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Copyright (C) 2011-2012 Andrzej Krzemienski
Distributed under the Boost Software License, Version 1.0
(see accompanying file LICENSE_1_0.txt or a copy at
http://www.boost.org/LICENSE_1_0.txt)
The idea and interface is based on Boost.Optional library
authored by Fernando Luis Cacciola Carballal
Home at https://github.com/akrzemi1/Optional
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