1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
10 
11 // <string_view>
12 
13 // constexpr size_type find(const charT* s, size_type pos, size_type n) const;
14 
15 #include <string_view>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "constexpr_char_traits.h"
20 
21 template <class S>
22 void
test(const S & s,const typename S::value_type * str,typename S::size_type pos,typename S::size_type n,typename S::size_type x)23 test(const S& s, const typename S::value_type* str, typename S::size_type pos,
24      typename S::size_type n, typename S::size_type x)
25 {
26     LIBCPP_ASSERT_NOEXCEPT(s.find(str, pos, n));
27     assert(s.find(str, pos, n) == x);
28     if (x != S::npos)
29         assert(pos <= x && x + n <= s.size());
30 }
31 
32 template <class S>
test0()33 void test0()
34 {
35     test(S(""), "", 0, 0, 0);
36     test(S(""), "abcde", 0, 0, 0);
37     test(S(""), "abcde", 0, 1, S::npos);
38     test(S(""), "abcde", 0, 2, S::npos);
39     test(S(""), "abcde", 0, 4, S::npos);
40     test(S(""), "abcde", 0, 5, S::npos);
41     test(S(""), "abcdeabcde", 0, 0, 0);
42     test(S(""), "abcdeabcde", 0, 1, S::npos);
43     test(S(""), "abcdeabcde", 0, 5, S::npos);
44     test(S(""), "abcdeabcde", 0, 9, S::npos);
45     test(S(""), "abcdeabcde", 0, 10, S::npos);
46     test(S(""), "abcdeabcdeabcdeabcde", 0, 0, 0);
47     test(S(""), "abcdeabcdeabcdeabcde", 0, 1, S::npos);
48     test(S(""), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
49     test(S(""), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
50     test(S(""), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
51     test(S(""), "", 1, 0, S::npos);
52     test(S(""), "abcde", 1, 0, S::npos);
53     test(S(""), "abcde", 1, 1, S::npos);
54     test(S(""), "abcde", 1, 2, S::npos);
55     test(S(""), "abcde", 1, 4, S::npos);
56     test(S(""), "abcde", 1, 5, S::npos);
57     test(S(""), "abcdeabcde", 1, 0, S::npos);
58     test(S(""), "abcdeabcde", 1, 1, S::npos);
59     test(S(""), "abcdeabcde", 1, 5, S::npos);
60     test(S(""), "abcdeabcde", 1, 9, S::npos);
61     test(S(""), "abcdeabcde", 1, 10, S::npos);
62     test(S(""), "abcdeabcdeabcdeabcde", 1, 0, S::npos);
63     test(S(""), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
64     test(S(""), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
65     test(S(""), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
66     test(S(""), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
67     test(S("abcde"), "", 0, 0, 0);
68     test(S("abcde"), "abcde", 0, 0, 0);
69     test(S("abcde"), "abcde", 0, 1, 0);
70     test(S("abcde"), "abcde", 0, 2, 0);
71     test(S("abcde"), "abcde", 0, 4, 0);
72     test(S("abcde"), "abcde", 0, 5, 0);
73     test(S("abcde"), "abcdeabcde", 0, 0, 0);
74     test(S("abcde"), "abcdeabcde", 0, 1, 0);
75     test(S("abcde"), "abcdeabcde", 0, 5, 0);
76     test(S("abcde"), "abcdeabcde", 0, 9, S::npos);
77     test(S("abcde"), "abcdeabcde", 0, 10, S::npos);
78     test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
79     test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
80     test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
81     test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
82     test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
83     test(S("abcde"), "", 1, 0, 1);
84     test(S("abcde"), "abcde", 1, 0, 1);
85     test(S("abcde"), "abcde", 1, 1, S::npos);
86     test(S("abcde"), "abcde", 1, 2, S::npos);
87     test(S("abcde"), "abcde", 1, 4, S::npos);
88     test(S("abcde"), "abcde", 1, 5, S::npos);
89     test(S("abcde"), "abcdeabcde", 1, 0, 1);
90     test(S("abcde"), "abcdeabcde", 1, 1, S::npos);
91     test(S("abcde"), "abcdeabcde", 1, 5, S::npos);
92     test(S("abcde"), "abcdeabcde", 1, 9, S::npos);
93     test(S("abcde"), "abcdeabcde", 1, 10, S::npos);
94     test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
95     test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
96     test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
97     test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
98     test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
99     test(S("abcde"), "", 2, 0, 2);
100     test(S("abcde"), "abcde", 2, 0, 2);
101     test(S("abcde"), "abcde", 2, 1, S::npos);
102     test(S("abcde"), "abcde", 2, 2, S::npos);
103     test(S("abcde"), "abcde", 2, 4, S::npos);
104     test(S("abcde"), "abcde", 2, 5, S::npos);
105     test(S("abcde"), "abcdeabcde", 2, 0, 2);
106     test(S("abcde"), "abcdeabcde", 2, 1, S::npos);
107     test(S("abcde"), "abcdeabcde", 2, 5, S::npos);
108     test(S("abcde"), "abcdeabcde", 2, 9, S::npos);
109     test(S("abcde"), "abcdeabcde", 2, 10, S::npos);
110     test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 0, 2);
111     test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 1, S::npos);
112     test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 10, S::npos);
113     test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 19, S::npos);
114     test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 20, S::npos);
115     test(S("abcde"), "", 4, 0, 4);
116     test(S("abcde"), "abcde", 4, 0, 4);
117     test(S("abcde"), "abcde", 4, 1, S::npos);
118     test(S("abcde"), "abcde", 4, 2, S::npos);
119     test(S("abcde"), "abcde", 4, 4, S::npos);
120     test(S("abcde"), "abcde", 4, 5, S::npos);
121     test(S("abcde"), "abcdeabcde", 4, 0, 4);
122     test(S("abcde"), "abcdeabcde", 4, 1, S::npos);
123     test(S("abcde"), "abcdeabcde", 4, 5, S::npos);
124     test(S("abcde"), "abcdeabcde", 4, 9, S::npos);
125     test(S("abcde"), "abcdeabcde", 4, 10, S::npos);
126     test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 0, 4);
127     test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 1, S::npos);
128     test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 10, S::npos);
129     test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 19, S::npos);
130     test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 20, S::npos);
131     test(S("abcde"), "", 5, 0, 5);
132     test(S("abcde"), "abcde", 5, 0, 5);
133     test(S("abcde"), "abcde", 5, 1, S::npos);
134     test(S("abcde"), "abcde", 5, 2, S::npos);
135 }
136 
137 template <class S>
test1()138 void test1()
139 {
140     test(S("abcde"), "abcde", 5, 4, S::npos);
141     test(S("abcde"), "abcde", 5, 5, S::npos);
142     test(S("abcde"), "abcdeabcde", 5, 0, 5);
143     test(S("abcde"), "abcdeabcde", 5, 1, S::npos);
144     test(S("abcde"), "abcdeabcde", 5, 5, S::npos);
145     test(S("abcde"), "abcdeabcde", 5, 9, S::npos);
146     test(S("abcde"), "abcdeabcde", 5, 10, S::npos);
147     test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
148     test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 1, S::npos);
149     test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
150     test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
151     test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
152     test(S("abcde"), "", 6, 0, S::npos);
153     test(S("abcde"), "abcde", 6, 0, S::npos);
154     test(S("abcde"), "abcde", 6, 1, S::npos);
155     test(S("abcde"), "abcde", 6, 2, S::npos);
156     test(S("abcde"), "abcde", 6, 4, S::npos);
157     test(S("abcde"), "abcde", 6, 5, S::npos);
158     test(S("abcde"), "abcdeabcde", 6, 0, S::npos);
159     test(S("abcde"), "abcdeabcde", 6, 1, S::npos);
160     test(S("abcde"), "abcdeabcde", 6, 5, S::npos);
161     test(S("abcde"), "abcdeabcde", 6, 9, S::npos);
162     test(S("abcde"), "abcdeabcde", 6, 10, S::npos);
163     test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 0, S::npos);
164     test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 1, S::npos);
165     test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 10, S::npos);
166     test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 19, S::npos);
167     test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 20, S::npos);
168     test(S("abcdeabcde"), "", 0, 0, 0);
169     test(S("abcdeabcde"), "abcde", 0, 0, 0);
170     test(S("abcdeabcde"), "abcde", 0, 1, 0);
171     test(S("abcdeabcde"), "abcde", 0, 2, 0);
172     test(S("abcdeabcde"), "abcde", 0, 4, 0);
173     test(S("abcdeabcde"), "abcde", 0, 5, 0);
174     test(S("abcdeabcde"), "abcdeabcde", 0, 0, 0);
175     test(S("abcdeabcde"), "abcdeabcde", 0, 1, 0);
176     test(S("abcdeabcde"), "abcdeabcde", 0, 5, 0);
177     test(S("abcdeabcde"), "abcdeabcde", 0, 9, 0);
178     test(S("abcdeabcde"), "abcdeabcde", 0, 10, 0);
179     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
180     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
181     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
182     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
183     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
184     test(S("abcdeabcde"), "", 1, 0, 1);
185     test(S("abcdeabcde"), "abcde", 1, 0, 1);
186     test(S("abcdeabcde"), "abcde", 1, 1, 5);
187     test(S("abcdeabcde"), "abcde", 1, 2, 5);
188     test(S("abcdeabcde"), "abcde", 1, 4, 5);
189     test(S("abcdeabcde"), "abcde", 1, 5, 5);
190     test(S("abcdeabcde"), "abcdeabcde", 1, 0, 1);
191     test(S("abcdeabcde"), "abcdeabcde", 1, 1, 5);
192     test(S("abcdeabcde"), "abcdeabcde", 1, 5, 5);
193     test(S("abcdeabcde"), "abcdeabcde", 1, 9, S::npos);
194     test(S("abcdeabcde"), "abcdeabcde", 1, 10, S::npos);
195     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
196     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
197     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
198     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
199     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
200     test(S("abcdeabcde"), "", 5, 0, 5);
201     test(S("abcdeabcde"), "abcde", 5, 0, 5);
202     test(S("abcdeabcde"), "abcde", 5, 1, 5);
203     test(S("abcdeabcde"), "abcde", 5, 2, 5);
204     test(S("abcdeabcde"), "abcde", 5, 4, 5);
205     test(S("abcdeabcde"), "abcde", 5, 5, 5);
206     test(S("abcdeabcde"), "abcdeabcde", 5, 0, 5);
207     test(S("abcdeabcde"), "abcdeabcde", 5, 1, 5);
208     test(S("abcdeabcde"), "abcdeabcde", 5, 5, 5);
209     test(S("abcdeabcde"), "abcdeabcde", 5, 9, S::npos);
210     test(S("abcdeabcde"), "abcdeabcde", 5, 10, S::npos);
211     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
212     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 1, 5);
213     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
214     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
215     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
216     test(S("abcdeabcde"), "", 9, 0, 9);
217     test(S("abcdeabcde"), "abcde", 9, 0, 9);
218     test(S("abcdeabcde"), "abcde", 9, 1, S::npos);
219     test(S("abcdeabcde"), "abcde", 9, 2, S::npos);
220     test(S("abcdeabcde"), "abcde", 9, 4, S::npos);
221     test(S("abcdeabcde"), "abcde", 9, 5, S::npos);
222     test(S("abcdeabcde"), "abcdeabcde", 9, 0, 9);
223     test(S("abcdeabcde"), "abcdeabcde", 9, 1, S::npos);
224     test(S("abcdeabcde"), "abcdeabcde", 9, 5, S::npos);
225     test(S("abcdeabcde"), "abcdeabcde", 9, 9, S::npos);
226     test(S("abcdeabcde"), "abcdeabcde", 9, 10, S::npos);
227     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 0, 9);
228     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 1, S::npos);
229     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 10, S::npos);
230     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 19, S::npos);
231     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 20, S::npos);
232     test(S("abcdeabcde"), "", 10, 0, 10);
233     test(S("abcdeabcde"), "abcde", 10, 0, 10);
234     test(S("abcdeabcde"), "abcde", 10, 1, S::npos);
235     test(S("abcdeabcde"), "abcde", 10, 2, S::npos);
236     test(S("abcdeabcde"), "abcde", 10, 4, S::npos);
237     test(S("abcdeabcde"), "abcde", 10, 5, S::npos);
238     test(S("abcdeabcde"), "abcdeabcde", 10, 0, 10);
239     test(S("abcdeabcde"), "abcdeabcde", 10, 1, S::npos);
240 }
241 
242 template <class S>
test2()243 void test2()
244 {
245     test(S("abcdeabcde"), "abcdeabcde", 10, 5, S::npos);
246     test(S("abcdeabcde"), "abcdeabcde", 10, 9, S::npos);
247     test(S("abcdeabcde"), "abcdeabcde", 10, 10, S::npos);
248     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
249     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, S::npos);
250     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, S::npos);
251     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
252     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
253     test(S("abcdeabcde"), "", 11, 0, S::npos);
254     test(S("abcdeabcde"), "abcde", 11, 0, S::npos);
255     test(S("abcdeabcde"), "abcde", 11, 1, S::npos);
256     test(S("abcdeabcde"), "abcde", 11, 2, S::npos);
257     test(S("abcdeabcde"), "abcde", 11, 4, S::npos);
258     test(S("abcdeabcde"), "abcde", 11, 5, S::npos);
259     test(S("abcdeabcde"), "abcdeabcde", 11, 0, S::npos);
260     test(S("abcdeabcde"), "abcdeabcde", 11, 1, S::npos);
261     test(S("abcdeabcde"), "abcdeabcde", 11, 5, S::npos);
262     test(S("abcdeabcde"), "abcdeabcde", 11, 9, S::npos);
263     test(S("abcdeabcde"), "abcdeabcde", 11, 10, S::npos);
264     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 0, S::npos);
265     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 1, S::npos);
266     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 10, S::npos);
267     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 19, S::npos);
268     test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 20, S::npos);
269     test(S("abcdeabcdeabcdeabcde"), "", 0, 0, 0);
270     test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0, 0);
271     test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 1, 0);
272     test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 2, 0);
273     test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 4, 0);
274     test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 5, 0);
275     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0, 0);
276     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 1, 0);
277     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 5, 0);
278     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 9, 0);
279     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 10, 0);
280     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
281     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
282     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
283     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, 0);
284     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, 0);
285     test(S("abcdeabcdeabcdeabcde"), "", 1, 0, 1);
286     test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0, 1);
287     test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 1, 5);
288     test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 2, 5);
289     test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 4, 5);
290     test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5, 5);
291     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0, 1);
292     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 1, 5);
293     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5, 5);
294     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 9, 5);
295     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 10, 5);
296     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
297     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
298     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 5);
299     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
300     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
301     test(S("abcdeabcdeabcdeabcde"), "", 10, 0, 10);
302     test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 0, 10);
303     test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 1, 10);
304     test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 2, 10);
305     test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 4, 10);
306     test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 5, 10);
307     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 0, 10);
308     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 1, 10);
309     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 5, 10);
310     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 9, 10);
311     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10, 10);
312     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
313     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 10);
314     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 10);
315     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
316     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
317     test(S("abcdeabcdeabcdeabcde"), "", 19, 0, 19);
318     test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 0, 19);
319     test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 1, S::npos);
320     test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 2, S::npos);
321     test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 4, S::npos);
322     test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 5, S::npos);
323     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 0, 19);
324     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 1, S::npos);
325     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 5, S::npos);
326     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 9, S::npos);
327     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10, S::npos);
328     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0, 19);
329     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 1, S::npos);
330     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 10, S::npos);
331     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 19, S::npos);
332     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 20, S::npos);
333     test(S("abcdeabcdeabcdeabcde"), "", 20, 0, 20);
334     test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 0, 20);
335     test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 1, S::npos);
336     test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 2, S::npos);
337     test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 4, S::npos);
338     test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 5, S::npos);
339     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 0, 20);
340     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 1, S::npos);
341     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 5, S::npos);
342     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 9, S::npos);
343     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10, S::npos);
344     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0, 20);
345 }
346 
347 template <class S>
test3()348 void test3()
349 {
350     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 1, S::npos);
351     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 10, S::npos);
352     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 19, S::npos);
353     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 20, S::npos);
354     test(S("abcdeabcdeabcdeabcde"), "", 21, 0, S::npos);
355     test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 0, S::npos);
356     test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 1, S::npos);
357     test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 2, S::npos);
358     test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 4, S::npos);
359     test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 5, S::npos);
360     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 0, S::npos);
361     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 1, S::npos);
362     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 5, S::npos);
363     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 9, S::npos);
364     test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10, S::npos);
365     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0, S::npos);
366     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 1, S::npos);
367     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 10, S::npos);
368     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 19, S::npos);
369     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, S::npos);
370 }
371 
main(int,char **)372 int main(int, char**)
373 {
374     {
375     typedef std::string_view S;
376     test0<S>();
377     test1<S>();
378     test2<S>();
379     test3<S>();
380     }
381 
382 #if TEST_STD_VER > 11
383     {
384     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
385     constexpr SV  sv1;
386     constexpr SV  sv2 { "abcde", 5 };
387 
388     static_assert (sv1.find( "",      0, 0 ) == 0, "" );
389     static_assert (sv1.find( "abcde", 0, 0 ) == 0, "" );
390     static_assert (sv1.find( "abcde", 0, 1 ) == SV::npos, "" );
391     static_assert (sv2.find( "",      0, 0 ) == 0, "" );
392     static_assert (sv2.find( "abcde", 0, 0 ) == 0, "" );
393     static_assert (sv2.find( "abcde", 0, 1 ) == 0, "" );
394     }
395 #endif
396 
397   return 0;
398 }
399