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++03, c++11, c++14
11 
12 // template<class T> class shared_ptr
13 
14 // shared_ptr(weak_ptr<T>) -> shared_ptr<T>
15 // shared_ptr(unique_ptr<T>) -> shared_ptr<T>
16 
17 #include <memory>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 struct A {};
23 
24 struct D {
25   void operator()(A* ptr) const
26   {
27     delete ptr;
28   }
29 };
30 
31 int main(int, char**)
32 {
33   {
34     std::shared_ptr<A> s0(new A);
35     std::weak_ptr<A> w = s0;
36     auto s = std::shared_ptr(w);
37     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
38     assert(s0.use_count() == 2);
39     assert(s.use_count() == 2);
40     assert(s0.get() == s.get());
41   }
42   {
43     std::unique_ptr<A> u(new A);
44     A* const uPointee = u.get();
45     std::shared_ptr s = std::move(u);
46     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
47     assert(u == nullptr);
48     assert(s.get() == uPointee);
49   }
50   {
51     std::unique_ptr<A, D> u(new A, D{});
52     A* const uPointee = u.get();
53     std::shared_ptr s(std::move(u));
54     ASSERT_SAME_TYPE(decltype(s), std::shared_ptr<A>);
55     assert(u == nullptr);
56     assert(s.get() == uPointee);
57   }
58 
59   return 0;
60 }
61