1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <memory>
10 
11 // shared_ptr
12 
13 // template<class T, class U> shared_ptr<T> dynamic_pointer_cast(const shared_ptr<U>& r) noexcept;
14 // template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U>&& r) noexcept;
15 
16 // UNSUPPORTED: no-rtti
17 
18 #include <cassert>
19 #include <memory>
20 #include <type_traits>
21 #include <utility>
22 
23 #include "test_macros.h"
24 
25 struct B
26 {
27     static int count;
28 
BB29     B() {++count;}
BB30     B(const B&) {++count;}
~BB31     virtual ~B() {--count;}
32 };
33 
34 int B::count = 0;
35 
36 struct A
37     : public B
38 {
39     static int count;
40 
AA41     A() {++count;}
AA42     A(const A& other) : B(other) {++count;}
~AA43     ~A() {--count;}
44 };
45 
46 int A::count = 0;
47 
main(int,char **)48 int main(int, char**)
49 {
50     {
51         const std::shared_ptr<B> pB(new A);
52         ASSERT_NOEXCEPT(std::dynamic_pointer_cast<A>(pB));
53         std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
54         assert(pA.get() == pB.get());
55         assert(!pB.owner_before(pA) && !pA.owner_before(pB));
56     }
57     {
58         const std::shared_ptr<B> pB(new B);
59         std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
60         assert(pA.get() == 0);
61         assert(pA.use_count() == 0);
62     }
63 #if TEST_STD_VER > 14
64     {
65       const std::shared_ptr<B[8]> pB(new B[8]);
66       std::shared_ptr<A[8]> pA = std::dynamic_pointer_cast<A[8]>(pB);
67       assert(pA.get() == 0);
68       assert(pA.use_count() == 0);
69     }
70 #endif // TEST_STD_VER > 14
71 #if TEST_STD_VER > 20
72     {
73       A* pA_raw = new A;
74       std::shared_ptr<B> pB(pA_raw);
75       ASSERT_NOEXCEPT(std::dynamic_pointer_cast<A>(std::move(pB)));
76       std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(std::move(pB));
77       assert(pB.get() == nullptr);
78       assert(pA.get() == pA_raw);
79       assert(pA.use_count() == 1);
80     }
81 #endif // TEST_STD_VER > 20
82 
83     return 0;
84 }
85