before xml_attribute::operator void (*)(xml_attribute ***)() const
before void v1()
before const int r1()
  r-result: 1 [const]
before volatile int r2()
  r-result: 2 []
before const volatile int r3()
  r-result: 3 [const]
before int *r4()
  r-ptr-result: 0x12345 [*]
before const int *r5()
  r-ptr-result: 0x23456 [const *]
before const volatile int *r6()
  r-ptr-result: 0x34567 [const volatile *]
after int &p1()
  p-result: 21 []
after const int &p2()
  p-result: 22 [const]
after volatile int &p3()
  p-result: 23 []
after const volatile int &p4()
  p-result: 24 [const]