Add optional files.

2016-08-09 20:16:47 +02:00
parent fc56e70172
commit c382ce5260
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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