1 // Build don't link:
2 // GROUPS passed conversions
3 class A {};
4 
5 template <class TP>
6 class B
7 {
8   A &(*_f) (A &, TP);
9   TP _a;
10 public:
B(A & (* f)(A &,TP),TP a)11   B (A &(*f) (A &, TP), TP a) : _f (f), _a (a) {}
12   friend A &operator<< (A &o, const B<TP> &m)
13     { (*m._f) (o, m._a); return o; }
14 };
15 
16 A &setw (A &, int);
setw(int n)17 B<int> setw (int n)
18 {
19   return B<int> (setw, n);
20 }
21 
22 A x;
23 
f()24 void f ()
25 {
26   x << setw (2);
27 }
28