| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // template <class T> struct owner_less; |
| // |
| // template <class T> |
| // struct owner_less<shared_ptr<T> > |
| // : binary_function<shared_ptr<T>, shared_ptr<T>, bool> |
| // { |
| // typedef bool result_type; |
| // bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const; |
| // bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const; |
| // bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const; |
| // }; |
| // |
| // template <class T> |
| // struct owner_less<weak_ptr<T> > |
| // : binary_function<weak_ptr<T>, weak_ptr<T>, bool> |
| // { |
| // typedef bool result_type; |
| // bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const; |
| // bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const; |
| // bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const; |
| // }; |
| |
| #include <memory> |
| #include <cassert> |
| |
| int main() |
| { |
| const std::shared_ptr<int> p1(new int); |
| const std::shared_ptr<int> p2 = p1; |
| const std::shared_ptr<int> p3(new int); |
| const std::weak_ptr<int> w1(p1); |
| const std::weak_ptr<int> w2(p2); |
| const std::weak_ptr<int> w3(p3); |
| |
| { |
| typedef std::owner_less<std::shared_ptr<int> > CS; |
| CS cs; |
| |
| assert(!cs(p1, p2)); |
| assert(!cs(p2, p1)); |
| assert(cs(p1 ,p3) || cs(p3, p1)); |
| assert(cs(p3, p1) == cs(p3, p2)); |
| |
| assert(!cs(p1, w2)); |
| assert(!cs(p2, w1)); |
| assert(cs(p1, w3) || cs(p3, w1)); |
| assert(cs(p3, w1) == cs(p3, w2)); |
| } |
| { |
| typedef std::owner_less<std::weak_ptr<int> > CS; |
| CS cs; |
| |
| assert(!cs(w1, w2)); |
| assert(!cs(w2, w1)); |
| assert(cs(w1, w3) || cs(w3, w1)); |
| assert(cs(w3, w1) == cs(w3, w2)); |
| |
| assert(!cs(w1, p2)); |
| assert(!cs(w2, p1)); |
| assert(cs(w1, p3) || cs(w3, p1)); |
| assert(cs(w3, p1) == cs(w3, p2)); |
| } |
| } |