1 // Copyright (C) 2016-2025 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 "-D_GLIBCXX_DEBUG" }
19 // { dg-do run { target c++11 } }
20 // { dg-skip-if "" { *-*-* } { "-D_GLIBCXX_PARALLEL" } }
24 #include <testsuite_iterators.h>
25 #include <testsuite_hooks.h>
27 using __gnu_test::test_container
;
28 using __gnu_test::forward_iterator_wrapper
;
34 bool odd() const { return val
% 2; }
36 // Partitioned so that all odd values come before even values:
37 bool operator<(const X
& x
) const { return this->odd() && !x
.odd(); }
43 // Test with range that is partitioned, but not sorted.
44 X seq
[] = { 1, 3, 5, 7, 1, 6, 4, 2 };
45 test_container
<X
, forward_iterator_wrapper
> c(seq
);
47 auto part1
= std::equal_range(c
.begin(), c
.end(), X
{2});
48 VERIFY( part1
.first
!= c
.end() && part1
.second
== c
.end() );
49 VERIFY( part1
.first
->val
== 6 );
50 auto part2
= std::equal_range(c
.begin(), c
.end(), X
{2}, std::less
<X
>{});
51 VERIFY( part2
.first
!= c
.end() && part1
.second
== c
.end() );
52 VERIFY( part2
.first
->val
== 6 );
54 auto part3
= std::equal_range(c
.begin(), c
.end(), X
{9});
55 VERIFY( part3
.first
== c
.begin() && part3
.second
!= c
.end() );
56 VERIFY( part3
.second
->val
== 6 );
57 auto part4
= std::equal_range(c
.begin(), c
.end(), X
{9}, std::less
<X
>{});
58 VERIFY( part4
.first
== c
.begin() && part4
.second
!= c
.end() );
59 VERIFY( part4
.second
->val
== 6 );