1 // Copyright (C) 2020 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 <algorithm>
22 #include <testsuite_hooks.h>
23 #include <testsuite_iterators.h>
24
25 using __gnu_test::test_container;
26 using __gnu_test::test_range;
27 using __gnu_test::input_iterator_wrapper;
28 using __gnu_test::output_iterator_wrapper;
29 using __gnu_test::forward_iterator_wrapper;
30
31 namespace ranges = std::ranges;
32
33 void
test01()34 test01()
35 {
36 const int c[6] = { 1, 2, 3, 4, 5, 6 };
37
38 {
39 int x[6] = { 7, 8, 9, 4, 5, 6 };
40 int a = 1;
41 VERIFY( ranges::generate_n(x, 3, [&] { return a++; }) == x+3 );
42 VERIFY( ranges::equal(x, c) );
43 }
44
45 {
46 int x[6] = { 7, 8, 9, 4, 5, 6 };
47 int a = 1;
48 test_container<int, forward_iterator_wrapper> cx(x);
49 VERIFY( *ranges::generate_n(cx.begin(), 3, [&] { return a++; })
50 == 4 );
51 VERIFY( ranges::equal(cx, c) );
52 }
53
54 {
55 int x[6] = { 7, 8, 9, 4, 5, 6 };
56 int a = 1;
57 test_range<int, output_iterator_wrapper> rx(x);
58 ranges::generate_n(ranges::begin(rx), 3, [&] { return a++; });
59 VERIFY( ranges::equal(x, c) );
60 }
61 }
62
63 constexpr bool
test02()64 test02()
65 {
66 bool ok = true;
67 int c[6] = { 1, 2, 3, 4, 5, 6 };
68 int x[6];
69 int a = 1;
70 ranges::generate_n(x, 6, [&] { return a++; });
71 ok &= ranges::equal(x, c);
72 ranges::generate_n(c, 0, [] { return -1; });
73 ok &= ranges::equal(x, c);
74 ranges::generate_n(c, -2, [] { return -1; });
75 ok &= ranges::equal(x, c);
76 return ok;
77 }
78
79 int
main()80 main()
81 {
82 test01();
83 static_assert(test02());
84 }
85