owner_before_weak_ptr.pass.cpp revision c52f43e72dfcea03037729649da84c23b3beb04a 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. 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);
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(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