dynamic_pointer_cast.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <memory>
11
12// shared_ptr
13
14// template<class T, class U> shared_ptr<T> dynamic_pointer_cast(const shared_ptr<U>& 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<B> pB(new A);
47        std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
48        assert(pA.get() == pB.get());
49        assert(!pB.owner_before(pA) && !pA.owner_before(pB));
50    }
51    {
52        const std::shared_ptr<B> pB(new B);
53        std::shared_ptr<A> pA = std::dynamic_pointer_cast<A>(pB);
54        assert(pA.get() == 0);
55        assert(pA.use_count() == 0);
56    }
57}
58