problems with g++ templates

[Bernhard Rückerl <bernhard_rueckerl at freenet dot de>]

Hello,

I have troubles with using class templates with g++ version 3.3.1

I have a file testt.h:

template<typename T>
class TestT
{
 private:
  T x;

 public:
  void setvalue( const T & px);
  T getvalue( );
};

and the according file testt.cpp:

#include "testt.h"


template<typename T>
void TestT<T>::setvalue(const T & px)
{
  x = px;
}


template<typename T>
T TestT<T>::getvalue( )
{
  return x;
}


And a file testmain.cpp with a main using this template class:

#include "testt.h"
#include <iostream>


main()
{
  TestT<double> w;
  w.setvalue( 2.0 );
  cout << w.getvalue( );
}
b

When I try to compile an link the programm with
g++ -o testmain -g testmain.cpp testt.cpp

I get the error message:
/tmp/cclxyVIZ.o(.text+0x2c): In function `main':
/home/bernhard/programme/test/testmain.cpp:8: undefined reference to
`TestT<double>::setvalue(double const&)'
/tmp/cclxyVIZ.o(.text+0x3e):/home/bernhard/programme/test/testmain.cpp:9:
undefined reference to `TestT<double>::getvalue()'

I also tried the options of g++ which seem relate to templates but I
always get these errors or the options are deprecated.
As I know my c++-code is correct. What can be the reason?

yours sincerely and thanks in advance
Bernhard Rückerl