35 lines · cpp
1// RUN: %clang_cc1 -std=c++11 -verify %s2 3// expected-no-diagnostics4using size_t = decltype(sizeof(0));5 6template<typename T, typename U>7constexpr T max(T t, U u) { return t > u ? t : u; }8 9template<typename T, typename ...Ts>10constexpr auto max(T t, Ts ...ts) -> decltype(max(t, max(ts...))) {11 return max(t, max(ts...));12}13 14template<typename...T> struct my_union {15 alignas(T...) char buffer[max(sizeof(T)...)];16};17 18struct alignas(8) A { char c; };19struct alignas(4) B { short s; };20struct C { char a[16]; };21 22static_assert(sizeof(my_union<A, B, C>) == 16, "");23static_assert(alignof(my_union<A, B, C>) == 8, "");24 25namespace PR35028 {26 template<class X, int Alignment> struct alignas(X) alignas(long long) alignas(long double) alignas(Alignment) Aligned {27 union {28 long long align1;29 long double align2;30 char data[sizeof(X)];31 };32 };33 Aligned<int, 1> a;34}35