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"typedef typename" inside template

1 New Member
Hi!

I have a question for u guys!
I would like to use the c++ package ITK (www.itk.org) for internal handling och data and functions in a dataset3D class of mine!

I also want to use a base class to be able to use all kinds of datasets (2D/3D/4D...)
-----------------------------------------------------------
class dataset_base{
public:
virtual void printDataInfo() =0;
DATASET_TYPE type;
string file_path;
};
-----------------------------------------------------------

But I need some help with the template part of my dataset class....
Today my class looks like this...

------------------dataset3D.h-----------------------------------------
#ifndef _dataset3D_h_
#define _dataset3D_h_
#pragma once

#include <string>
#include <stdio.h>
#include <iostream>
#include "itkImage.h "
#include "itkImageFileRe ader.h"
#include "dataset_base.h "
using namespace std;

template<class T>
class dataset3D: public dataset_base{
public:
typedef itk::Image<T,3> ImageType;
typedef typename ImageType::Poin ter ImagePointerTyp e;
typename int a;

dataset3D2(stri ng filepath);
void printDataInfo() ;

private:
ImagePointerTyp e theImage;

// int loadVolumeFromF ile(string file);
ImagePointerTyp e loadVolumeFromF ile(string file);
};

#include "dataset3D2.cpp "
#endif

------------------dataset3D.cpp-----------------------------------------

//template<class T> int dataset3D2<T>:: loadVolumeFromF ile(string file){

template<class T> dataset3D2<T>:: ImagePointerTyp e dataset3D2<T>:: loadVolumeFromF ile(string file){ //(***)
cout<<"load_v(" <<file<<")"<<en dl;
}
return image.GetPointe r();
}

-----------------------------------------------------------
But this gives following Compiler error in visual 7.1...
pointing at row (***)

Compiling...
dataset_array.c pp
c:\Joel\Code\IT KVTK\matrix\Src \Main\dataset3D 2.cpp(28) : warning C4346: 'dataset3D2<T>: :ImagePointerTy pe' : dependent name is not a type
prefix with 'typename' to indicate a type
.....
.....

What is it that I am doing wrong!
I thought that (typedef typename was enough...)
Thanks in advance...

// Joel
Sep 23 '05 #1
1 18984
BostonWill
1 New Member
Hey
It's been a long time since you posted this, but just in case you were wondering:

where you use
typedef typename ImageType::Poin ter ImagePointerTyp e;
(or any type name combination)
to use it as a return type for a function, you would need to specify that this is a typename, or in your example
template<class T>
typename dataset3D2<T>:: ImagePointerTyp e
dataset3D2<T>:: loadVolumeFromF ile(string file){ //(***)
etc. etc.
Notice the placement of the "typename" before the actual typenamed name
Mar 29 '06 #2

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