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// PR c++/79960
// { dg-do compile { target c++11 } }
using size_t = decltype(sizeof(0));
template<typename T> struct tuple_size;
template<typename T, size_t U = tuple_size<T>::value>
using __has_tuple_size = T;
template<typename T> struct tuple_size<const __has_tuple_size<T>> {
static constexpr size_t value = tuple_size<T>::value;
};
template<typename T> struct tuple_size<volatile __has_tuple_size<T>> {
static constexpr size_t value = tuple_size<T>::value;
};
template<typename T> struct tuple_size<const __has_tuple_size<volatile T>> {
static constexpr size_t value = tuple_size<T>::value;
};
template<typename... T> struct tuple { };
template<typename... T> struct tuple_size<tuple<T...>> {
static constexpr size_t value = sizeof...(T);
};
static_assert( tuple_size<const tuple<>>::value == 0, "" ); // OK
static_assert( tuple_size<volatile tuple<>>::value == 0, "" ); // OK
static_assert( tuple_size<const volatile tuple<>>::value == 0, "" ); // FAIL
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