24 class G  class
31     G() : alive_(1) {++n_alive;}  in G()  function in G
32     G(const G& g) : alive_(g.alive_) {++n_alive;}  in G()  function in G
33     ~G() {alive_ = 0; --n_alive;}  in ~G()
43 int G::n_alive = 0;
44 bool G::op_run = false;
48     assert(G::n_alive == 0);  in main()
49     assert(!G::op_run);  in main()
51         G g;  in main()
52         assert(G::n_alive == 1);  in main()
53         assert(!G::op_run);  in main()
64         assert(G::n_alive == 1);  in main()
65         assert(G::op_run);  in main()
67     assert(G::n_alive == 0);  in main()
68     assert(G::op_run);  in main()