| 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 | // weak_ptr |
| 12 | |
| 13 | // weak_ptr& operator=(const weak_ptr& r); |
| 14 | |
| 15 | #include <memory> |
| 16 | #include <type_traits> |
| 17 | #include <cassert> |
| 18 | #include <utility> |
| 19 | |
| 20 | #include "test_macros.h" |
| 21 | |
| 22 | struct B |
| 23 | { |
| 24 | static int count; |
| 25 | |
| 26 | B() {++count;} |
| 27 | B(const B&) {++count;} |
| 28 | virtual ~B() {--count;} |
| 29 | }; |
| 30 | |
| 31 | int B::count = 0; |
| 32 | |
| 33 | struct A |
| 34 | : public B |
| 35 | { |
| 36 | static int count; |
| 37 | |
| 38 | A() {++count;} |
| 39 | A(const A& other) : B(other) {++count;} |
| 40 | ~A() {--count;} |
| 41 | }; |
| 42 | |
| 43 | int A::count = 0; |
| 44 | |
| 45 | int main(int, char**) |
| 46 | { |
| 47 | { |
| 48 | const std::shared_ptr<A> ps(new A); |
| 49 | const std::weak_ptr<A> pA(ps); |
| 50 | { |
| 51 | std::weak_ptr<A> pB; |
| 52 | pB = pA; |
| 53 | assert(B::count == 1); |
| 54 | assert(A::count == 1); |
| 55 | assert(pB.use_count() == 1); |
| 56 | assert(pA.use_count() == 1); |
| 57 | } |
| 58 | assert(pA.use_count() == 1); |
| 59 | assert(B::count == 1); |
| 60 | assert(A::count == 1); |
| 61 | } |
| 62 | assert(B::count == 0); |
| 63 | assert(A::count == 0); |
| 64 | |
| 65 | { |
| 66 | const std::shared_ptr<A> ps(new A); |
| 67 | std::weak_ptr<A> pA(ps); |
| 68 | { |
| 69 | std::weak_ptr<A> pB; |
| 70 | pB = std::move(pA); |
| 71 | assert(B::count == 1); |
| 72 | assert(A::count == 1); |
| 73 | assert(pB.use_count() == 1); |
| 74 | } |
| 75 | assert(B::count == 1); |
| 76 | assert(A::count == 1); |
| 77 | } |
| 78 | assert(B::count == 0); |
| 79 | assert(A::count == 0); |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 |