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70483.cc
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1// Copyright (C) 2017-2023 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++17" }
19// { dg-do compile { target c++17 } }
20
21#include <string_view>
22
23struct constexpr_char_traits : std::char_traits<char>
24{
25 static constexpr size_t
26 length(const char* val)
27 {
28 size_t res = 0;
29 for (; val[res] != '\0'; ++res)
30 ;
31 return res;
32 }
33
34 static constexpr int
35 compare(const char* lhs, const char* rhs, std::size_t count)
36 {
37 for (size_t pos = 0; pos < count; ++pos)
38 {
39 if (lhs[pos] != rhs[pos])
40 return lhs[pos] - rhs[pos];
41 }
42 return 0;
43 }
44};
45
46using string_view = std::basic_string_view<char, constexpr_char_traits>;
47
48constexpr
50{
51 string_view res = "x::";
52 string_view start_pattern = "x";
53 res = res.substr(res.find(start_pattern) + start_pattern.size());
54 res = res.substr(0, res.find_first_of(";]"));
55 res = res.substr(res.rfind("::"));
56 return res;
57}
58
59static_assert( get() == get() );
60
61using std::u16string_view;
62
63constexpr
64u16string_view get16()
65{
66 u16string_view res = u"x::";
67 u16string_view start_pattern = u"x";
68 res = res.substr(res.find(start_pattern) + start_pattern.size());
69 res = res.substr(0, res.find_first_of(u";]"));
70 res = res.substr(res.rfind(u"::"));
71 return res;
72}
73
74static_assert( get16() == get16() );
75
76using std::u32string_view;
77
78constexpr
79u32string_view get32()
80{
81 u32string_view res = U"x::";
82 u32string_view start_pattern = U"x";
83 res = res.substr(res.find(start_pattern) + start_pattern.size());
84 res = res.substr(0, res.find_first_of(U";]"));
85 res = res.substr(res.rfind(U"::"));
86 return res;
87}
88
89static_assert( get32() == get32() );
constexpr string_view get()
Definition 70483.cc:49
constexpr u32string_view get32()
Definition 70483.cc:79
std::basic_string_view< char, constexpr_char_traits > string_view
Definition 70483.cc:46
constexpr u16string_view get16()
Definition 70483.cc:64
static constexpr size_t length(const char *val)
Definition 70483.cc:26
static constexpr int compare(const char *lhs, const char *rhs, std::size_t count)
Definition 70483.cc:35