| 1 | // RUN: %clang_cc1 -std=c++11 -verify %s |
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| 2 | |
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| 3 | // expected-no-diagnostics |
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| 4 | using size_t = decltype(sizeof(0)); |
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| 5 | |
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| 6 | template<typename T, typename U> |
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| 7 | constexpr T max(T t, U u) { return t > u ? t : u; } |
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| 8 | |
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| 9 | template<typename T, typename ...Ts> |
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| 10 | constexpr auto max(T t, Ts ...ts) -> decltype(max(t, max(ts...))) { |
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| 11 | return max(t, max(ts...)); |
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| 12 | } |
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| 13 | |
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| 14 | template<typename...T> struct my_union { |
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| 15 | alignas(T...) char buffer[max(sizeof(T)...)]; |
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| 16 | }; |
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| 17 | |
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| 18 | struct alignas(8) A { char c; }; |
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| 19 | struct alignas(4) B { short s; }; |
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| 20 | struct C { char a[16]; }; |
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| 21 | |
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| 22 | static_assert(sizeof(my_union<A, B, C>) == 16, ""); |
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| 23 | static_assert(alignof(my_union<A, B, C>) == 8, ""); |
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| 24 | |
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| 25 | namespace PR35028 { |
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| 26 | template<class X, int Alignment> struct alignas(X) alignas(long long) alignas(long double) alignas(Alignment) Aligned { |
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| 27 | union { |
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| 28 | long long align1; |
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| 29 | long double align2; |
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| 30 | char data[sizeof(X)]; |
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| 31 | }; |
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| 32 | }; |
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| 33 | Aligned<int, 1> a; |
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| 34 | } |
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| 35 | |
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