const_pointer_cast.pass.cpp revision c52f43e72dfcea03037729649da84c23b3beb04a 
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// shared_ptr
13
14// template<class T, class U> shared_ptr<T> const_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<const A> pA(new A);
47        std::shared_ptr<A> pB = std::const_pointer_cast<A>(pA);
48        assert(pB.get() == pA.get());
49        assert(!pB.owner_before(pA) && !pA.owner_before(pB));
50    }
51    {
52        const std::shared_ptr<const A> pA;
53        std::shared_ptr<A> pB = std::const_pointer_cast<A>(pA);
54        assert(pB.get() == pA.get());
55        assert(!pB.owner_before(pA) && !pA.owner_before(pB));
56    }
57}
58