How do I use template class methods? C++

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C++

Windows

templates

I want to create a class that stores undefined number of variables of any type (or their pointers actually).

What I have tried:

// ThEz.hpp
using namespace std;

class ThEz
{
    private:
        map <string, void*> mx_;
    public:
        void add( string name, void * ag );
        template <typename T> T get( string name );
};

// ThEz.cpp
// set method looks alright
template <typename T> T ThEz::get( string name ) {
    T * rv = (T*) mx_[name];
    return *rv;
}

// main.cpp
int x = 50;
    ThEz th1;
    th1.add( "hello", &x );

    int y = th1.get<int>("hello"); //error here

    cout << y;

Compiler (GNU GCC) says:
undefined reference to `int ThEz::get<int>(std::string)'