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&
16 // get(tuple<Types...>& t);
17
18 // UNSUPPORTED: c++98, c++03
19
20 #include <tuple>
21 #include <string>
22 #include <cassert>
23
24 #if __cplusplus > 201103L
25
26 struct Empty {};
27
28 struct S {
29 std::tuple<int, Empty> a;
30 int k;
31 Empty e;
SS32 constexpr S() : a{1,Empty{}}, k(std::get<0>(a)), e(std::get<1>(a)) {}
33 };
34
getP()35 constexpr std::tuple<int, int> getP () { return { 3, 4 }; }
36 #endif
37
main()38 int main()
39 {
40 {
41 typedef std::tuple<int> T;
42 T t(3);
43 assert(std::get<0>(t) == 3);
44 std::get<0>(t) = 2;
45 assert(std::get<0>(t) == 2);
46 }
47 {
48 typedef std::tuple<std::string, int> T;
49 T t("high", 5);
50 assert(std::get<0>(t) == "high");
51 assert(std::get<1>(t) == 5);
52 std::get<0>(t) = "four";
53 std::get<1>(t) = 4;
54 assert(std::get<0>(t) == "four");
55 assert(std::get<1>(t) == 4);
56 }
57 {
58 typedef std::tuple<double&, std::string, int> T;
59 double d = 1.5;
60 T t(d, "high", 5);
61 assert(std::get<0>(t) == 1.5);
62 assert(std::get<1>(t) == "high");
63 assert(std::get<2>(t) == 5);
64 std::get<0>(t) = 2.5;
65 std::get<1>(t) = "four";
66 std::get<2>(t) = 4;
67 assert(std::get<0>(t) == 2.5);
68 assert(std::get<1>(t) == "four");
69 assert(std::get<2>(t) == 4);
70 assert(d == 2.5);
71 }
72 #if _LIBCPP_STD_VER > 11
73 { // get on an rvalue tuple
74 static_assert ( std::get<0> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 0, "" );
75 static_assert ( std::get<1> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 1, "" );
76 static_assert ( std::get<2> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 2, "" );
77 static_assert ( std::get<3> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 3, "" );
78 static_assert(S().k == 1, "");
79 static_assert(std::get<1>(getP()) == 4, "");
80 }
81 #endif
82
83 }
84