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 // This test uses new symbols that were not defined in the libc++ shipped on 11 // darwin11 and darwin12: 12 // XFAIL: with_system_lib=x86_64-apple-darwin11 13 // XFAIL: with_system_lib=x86_64-apple-darwin12 14 15 // <memory> 16 17 // shared_ptr 18 19 // template <class T> 20 // bool 21 // atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 22 // shared_ptr<T> w, memory_order success, 23 // memory_order failure); 24 25 #include <memory> 26 #include <cassert> 27 28 int main() 29 { 30 #if __has_feature(cxx_atomic) 31 { 32 std::shared_ptr<int> p(new int(4)); 33 std::shared_ptr<int> v(new int(3)); 34 std::shared_ptr<int> w(new int(2)); 35 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w, 36 std::memory_order_seq_cst, 37 std::memory_order_seq_cst); 38 assert(b == false); 39 assert(*p == 4); 40 assert(*v == 4); 41 assert(*w == 2); 42 } 43 { 44 std::shared_ptr<int> p(new int(4)); 45 std::shared_ptr<int> v = p; 46 std::shared_ptr<int> w(new int(2)); 47 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w, 48 std::memory_order_seq_cst, 49 std::memory_order_seq_cst); 50 assert(b == true); 51 assert(*p == 2); 52 assert(*v == 4); 53 assert(*w == 2); 54 } 55 #endif 56 } 57