Template Class ??

[ArbolOne]

namespace jme {
template <class T> class Data {
private:
T data;
int id;
public:
Data();
Data(T, const int);
virtual ~Data();
Data(const Data& other);
Data& operator=(const Data& other);
const int getId();
const T& getData() {
return data;
}
};

template <class T>
jme::Data<T>::Data() {}

template <class T>
jme::Data<T>::Data(T _data, const int _id) {
this->data = _data;
this->id = _id;
}
template <class T>
jme::Data<T>::~Data() {}

template <class T>
jme::Data<T>::Data(const Data& other) {
//copy ctor
}
template <class T>
jme::Data<T>&
jme::Data<T>::operator=(const Data& rhs) {
//if (this == &rhs) return *this; // handle self assignment
//assignment operator
this->T = rhs.T;
//this->id = rhs.id;
return *this;
}
template <class T>
const int jme::Data<T>::getId() {
return id;
}
---
int main(){
jme::Data d;
std::cout << "Hello world!" << std::endl;
return 0;
}

The above program gives me this error message:

-------------- Build: Debug in data ---------------

Linking console executable: bin\Debug\list.exe
obj\Debug\main.o: In function `main':
C:/.../main.cpp:8: undefined reference to `jme::Data<std::string>::Data()'

C:/.../main.cpp:10: undefined reference to `jme::Data<std::string>::~Data()'

C:/.../main.cpp:10: undefined reference to `jme::Data<std::string>::~Data()'

collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
3 errors, 0 warnings



What am I doing wrong?

[Sharwan Joram]

HTH--

I tried compiling the same at my machine, using Fedora Linux 17, gcc 4.7 , got this error:

test.cpp:47:15: error: missing template arguments before ‘d’
test.cpp:47:15: error: expected ‘;’ before ‘d’
test.cpp:48:5: error: ‘cout’ is not a member of ‘std’
test.cpp:48:36: error: ‘endl’ is not a member of ‘std’
test.cpp: At global scope:
test.cpp:50:1: error: expected ‘}’ at end of input

Changing : jme::Data <int> d; and including <iostream> makes it work !!