Linker probs with template classes

[Werner Modenbach]

Hi there!

Maybe there is someone who can give me a hint on my problem (I spent allready
days on it :-(( )

I have a sinple template class for a circular array and I reduced it to a
minimum:
-----------------------------------------------
circularArray.h:

template <class T>
class circularArray {
public: 
	circularArray(int size) : arraySize(size){};
	~circularArray(){};
protected:
   T* Elements;
   int arraySize;
};

-----------------------------------------------
main.cpp:

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream.h>
#include <stdlib.h>
#include <circularArray.h>

int main(int argc, char** argv){

circularArray<int> a(10);

cout << "Hello, World!" << endl;
return EXIT_SUCCESS;
}
-----------------------------------------------

The program works fine so far. 
If i change the definition of the constructor to:

-----------------------------------------------
in circularArray.h:
	circularArray(int size);
-----------------------------------------------

Create circularArray.cpp: 

#include <circularArray.h>

template <class T>
circularArray<T>::circularArray(int size){
      arraySize = size;
}

The following messages apear in the log window:

c++ -DHAVE_CONFIG_H -I. -I. -I..     -O0 -g3 -Wall -c circularArray.cpp
c++ -DHAVE_CONFIG_H -I. -I. -I..     -O0 -g3 -Wall -c main.cpp
c++  -O0 -g3 -Wall  -o circular_test  circularArray.o main.o  
main.o: In function `circularArray<int>::~circularArray(void)':
/home/werner/circular_test/circular_test/circularArray.h:17: undefined reference
to `circularArray<int>::circularArray(int)' gmake: *** [circular_test] Error 1
*** Fehler ***

circularArray.h:17 is the line where the destructor is defined;
	~circularArray(){};

If I define more methods of the class everything is fine as far as I define
everything in the headerfile. 

Sorry for the OT question! I really have no idea.

- Werner -

--
---------------------------------------
Werner Modenbach		 modenbach at alc.de
ALC Computertechnik GmbH	 http://www.alc.de