heritage et template

Bonjour,

je ne comprends pas pourquoi ce code ne compile pas avec g++, pourtant B
herite de A.

$ g++ -c C.cpp
In file included from C.cpp:1:
B.hpp:25: error: no `void B<T>::insert(const T&)' member function
declared in class `B<T>'
B.hpp:25: error: template definition of non-template `void
B<T>::insert(const T&)'

Fichier C.cpp
-----------------
#include "B.hpp"

int main(int argc, char *argv[])
{
B<int> toto;

toto.insert(5);

return 0;
}
-----------------

Fichier B.hpp
-----------------
#ifndef B_hpp
#define B_hpp

#include "A.hpp"

template <class T> class B : public A<T>
{
public:
B(unsigned int n=100);
~B();
private:
B(const B&);
B& operator=(const B&);
};

template <class T> B<T>::B(unsigned int n) : A<T>(n)
{
}

template <class T> B<T>::~B()
{
}

template <class T> void B<T>::insert(const T& anElt)
{
}

#endif
------------------

Fichier A.hpp
------------------
#ifndef A_hpp
#define A_hpp

template <class T> class A
{
public:
A(unsigned int n=100);
~A();
void insert(const T& anElt);
private:
A(const A&);
A& operator=(const A&);
};

template <class T> A<T>::A(unsigned int n)
{
}

template <class T> A<T>::~A()
{
}

template <class T> void A<T>::insert(const T& anElt)
{
}

#endif
------------------

--