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 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 // UNSUPPORTED: libcpp-no-deduction-guides
12 
13 // template<class T> class shared_ptr
14 
15 // shared_ptr(weak_ptr<T>) -> shared_ptr<T>
16 // shared_ptr(unique_ptr<T>) -> shared_ptr<T>
17 
18 #include <memory>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
23 struct A {};
24 
25 struct D {
26   void operator()(A* ptr) const
27   {
28     delete ptr;
29   }
30 };
31 
32 int main(int, char**)
33 {
34   {
35     std::shared_ptr<A> s0(new A);
36     std::weak_ptr<A> w = s0;
37     auto s = std::shared_ptr(w);
38     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
39     assert(s0.use_count() == 2);
40     assert(s.use_count() == 2);
41     assert(s0.get() == s.get());
42   }
43   {
44     std::unique_ptr<A> u(new A);
45     A* const uPointee = u.get();
46     std::shared_ptr s = std::move(u);
47     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
48     assert(u == nullptr);
49     assert(s.get() == uPointee);
50   }
51   {
52     std::unique_ptr<A, D> u(new A, D{});
53     A* const uPointee = u.get();
54     std::shared_ptr s(std::move(u));
55     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
56     assert(u == nullptr);
57     assert(s.get() == uPointee);
58   }
59 
60   return 0;
61 }
62