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 // explicit tuple(const T&...);
15 
16 #include <tuple>
17 #include <string>
18 #include <cassert>
19 
20 int main()
21 {
22     {
23         std::tuple<int> t(2);
24         assert(std::get<0>(t) == 2);
25     }
26 #if _LIBCPP_STD_VER > 11
27     {
28         constexpr std::tuple<int> t(2);
29         static_assert(std::get<0>(t) == 2, "");
30     }
31     {
32         constexpr std::tuple<int> t;
33         static_assert(std::get<0>(t) == 0, "");
34     }
35 #endif
36     {
37         std::tuple<int, char*> t(2, 0);
38         assert(std::get<0>(t) == 2);
39         assert(std::get<1>(t) == nullptr);
40     }
41 #if _LIBCPP_STD_VER > 11
42     {
43         constexpr std::tuple<int, char*> t(2, nullptr);
44         static_assert(std::get<0>(t) == 2, "");
45         static_assert(std::get<1>(t) == nullptr, "");
46     }
47 #endif
48     {
49         std::tuple<int, char*> t(2, nullptr);
50         assert(std::get<0>(t) == 2);
51         assert(std::get<1>(t) == nullptr);
52     }
53     {
54         std::tuple<int, char*, std::string> t(2, nullptr, "text");
55         assert(std::get<0>(t) == 2);
56         assert(std::get<1>(t) == nullptr);
57         assert(std::get<2>(t) == "text");
58     }
59     // extensions
60     {
61         std::tuple<int, char*, std::string> t(2);
62         assert(std::get<0>(t) == 2);
63         assert(std::get<1>(t) == nullptr);
64         assert(std::get<2>(t) == "");
65     }
66     {
67         std::tuple<int, char*, std::string> t(2, nullptr);
68         assert(std::get<0>(t) == 2);
69         assert(std::get<1>(t) == nullptr);
70         assert(std::get<2>(t) == "");
71     }
72     {
73         std::tuple<int, char*, std::string, double> t(2, nullptr, "text");
74         assert(std::get<0>(t) == 2);
75         assert(std::get<1>(t) == nullptr);
76         assert(std::get<2>(t) == "text");
77         assert(std::get<3>(t) == 0.0);
78     }
79 }
80