friend21.c

来自「gcc3.2.1源代码」· C语言 代码 · 共 31 行

// Build don't link:

template <class T> struct A {
  static void f();
};

template <class T> class B
{
  friend class A<T>;
  static int i; // ERROR - private
};

template <class T> class C
{
  template <class U>
  friend class A;

  static int i;
};

template <class T>
void A<T>::f()
{
  B<T>::i = 3;
  C<T>::i = 3;
  C<double>::i = 3;
  B<double>::i = 3; // ERROR - member `i' is private
}

template void A<int>::f(); // ERROR - instantiated from here