1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <memory>
11 
12 // shared_ptr
13 
14 // template<class Y> explicit shared_ptr(const weak_ptr<Y>& r);
15 
16 #include <memory>
17 #include <cassert>
18 
19 struct B
20 {
21     static int count;
22 
BB23     B() {++count;}
BB24     B(const B&) {++count;}
~BB25     virtual ~B() {--count;}
26 };
27 
28 int B::count = 0;
29 
30 struct A
31     : public B
32 {
33     static int count;
34 
AA35     A() {++count;}
AA36     A(const A&) {++count;}
~AA37     ~A() {--count;}
38 };
39 
40 int A::count = 0;
41 
main()42 int main()
43 {
44     {
45         std::weak_ptr<A> wp;
46         try
47         {
48             std::shared_ptr<A> sp(wp);
49             assert(false);
50         }
51         catch (std::bad_weak_ptr&)
52         {
53         }
54         assert(A::count == 0);
55     }
56     {
57         std::shared_ptr<A> sp0(new A);
58         std::weak_ptr<A> wp(sp0);
59         std::shared_ptr<A> sp(wp);
60         assert(sp.use_count() == 2);
61         assert(sp.get() == sp0.get());
62         assert(A::count == 1);
63     }
64     assert(A::count == 0);
65     {
66         std::shared_ptr<A> sp0(new A);
67         std::weak_ptr<A> wp(sp0);
68         sp0.reset();
69         try
70         {
71             std::shared_ptr<A> sp(wp);
72             assert(false);
73         }
74         catch (std::bad_weak_ptr&)
75         {
76         }
77     }
78     assert(A::count == 0);
79 }
80