How do I use a generic array class inside another class?

[emaghero]

I am trying to use the attached header file, which provides me with a generic way of declarating arrays and matrices of arbitrary size.

I would like to be able to use the classes Array and Matrix inside another class to perform calculations with arrays and matrices of type double and complex<double> . This second class, called LinAlgCalc, contains algorithms for solving A.x=b etc. I have attempted to define the class as follows

class LinAlgCalc
{
public:
	LinAlgCalc();
	
	//Member Functions
	//template <class T> void choldcmp(Matrix<T> &a,Matrix<T> &l,Array<T> &diag);
	
	template <class T> void func(Array<T> &x);
	
private:
	// Constants used for the calculations can go here if necessary
	
};

LinAlgCalc::LinAlgCalc()
{
	// Empty Constructor
}

template <class T> void LinAlgCalc::func(Array<T> &x)
{
	x.print();
}

I am using MSVC 2008 and when I build the project I get no errors, however, when I attempt to perform an operation on a declarated LinAlgCalc object inside main, as such, I get a linking error that I do not know how to fix.

int _tmain(int argc, _TCHAR* argv[])
{
Array<double> X(4);
X[1]=-0.2; X[2]=-0.32; X[3]=13.52; X[4]=14.17;

LinAlgCalc calcA; // declarate the object, no problem
	
calcA.func(X); // try to use the object and not so good
}

I cannot see why there is a problem. Am I using the template class incorrectly? Have I made a serious, or a stupid error? Any help would be greatly appreciated.

My class declaration is in a separate header file to the function definitions.

The error message I get when I try to build with the above code inside main is

------ Build started: Project: Linear_Algebra_ Codes, Configuration: Debug Win32 ------
Compiling...
stdafx.cpp
Compiling...
LinAlgCodes.cpp
Linear_Algebra_ Codes.cpp
Generating Code...
Linking...
Linear_Algebra_ Codes.obj : error LNK2019: unresolved external symbol "public: void __thiscall LinAlgCalc::fun c<double>(clas s Array<double> &)" (??$func@N@LinA lgCalc@@QAEXAAV ?$Array@N@@@Z) referenced in function _wmain
C:\Documents and Settings\Rob Sheehan\My Documents\See_P lus_Plus_Progra mming\Linear_Al gebra_Codes\Deb ug\Linear_Algeb ra_Codes.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://c:\Documents and Settings\Rob Sheehan\My Documents\See_P lus_Plus_Progra mming\Linear_Al gebra_Codes\Lin ear_Algebra_Cod es\Debug\BuildL og.htm"
Linear_Algebra_ Codes - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========