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Use boost::optional to simplify VxCreator

Gerhard Raven requested to merge modernize-vxcreator into master
  • instead of keeping a seperate bool to flag the presence of a 'dummy' trivial value, use boost::optional instead, which avoids having to create a 'dummy', and which avoids the corresponding bookkeeping. This fixes the longstanding warning about hiding virtual functions, as the instance which caused the warning isn't instantiated anymore...
  • replace a deprecated std::auto_ptr with std::unique_ptr

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