[vtkusers] New() method in vtk class hierarchy

[Xiaobin Wang]

Hi all,
I am writing my own derived class . I find the sensible part in the code
lies in
the New() method.

I looked into some class source code in vtk (e.g. vtkCone,vtkShpere) ,and
found
New methods there just be declared  in header files but not defined . Out of
curiosity,
I want to know when calling the New(), how does vtk return a new object ?

I believe it is the C++ problems (maybe involving static member functions)
,but hope some one here can help me to clarify this problem.

Thanks in advance and looking forward to hearing from you.
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