[Insight-users] Pointer to itk image or filter of any type

[Miller, James V (Research)]

This is not possible with ITK.  All filters and images must be explictly
typed at compile time.

You can structure your program to provide an algorithm with any datatype
using a switch statement that instantiates an algorithm with the
various datatypes you want to support.

Jim


-----Original Message-----
From: insight-users-bounces+millerjv=crd.ge.com at itk.org
[mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of
Weiguang Guan
Sent: Monday, June 20, 2005 1:34 PM
To: Karthik Krishnan
Cc: insight-users at itk.org
Subject: Re: [Insight-users] Pointer to itk image or filter of any type


Thank you, but this is not what I want. I want to define a generic
itk::Image type with unknown data type, MyGenericITKImageType.  Then,
typedef itk::ImageToImageFilter <MyGenericITKImageType,
MyGenericITKImageType> MyGenericITKFilterType.

Is it possible?

Weiguang
-- 
========================================================
Weiguang Guan, Research Engineer
RHPCS, McMaster University
========================================================

On Mon, 20 Jun 2005, Karthik Krishnan wrote:

> If you don't want the datatype exposed in your specific function. You 
> could dynamic_cast to its base class, ImageBase in this case:
> 
> void ProcessAnyGenericImage( DataObject *someDataObject )
> {
>   const ImageBase< 3 > *myGenericImage = dynamic_cast< const ImageBase< 
> 3 > * >( someDataObject );
>   if( !myGenericImage ) //throw exception
> 
>   // Process myGenericImage
> }
> 
> But if you have a stand alone application, at some point you will have 
> to explicitly instantiate the class.
> 
> -karthik
> 
> Weiguang Guan wrote:
> 
> >Hi ITK users,
> >
> >I wonder if I could define a Pointer type of "generic" itk image or 
> >filter. By "generic" I mean the data type of itk image or filter is 
> >unknown, and it could be anything c++ legal type, e.g., unsigned char, 
> >short, int, float ...
> >
> >I've tried (This is something I want)
> >	typedef itk::Image GenericITKImageType;
> >	typedef typename GenericITKImageType::Pointer 
> >GenericITKImagePointer;
> >and compiler complained "invalid use of template-name ...". I just want to 
> >get rid of "<float, 3>" in typedef itk::Image<float, 3> GenericITKImageType;
> >
> >Does anyone have find a way to work this out? This is actually a c++ 
> >question, I think.
> >
> >Thanks in advance.
> >
> >Weiguang
> >
> >  
> >
> 

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