1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <tuple>
11
12// template <class... Types> class tuple;
13
14// template <class... Types>
15//   class tuple_size<tuple<Types...>>
16//     : public integral_constant<size_t, sizeof...(Types)> { };
17
18// XFAIL: gcc-4.9
19// UNSUPPORTED: c++98, c++03
20
21#include <tuple>
22#include <array>
23#include <type_traits>
24
25template <class T, size_t Size = sizeof(std::tuple_size<T>)>
26constexpr bool is_complete(int) { static_assert(Size > 0, ""); return true; }
27template <class> constexpr bool is_complete(long) { return false; }
28template <class T> constexpr bool is_complete() { return is_complete<T>(0); }
29
30struct Dummy1 {};
31struct Dummy2 {};
32
33namespace std {
34template <> class tuple_size<Dummy1> : public integral_constant<size_t, 0> {};
35}
36
37template <class T>
38void test_complete() {
39  static_assert(is_complete<T>(), "");
40  static_assert(is_complete<const T>(), "");
41  static_assert(is_complete<volatile T>(), "");
42  static_assert(is_complete<const volatile T>(), "");
43}
44
45template <class T>
46void test_incomplete() {
47  static_assert(!is_complete<T>(), "");
48  static_assert(!is_complete<const T>(), "");
49  static_assert(!is_complete<volatile T>(), "");
50  static_assert(!is_complete<const volatile T>(), "");
51}
52
53
54int main()
55{
56  test_complete<std::tuple<> >();
57  test_complete<std::tuple<int&> >();
58  test_complete<std::tuple<int&&, int&, void*>>();
59  test_complete<std::pair<int, long> >();
60  test_complete<std::array<int, 5> >();
61  test_complete<Dummy1>();
62
63  test_incomplete<void>();
64  test_incomplete<int>();
65  test_incomplete<std::tuple<int>&>();
66  test_incomplete<Dummy2>();
67}
68