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 // template <class T> struct owner_less;
13 //
14 // template <class T>
15 // struct owner_less<shared_ptr<T> >
16 // : binary_function<shared_ptr<T>, shared_ptr<T>, bool>
17 // {
18 // typedef bool result_type;
19 // bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const;
20 // bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const;
21 // bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const;
22 // };
23 //
24 // template <class T>
25 // struct owner_less<weak_ptr<T> >
26 // : binary_function<weak_ptr<T>, weak_ptr<T>, bool>
27 // {
28 // typedef bool result_type;
29 // bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const;
30 // bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const;
31 // bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const;
32 // };
33
34 #include <memory>
35 #include <cassert>
36
main()37 int main()
38 {
39 const std::shared_ptr<int> p1(new int);
40 const std::shared_ptr<int> p2 = p1;
41 const std::shared_ptr<int> p3(new int);
42 const std::weak_ptr<int> w1(p1);
43 const std::weak_ptr<int> w2(p2);
44 const std::weak_ptr<int> w3(p3);
45
46 {
47 typedef std::owner_less<std::shared_ptr<int> > CS;
48 CS cs;
49
50 assert(!cs(p1, p2));
51 assert(!cs(p2, p1));
52 assert(cs(p1 ,p3) || cs(p3, p1));
53 assert(cs(p3, p1) == cs(p3, p2));
54
55 assert(!cs(p1, w2));
56 assert(!cs(p2, w1));
57 assert(cs(p1, w3) || cs(p3, w1));
58 assert(cs(p3, w1) == cs(p3, w2));
59 }
60 {
61 typedef std::owner_less<std::weak_ptr<int> > CS;
62 CS cs;
63
64 assert(!cs(w1, w2));
65 assert(!cs(w2, w1));
66 assert(cs(w1, w3) || cs(w3, w1));
67 assert(cs(w3, w1) == cs(w3, w2));
68
69 assert(!cs(w1, p2));
70 assert(!cs(w2, p1));
71 assert(cs(w1, p3) || cs(w3, p1));
72 assert(cs(w3, p1) == cs(w3, p2));
73 }
74 }
75