1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <tuple>
10
11// template <class... Types> class tuple;
12
13// template <size_t I, class... Types>
14// typename tuple_element<I, tuple<Types...> >::type const&
15// get(const tuple<Types...>& t);
16
17// UNSUPPORTED: c++03
18
19#include <tuple>
20#include <string>
21#include <cassert>
22
23int main(int, char**)
24{
25 {
26 typedef std::tuple<double&, std::string, int> T;
27 double d = 1.5;
28 const T t(d, "high", 5);
29 assert(std::get<0>(t) == 1.5);
30 assert(std::get<1>(t) == "high");
31 assert(std::get<2>(t) == 5);
32 std::get<0>(t: t) = 2.5;
33 assert(std::get<0>(t) == 2.5);
34 assert(std::get<1>(t) == "high");
35 assert(std::get<2>(t) == 5);
36 assert(d == 2.5);
37
38 std::get<1>(t: t) = "four";
39 }
40
41 return 0;
42}
43

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.compile.fail.cpp