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66c366d18a416fd1f3500581ef44a0f9d584a74b
[SVN r44766]
Improved swap for optional<T>, co-written by Thorsten and Fernando: added support for tweaking whether swap should use T's default constructor. Added swap member function. Discussed at Boost developers' mailing list, "[optional] problems with swap()", http://lists.boost.org/Archives/boost/2008/04/135882.php
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Boost.org optional module
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