[Insight-users] how to template the image dimension or vector dimesion in template function

[Baoyun Li]

Hi Andreas:

Thanks so much.

I understand why my program is wrong, but don not know the solution.

Thanks again.

baoyun




________________________________
From: Andreas Schuh <andreas.schuh.84 at googlemail.com>
To: Baoyun Li <baoyun_li123 at yahoo.com>
Cc: "insight-users at itk.org" <insight-users at itk.org>
Sent: Wednesday, March 18, 2009 4:33:29 PM
Subject: Re: how to template the image dimension or vector dimesion in template function

Hi Baoyun,

use the static constant itk::Vector::Dimension instead.

typedef typename itk::Vector< double, VectorPixelType::Dimension > MeasurementVectorType;

itk::Vector::GetVectorDimension() is a static method that has to be evaluated at runtime to get the number of components. For template arguments you need constant values that can be derived at compile time. itk::Vector::Dimension, therefore, is a public static const class member, instead.

--
regards
Andreas

Baoyun Li schrieb:
> Dear Andreas and all:
>  Can you please teach me how to template the image dimension or vector dimesion in template function.
>  In the following template function, if I give the vector dimension as
>  typedef typename itk::Vector< double,NumberOfComponents> MeasurementVectorType;
> where Numberof compoents is obtained as trait
> const unsigned int NumberOfComponents=VectorPixelType::GetVectorDimension();
>  The program cannot be build.
>  Why and how to solve the problem?
>  Thanks
>  Baoyun
>  template <unsigned int Dim,unsigned int NumberOfComponents1,class TInputFilter,  class TOutputFilter>
> void EMClustering( typename TInputFilter::Pointer& inputfilter, typename TOutputFilter::Pointer& outputfilter)
> {
>    typedef typename TInputFilter::PixelType VectorPixelType;
>    typedef typename TInputFilter::PixelType::SizeType Num;
>    const unsigned int NumberOfComponents=VectorPixelType::GetVectorDimension();
>    const unsigned int Dim1=TInputFilter::GetImageDimension();
>    typedef typename itk::Vector< double,NumberOfComponents> MeasurementVectorType;
>  typedef typename itk::Statistics::ListSample< MeasurementVectorType > SampleType;
>  // SampleType::Pointer sample = SampleType::New();
>  // sample->SetMeasurementVectorSize(NumberOfComponents );
>  // MeasurementVectorType mv;
>  };
>> ml>
> 


      
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