44 Message* history = NULL;  variable
49   A(): mynum(num++) { *history << "A" << mynum << " ctor\n"; }  in A()
50   virtual ~A() { *history << "A" << mynum << " dtor\n"; }  in ~A()
51   virtual void Use() { *history << "A" << mynum << " use\n"; }  in Use()
59   B() { *history << "B" << mynum << " ctor\n"; }  in B()
60   ~B() { *history << "B" << mynum << " dtor\n"; }  in ~B()
61   virtual void Use() { *history << "B" << mynum << " use\n"; }  in Use()
68     history = new Message;  in LinkedPtrTest()
72     delete history;  in ~LinkedPtrTest()
73     history = NULL;  in ~LinkedPtrTest()
151     history->GetString().c_str());  in TEST_F()