[vtk-developers] Proposing vtkObjectMacro

[Aashish Chaudhary]

vtkClassMacro is probably better (keeping in mind that would like to add
something like vtkAbstractClassMacro)

On Thu, Sep 13, 2012 at 9:55 AM, Kyle Lutz <kyle.lutz at kitware.com> wrote:

> On Thu, Sep 13, 2012 at 6:49 AM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> > I think it's a great idea.  An additional macro would be needed for
> > abstract classes.  Actually, because these macros are used in class
> > definition (not object declarations per se), I would propose:
> >
> > vtkClassMacro(class,superclass);
> > vtkAbstractClassMacro(class,superclass);
>
> We were talking about adding an additional macro for abstract classes
> but I wanted to start with just one. Later a macro for abstract
> classes could be added.
>
> I am also open to changing the name depending on what the consensus is.
>
> -kyle
>
> >
> >  - David
> >
> > On Thu, Sep 13, 2012 at 7:36 AM, Kyle Lutz <kyle.lutz at kitware.com>
> wrote:
> >> I'd like to propose a new macro to ease the development of new
> >> vtkObject derived classes. When implementing new
> >> filters/algorithms/etc. a lot of boiler plate code is required and
> >> most often just copy-pasted from other similar classes. I've
> >> implemented a new macro named vtkObjectMacro() which reduces this
> >> boilerplate to a single line of code to be included in the class's
> >> declaration. This was inspired by the similar Q_OBJECT macro in Qt.
> >>
> >> Here is the documentation for the macro:
> >>
> >> // Description:
> >> // Declares a vtkObject subclass.
> >> //
> >> // Notably, performs the following actions:
> >> //   - invokes the vtkTypeMacro()
> >> //   - declares its constructor and destructor as protected
> >> //   - disables its copy constructor and assignment operator
> >> //   - declares its static *New() method
> >> //   - declares its PrintSelf() method
> >> #define vtkObjectMacro(className, parentClassName)
> >>
> >> For example, here is how it would be used when creating a new
> >> poly-data algorithm named MyFilter:
> >>
> >> // in myfilter.h
> >> class MyFilter : public vtkPolyDataAlgorithm
> >> {
> >> public:
> >>   vtkObjectMacro(MyFilter, vtkPolyDataAlgorithm)
> >> };
> >>
> >> // in myfilter.cxx
> >> vtkStandardNewMacro(MyFilter)
> >> MyFilter::MyFilter() { /* ... */ }
> >> MyFilter::~MyFilter() { /* ... */ }
> >> void MyFilter::PrintSelf(ostream &o, vtkIndent indent) { /* ... */ }
> >>
> >> I've pushed a topic to gerrit with the implementation:
> >> http://review.source.kitware.com/#/t/1276/
> >>
> >> Thoughts? Comments? Concerns?
> >>
> >> Thanks,
> >> Kyle
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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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