========== const call =========
call: void A::__leave() const
  JoinPoint::That is const: 0
  JoinPoint::Target is const: 1
exec: void A::__leave() const
  JoinPoint::That is const: 1
  JoinPoint::Target is const: 1
const leave
======== non-const call =======
call: void A::__leave()
  JoinPoint::That is const: 0
  JoinPoint::Target is const: 0
exec: void A::__leave()
  JoinPoint::That is const: 0
  JoinPoint::Target is const: 0
non-const leave