templates, inheritance and [] operator overloading

[Joachim]

Hello,
I have been trying to get the following code to work, but unfortunately
without any succes so far. I have searched in newsgroups and google but
found nothing there that could solve my problem.
Given the following classes :

template <class T>
class AAA{
int tabel[5];
public:
T &getItem(int i){
return tabel[i];
}
};

template <class T>
class A{
public:
AAA<T t;
T &operator[](int index) {
return t.getItem(index);
}

};

class B : public A<int{
public:
void Bfun(){
t[0]=4;
}
};

My gcc compiler comes with the following error:

main.cc27 : error: no match for 'operator[]' in
'((B*)this)->B::<anonymous>.A<int>::t[0]'
Is there anybody who could give me a hint in the right direction? I
tried nonmember functions (for the operator) but the compiler says that
operator[] should be a nonstatic member function.

Thanks in advance,

Joachim

[Ian Collins]

Joachim wrote:

Hello,
I have been trying to get the following code to work, but unfortunately
without any succes so far. I have searched in newsgroups and google but
found nothing there that could solve my problem.
Given the following classes :

template <class T>
class AAA{
int tabel[5];
public:
T &getItem(int i){
return tabel[i];
}
};

template <class T>
class A{
public:
AAA<T t;
T &operator[](int index) {
return t.getItem(index);
}

};

class B : public A<int{
public:
void Bfun(){
t[0]=4;
}
};

My gcc compiler comes with the following error:

main.cc27 : error: no match for 'operator[]' in
'((B*)this)->B::<anonymous>.A<int>::t[0]'

That's because AAA lacks an operator[]. try something like:

template <class T>
class AAA{
int tabel[5];
public:
T &getItem(int i){
return tabel[i];
}
int& operator[]( unsigned n ) { return tabel[5]; }
};
--
Ian Collins.

[Salt_Peter]

On May 10, 3:10 am, Joachim <[e-mail]:

Hello,
I have been trying to get the following code to work, but unfortunately
without any succes so far. I have searched in newsgroups and google but
found nothing there that could solve my problem.
Given the following classes :

template <class T>
class AAA{
int tabel[5];

T tabel[5];

public:
T &getItem(int i){

T& getItem( const size_t i ) {

return tabel[i];
}
};

template <class T>
class A{
public:
AAA<T t;
T &operator[](int index) {

T& operator[](const size_t index) {

return t.getItem(index);
}

};

class B : public A<int{
public:
void Bfun(){
t[0]=4;

operator[](0) = 4;
or
(*this)[0] = 4;

}

};

My gcc compiler comes with the following error:

main.cc27 : error: no match for 'operator[]' in
'((B*)this)->B::<anonymous>.A<int>::t[0]'

Is there anybody who could give me a hint in the right direction? I
tried nonmember functions (for the operator) but the compiler says that
operator[] should be a nonstatic member function.

Thanks in advance,

Joachim