shared_ptr_Y.pass.cpp revision bc8d3f97eb5c958007f2713238472e0c1c8fe02c 
1//===----------------------------------------------------------------------===//
2//
3// ��������������������The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <memory>
11
12// weak_ptr
13
14// template<class Y> weak_ptr& operator=(const shared_ptr<Y>& r);
15
16#include <memory>
17#include <type_traits>
18#include <cassert>
19
20struct B
21{
22    static int count;
23
24    B() {++count;}
25    B(const B&) {++count;}
26    virtual ~B() {--count;}
27};
28
29int B::count = 0;
30
31struct A
32    : public B
33{
34    static int count;
35
36    A() {++count;}
37    A(const A&) {++count;}
38    ~A() {--count;}
39};
40
41int A::count = 0;
42
43int main()
44{
45    {
46        const std::shared_ptr<A> pA(new A);
47        {
48            std::weak_ptr<B> pB;
49            pB = pA;
50            assert(B::count == 1);
51            assert(A::count == 1);
52            assert(pB.use_count() == 1);
53            assert(pA.use_count() == 1);
54        }
55        assert(pA.use_count() == 1);
56        assert(B::count == 1);
57        assert(A::count == 1);
58    }
59    assert(B::count == 0);
60    assert(A::count == 0);
61}
62