111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// The LLVM Compiler Infrastructure 411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// This file is dual licensed under the MIT and the University of Illinois Open 611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// Source Licenses. See LICENSE.TXT for details. 711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// <memory> 1111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// weak_ptr 1311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// template<class U> bool owner_before(const weak_ptr<U>& b); 1511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <memory> 1711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <cassert> 1811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1911cd02dfb91661c65134cac258cf5924270e9d2Dan Albertint main() 2011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 2111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::shared_ptr<int> p1(new int); 2211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::shared_ptr<int> p2 = p1; 2311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::shared_ptr<int> p3(new int); 2411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::weak_ptr<int> w1(p1); 2511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::weak_ptr<int> w2(p2); 2611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const std::weak_ptr<int> w3(p3); 2711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(!w1.owner_before(w2)); 2811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(!w2.owner_before(w1)); 2911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(w1.owner_before(w3) || w3.owner_before(w1)); 3011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(w3.owner_before(w1) == w3.owner_before(w2)); 3111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert} 32