Viewing file:  variadic12.C (1.12 KB) -rw-r--r--
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// { dg-do compile { target c++11 } }
// A tuple type
template<typename... Args> struct tuple { };
// Determine if two types are the same
template<typename T, typename U>
struct is_same {
static const bool value = false;
};
template<typename T>
struct is_same<T, T> {
static const bool value = true;
};
// Append 'T' to the end of Tuple
template<typename T, typename Tuple>
struct append_to_tuple;
template<typename T, typename... Args>
struct append_to_tuple<T, tuple<Args...> > {
typedef tuple<Args..., T> type;
};
// Reverse a sequence of arguments (and return the result as a tuple)
template<typename... Args> struct reverse;
template<typename T, typename... Args>
struct reverse<T, Args...> {
typedef typename append_to_tuple<T, typename reverse<Args...>::type>::type
type;
};
template<>
struct reverse<> {
typedef tuple<> type;
};
int a0[is_same<reverse<>::type, tuple<> >::value? 1 : -1];
int a1[is_same<reverse<int>::type, tuple<int> >::value? 1 : -1];
int a2[is_same<reverse<char, int>::type, tuple<int, char> >::value? 1 : -1];
int a3[is_same<reverse<char, int, long>::type, tuple<long, int, char> >::value? 1 : -1];
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