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// weak_ptr 13 14// void swap(weak_ptr& r); 15 16#include <memory> 17#include <cassert> 18 19struct A 20{ 21 static int count; 22 23 A() {++count;} 24 A(const A&) {++count;} 25 ~A() {--count;} 26}; 27 28int A::count = 0; 29 30int main() 31{ 32 { 33 std::shared_ptr<A> p1(new A); 34 std::weak_ptr<A> w1(p1); 35 assert(w1.use_count() == 1); 36 w1.reset(); 37 assert(w1.use_count() == 0); 38 assert(p1.use_count() == 1); 39 } 40 assert(A::count == 0); 41} 42