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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 
main()24 int main()
25 {
26     {
27         typedef std::tuple<double&, std::string, int> T;
28         double d = 1.5;
29         const T t(d, "high", 5);
30         assert(std::get<0>(t) == 1.5);
31         assert(std::get<1>(t) == "high");
32         assert(std::get<2>(t) == 5);
33         std::get<0>(t) = 2.5;
34         assert(std::get<0>(t) == 2.5);
35         assert(std::get<1>(t) == "high");
36         assert(std::get<2>(t) == 5);
37         assert(d == 2.5);
38 
39         std::get<1>(t) = "four";
40     }
41 }
42