1760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org//===----------------------------------------------------------------------===// 2760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// 3760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// The LLVM Compiler Infrastructure 4760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// 5760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// This file is dual licensed under the MIT and the University of Illinois Open 6760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// Source Licenses. See LICENSE.TXT for details. 7760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// 8760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org//===----------------------------------------------------------------------===// 9760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 10760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// <memory> 11760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 12760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// weak_ptr 13760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 14760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org// template<class U> bool owner_before(const weak_ptr<U>& b); 15760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 16760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org#include <memory> 17760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org#include <cassert> 18760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 19760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.orgint main() 20760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org{ 21760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org const std::shared_ptr<int> p1(new int); 22760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org const std::shared_ptr<int> p2 = p1; 23760fd893ba809a7a5daa25c2749ff502f7186e83kbr@chromium.org 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(w2)); 28 assert(!w2.owner_before(w1)); 29 assert(w1.owner_before(w3) || w3.owner_before(w1)); 30 assert(w3.owner_before(w1) == w3.owner_before(w2)); 31} 32