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 <size_t I, class... Types>
15 // typename tuple_element<I, tuple<Types...> >::type const&
16 // get(const tuple<Types...>& t);
17
18 // UNSUPPORTED: c++98, c++03
19
20 #include <tuple>
21 #include <string>
22 #include <cassert>
23
24 struct Empty {};
25
main()26 int main()
27 {
28 {
29 typedef std::tuple<int> T;
30 const T t(3);
31 assert(std::get<0>(t) == 3);
32 }
33 {
34 typedef std::tuple<std::string, int> T;
35 const T t("high", 5);
36 assert(std::get<0>(t) == "high");
37 assert(std::get<1>(t) == 5);
38 }
39 #if _LIBCPP_STD_VER > 11
40 {
41 typedef std::tuple<double, int> T;
42 constexpr T t(2.718, 5);
43 static_assert(std::get<0>(t) == 2.718, "");
44 static_assert(std::get<1>(t) == 5, "");
45 }
46 {
47 typedef std::tuple<Empty> T;
48 constexpr T t{Empty()};
49 constexpr Empty e = std::get<0>(t);
50 ((void)e); // Prevent unused warning
51 }
52 #endif
53 {
54 typedef std::tuple<double&, std::string, int> T;
55 double d = 1.5;
56 const T t(d, "high", 5);
57 assert(std::get<0>(t) == 1.5);
58 assert(std::get<1>(t) == "high");
59 assert(std::get<2>(t) == 5);
60 std::get<0>(t) = 2.5;
61 assert(std::get<0>(t) == 2.5);
62 assert(std::get<1>(t) == "high");
63 assert(std::get<2>(t) == 5);
64 assert(d == 2.5);
65 }
66 }
67