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a945c346 | 1 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
39bf4f14 JW |
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 | ||
d4ac20b0 | 18 | // { dg-do run { target c++20 } } |
39bf4f14 JW |
19 | |
20 | #include <ranges> | |
21 | #include <algorithm> | |
22 | #include <string> | |
23 | #include <cctype> | |
24 | #include <testsuite_hooks.h> | |
25 | ||
26 | namespace ranges = std::ranges; | |
27 | namespace views = std::views; | |
28 | using namespace std::literals; | |
29 | ||
30 | // P2017R1 "Conditionally borrowed ranges" | |
31 | auto trim(std::string const& s) { | |
32 | auto isalpha = [](unsigned char c){ return std::isalpha(c); }; | |
33 | auto b = ranges::find_if(s, isalpha); | |
34 | auto e = ranges::find_if(s | views::reverse, isalpha).base(); | |
35 | return ranges::subrange(b, e); | |
36 | } | |
37 | ||
38 | void | |
39 | test01() | |
40 | { | |
41 | VERIFY( ranges::equal( trim(" abc "), "abc"sv ) ); | |
42 | ||
43 | std::string s = "0123456789"; | |
44 | auto odd = [](char c){ return (c - '0') % 2; }; | |
45 | using namespace std::views; | |
46 | auto pos = ranges::find(s | take(5) | drop(1) | drop_while(odd), '2'); | |
47 | VERIFY( *pos == '2' ); | |
48 | ||
49 | static_assert( ranges::borrowed_range<decltype(s | reverse)> ); | |
50 | static_assert( ranges::borrowed_range<decltype(s | take(1))> ); | |
51 | static_assert( ranges::borrowed_range<decltype(s | drop(1))> ); | |
52 | static_assert( ranges::borrowed_range<decltype(s | drop_while(odd))> ); | |
53 | ||
54 | ranges::subrange r(s.begin(), s.cend()); | |
55 | static_assert( !ranges::common_range<decltype(r)> ); | |
56 | auto pos2 = ranges::find(r | views::common, '2'); | |
57 | VERIFY( *pos2 == '2' ); | |
58 | } | |
59 | ||
60 | void | |
61 | test02() | |
62 | { | |
63 | std::pair<int, std::string_view> a[2]{ {1,"two"}, {3,"four"}}; | |
64 | auto pos = ranges::find(a | views::values, "four"); | |
65 | VERIFY( *pos == "four" ); | |
66 | ||
67 | static_assert( ranges::borrowed_range<decltype(a | views::keys)> ); | |
68 | } | |
69 | ||
70 | int main() | |
71 | { | |
72 | test01(); | |
73 | test02(); | |
74 | } |