ambiguous behaviour of a class template with specialised function

[machiel]

I have got the following code in my header file:

template <class TType>
class CTestTmpl
{
public:
           CTestTmpl() {};
          ~CTestTmpl() {};
   void    Get() const;
private:
};

template <class TType>
void
CTestTmpl<TType>::Get() const
{
      std::cout << "This is not specialized: " << std::endl;
}

Then, I have the following specialised function:

    template <>
    void
    CTestTmpl<int>::Get() const
    {
          std::cout << "This is a specialized implementation: " << std::endl;
    }

If I put this specialised function in a ".cc" file, and then call it from some main function, like this:

    int main()
    {
          CTestTmpl<int> intTmpl;   
          intTmpl.Get();
          CTestTmpl<float> floatTmpl;   
          floatTmpl.Get();
    }

it works as expected: The "intTmpl" uses the specialised function, and the "floatTmpl" uses the general function implementation. (The output is respectively: "This is a specialized implementation: " and "This is not specialized: ".)
However, if I put the CTestTmpl.o file in a lib, link to it from a different program, and execute the same code, both "intTmpl" and "floatTmpl" use the general function implementation. (The output is for both: "This is not specialized: ".)

On the other hand, if I put the specialised function in the header file, it will not compile in the "local code" (it complains the function is defined twice), but, when I compile only the class and put it in a lib, and link to it from the different program, now "intTmpl" correctly uses the specialised implementation and "floatTmpl" the general implementation. (With output respectively: "This is a specialized implementation: " and "This is not specialized: ".)

Could anybody explain to me what's going on here, please?
Where should I put the specialised function?
And, once I have specialised a function for one type (integer), do I have to specialise it for all types (float, double, ...)?

Best regards,

Machiel

[machiel]

Some people on an other forum just gave me the solution.

When adding the following to the header file (aka "explicit instantiation"), the code works fine when linking to in a lib:

template <>
void
CTestTmpl<int>::Get() const;