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 29template <class T> 30struct TestFn { 31 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 45int main() 46{ 47 TestEachAtomicType<TestFn>()(); 48} 49