86 lines
2 KiB
C++
86 lines
2 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <atomic>
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// template <class T>
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// bool
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// atomic_compare_exchange_weak(volatile atomic<T>* obj, T* expc, T desr);
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//
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// template <class T>
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// bool
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// atomic_compare_exchange_weak(atomic<T>* obj, T* expc, T desr);
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#include <atomic>
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#include <type_traits>
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#include <cassert>
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template <class T>
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void
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test()
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{
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{
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typedef std::atomic<T> A;
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A a;
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T t(T(1));
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std::atomic_init(&a, t);
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assert(std::atomic_compare_exchange_weak(&a, &t, T(2)) == true);
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assert(a == T(2));
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assert(t == T(1));
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assert(std::atomic_compare_exchange_weak(&a, &t, T(3)) == false);
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assert(a == T(2));
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assert(t == T(2));
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}
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{
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typedef std::atomic<T> A;
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volatile A a;
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T t(T(1));
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std::atomic_init(&a, t);
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assert(std::atomic_compare_exchange_weak(&a, &t, T(2)) == true);
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assert(a == T(2));
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assert(t == T(1));
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assert(std::atomic_compare_exchange_weak(&a, &t, T(3)) == false);
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assert(a == T(2));
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assert(t == T(2));
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}
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}
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struct A
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{
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int i;
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explicit A(int d = 0) : i(d) {}
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friend bool operator==(const A& x, const A& y)
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{return x.i == y.i;}
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};
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int main()
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{
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test<A>();
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test<char>();
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test<signed char>();
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test<unsigned char>();
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test<short>();
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test<unsigned short>();
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test<int>();
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test<unsigned int>();
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test<long>();
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test<unsigned long>();
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test<long long>();
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test<unsigned long long>();
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test<wchar_t>();
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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test<char16_t>();
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test<char32_t>();
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#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
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test<int*>();
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test<const int*>();
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}
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