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digitalmars.D.learn - emplacing extern(C++) class

I'm interfacing to C++ I using emplacing extern(C++) to malloc'ed memory 
like http://wiki.dlang.org/Memory_Management (see Explicit Class 
Instance Allocation)
This code segfaulted with extern(C++) TestClass.
I guess it's because extern(C++) class aren't rooted from Object so
instead of destroy(obj) (in heapDeallocation) I should use obj.__dtor()?
It works, but I'm not expert and so not sure.
Could someone confirm or no my thoughts?
Thank in advance
Jan 16 2017