enable_shared_from_this.pass.cpp revision f5256e16dfc425c1d466f6308d4026d529ce9e0b 
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// template<class T>
11// class enable_shared_from_this
12// {
13// protected:
14//     enable_shared_from_this();
15//     enable_shared_from_this(enable_shared_from_this const&);
16//     enable_shared_from_this& operator=(enable_shared_from_this const&);
17//     ~enable_shared_from_this();
18// public:
19//     shared_ptr<T> shared_from_this();
20//     shared_ptr<T const> shared_from_this() const;
21// };
22
23#include <memory>
24#include <cassert>
25
26struct T
27    : public std::enable_shared_from_this<T>
28{
29};
30
31struct Y : T {};
32
33struct Z : Y {};
34
35int main()
36{
37    {
38    std::shared_ptr<Y> p(new Z);
39    std::shared_ptr<T> q = p->shared_from_this();
40    assert(p == q);
41    assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
42    }
43    {
44    std::shared_ptr<Y> p = std::make_shared<Z>();
45    std::shared_ptr<T> q = p->shared_from_this();
46    assert(p == q);
47    assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
48    }
49}
50