| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| // weak_ptr |
| |
| // template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) |
| |
| #include <memory> |
| #include <cassert> |
| |
| struct A |
| { |
| static int count; |
| |
| A() {++count;} |
| A(const A&) {++count;} |
| ~A() {--count;} |
| }; |
| |
| int A::count = 0; |
| |
| int main() |
| { |
| { |
| A* ptr1 = new A; |
| A* ptr2 = new A; |
| std::shared_ptr<A> p1(ptr1); |
| std::weak_ptr<A> w1(p1); |
| { |
| std::shared_ptr<A> p2(ptr2); |
| std::weak_ptr<A> w2(p2); |
| swap(w1, w2); |
| assert(w1.use_count() == 1); |
| assert(w1.lock().get() == ptr2); |
| assert(w2.use_count() == 1); |
| assert(w2.lock().get() == ptr1); |
| assert(A::count == 2); |
| } |
| } |
| assert(A::count == 0); |
| } |