[vtkusers] Forward declaration of Foo enough for vtkNew<Foo> declaration?

[Elvis Stansvik]

Hi,

The overview at

    https://blog.kitware.com/a-tour-of-vtk-pointer-classes/

seems to suggest that forward declaration of a class Foo should be enough
to be able to declare a vtkNew<Foo> (e.g. see how vtkTable is used in the
code example under "Use of Classes").

But when I try e.g:

class vtkCompositeTransferFunctionItem;
...
vtkNew<vtkCompositeTransferFunctionItem> m_functionsItem;

I get

    error: invalid use of incomplete type ‘class
vtkCompositeTransferFunctionItem’

Do I really need to include vtkCompositeTransferFunctionItem.h to declare a
vtkNew<vtkCompositeTransferFunctionItem> ?

Thanks,
Elvis
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