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 // <memory> 11 12 // shared_ptr 13 14 // template <class T> 15 // bool 16 // atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 17 // shared_ptr<T> w, memory_order success, 18 // memory_order failure); 19 20 #include <memory> 21 #include <cassert> 22 23 int main() 24 { 25 #if __has_feature(cxx_atomic) 26 { 27 std::shared_ptr<int> p(new int(4)); 28 std::shared_ptr<int> v(new int(3)); 29 std::shared_ptr<int> w(new int(2)); 30 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w, 31 std::memory_order_seq_cst, 32 std::memory_order_seq_cst); 33 assert(b == false); 34 assert(*p == 4); 35 assert(*v == 4); 36 assert(*w == 2); 37 } 38 { 39 std::shared_ptr<int> p(new int(4)); 40 std::shared_ptr<int> v = p; 41 std::shared_ptr<int> w(new int(2)); 42 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w, 43 std::memory_order_seq_cst, 44 std::memory_order_seq_cst); 45 assert(b == true); 46 assert(*p == 2); 47 assert(*v == 4); 48 assert(*w == 2); 49 } 50 #endif 51 } 52
