Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Howard Hinnant | b64f8b0 | 2010-11-16 22:09:02 +0000 | [diff] [blame] | 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 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 | |
| 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 | |
Marshall Clow | b152983 | 2015-01-07 20:54:51 +0000 | [diff] [blame] | 50 | static_assert((std::is_same<std::shared_ptr<int>, CS::first_argument_type>::value), "" ); |
| 51 | static_assert((std::is_same<std::shared_ptr<int>, CS::second_argument_type>::value), "" ); |
| 52 | static_assert((std::is_same<bool, CS::result_type>::value), "" ); |
| 53 | |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 54 | assert(!cs(p1, p2)); |
| 55 | assert(!cs(p2, p1)); |
| 56 | assert(cs(p1 ,p3) || cs(p3, p1)); |
| 57 | assert(cs(p3, p1) == cs(p3, p2)); |
| 58 | |
| 59 | assert(!cs(p1, w2)); |
| 60 | assert(!cs(p2, w1)); |
| 61 | assert(cs(p1, w3) || cs(p3, w1)); |
| 62 | assert(cs(p3, w1) == cs(p3, w2)); |
| 63 | } |
| 64 | { |
| 65 | typedef std::owner_less<std::weak_ptr<int> > CS; |
| 66 | CS cs; |
| 67 | |
Marshall Clow | b152983 | 2015-01-07 20:54:51 +0000 | [diff] [blame] | 68 | static_assert((std::is_same<std::weak_ptr<int>, CS::first_argument_type>::value), "" ); |
| 69 | static_assert((std::is_same<std::weak_ptr<int>, CS::second_argument_type>::value), "" ); |
| 70 | static_assert((std::is_same<bool, CS::result_type>::value), "" ); |
| 71 | |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 72 | assert(!cs(w1, w2)); |
| 73 | assert(!cs(w2, w1)); |
| 74 | assert(cs(w1, w3) || cs(w3, w1)); |
| 75 | assert(cs(w3, w1) == cs(w3, w2)); |
| 76 | |
| 77 | assert(!cs(w1, p2)); |
| 78 | assert(!cs(w2, p1)); |
| 79 | assert(cs(w1, p3) || cs(w3, p1)); |
| 80 | assert(cs(w3, p1) == cs(w3, p2)); |
| 81 | } |
| 82 | } |