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 weak_ptr<U>& b) const noexcept; 15 16#include <memory> 17#include <cassert> 18#include "test_macros.h" 19 20int main() 21{ 22 const std::shared_ptr<int> p1(new int); 23 const std::shared_ptr<int> p2 = p1; 24 const std::shared_ptr<int> p3(new int); 25 const std::weak_ptr<int> w1(p1); 26 const std::weak_ptr<int> w2(p2); 27 const std::weak_ptr<int> w3(p3); 28 assert(!w1.owner_before(w2)); 29 assert(!w2.owner_before(w1)); 30 assert(w1.owner_before(w3) || w3.owner_before(w1)); 31 assert(w3.owner_before(w1) == w3.owner_before(w2)); 32 ASSERT_NOEXCEPT(w1.owner_before(w2)); 33} 34