get_const.fail.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
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
22int main()
23{
24    {
25        typedef std::tuple<double&, std::string, int> T;
26        double d = 1.5;
27        const T t(d, "high", 5);
28        assert(std::get<0>(t) == 1.5);
29        assert(std::get<1>(t) == "high");
30        assert(std::get<2>(t) == 5);
31        std::get<0>(t) = 2.5;
32        assert(std::get<0>(t) == 2.5);
33        assert(std::get<1>(t) == "high");
34        assert(std::get<2>(t) == 5);
35        assert(d == 2.5);
36
37        std::get<1>(t) = "four";
38    }
39}
40