On May 15, 2006, at 9:15 PM, Bar-Tov Aharon-R53349 wrote:
hello,
something that seems like a problem (havn't found something in the
bug base).
template <class T>
class t_base
{
public:
T *ptr;
};
template <class T>
class t_derived : public t_base<T>
{
public:
t_derived() { ptr = NULL; }
};
This is described on the changes page for 3.4:
http://gcc.gnu.org/gcc-3.4/changes.html:
In a template definition, unqualified names will no longer find
members of a dependent base (as specified by [temp.dep]/3 in the C++
standard). For example,
template <typename T> struct B {
int m;
int n;
int f ();
int g ();
};
int n;
int g ();
template <typename T> struct C : B<T> {
void h ()
{
m = 0; // error
f (); // error
n = 0; // ::n is modified
g (); // ::g is called
}
};
You must make the names dependent, e.g. by prefixing them with this-
>. Here is the corrected definition of C<T>::h,
template <typename T> void C<T>::h ()
{
this->m = 0;
this->f ();
this->n = 0
this->g ();
}
As an alternative solution (unfortunately not backwards compatible
with GCC 3.3), you may use using declarations instead of this->:
template <typename T> struct C : B<T> {
using B<T>::m;
using B<T>::f;
using B<T>::n;
using B<T>::g;
void h ()
{
m = 0;
f ();
n = 0;
g ();
}
};
-- Pinski
