| Richard Smith | f6565a9 | 2013-02-22 08:32:16 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -std=c++11 -verify %s |
| 2 | |
| 3 | // expected-no-diagnostics |
| 4 | using size_t = decltype(sizeof(0)); |
| 5 | |
| 6 | template<typename T, typename U> |
| 7 | constexpr T max(T t, U u) { return t > u ? t : u; } |
| 8 | |
| 9 | template<typename T, typename ...Ts> |
| 10 | constexpr auto max(T t, Ts ...ts) -> decltype(max(t, max(ts...))) { |
| 11 | return max(t, max(ts...)); |
| 12 | } |
| 13 | |
| 14 | template<typename...T> struct my_union { |
| 15 | alignas(T...) char buffer[max(sizeof(T)...)]; |
| 16 | }; |
| 17 | |
| 18 | struct alignas(8) A { char c; }; |
| 19 | struct alignas(4) B { short s; }; |
| 20 | struct C { char a[16]; }; |
| 21 | |
| 22 | static_assert(sizeof(my_union<A, B, C>) == 16, ""); |
| 23 | static_assert(alignof(my_union<A, B, C>) == 8, ""); |