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 #include <tuple>
19 #include <string>
20 #include <cassert>
21
22 struct Empty {};
23
main()24 int main()
25 {
26 {
27 typedef std::tuple<int> T;
28 const T t(3);
29 assert(std::get<0>(t) == 3);
30 }
31 {
32 typedef std::tuple<std::string, int> T;
33 const T t("high", 5);
34 assert(std::get<0>(t) == "high");
35 assert(std::get<1>(t) == 5);
36 }
37 #if _LIBCPP_STD_VER > 11
38 {
39 typedef std::tuple<double, int> T;
40 constexpr T t(2.718, 5);
41 static_assert(std::get<0>(t) == 2.718, "");
42 static_assert(std::get<1>(t) == 5, "");
43 }
44 {
45 typedef std::tuple<Empty> T;
46 constexpr T t{Empty()};
47 constexpr Empty e = std::get<0>(t);
48 }
49 #endif
50 {
51 typedef std::tuple<double&, std::string, int> T;
52 double d = 1.5;
53 const T t(d, "high", 5);
54 assert(std::get<0>(t) == 1.5);
55 assert(std::get<1>(t) == "high");
56 assert(std::get<2>(t) == 5);
57 std::get<0>(t) = 2.5;
58 assert(std::get<0>(t) == 2.5);
59 assert(std::get<1>(t) == "high");
60 assert(std::get<2>(t) == 5);
61 assert(d == 2.5);
62 }
63 }
64