Probleme template de classe c++

[Linker error] undefined reference to `Tableau<int>::Tableau(int)' 

#include <cstdlib>
#include <iostream>

using namespace std;

    template <class T>
    class Tableau{
          protected:
                    T *tab;
                    int dim;
          public:
                 Tableau();
                 Tableau(int);
                 void affiche();
                 
          };

template <class T>
    Tableau<T>::Tableau(){
                       dim=0;
                       tab=NULL;
                       }
    template <class T>
    Tableau<T>::Tableau(int n):dim(n){
                       tab=new T[dim];
                       }
    template <class T>
    void Tableau<T>::affiche(){
         for(int i=0;i<dim;i++){
                 cout<<tab[i]<<endl;
                 }
         }

#include <cstdlib>
#include <iostream>
#include "tableau.h"

using namespace std;

int main(int argc, char *argv[])
{
    Tableau<int> t(2);
    system("PAUSE");
    return EXIT_SUCCESS;
}