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 // <atomic> 11 12 // template <class T> 13 // T 14 // atomic_exchange(volatile atomic<T>* obj, T desr); 15 // 16 // template <class T> 17 // T 18 // atomic_exchange(atomic<T>* obj, T desr); 19 20 #include <atomic> 21 #include <type_traits> 22 #include <cassert> 23 24 template <class T> 25 void test()26test() 27 { 28 typedef std::atomic<T> A; 29 A t; 30 std::atomic_init(&t, T(1)); 31 assert(std::atomic_exchange(&t, T(2)) == T(1)); 32 assert(t == T(2)); 33 volatile A vt; 34 std::atomic_init(&vt, T(3)); 35 assert(std::atomic_exchange(&vt, T(4)) == T(3)); 36 assert(vt == T(4)); 37 } 38 39 struct A 40 { 41 int i; 42 AA43 explicit A(int d = 0) : i(d) {} 44 operator ==(const A & x,const A & y)45 friend bool operator==(const A& x, const A& y) 46 {return x.i == y.i;} 47 }; 48 main()49int main() 50 { 51 test<A>(); 52 test<char>(); 53 test<signed char>(); 54 test<unsigned char>(); 55 test<short>(); 56 test<unsigned short>(); 57 test<int>(); 58 test<unsigned int>(); 59 test<long>(); 60 test<unsigned long>(); 61 test<long long>(); 62 test<unsigned long long>(); 63 test<wchar_t>(); 64 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 65 test<char16_t>(); 66 test<char32_t>(); 67 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS 68 test<int*>(); 69 test<const int*>(); 70 } 71