1 // { dg-do run { target c++11 } }
2
3 // Copyright (C) 2011-2020 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
19
20 #include <tuple>
21 #include <type_traits>
22 #include <testsuite_hooks.h>
23
24 template<typename T>
copy(T && x)25 typename std::decay<T>::type copy(T&& x)
26 { return std::forward<T>(x); }
27
28 template<typename... Args1, typename... Args2>
29 void
check_tuple_cat(std::tuple<Args1...> t1,std::tuple<Args2...> t2)30 check_tuple_cat(std::tuple<Args1...> t1, std::tuple<Args2...> t2)
31 {
32 typedef std::tuple<Args1..., Args2...> concatenated;
33
34 auto cat1 = std::tuple_cat( t1, t2 );
35 auto cat2 = std::tuple_cat(copy(t1), t2 );
36 auto cat3 = std::tuple_cat( t1, copy(t2));
37 auto cat4 = std::tuple_cat(copy(t1), copy(t2));
38
39 static_assert( std::is_same<decltype(cat1), concatenated>::value, "" );
40 static_assert( std::is_same<decltype(cat2), concatenated>::value, "" );
41 static_assert( std::is_same<decltype(cat3), concatenated>::value, "" );
42 static_assert( std::is_same<decltype(cat4), concatenated>::value, "" );
43
44 VERIFY( cat1 == cat2 );
45 VERIFY( cat1 == cat3 );
46 VERIFY( cat1 == cat4 );
47 }
48
49 // libstdc++/48476
test01()50 void test01()
51 {
52 int i = 0;
53 std::tuple<> t0;
54 std::tuple<int&> t1(i);
55 std::tuple<int&, int> t2(i, 0);
56 std::tuple<int const&, int, double> t3(i, 0, 0);
57
58 check_tuple_cat(t0, t0);
59 check_tuple_cat(t0, t1);
60 check_tuple_cat(t0, t2);
61 check_tuple_cat(t0, t3);
62
63 check_tuple_cat(t1, t0);
64 check_tuple_cat(t1, t1);
65 check_tuple_cat(t1, t2);
66 check_tuple_cat(t1, t3);
67
68 check_tuple_cat(t2, t0);
69 check_tuple_cat(t2, t1);
70 check_tuple_cat(t2, t2);
71 check_tuple_cat(t2, t3);
72
73 check_tuple_cat(t3, t0);
74 check_tuple_cat(t3, t1);
75 check_tuple_cat(t3, t2);
76 check_tuple_cat(t3, t3);
77 }
78
main()79 int main()
80 {
81 test01();
82 return 0;
83 }
84