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 #include "test_macros.h"
25
26 #if TEST_STD_VER > 11
27
28 struct Empty {};
29
30 struct S {
31 std::tuple<int, Empty> a;
32 int k;
33 Empty e;
SS34 constexpr S() : a{1,Empty{}}, k(std::get<0>(a)), e(std::get<1>(a)) {}
35 };
36
getP()37 constexpr std::tuple<int, int> getP () { return { 3, 4 }; }
38 #endif
39
main()40 int main()
41 {
42 {
43 typedef std::tuple<int> T;
44 T t(3);
45 assert(std::get<0>(t) == 3);
46 std::get<0>(t) = 2;
47 assert(std::get<0>(t) == 2);
48 }
49 {
50 typedef std::tuple<std::string, int> T;
51 T t("high", 5);
52 assert(std::get<0>(t) == "high");
53 assert(std::get<1>(t) == 5);
54 std::get<0>(t) = "four";
55 std::get<1>(t) = 4;
56 assert(std::get<0>(t) == "four");
57 assert(std::get<1>(t) == 4);
58 }
59 {
60 typedef std::tuple<double&, std::string, int> T;
61 double d = 1.5;
62 T t(d, "high", 5);
63 assert(std::get<0>(t) == 1.5);
64 assert(std::get<1>(t) == "high");
65 assert(std::get<2>(t) == 5);
66 std::get<0>(t) = 2.5;
67 std::get<1>(t) = "four";
68 std::get<2>(t) = 4;
69 assert(std::get<0>(t) == 2.5);
70 assert(std::get<1>(t) == "four");
71 assert(std::get<2>(t) == 4);
72 assert(d == 2.5);
73 }
74 #if TEST_STD_VER > 11
75 { // get on an rvalue tuple
76 static_assert ( std::get<0> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 0, "" );
77 static_assert ( std::get<1> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 1, "" );
78 static_assert ( std::get<2> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 2, "" );
79 static_assert ( std::get<3> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 3, "" );
80 static_assert(S().k == 1, "");
81 static_assert(std::get<1>(getP()) == 4, "");
82 }
83 #endif
84
85 }
86