1 // Copyright (C) 2019-2021 Free Software Foundation, Inc.
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
18 // { dg-options "-std=gnu++2a" }
19 // { dg-do compile { target c++2a } }
23 template<typename Cat
, typename
... T
>
24 constexpr bool check()
26 return std::same_as
<Cat
, std::common_comparison_category_t
<T
...>>;
29 using std::partial_ordering
;
30 using std::weak_ordering
;
31 using std::strong_ordering
;
33 static_assert(check
<strong_ordering
>());
34 static_assert(check
<void, int>());
35 static_assert(check
<void, int, int>());
36 static_assert(check
<void, weak_ordering
, int>());
37 static_assert(check
<void, int, partial_ordering
>());
38 static_assert(check
<partial_ordering
, partial_ordering
>());
39 static_assert(check
<partial_ordering
, weak_ordering
, partial_ordering
>());
41 using PO
= std::partial_ordering
;
42 using WO
= std::weak_ordering
;
43 using SO
= std::strong_ordering
;
45 static_assert(check
<PO
, SO
, PO
, SO
, SO
>());
46 static_assert(check
<PO
, SO
, PO
, SO
, WO
>());
47 static_assert(check
<WO
, SO
, WO
, SO
, WO
>());
48 static_assert(check
<SO
, SO
, SO
, SO
, SO
>());