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 // void swap(weak_ptr& r);
14 
15 #include <memory>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 struct A
21 {
22     static int count;
23 
AA24     A() {++count;}
AA25     A(const A&) {++count;}
~AA26     ~A() {--count;}
27 };
28 
29 int A::count = 0;
30 
main(int,char **)31 int main(int, char**)
32 {
33     {
34         std::shared_ptr<A> p1(new A);
35         std::weak_ptr<A> w1(p1);
36         assert(w1.use_count() == 1);
37         w1.reset();
38         assert(w1.use_count() == 0);
39         assert(p1.use_count() == 1);
40     }
41     assert(A::count == 0);
42 
43   return 0;
44 }
45