej Krzemienski
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)
]
[section Header <boost/optional/optional_fwd.hpp>]
[section Synopsis]
```
namespace boost {
template <class T> class optional ;
template <class T> void swap ( optional<T>& , optional<T>& );
template <class T> struct optional_swap_should_use_default_constructor ;
} // namespace boost
```
This header only contains declarations.
[endsect]
[endsect]
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