Undefined Reference issue with C++ and Netbeans - c++

Question

I have the following files:
ListaEnc.hpp
#include "Elemento.hpp"
#include <cstdlib>
#include <iostream>
template<typename T>
class ListaEnc {
public:
ListaEnc();
~ListaEnc();
...
}
//Implementation:
template<typename T>
ListaEnc<T>::ListaEnc()
{
head = NULL;
size = 0;
}
template <class T>
ListaEnc<T>::~ListaEnc() {
}
main.cpp:
#include "ListaEnc.hpp"
using namespace std;
int main(int argc, char** argv)
{
ListaEnc<int>* teste = new ListaEnc<int>();
return 0;
}
Poligono.hpp
#ifndef POLIGONO_HPP
#define POLIGONO_HPP
#include "Ponto.hpp"
#include "ListaEnc.hpp"
#include <string>
using namespace std;
public:
//Construtores
Poligono(ListaEnc<Ponto> pontos, string nome);
Poligono(const Poligono& orig);
virtual ~Poligono();
//Metodos
string obterNome();
void adicionarPonto(Ponto);
ListaEnc<Ponto> obterPontos();
private:
ListaEnc<Ponto> pontos;
string nome;
};
#endif /* POLIGONO_HPP */
Poligono.cpp
#include "Poligono.hpp"
* Poligono::Poligono(ListaEnc<Ponto> pontos, string nome)
{
this->pontos = pontos;
this->nome = nome;
}
* Poligono::Poligono(const Poligono& orig) {
}
* Poligono::~Poligono() {
}
//Metodo
string Poligono::obterNome()
{
return this->nome;
}
ListaEnc<Ponto> Poligono::obterPontos()
{
return this->pontos;
}
void Poligono::adicionarPonto(Ponto p)
{
this->pontos.adiciona(p);
}
I get these compile errors on Poligono.cpp:
/home/mariana/NetBeansProjects/TrabalhoCG/Poligono.cpp:12: undefined reference to `ListaEnc::~ListaEnc()'
The destructor for ListaEnc is empty, but is implemented. Does anyone know how to solve this problem?
Edit: Added the implementation of constructor and destructor for ListaEnc. The error appears in the bit of code I added for Poligono.cpp, where ListaEnc is one of the parameters.
Edit2: I have added an asterisk to the points in Poligono.cpp where the error appears (The first constructor, second constructor and destructor)

Answer 1

Since you posted code that shows
#ifndef POLIGONO_HPP
#define POLIGONO_HPP
in Poligono.cpp, but you don't have the same in ListaEnc.hpp, I assume that you are missing include guards in that header?
Depending on what other code is included in Poligono.cpp, this could result in the definition of template ListaEnc twice. Under C++ standard if you break the one definition rule you may just get a linking error and no other diagnostic message.
So, maybe make sure that there are include guards in ListaEnc.hpp ?
If you post more code I will update this answer :)
Edit: Another suggestion, if it is having trouble finding the dtor definition of ListaEnc, you might try moving the implementation of it into the class body? This makes it less likely that a typo will cause it to be lost. Since all the code is in the header this really doesn't change anything otherwise.