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 // ... fails assertion line 31 12 13 // <atomic> 14 15 // template <class T> 16 // T 17 // atomic_exchange(volatile atomic<T>* obj, T desr); 18 // 19 // template <class T> 20 // T 21 // atomic_exchange(atomic<T>* obj, T desr); 22 23 #include <atomic> 24 #include <type_traits> 25 #include <cassert> 26 27 #include "atomic_helpers.h" 28 29 template <class T> 30 struct TestFn { operator ()TestFn31 void operator()() const { 32 typedef std::atomic<T> A; 33 A t; 34 std::atomic_init(&t, T(1)); 35 assert(std::atomic_exchange(&t, T(2)) == T(1)); 36 assert(t == T(2)); 37 volatile A vt; 38 std::atomic_init(&vt, T(3)); 39 assert(std::atomic_exchange(&vt, T(4)) == T(3)); 40 assert(vt == T(4)); 41 } 42 }; 43 44 main()45int main() 46 { 47 TestEachAtomicType<TestFn>()(); 48 } 49