1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// GCC's __builtin_strlen isn't constexpr yet
// XFAIL: (gcc-10 || gcc-11) && !(c++11 || c++14 || c++17)
// UNSUPPORTED: LIBCXX-DEBUG-FIXME
// <string_view>
// size_type copy(charT* s, size_type n, size_type pos = 0) const;
// Throws: out_of_range if pos > size().
// Remarks: Let rlen be the smaller of n and size() - pos.
// Requires: [s, s+rlen) is a valid range.
// Effects: Equivalent to std::copy_n(begin() + pos, rlen, s).
// Returns: rlen.
#include <string_view>
#include <algorithm>
#include <cassert>
#include <stdexcept>
#include "test_macros.h"
template<typename CharT>
void test1 ( std::basic_string_view<CharT> sv, size_t n, size_t pos ) {
const size_t rlen = std::min ( n, sv.size() - pos );
CharT *dest1 = new CharT [rlen + 1]; dest1[rlen] = 0;
CharT *dest2 = new CharT [rlen + 1]; dest2[rlen] = 0;
if (pos > sv.size()) {
#ifndef TEST_HAS_NO_EXCEPTIONS
try {
sv.copy(dest1, n, pos);
assert(false);
} catch (const std::out_of_range&) {
} catch (...) {
assert(false);
}
#endif
} else {
sv.copy(dest1, n, pos);
std::copy_n(sv.begin() + pos, rlen, dest2);
for ( size_t i = 0; i <= rlen; ++i )
assert ( dest1[i] == dest2[i] );
}
delete [] dest1;
delete [] dest2;
}
template<typename CharT>
void test ( const CharT *s ) {
typedef std::basic_string_view<CharT> string_view_t;
string_view_t sv1 ( s );
test1(sv1, 0, 0);
test1(sv1, 1, 0);
test1(sv1, 20, 0);
test1(sv1, sv1.size(), 0);
test1(sv1, 20, string_view_t::npos);
test1(sv1, 0, 3);
test1(sv1, 2, 3);
test1(sv1, 100, 3);
test1(sv1, 100, string_view_t::npos);
test1(sv1, sv1.size(), string_view_t::npos);
test1(sv1, sv1.size() + 1, 0);
test1(sv1, sv1.size() + 1, 1);
test1(sv1, sv1.size() + 1, string_view_t::npos);
}
template<typename CharT>
TEST_CONSTEXPR_CXX20 bool test_constexpr_copy(const CharT *abcde, const CharT *ghijk, const CharT *bcdjk)
{
CharT buf[6] = {};
std::basic_string_view<CharT> lval(ghijk); lval.copy(buf, 6);
std::basic_string_view<CharT>(abcde).copy(buf, 3, 1);
assert(std::basic_string_view<CharT>(buf) == bcdjk);
return true;
}
int main(int, char**) {
test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
test ( "ABCDE");
test ( "a" );
test ( "" );
test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
test ( L"ABCDE" );
test ( L"a" );
test ( L"" );
#if TEST_STD_VER >= 11
test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
test ( u"ABCDE" );
test ( u"a" );
test ( u"" );
test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
test ( U"ABCDE" );
test ( U"a" );
test ( U"" );
#endif
test_constexpr_copy("ABCDE", "GHIJK", "BCDJK");
test_constexpr_copy(L"ABCDE", L"GHIJK", L"BCDJK");
#if TEST_STD_VER >= 11
test_constexpr_copy(u"ABCDE", u"GHIJK", u"BCDJK");
test_constexpr_copy(U"ABCDE", U"GHIJK", U"BCDJK");
#endif
#if TEST_STD_VER >= 17
test_constexpr_copy(u8"ABCDE", u8"GHIJK", u8"BCDJK");
#endif
#if TEST_STD_VER >= 20
static_assert(test_constexpr_copy("ABCDE", "GHIJK", "BCDJK"));
static_assert(test_constexpr_copy(L"ABCDE", L"GHIJK", L"BCDJK"));
static_assert(test_constexpr_copy(u"ABCDE", u"GHIJK", u"BCDJK"));
static_assert(test_constexpr_copy(U"ABCDE", U"GHIJK", U"BCDJK"));
static_assert(test_constexpr_copy(u8"ABCDE", u8"GHIJK", u8"BCDJK"));
#endif
return 0;
}
|
