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52066eae | 1 | // { dg-do run { target c++11 } } |
664e12c1 | 2 | |
a5544970 | 3 | // Copyright (C) 2011-2019 Free Software Foundation, Inc. |
664e12c1 PC |
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 | // Tuple | |
21 | ||
22 | #include <tuple> | |
23 | #include <testsuite_hooks.h> | |
24 | ||
25 | void | |
26 | test01() | |
27 | { | |
664e12c1 PC |
28 | using namespace std; |
29 | ||
30 | VERIFY( tuple_size<const tuple<> >::value == 0 ); | |
31 | VERIFY( tuple_size<volatile tuple<int> >::value == 1 ); | |
32 | VERIFY( tuple_size<const volatile tuple<void> >::value == 1 ); | |
33 | ||
34 | typedef tuple<int, const int&, void> test_tuple1; | |
35 | VERIFY( tuple_size<const test_tuple1>::value == 3 ); | |
36 | VERIFY( tuple_size<const volatile test_tuple1>::value == 3 ); | |
37 | VERIFY( tuple_size<volatile tuple<tuple<void> > >::value == 1 ); | |
38 | } | |
39 | ||
40 | int main() | |
41 | { | |
42 | test01(); | |
43 | return 0; | |
44 | } | |
6ae2ae3b JW |
45 | |
46 | // LWG DR 2770. tuple_size<const T> specialization is not SFINAE compatible | |
47 | template<typename T, typename = void> | |
48 | struct has_value : std::false_type { }; | |
49 | ||
50 | template<typename T> | |
51 | struct has_value<T, std::__void_t<decltype(T::value)>> : std::true_type { }; | |
52 | ||
53 | static_assert( !has_value<std::tuple_size<int>>::value, "" ); | |
54 | static_assert( !has_value<std::tuple_size<const int>>::value, "" ); |