[vdr] Re: VDR developer version 1.3.6

[Philip Lawatsch <philip@lawatsch.at>]

Marcel Wiesweg wrote:

> > I have to admit that I don't quite understand where the problem is here.
> > Why doesn't
> >
> >  T *l = (T *)First();
> >
> > work any more? After all, there is no other item named "First" anywhere
> > near. What am I missing?
>
> The changes are explained at http://gcc.gnu.org/gcc-3.4/changes.html
> section "C++".
> If I understand that correctly in a situation like
>
> template <class T > class Parent {
> public: int f();
> };
> ...
> int f();
> ...
> template <class T > class MyClass : public Parent {
> void xy() { f(); }
> }
>
> in xy() the global function f will be called.
> _Why_ this is done we will probably have to ask some g++ developer or Mr. 
> Stroustrup himself.
There are Situations where the compiler has little or no chance to find 
out what you're trying to use (its hard in case you use template 
specialisation).


template <typename foo>
class base
{
  void bar();
};

template <>
class base<int>
{
};

template <typename foo>
class derived : public base<foo>
{
public:

  void problem()
  {
     // which one ?
     bar();
  }
};

void bar();


somemethod:

derived<int> blubb;
blubb.bar();


Now its getting problematic for the compiler, he does not know if you 
want to use derived::bar or ::bar ...



kind regards Philip


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