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99dee823 | 1 | // Copyright (C) 2017-2021 Free Software Foundation, Inc. |
2be7a166 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 | ||
18 | // { dg-do compile { target c++14 } } | |
19 | ||
20 | #include <experimental/string_view> | |
21 | ||
22 | struct constexpr_char_traits : std::char_traits<char> | |
23 | { | |
24 | static constexpr size_t | |
25 | length(const char* val) | |
26 | { | |
27 | size_t res = 0; | |
28 | for (; val[res] != '\0'; ++res) | |
29 | ; | |
30 | return res; | |
31 | } | |
32 | ||
33 | static constexpr int | |
34 | compare(const char* lhs, const char* rhs, std::size_t count) | |
35 | { | |
36 | for (size_t pos = 0; pos < count; ++pos) | |
37 | { | |
38 | if (lhs[pos] != rhs[pos]) | |
39 | return lhs[pos] - rhs[pos]; | |
40 | } | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static constexpr const char* | |
45 | find(const char* p, std::size_t n, char c) | |
46 | { | |
47 | for (size_t pos = 0; pos < n; ++pos) | |
48 | if (p[pos] == c) | |
49 | return p + pos; | |
50 | return nullptr; | |
51 | } | |
52 | }; | |
53 | ||
54 | using string_view | |
55 | = std::experimental::basic_string_view<char, constexpr_char_traits>; | |
56 | ||
57 | constexpr | |
58 | string_view get() | |
59 | { | |
60 | string_view res = "x::"; | |
61 | string_view start_pattern = "x"; | |
62 | res = res.substr(res.find(start_pattern) + start_pattern.size()); | |
63 | res = res.substr(0, res.find_first_of(";]")); | |
64 | res = res.substr(res.rfind("::")); | |
65 | return res; | |
66 | } | |
67 | ||
68 | static_assert( get() == get() ); |