1 // Copyright (C) 2020-2021 Free Software Foundation, Inc.
2 //
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)
7 // any later version.
8
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.
13
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/>.
17
18 // { dg-options "-std=gnu++2a" }
19 // { dg-do run { target c++2a } }
20
21 #include <queue>
22 #include <testsuite_hooks.h>
23
24 void
test01()25 test01()
26 {
27 std::queue<int> c1{ {1, 2, 3} }, c2{ {1, 2, 3, 4} }, c3{ {1, 2, 4} };
28 VERIFY( c1 == c1 );
29 VERIFY( std::is_eq(c1 <=> c1) );
30 VERIFY( c1 < c2 );
31 VERIFY( std::is_lt(c1 <=> c2) );
32 VERIFY( c1 < c3 );
33 VERIFY( std::is_lt(c1 <=> c3) );
34 VERIFY( c2 < c3 );
35 VERIFY( std::is_lt(c2 <=> c3) );
36
37 static_assert( std::totally_ordered<std::queue<int>> );
38
39 static_assert( std::three_way_comparable<std::queue<int>,
40 std::strong_ordering> );
41 static_assert( ! std::three_way_comparable<std::queue<float>,
42 std::strong_ordering> );
43 static_assert( ! std::three_way_comparable<std::queue<float>,
44 std::weak_ordering> );
45 static_assert( std::three_way_comparable<std::queue<float>,
46 std::partial_ordering> );
47
48 struct E
49 {
50 bool operator==(E) { return true; }
51 };
52 static_assert( ! std::three_way_comparable<E> );
53 static_assert( ! std::three_way_comparable<std::queue<E>> );
54 }
55
56 int
main()57 main()
58 {
59 test01();
60 }
61