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// UNSUPPORTED: libcpp-has-no-threads
11//
12// This test uses new symbols that were not defined in the libc++ shipped on
13// darwin11 and darwin12:
14// XFAIL: with_system_cxx_lib=x86_64-apple-darwin11
15// XFAIL: with_system_cxx_lib=x86_64-apple-darwin12
16
17// <memory>
18
19// shared_ptr
20
21// template <class T>
22// shared_ptr<T>
23// atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r)
24
25#include <memory>
26#include <cassert>
27
28int main()
29{
30#if __has_feature(cxx_atomic)
31    {
32        std::shared_ptr<int> p(new int(4));
33        std::shared_ptr<int> r(new int(3));
34        r = std::atomic_exchange_explicit(&p, r, std::memory_order_seq_cst);
35        assert(*p == 3);
36        assert(*r == 4);
37    }
38#endif
39}
40