Improve exception safety with smart pointers

[elfring]

Would you like to wrap any pointer data members with the template class “std::unique_ptr”?

[CatKang]

Thanks elfring,

But we prefer to use raw pointer than any smart pointers, and believe following good code style we can control it with no extra overhead.

Only once we used shared_ptr for Partition since we need its sharing of ownership and reference counting.

[elfring]

Did you notice that the implementation of the class “ZPMetaServer” is unsafe so far because of mentioned preferences?