Ok, we should have done a better job at documenting these.
For most of the features like ORC_UNIQUE_PTR and ORC_NOEXCEPT, we take two
different approaches depending on the context:
In external header files, we always use the ORC_*, because the users have
to be able to include our header files
Hi Fang,
ORC_UNIQUE_PTR was intended to support platforms which does not support
c++11. You can also find that std::unique_ptr is translated into
std::auto_ptr as well. Current and future versions of ORC will not support
those obsolete platforms; therefore I think it is ok to use std::unique_ptr
