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// template<class U> bool owner_before(const shared_ptr<U>& b); 15 16#include <memory> 17#include <cassert> 18 19int main() 20{ 21 const std::shared_ptr<int> p1(new int); 22 const std::shared_ptr<int> p2 = p1; 23 const std::shared_ptr<int> p3(new int); 24 const std::weak_ptr<int> w1(p1); 25 const std::weak_ptr<int> w2(p2); 26 const std::weak_ptr<int> w3(p3); 27 assert(!w1.owner_before(p2)); 28 assert(!w2.owner_before(p1)); 29 assert(w1.owner_before(p3) || w3.owner_before(p1)); 30 assert(w3.owner_before(p1) == w3.owner_before(p2)); 31} 32