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#### Detailed Semantics -- Optional References

> `optional<&>::optional() noexcept;`

> `optional<&>::optional(none_t) noexcept;`

- Postconditions: `*this` refers to nothing.

| Copyright © 2003-2007 Fernando Luis Cacciola Carballal Copyright © 2014-2016 Andrzej Krzemieński 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)