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 #include "test_macros.h"
25
26 struct Empty {};
27
main()28 int main()
29 {
30 {
31 typedef std::tuple<int> T;
32 const T t(3);
33 assert(std::get<0>(t) == 3);
34 }
35 {
36 typedef std::tuple<std::string, int> T;
37 const T t("high", 5);
38 assert(std::get<0>(t) == "high");
39 assert(std::get<1>(t) == 5);
40 }
41 #if TEST_STD_VER > 11
42 {
43 typedef std::tuple<double, int> T;
44 constexpr T t(2.718, 5);
45 static_assert(std::get<0>(t) == 2.718, "");
46 static_assert(std::get<1>(t) == 5, "");
47 }
48 {
49 typedef std::tuple<Empty> T;
50 constexpr T t{Empty()};
51 constexpr Empty e = std::get<0>(t);
52 ((void)e); // Prevent unused warning
53 }
54 #endif
55 {
56 typedef std::tuple<double&, std::string, int> T;
57 double d = 1.5;
58 const T t(d, "high", 5);
59 assert(std::get<0>(t) == 1.5);
60 assert(std::get<1>(t) == "high");
61 assert(std::get<2>(t) == 5);
62 std::get<0>(t) = 2.5;
63 assert(std::get<0>(t) == 2.5);
64 assert(std::get<1>(t) == "high");
65 assert(std::get<2>(t) == 5);
66 assert(d == 2.5);
67 }
68 }
69