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 // bool 23 // atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v, 24 // shared_ptr<T> w); 25 26 #include <memory> 27 #include <cassert> 28 main()29int main() 30 { 31 #if __has_feature(cxx_atomic) 32 { 33 std::shared_ptr<int> p(new int(4)); 34 std::shared_ptr<int> v(new int(3)); 35 std::shared_ptr<int> w(new int(2)); 36 bool b = std::atomic_compare_exchange_weak(&p, &v, w); 37 assert(b == false); 38 assert(*p == 4); 39 assert(*v == 4); 40 assert(*w == 2); 41 } 42 { 43 std::shared_ptr<int> p(new int(4)); 44 std::shared_ptr<int> v = p; 45 std::shared_ptr<int> w(new int(2)); 46 bool b = std::atomic_compare_exchange_weak(&p, &v, w); 47 assert(b == true); 48 assert(*p == 2); 49 assert(*v == 4); 50 assert(*w == 2); 51 } 52 #endif 53 } 54