//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <memory> // weak_ptr // template<class U> bool owner_before(const weak_ptr<U>& b); #include <memory> #include <cassert> int main() { const std::shared_ptr<int> p1(new int); const std::shared_ptr<int> p2 = p1; const std::shared_ptr<int> p3(new int); const std::weak_ptr<int> w1(p1); const std::weak_ptr<int> w2(p2); const std::weak_ptr<int> w3(p3); assert(!w1.owner_before(w2)); assert(!w2.owner_before(w1)); assert(w1.owner_before(w3) || w3.owner_before(w1)); assert(w3.owner_before(w1) == w3.owner_before(w2)); }