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, class Alloc>
15 //   struct uses_allocator<tuple<Types...>, Alloc> : true_type { };
16 
17 #include <tuple>
18 #include <type_traits>
19 
20 struct A {};
21 
22 int main()
23 {
24     {
25         typedef std::tuple<> T;
26         static_assert((std::is_base_of<std::true_type,
27                                        std::uses_allocator<T, A>>::value), "");
28     }
29     {
30         typedef std::tuple<int> T;
31         static_assert((std::is_base_of<std::true_type,
32                                        std::uses_allocator<T, A>>::value), "");
33     }
34     {
35         typedef std::tuple<char, int> T;
36         static_assert((std::is_base_of<std::true_type,
37                                        std::uses_allocator<T, A>>::value), "");
38     }
39     {
40         typedef std::tuple<double&, char, int> T;
41         static_assert((std::is_base_of<std::true_type,
42                                        std::uses_allocator<T, A>>::value), "");
43     }
44 }
45