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 // <string>
10 
11 // template<class InputIterator>
12 //   basic_string&
13 //   replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2); // constexpr since C++20
14 
15 #include <string>
16 #include <iterator>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "min_allocator.h"
21 #include "test_iterators.h"
22 
23 template <class S, class It>
24 TEST_CONSTEXPR_CXX20 void
test(S s,typename S::size_type pos1,typename S::size_type n1,It f,It l,S expected)25 test(S s, typename S::size_type pos1, typename S::size_type n1, It f, It l, S expected)
26 {
27     typename S::size_type old_size = s.size();
28     typename S::const_iterator first = s.begin() + pos1;
29     typename S::const_iterator last = s.begin() + pos1 + n1;
30     typename S::size_type xlen = last - first;
31     s.replace(first, last, f, l);
32     LIBCPP_ASSERT(s.__invariants());
33     assert(s == expected);
34     typename S::size_type rlen = std::distance(f, l);
35     assert(s.size() == old_size - xlen + rlen);
36 }
37 
38 #ifndef TEST_HAS_NO_EXCEPTIONS
operator charWidget39 struct Widget { operator char() const { throw 42; } };
40 
41 template <class S, class It>
42 TEST_CONSTEXPR_CXX20 void
test_exceptions(S s,typename S::size_type pos1,typename S::size_type n1,It f,It l)43 test_exceptions(S s, typename S::size_type pos1, typename S::size_type n1, It f, It l)
44 {
45     typename S::const_iterator first = s.begin() + pos1;
46     typename S::const_iterator last = s.begin() + pos1 + n1;
47 
48     S original = s;
49     typename S::iterator begin = s.begin();
50     typename S::iterator end = s.end();
51 
52     try {
53         s.replace(first, last, f, l);
54         assert(false);
55     } catch (...) {}
56 
57     // Part of "no effects" is that iterators and pointers
58     // into the string must not have been invalidated.
59     LIBCPP_ASSERT(s.__invariants());
60     assert(s == original);
61     assert(s.begin() == begin);
62     assert(s.end() == end);
63 }
64 #endif
65 
66 TEST_CONSTEXPR const char* str = "12345678901234567890";
67 
68 template <class S>
test0()69 TEST_CONSTEXPR_CXX20 bool test0()
70 {
71     test(S(""), 0, 0, str, str+0, S(""));
72     test(S(""), 0, 0, str, str+0, S(""));
73     test(S(""), 0, 0, str, str+1, S("1"));
74     test(S(""), 0, 0, str, str+2, S("12"));
75     test(S(""), 0, 0, str, str+4, S("1234"));
76     test(S(""), 0, 0, str, str+5, S("12345"));
77     test(S(""), 0, 0, str, str+0, S(""));
78     test(S(""), 0, 0, str, str+1, S("1"));
79     test(S(""), 0, 0, str, str+5, S("12345"));
80     test(S(""), 0, 0, str, str+9, S("123456789"));
81     test(S(""), 0, 0, str, str+10, S("1234567890"));
82     test(S(""), 0, 0, str, str+0, S(""));
83     test(S(""), 0, 0, str, str+1, S("1"));
84     test(S(""), 0, 0, str, str+10, S("1234567890"));
85     test(S(""), 0, 0, str, str+19, S("1234567890123456789"));
86     test(S(""), 0, 0, str, str+20, S("12345678901234567890"));
87     test(S("abcde"), 0, 0, str, str+0, S("abcde"));
88     test(S("abcde"), 0, 0, str, str+0, S("abcde"));
89     test(S("abcde"), 0, 0, str, str+1, S("1abcde"));
90     test(S("abcde"), 0, 0, str, str+2, S("12abcde"));
91     test(S("abcde"), 0, 0, str, str+4, S("1234abcde"));
92     test(S("abcde"), 0, 0, str, str+5, S("12345abcde"));
93     test(S("abcde"), 0, 0, str, str+0, S("abcde"));
94     test(S("abcde"), 0, 0, str, str+1, S("1abcde"));
95     test(S("abcde"), 0, 0, str, str+5, S("12345abcde"));
96     test(S("abcde"), 0, 0, str, str+9, S("123456789abcde"));
97     test(S("abcde"), 0, 0, str, str+10, S("1234567890abcde"));
98     test(S("abcde"), 0, 0, str, str+0, S("abcde"));
99     test(S("abcde"), 0, 0, str, str+1, S("1abcde"));
100     test(S("abcde"), 0, 0, str, str+10, S("1234567890abcde"));
101     test(S("abcde"), 0, 0, str, str+19, S("1234567890123456789abcde"));
102     test(S("abcde"), 0, 0, str, str+20, S("12345678901234567890abcde"));
103     test(S("abcde"), 0, 1, str, str+0, S("bcde"));
104     test(S("abcde"), 0, 1, str, str+0, S("bcde"));
105     test(S("abcde"), 0, 1, str, str+1, S("1bcde"));
106     test(S("abcde"), 0, 1, str, str+2, S("12bcde"));
107     test(S("abcde"), 0, 1, str, str+4, S("1234bcde"));
108     test(S("abcde"), 0, 1, str, str+5, S("12345bcde"));
109     test(S("abcde"), 0, 1, str, str+0, S("bcde"));
110     test(S("abcde"), 0, 1, str, str+1, S("1bcde"));
111     test(S("abcde"), 0, 1, str, str+5, S("12345bcde"));
112     test(S("abcde"), 0, 1, str, str+9, S("123456789bcde"));
113     test(S("abcde"), 0, 1, str, str+10, S("1234567890bcde"));
114     test(S("abcde"), 0, 1, str, str+0, S("bcde"));
115     test(S("abcde"), 0, 1, str, str+1, S("1bcde"));
116     test(S("abcde"), 0, 1, str, str+10, S("1234567890bcde"));
117     test(S("abcde"), 0, 1, str, str+19, S("1234567890123456789bcde"));
118     test(S("abcde"), 0, 1, str, str+20, S("12345678901234567890bcde"));
119     test(S("abcde"), 0, 2, str, str+0, S("cde"));
120     test(S("abcde"), 0, 2, str, str+0, S("cde"));
121     test(S("abcde"), 0, 2, str, str+1, S("1cde"));
122     test(S("abcde"), 0, 2, str, str+2, S("12cde"));
123     test(S("abcde"), 0, 2, str, str+4, S("1234cde"));
124     test(S("abcde"), 0, 2, str, str+5, S("12345cde"));
125     test(S("abcde"), 0, 2, str, str+0, S("cde"));
126     test(S("abcde"), 0, 2, str, str+1, S("1cde"));
127     test(S("abcde"), 0, 2, str, str+5, S("12345cde"));
128     test(S("abcde"), 0, 2, str, str+9, S("123456789cde"));
129     test(S("abcde"), 0, 2, str, str+10, S("1234567890cde"));
130     test(S("abcde"), 0, 2, str, str+0, S("cde"));
131     test(S("abcde"), 0, 2, str, str+1, S("1cde"));
132     test(S("abcde"), 0, 2, str, str+10, S("1234567890cde"));
133     test(S("abcde"), 0, 2, str, str+19, S("1234567890123456789cde"));
134     test(S("abcde"), 0, 2, str, str+20, S("12345678901234567890cde"));
135     test(S("abcde"), 0, 4, str, str+0, S("e"));
136     test(S("abcde"), 0, 4, str, str+0, S("e"));
137     test(S("abcde"), 0, 4, str, str+1, S("1e"));
138     test(S("abcde"), 0, 4, str, str+2, S("12e"));
139     test(S("abcde"), 0, 4, str, str+4, S("1234e"));
140     test(S("abcde"), 0, 4, str, str+5, S("12345e"));
141     test(S("abcde"), 0, 4, str, str+0, S("e"));
142     test(S("abcde"), 0, 4, str, str+1, S("1e"));
143     test(S("abcde"), 0, 4, str, str+5, S("12345e"));
144     test(S("abcde"), 0, 4, str, str+9, S("123456789e"));
145     test(S("abcde"), 0, 4, str, str+10, S("1234567890e"));
146     test(S("abcde"), 0, 4, str, str+0, S("e"));
147     test(S("abcde"), 0, 4, str, str+1, S("1e"));
148     test(S("abcde"), 0, 4, str, str+10, S("1234567890e"));
149     test(S("abcde"), 0, 4, str, str+19, S("1234567890123456789e"));
150     test(S("abcde"), 0, 4, str, str+20, S("12345678901234567890e"));
151     test(S("abcde"), 0, 5, str, str+0, S(""));
152     test(S("abcde"), 0, 5, str, str+0, S(""));
153     test(S("abcde"), 0, 5, str, str+1, S("1"));
154     test(S("abcde"), 0, 5, str, str+2, S("12"));
155     test(S("abcde"), 0, 5, str, str+4, S("1234"));
156     test(S("abcde"), 0, 5, str, str+5, S("12345"));
157     test(S("abcde"), 0, 5, str, str+0, S(""));
158     test(S("abcde"), 0, 5, str, str+1, S("1"));
159     test(S("abcde"), 0, 5, str, str+5, S("12345"));
160     test(S("abcde"), 0, 5, str, str+9, S("123456789"));
161     test(S("abcde"), 0, 5, str, str+10, S("1234567890"));
162     test(S("abcde"), 0, 5, str, str+0, S(""));
163     test(S("abcde"), 0, 5, str, str+1, S("1"));
164     test(S("abcde"), 0, 5, str, str+10, S("1234567890"));
165     test(S("abcde"), 0, 5, str, str+19, S("1234567890123456789"));
166     test(S("abcde"), 0, 5, str, str+20, S("12345678901234567890"));
167     test(S("abcde"), 1, 0, str, str+0, S("abcde"));
168     test(S("abcde"), 1, 0, str, str+0, S("abcde"));
169     test(S("abcde"), 1, 0, str, str+1, S("a1bcde"));
170     test(S("abcde"), 1, 0, str, str+2, S("a12bcde"));
171 
172     return true;
173 }
174 
175 template <class S>
test1()176 TEST_CONSTEXPR_CXX20 bool test1()
177 {
178     test(S("abcde"), 1, 0, str, str+4, S("a1234bcde"));
179     test(S("abcde"), 1, 0, str, str+5, S("a12345bcde"));
180     test(S("abcde"), 1, 0, str, str+0, S("abcde"));
181     test(S("abcde"), 1, 0, str, str+1, S("a1bcde"));
182     test(S("abcde"), 1, 0, str, str+5, S("a12345bcde"));
183     test(S("abcde"), 1, 0, str, str+9, S("a123456789bcde"));
184     test(S("abcde"), 1, 0, str, str+10, S("a1234567890bcde"));
185     test(S("abcde"), 1, 0, str, str+0, S("abcde"));
186     test(S("abcde"), 1, 0, str, str+1, S("a1bcde"));
187     test(S("abcde"), 1, 0, str, str+10, S("a1234567890bcde"));
188     test(S("abcde"), 1, 0, str, str+19, S("a1234567890123456789bcde"));
189     test(S("abcde"), 1, 0, str, str+20, S("a12345678901234567890bcde"));
190     test(S("abcde"), 1, 1, str, str+0, S("acde"));
191     test(S("abcde"), 1, 1, str, str+0, S("acde"));
192     test(S("abcde"), 1, 1, str, str+1, S("a1cde"));
193     test(S("abcde"), 1, 1, str, str+2, S("a12cde"));
194     test(S("abcde"), 1, 1, str, str+4, S("a1234cde"));
195     test(S("abcde"), 1, 1, str, str+5, S("a12345cde"));
196     test(S("abcde"), 1, 1, str, str+0, S("acde"));
197     test(S("abcde"), 1, 1, str, str+1, S("a1cde"));
198     test(S("abcde"), 1, 1, str, str+5, S("a12345cde"));
199     test(S("abcde"), 1, 1, str, str+9, S("a123456789cde"));
200     test(S("abcde"), 1, 1, str, str+10, S("a1234567890cde"));
201     test(S("abcde"), 1, 1, str, str+0, S("acde"));
202     test(S("abcde"), 1, 1, str, str+1, S("a1cde"));
203     test(S("abcde"), 1, 1, str, str+10, S("a1234567890cde"));
204     test(S("abcde"), 1, 1, str, str+19, S("a1234567890123456789cde"));
205     test(S("abcde"), 1, 1, str, str+20, S("a12345678901234567890cde"));
206     test(S("abcde"), 1, 2, str, str+0, S("ade"));
207     test(S("abcde"), 1, 2, str, str+0, S("ade"));
208     test(S("abcde"), 1, 2, str, str+1, S("a1de"));
209     test(S("abcde"), 1, 2, str, str+2, S("a12de"));
210     test(S("abcde"), 1, 2, str, str+4, S("a1234de"));
211     test(S("abcde"), 1, 2, str, str+5, S("a12345de"));
212     test(S("abcde"), 1, 2, str, str+0, S("ade"));
213     test(S("abcde"), 1, 2, str, str+1, S("a1de"));
214     test(S("abcde"), 1, 2, str, str+5, S("a12345de"));
215     test(S("abcde"), 1, 2, str, str+9, S("a123456789de"));
216     test(S("abcde"), 1, 2, str, str+10, S("a1234567890de"));
217     test(S("abcde"), 1, 2, str, str+0, S("ade"));
218     test(S("abcde"), 1, 2, str, str+1, S("a1de"));
219     test(S("abcde"), 1, 2, str, str+10, S("a1234567890de"));
220     test(S("abcde"), 1, 2, str, str+19, S("a1234567890123456789de"));
221     test(S("abcde"), 1, 2, str, str+20, S("a12345678901234567890de"));
222     test(S("abcde"), 1, 3, str, str+0, S("ae"));
223     test(S("abcde"), 1, 3, str, str+0, S("ae"));
224     test(S("abcde"), 1, 3, str, str+1, S("a1e"));
225     test(S("abcde"), 1, 3, str, str+2, S("a12e"));
226     test(S("abcde"), 1, 3, str, str+4, S("a1234e"));
227     test(S("abcde"), 1, 3, str, str+5, S("a12345e"));
228     test(S("abcde"), 1, 3, str, str+0, S("ae"));
229     test(S("abcde"), 1, 3, str, str+1, S("a1e"));
230     test(S("abcde"), 1, 3, str, str+5, S("a12345e"));
231     test(S("abcde"), 1, 3, str, str+9, S("a123456789e"));
232     test(S("abcde"), 1, 3, str, str+10, S("a1234567890e"));
233     test(S("abcde"), 1, 3, str, str+0, S("ae"));
234     test(S("abcde"), 1, 3, str, str+1, S("a1e"));
235     test(S("abcde"), 1, 3, str, str+10, S("a1234567890e"));
236     test(S("abcde"), 1, 3, str, str+19, S("a1234567890123456789e"));
237     test(S("abcde"), 1, 3, str, str+20, S("a12345678901234567890e"));
238     test(S("abcde"), 1, 4, str, str+0, S("a"));
239     test(S("abcde"), 1, 4, str, str+0, S("a"));
240     test(S("abcde"), 1, 4, str, str+1, S("a1"));
241     test(S("abcde"), 1, 4, str, str+2, S("a12"));
242     test(S("abcde"), 1, 4, str, str+4, S("a1234"));
243     test(S("abcde"), 1, 4, str, str+5, S("a12345"));
244     test(S("abcde"), 1, 4, str, str+0, S("a"));
245     test(S("abcde"), 1, 4, str, str+1, S("a1"));
246     test(S("abcde"), 1, 4, str, str+5, S("a12345"));
247     test(S("abcde"), 1, 4, str, str+9, S("a123456789"));
248     test(S("abcde"), 1, 4, str, str+10, S("a1234567890"));
249     test(S("abcde"), 1, 4, str, str+0, S("a"));
250     test(S("abcde"), 1, 4, str, str+1, S("a1"));
251     test(S("abcde"), 1, 4, str, str+10, S("a1234567890"));
252     test(S("abcde"), 1, 4, str, str+19, S("a1234567890123456789"));
253     test(S("abcde"), 1, 4, str, str+20, S("a12345678901234567890"));
254     test(S("abcde"), 2, 0, str, str+0, S("abcde"));
255     test(S("abcde"), 2, 0, str, str+0, S("abcde"));
256     test(S("abcde"), 2, 0, str, str+1, S("ab1cde"));
257     test(S("abcde"), 2, 0, str, str+2, S("ab12cde"));
258     test(S("abcde"), 2, 0, str, str+4, S("ab1234cde"));
259     test(S("abcde"), 2, 0, str, str+5, S("ab12345cde"));
260     test(S("abcde"), 2, 0, str, str+0, S("abcde"));
261     test(S("abcde"), 2, 0, str, str+1, S("ab1cde"));
262     test(S("abcde"), 2, 0, str, str+5, S("ab12345cde"));
263     test(S("abcde"), 2, 0, str, str+9, S("ab123456789cde"));
264     test(S("abcde"), 2, 0, str, str+10, S("ab1234567890cde"));
265     test(S("abcde"), 2, 0, str, str+0, S("abcde"));
266     test(S("abcde"), 2, 0, str, str+1, S("ab1cde"));
267     test(S("abcde"), 2, 0, str, str+10, S("ab1234567890cde"));
268     test(S("abcde"), 2, 0, str, str+19, S("ab1234567890123456789cde"));
269     test(S("abcde"), 2, 0, str, str+20, S("ab12345678901234567890cde"));
270     test(S("abcde"), 2, 1, str, str+0, S("abde"));
271     test(S("abcde"), 2, 1, str, str+0, S("abde"));
272     test(S("abcde"), 2, 1, str, str+1, S("ab1de"));
273     test(S("abcde"), 2, 1, str, str+2, S("ab12de"));
274     test(S("abcde"), 2, 1, str, str+4, S("ab1234de"));
275     test(S("abcde"), 2, 1, str, str+5, S("ab12345de"));
276     test(S("abcde"), 2, 1, str, str+0, S("abde"));
277     test(S("abcde"), 2, 1, str, str+1, S("ab1de"));
278 
279     return true;
280 }
281 
282 template <class S>
test2()283 TEST_CONSTEXPR_CXX20 bool test2()
284 {
285     test(S("abcde"), 2, 1, str, str+5, S("ab12345de"));
286     test(S("abcde"), 2, 1, str, str+9, S("ab123456789de"));
287     test(S("abcde"), 2, 1, str, str+10, S("ab1234567890de"));
288     test(S("abcde"), 2, 1, str, str+0, S("abde"));
289     test(S("abcde"), 2, 1, str, str+1, S("ab1de"));
290     test(S("abcde"), 2, 1, str, str+10, S("ab1234567890de"));
291     test(S("abcde"), 2, 1, str, str+19, S("ab1234567890123456789de"));
292     test(S("abcde"), 2, 1, str, str+20, S("ab12345678901234567890de"));
293     test(S("abcde"), 2, 2, str, str+0, S("abe"));
294     test(S("abcde"), 2, 2, str, str+0, S("abe"));
295     test(S("abcde"), 2, 2, str, str+1, S("ab1e"));
296     test(S("abcde"), 2, 2, str, str+2, S("ab12e"));
297     test(S("abcde"), 2, 2, str, str+4, S("ab1234e"));
298     test(S("abcde"), 2, 2, str, str+5, S("ab12345e"));
299     test(S("abcde"), 2, 2, str, str+0, S("abe"));
300     test(S("abcde"), 2, 2, str, str+1, S("ab1e"));
301     test(S("abcde"), 2, 2, str, str+5, S("ab12345e"));
302     test(S("abcde"), 2, 2, str, str+9, S("ab123456789e"));
303     test(S("abcde"), 2, 2, str, str+10, S("ab1234567890e"));
304     test(S("abcde"), 2, 2, str, str+0, S("abe"));
305     test(S("abcde"), 2, 2, str, str+1, S("ab1e"));
306     test(S("abcde"), 2, 2, str, str+10, S("ab1234567890e"));
307     test(S("abcde"), 2, 2, str, str+19, S("ab1234567890123456789e"));
308     test(S("abcde"), 2, 2, str, str+20, S("ab12345678901234567890e"));
309     test(S("abcde"), 2, 3, str, str+0, S("ab"));
310     test(S("abcde"), 2, 3, str, str+0, S("ab"));
311     test(S("abcde"), 2, 3, str, str+1, S("ab1"));
312     test(S("abcde"), 2, 3, str, str+2, S("ab12"));
313     test(S("abcde"), 2, 3, str, str+4, S("ab1234"));
314     test(S("abcde"), 2, 3, str, str+5, S("ab12345"));
315     test(S("abcde"), 2, 3, str, str+0, S("ab"));
316     test(S("abcde"), 2, 3, str, str+1, S("ab1"));
317     test(S("abcde"), 2, 3, str, str+5, S("ab12345"));
318     test(S("abcde"), 2, 3, str, str+9, S("ab123456789"));
319     test(S("abcde"), 2, 3, str, str+10, S("ab1234567890"));
320     test(S("abcde"), 2, 3, str, str+0, S("ab"));
321     test(S("abcde"), 2, 3, str, str+1, S("ab1"));
322     test(S("abcde"), 2, 3, str, str+10, S("ab1234567890"));
323     test(S("abcde"), 2, 3, str, str+19, S("ab1234567890123456789"));
324     test(S("abcde"), 2, 3, str, str+20, S("ab12345678901234567890"));
325     test(S("abcde"), 4, 0, str, str+0, S("abcde"));
326     test(S("abcde"), 4, 0, str, str+0, S("abcde"));
327     test(S("abcde"), 4, 0, str, str+1, S("abcd1e"));
328     test(S("abcde"), 4, 0, str, str+2, S("abcd12e"));
329     test(S("abcde"), 4, 0, str, str+4, S("abcd1234e"));
330     test(S("abcde"), 4, 0, str, str+5, S("abcd12345e"));
331     test(S("abcde"), 4, 0, str, str+0, S("abcde"));
332     test(S("abcde"), 4, 0, str, str+1, S("abcd1e"));
333     test(S("abcde"), 4, 0, str, str+5, S("abcd12345e"));
334     test(S("abcde"), 4, 0, str, str+9, S("abcd123456789e"));
335     test(S("abcde"), 4, 0, str, str+10, S("abcd1234567890e"));
336     test(S("abcde"), 4, 0, str, str+0, S("abcde"));
337     test(S("abcde"), 4, 0, str, str+1, S("abcd1e"));
338     test(S("abcde"), 4, 0, str, str+10, S("abcd1234567890e"));
339     test(S("abcde"), 4, 0, str, str+19, S("abcd1234567890123456789e"));
340     test(S("abcde"), 4, 0, str, str+20, S("abcd12345678901234567890e"));
341     test(S("abcde"), 4, 1, str, str+0, S("abcd"));
342     test(S("abcde"), 4, 1, str, str+0, S("abcd"));
343     test(S("abcde"), 4, 1, str, str+1, S("abcd1"));
344     test(S("abcde"), 4, 1, str, str+2, S("abcd12"));
345     test(S("abcde"), 4, 1, str, str+4, S("abcd1234"));
346     test(S("abcde"), 4, 1, str, str+5, S("abcd12345"));
347     test(S("abcde"), 4, 1, str, str+0, S("abcd"));
348     test(S("abcde"), 4, 1, str, str+1, S("abcd1"));
349     test(S("abcde"), 4, 1, str, str+5, S("abcd12345"));
350     test(S("abcde"), 4, 1, str, str+9, S("abcd123456789"));
351     test(S("abcde"), 4, 1, str, str+10, S("abcd1234567890"));
352     test(S("abcde"), 4, 1, str, str+0, S("abcd"));
353     test(S("abcde"), 4, 1, str, str+1, S("abcd1"));
354     test(S("abcde"), 4, 1, str, str+10, S("abcd1234567890"));
355     test(S("abcde"), 4, 1, str, str+19, S("abcd1234567890123456789"));
356     test(S("abcde"), 4, 1, str, str+20, S("abcd12345678901234567890"));
357     test(S("abcde"), 5, 0, str, str+0, S("abcde"));
358     test(S("abcde"), 5, 0, str, str+0, S("abcde"));
359     test(S("abcde"), 5, 0, str, str+1, S("abcde1"));
360     test(S("abcde"), 5, 0, str, str+2, S("abcde12"));
361     test(S("abcde"), 5, 0, str, str+4, S("abcde1234"));
362     test(S("abcde"), 5, 0, str, str+5, S("abcde12345"));
363     test(S("abcde"), 5, 0, str, str+0, S("abcde"));
364     test(S("abcde"), 5, 0, str, str+1, S("abcde1"));
365     test(S("abcde"), 5, 0, str, str+5, S("abcde12345"));
366     test(S("abcde"), 5, 0, str, str+9, S("abcde123456789"));
367     test(S("abcde"), 5, 0, str, str+10, S("abcde1234567890"));
368     test(S("abcde"), 5, 0, str, str+0, S("abcde"));
369     test(S("abcde"), 5, 0, str, str+1, S("abcde1"));
370     test(S("abcde"), 5, 0, str, str+10, S("abcde1234567890"));
371     test(S("abcde"), 5, 0, str, str+19, S("abcde1234567890123456789"));
372     test(S("abcde"), 5, 0, str, str+20, S("abcde12345678901234567890"));
373     test(S("abcdefghij"), 0, 0, str, str+0, S("abcdefghij"));
374     test(S("abcdefghij"), 0, 0, str, str+0, S("abcdefghij"));
375     test(S("abcdefghij"), 0, 0, str, str+1, S("1abcdefghij"));
376     test(S("abcdefghij"), 0, 0, str, str+2, S("12abcdefghij"));
377     test(S("abcdefghij"), 0, 0, str, str+4, S("1234abcdefghij"));
378     test(S("abcdefghij"), 0, 0, str, str+5, S("12345abcdefghij"));
379     test(S("abcdefghij"), 0, 0, str, str+0, S("abcdefghij"));
380     test(S("abcdefghij"), 0, 0, str, str+1, S("1abcdefghij"));
381     test(S("abcdefghij"), 0, 0, str, str+5, S("12345abcdefghij"));
382     test(S("abcdefghij"), 0, 0, str, str+9, S("123456789abcdefghij"));
383     test(S("abcdefghij"), 0, 0, str, str+10, S("1234567890abcdefghij"));
384     test(S("abcdefghij"), 0, 0, str, str+0, S("abcdefghij"));
385 
386     return true;
387 }
388 
389 template <class S>
test3()390 TEST_CONSTEXPR_CXX20 bool test3()
391 {
392     test(S("abcdefghij"), 0, 0, str, str+1, S("1abcdefghij"));
393     test(S("abcdefghij"), 0, 0, str, str+10, S("1234567890abcdefghij"));
394     test(S("abcdefghij"), 0, 0, str, str+19, S("1234567890123456789abcdefghij"));
395     test(S("abcdefghij"), 0, 0, str, str+20, S("12345678901234567890abcdefghij"));
396     test(S("abcdefghij"), 0, 1, str, str+0, S("bcdefghij"));
397     test(S("abcdefghij"), 0, 1, str, str+0, S("bcdefghij"));
398     test(S("abcdefghij"), 0, 1, str, str+1, S("1bcdefghij"));
399     test(S("abcdefghij"), 0, 1, str, str+2, S("12bcdefghij"));
400     test(S("abcdefghij"), 0, 1, str, str+4, S("1234bcdefghij"));
401     test(S("abcdefghij"), 0, 1, str, str+5, S("12345bcdefghij"));
402     test(S("abcdefghij"), 0, 1, str, str+0, S("bcdefghij"));
403     test(S("abcdefghij"), 0, 1, str, str+1, S("1bcdefghij"));
404     test(S("abcdefghij"), 0, 1, str, str+5, S("12345bcdefghij"));
405     test(S("abcdefghij"), 0, 1, str, str+9, S("123456789bcdefghij"));
406     test(S("abcdefghij"), 0, 1, str, str+10, S("1234567890bcdefghij"));
407     test(S("abcdefghij"), 0, 1, str, str+0, S("bcdefghij"));
408     test(S("abcdefghij"), 0, 1, str, str+1, S("1bcdefghij"));
409     test(S("abcdefghij"), 0, 1, str, str+10, S("1234567890bcdefghij"));
410     test(S("abcdefghij"), 0, 1, str, str+19, S("1234567890123456789bcdefghij"));
411     test(S("abcdefghij"), 0, 1, str, str+20, S("12345678901234567890bcdefghij"));
412     test(S("abcdefghij"), 0, 5, str, str+0, S("fghij"));
413     test(S("abcdefghij"), 0, 5, str, str+0, S("fghij"));
414     test(S("abcdefghij"), 0, 5, str, str+1, S("1fghij"));
415     test(S("abcdefghij"), 0, 5, str, str+2, S("12fghij"));
416     test(S("abcdefghij"), 0, 5, str, str+4, S("1234fghij"));
417     test(S("abcdefghij"), 0, 5, str, str+5, S("12345fghij"));
418     test(S("abcdefghij"), 0, 5, str, str+0, S("fghij"));
419     test(S("abcdefghij"), 0, 5, str, str+1, S("1fghij"));
420     test(S("abcdefghij"), 0, 5, str, str+5, S("12345fghij"));
421     test(S("abcdefghij"), 0, 5, str, str+9, S("123456789fghij"));
422     test(S("abcdefghij"), 0, 5, str, str+10, S("1234567890fghij"));
423     test(S("abcdefghij"), 0, 5, str, str+0, S("fghij"));
424     test(S("abcdefghij"), 0, 5, str, str+1, S("1fghij"));
425     test(S("abcdefghij"), 0, 5, str, str+10, S("1234567890fghij"));
426     test(S("abcdefghij"), 0, 5, str, str+19, S("1234567890123456789fghij"));
427     test(S("abcdefghij"), 0, 5, str, str+20, S("12345678901234567890fghij"));
428     test(S("abcdefghij"), 0, 9, str, str+0, S("j"));
429     test(S("abcdefghij"), 0, 9, str, str+0, S("j"));
430     test(S("abcdefghij"), 0, 9, str, str+1, S("1j"));
431     test(S("abcdefghij"), 0, 9, str, str+2, S("12j"));
432     test(S("abcdefghij"), 0, 9, str, str+4, S("1234j"));
433     test(S("abcdefghij"), 0, 9, str, str+5, S("12345j"));
434     test(S("abcdefghij"), 0, 9, str, str+0, S("j"));
435     test(S("abcdefghij"), 0, 9, str, str+1, S("1j"));
436     test(S("abcdefghij"), 0, 9, str, str+5, S("12345j"));
437     test(S("abcdefghij"), 0, 9, str, str+9, S("123456789j"));
438     test(S("abcdefghij"), 0, 9, str, str+10, S("1234567890j"));
439     test(S("abcdefghij"), 0, 9, str, str+0, S("j"));
440     test(S("abcdefghij"), 0, 9, str, str+1, S("1j"));
441     test(S("abcdefghij"), 0, 9, str, str+10, S("1234567890j"));
442     test(S("abcdefghij"), 0, 9, str, str+19, S("1234567890123456789j"));
443     test(S("abcdefghij"), 0, 9, str, str+20, S("12345678901234567890j"));
444     test(S("abcdefghij"), 0, 10, str, str+0, S(""));
445     test(S("abcdefghij"), 0, 10, str, str+0, S(""));
446     test(S("abcdefghij"), 0, 10, str, str+1, S("1"));
447     test(S("abcdefghij"), 0, 10, str, str+2, S("12"));
448     test(S("abcdefghij"), 0, 10, str, str+4, S("1234"));
449     test(S("abcdefghij"), 0, 10, str, str+5, S("12345"));
450     test(S("abcdefghij"), 0, 10, str, str+0, S(""));
451     test(S("abcdefghij"), 0, 10, str, str+1, S("1"));
452     test(S("abcdefghij"), 0, 10, str, str+5, S("12345"));
453     test(S("abcdefghij"), 0, 10, str, str+9, S("123456789"));
454     test(S("abcdefghij"), 0, 10, str, str+10, S("1234567890"));
455     test(S("abcdefghij"), 0, 10, str, str+0, S(""));
456     test(S("abcdefghij"), 0, 10, str, str+1, S("1"));
457     test(S("abcdefghij"), 0, 10, str, str+10, S("1234567890"));
458     test(S("abcdefghij"), 0, 10, str, str+19, S("1234567890123456789"));
459     test(S("abcdefghij"), 0, 10, str, str+20, S("12345678901234567890"));
460     test(S("abcdefghij"), 1, 0, str, str+0, S("abcdefghij"));
461     test(S("abcdefghij"), 1, 0, str, str+0, S("abcdefghij"));
462     test(S("abcdefghij"), 1, 0, str, str+1, S("a1bcdefghij"));
463     test(S("abcdefghij"), 1, 0, str, str+2, S("a12bcdefghij"));
464     test(S("abcdefghij"), 1, 0, str, str+4, S("a1234bcdefghij"));
465     test(S("abcdefghij"), 1, 0, str, str+5, S("a12345bcdefghij"));
466     test(S("abcdefghij"), 1, 0, str, str+0, S("abcdefghij"));
467     test(S("abcdefghij"), 1, 0, str, str+1, S("a1bcdefghij"));
468     test(S("abcdefghij"), 1, 0, str, str+5, S("a12345bcdefghij"));
469     test(S("abcdefghij"), 1, 0, str, str+9, S("a123456789bcdefghij"));
470     test(S("abcdefghij"), 1, 0, str, str+10, S("a1234567890bcdefghij"));
471     test(S("abcdefghij"), 1, 0, str, str+0, S("abcdefghij"));
472     test(S("abcdefghij"), 1, 0, str, str+1, S("a1bcdefghij"));
473     test(S("abcdefghij"), 1, 0, str, str+10, S("a1234567890bcdefghij"));
474     test(S("abcdefghij"), 1, 0, str, str+19, S("a1234567890123456789bcdefghij"));
475     test(S("abcdefghij"), 1, 0, str, str+20, S("a12345678901234567890bcdefghij"));
476     test(S("abcdefghij"), 1, 1, str, str+0, S("acdefghij"));
477     test(S("abcdefghij"), 1, 1, str, str+0, S("acdefghij"));
478     test(S("abcdefghij"), 1, 1, str, str+1, S("a1cdefghij"));
479     test(S("abcdefghij"), 1, 1, str, str+2, S("a12cdefghij"));
480     test(S("abcdefghij"), 1, 1, str, str+4, S("a1234cdefghij"));
481     test(S("abcdefghij"), 1, 1, str, str+5, S("a12345cdefghij"));
482     test(S("abcdefghij"), 1, 1, str, str+0, S("acdefghij"));
483     test(S("abcdefghij"), 1, 1, str, str+1, S("a1cdefghij"));
484     test(S("abcdefghij"), 1, 1, str, str+5, S("a12345cdefghij"));
485     test(S("abcdefghij"), 1, 1, str, str+9, S("a123456789cdefghij"));
486     test(S("abcdefghij"), 1, 1, str, str+10, S("a1234567890cdefghij"));
487     test(S("abcdefghij"), 1, 1, str, str+0, S("acdefghij"));
488     test(S("abcdefghij"), 1, 1, str, str+1, S("a1cdefghij"));
489     test(S("abcdefghij"), 1, 1, str, str+10, S("a1234567890cdefghij"));
490     test(S("abcdefghij"), 1, 1, str, str+19, S("a1234567890123456789cdefghij"));
491     test(S("abcdefghij"), 1, 1, str, str+20, S("a12345678901234567890cdefghij"));
492 
493     return true;
494 }
495 
496 template <class S>
test4()497 TEST_CONSTEXPR_CXX20 bool test4()
498 {
499     test(S("abcdefghij"), 1, 4, str, str+0, S("afghij"));
500     test(S("abcdefghij"), 1, 4, str, str+0, S("afghij"));
501     test(S("abcdefghij"), 1, 4, str, str+1, S("a1fghij"));
502     test(S("abcdefghij"), 1, 4, str, str+2, S("a12fghij"));
503     test(S("abcdefghij"), 1, 4, str, str+4, S("a1234fghij"));
504     test(S("abcdefghij"), 1, 4, str, str+5, S("a12345fghij"));
505     test(S("abcdefghij"), 1, 4, str, str+0, S("afghij"));
506     test(S("abcdefghij"), 1, 4, str, str+1, S("a1fghij"));
507     test(S("abcdefghij"), 1, 4, str, str+5, S("a12345fghij"));
508     test(S("abcdefghij"), 1, 4, str, str+9, S("a123456789fghij"));
509     test(S("abcdefghij"), 1, 4, str, str+10, S("a1234567890fghij"));
510     test(S("abcdefghij"), 1, 4, str, str+0, S("afghij"));
511     test(S("abcdefghij"), 1, 4, str, str+1, S("a1fghij"));
512     test(S("abcdefghij"), 1, 4, str, str+10, S("a1234567890fghij"));
513     test(S("abcdefghij"), 1, 4, str, str+19, S("a1234567890123456789fghij"));
514     test(S("abcdefghij"), 1, 4, str, str+20, S("a12345678901234567890fghij"));
515     test(S("abcdefghij"), 1, 8, str, str+0, S("aj"));
516     test(S("abcdefghij"), 1, 8, str, str+0, S("aj"));
517     test(S("abcdefghij"), 1, 8, str, str+1, S("a1j"));
518     test(S("abcdefghij"), 1, 8, str, str+2, S("a12j"));
519     test(S("abcdefghij"), 1, 8, str, str+4, S("a1234j"));
520     test(S("abcdefghij"), 1, 8, str, str+5, S("a12345j"));
521     test(S("abcdefghij"), 1, 8, str, str+0, S("aj"));
522     test(S("abcdefghij"), 1, 8, str, str+1, S("a1j"));
523     test(S("abcdefghij"), 1, 8, str, str+5, S("a12345j"));
524     test(S("abcdefghij"), 1, 8, str, str+9, S("a123456789j"));
525     test(S("abcdefghij"), 1, 8, str, str+10, S("a1234567890j"));
526     test(S("abcdefghij"), 1, 8, str, str+0, S("aj"));
527     test(S("abcdefghij"), 1, 8, str, str+1, S("a1j"));
528     test(S("abcdefghij"), 1, 8, str, str+10, S("a1234567890j"));
529     test(S("abcdefghij"), 1, 8, str, str+19, S("a1234567890123456789j"));
530     test(S("abcdefghij"), 1, 8, str, str+20, S("a12345678901234567890j"));
531     test(S("abcdefghij"), 1, 9, str, str+0, S("a"));
532     test(S("abcdefghij"), 1, 9, str, str+0, S("a"));
533     test(S("abcdefghij"), 1, 9, str, str+1, S("a1"));
534     test(S("abcdefghij"), 1, 9, str, str+2, S("a12"));
535     test(S("abcdefghij"), 1, 9, str, str+4, S("a1234"));
536     test(S("abcdefghij"), 1, 9, str, str+5, S("a12345"));
537     test(S("abcdefghij"), 1, 9, str, str+0, S("a"));
538     test(S("abcdefghij"), 1, 9, str, str+1, S("a1"));
539     test(S("abcdefghij"), 1, 9, str, str+5, S("a12345"));
540     test(S("abcdefghij"), 1, 9, str, str+9, S("a123456789"));
541     test(S("abcdefghij"), 1, 9, str, str+10, S("a1234567890"));
542     test(S("abcdefghij"), 1, 9, str, str+0, S("a"));
543     test(S("abcdefghij"), 1, 9, str, str+1, S("a1"));
544     test(S("abcdefghij"), 1, 9, str, str+10, S("a1234567890"));
545     test(S("abcdefghij"), 1, 9, str, str+19, S("a1234567890123456789"));
546     test(S("abcdefghij"), 1, 9, str, str+20, S("a12345678901234567890"));
547     test(S("abcdefghij"), 5, 0, str, str+0, S("abcdefghij"));
548     test(S("abcdefghij"), 5, 0, str, str+0, S("abcdefghij"));
549     test(S("abcdefghij"), 5, 0, str, str+1, S("abcde1fghij"));
550     test(S("abcdefghij"), 5, 0, str, str+2, S("abcde12fghij"));
551     test(S("abcdefghij"), 5, 0, str, str+4, S("abcde1234fghij"));
552     test(S("abcdefghij"), 5, 0, str, str+5, S("abcde12345fghij"));
553     test(S("abcdefghij"), 5, 0, str, str+0, S("abcdefghij"));
554     test(S("abcdefghij"), 5, 0, str, str+1, S("abcde1fghij"));
555     test(S("abcdefghij"), 5, 0, str, str+5, S("abcde12345fghij"));
556     test(S("abcdefghij"), 5, 0, str, str+9, S("abcde123456789fghij"));
557     test(S("abcdefghij"), 5, 0, str, str+10, S("abcde1234567890fghij"));
558     test(S("abcdefghij"), 5, 0, str, str+0, S("abcdefghij"));
559     test(S("abcdefghij"), 5, 0, str, str+1, S("abcde1fghij"));
560     test(S("abcdefghij"), 5, 0, str, str+10, S("abcde1234567890fghij"));
561     test(S("abcdefghij"), 5, 0, str, str+19, S("abcde1234567890123456789fghij"));
562     test(S("abcdefghij"), 5, 0, str, str+20, S("abcde12345678901234567890fghij"));
563     test(S("abcdefghij"), 5, 1, str, str+0, S("abcdeghij"));
564     test(S("abcdefghij"), 5, 1, str, str+0, S("abcdeghij"));
565     test(S("abcdefghij"), 5, 1, str, str+1, S("abcde1ghij"));
566     test(S("abcdefghij"), 5, 1, str, str+2, S("abcde12ghij"));
567     test(S("abcdefghij"), 5, 1, str, str+4, S("abcde1234ghij"));
568     test(S("abcdefghij"), 5, 1, str, str+5, S("abcde12345ghij"));
569     test(S("abcdefghij"), 5, 1, str, str+0, S("abcdeghij"));
570     test(S("abcdefghij"), 5, 1, str, str+1, S("abcde1ghij"));
571     test(S("abcdefghij"), 5, 1, str, str+5, S("abcde12345ghij"));
572     test(S("abcdefghij"), 5, 1, str, str+9, S("abcde123456789ghij"));
573     test(S("abcdefghij"), 5, 1, str, str+10, S("abcde1234567890ghij"));
574     test(S("abcdefghij"), 5, 1, str, str+0, S("abcdeghij"));
575     test(S("abcdefghij"), 5, 1, str, str+1, S("abcde1ghij"));
576     test(S("abcdefghij"), 5, 1, str, str+10, S("abcde1234567890ghij"));
577     test(S("abcdefghij"), 5, 1, str, str+19, S("abcde1234567890123456789ghij"));
578     test(S("abcdefghij"), 5, 1, str, str+20, S("abcde12345678901234567890ghij"));
579     test(S("abcdefghij"), 5, 2, str, str+0, S("abcdehij"));
580     test(S("abcdefghij"), 5, 2, str, str+0, S("abcdehij"));
581     test(S("abcdefghij"), 5, 2, str, str+1, S("abcde1hij"));
582     test(S("abcdefghij"), 5, 2, str, str+2, S("abcde12hij"));
583     test(S("abcdefghij"), 5, 2, str, str+4, S("abcde1234hij"));
584     test(S("abcdefghij"), 5, 2, str, str+5, S("abcde12345hij"));
585     test(S("abcdefghij"), 5, 2, str, str+0, S("abcdehij"));
586     test(S("abcdefghij"), 5, 2, str, str+1, S("abcde1hij"));
587     test(S("abcdefghij"), 5, 2, str, str+5, S("abcde12345hij"));
588     test(S("abcdefghij"), 5, 2, str, str+9, S("abcde123456789hij"));
589     test(S("abcdefghij"), 5, 2, str, str+10, S("abcde1234567890hij"));
590     test(S("abcdefghij"), 5, 2, str, str+0, S("abcdehij"));
591     test(S("abcdefghij"), 5, 2, str, str+1, S("abcde1hij"));
592     test(S("abcdefghij"), 5, 2, str, str+10, S("abcde1234567890hij"));
593     test(S("abcdefghij"), 5, 2, str, str+19, S("abcde1234567890123456789hij"));
594     test(S("abcdefghij"), 5, 2, str, str+20, S("abcde12345678901234567890hij"));
595     test(S("abcdefghij"), 5, 4, str, str+0, S("abcdej"));
596     test(S("abcdefghij"), 5, 4, str, str+0, S("abcdej"));
597     test(S("abcdefghij"), 5, 4, str, str+1, S("abcde1j"));
598     test(S("abcdefghij"), 5, 4, str, str+2, S("abcde12j"));
599 
600     return true;
601 }
602 
603 template <class S>
test5()604 TEST_CONSTEXPR_CXX20 bool test5()
605 {
606     test(S("abcdefghij"), 5, 4, str, str+4, S("abcde1234j"));
607     test(S("abcdefghij"), 5, 4, str, str+5, S("abcde12345j"));
608     test(S("abcdefghij"), 5, 4, str, str+0, S("abcdej"));
609     test(S("abcdefghij"), 5, 4, str, str+1, S("abcde1j"));
610     test(S("abcdefghij"), 5, 4, str, str+5, S("abcde12345j"));
611     test(S("abcdefghij"), 5, 4, str, str+9, S("abcde123456789j"));
612     test(S("abcdefghij"), 5, 4, str, str+10, S("abcde1234567890j"));
613     test(S("abcdefghij"), 5, 4, str, str+0, S("abcdej"));
614     test(S("abcdefghij"), 5, 4, str, str+1, S("abcde1j"));
615     test(S("abcdefghij"), 5, 4, str, str+10, S("abcde1234567890j"));
616     test(S("abcdefghij"), 5, 4, str, str+19, S("abcde1234567890123456789j"));
617     test(S("abcdefghij"), 5, 4, str, str+20, S("abcde12345678901234567890j"));
618     test(S("abcdefghij"), 5, 5, str, str+0, S("abcde"));
619     test(S("abcdefghij"), 5, 5, str, str+0, S("abcde"));
620     test(S("abcdefghij"), 5, 5, str, str+1, S("abcde1"));
621     test(S("abcdefghij"), 5, 5, str, str+2, S("abcde12"));
622     test(S("abcdefghij"), 5, 5, str, str+4, S("abcde1234"));
623     test(S("abcdefghij"), 5, 5, str, str+5, S("abcde12345"));
624     test(S("abcdefghij"), 5, 5, str, str+0, S("abcde"));
625     test(S("abcdefghij"), 5, 5, str, str+1, S("abcde1"));
626     test(S("abcdefghij"), 5, 5, str, str+5, S("abcde12345"));
627     test(S("abcdefghij"), 5, 5, str, str+9, S("abcde123456789"));
628     test(S("abcdefghij"), 5, 5, str, str+10, S("abcde1234567890"));
629     test(S("abcdefghij"), 5, 5, str, str+0, S("abcde"));
630     test(S("abcdefghij"), 5, 5, str, str+1, S("abcde1"));
631     test(S("abcdefghij"), 5, 5, str, str+10, S("abcde1234567890"));
632     test(S("abcdefghij"), 5, 5, str, str+19, S("abcde1234567890123456789"));
633     test(S("abcdefghij"), 5, 5, str, str+20, S("abcde12345678901234567890"));
634     test(S("abcdefghij"), 9, 0, str, str+0, S("abcdefghij"));
635     test(S("abcdefghij"), 9, 0, str, str+0, S("abcdefghij"));
636     test(S("abcdefghij"), 9, 0, str, str+1, S("abcdefghi1j"));
637     test(S("abcdefghij"), 9, 0, str, str+2, S("abcdefghi12j"));
638     test(S("abcdefghij"), 9, 0, str, str+4, S("abcdefghi1234j"));
639     test(S("abcdefghij"), 9, 0, str, str+5, S("abcdefghi12345j"));
640     test(S("abcdefghij"), 9, 0, str, str+0, S("abcdefghij"));
641     test(S("abcdefghij"), 9, 0, str, str+1, S("abcdefghi1j"));
642     test(S("abcdefghij"), 9, 0, str, str+5, S("abcdefghi12345j"));
643     test(S("abcdefghij"), 9, 0, str, str+9, S("abcdefghi123456789j"));
644     test(S("abcdefghij"), 9, 0, str, str+10, S("abcdefghi1234567890j"));
645     test(S("abcdefghij"), 9, 0, str, str+0, S("abcdefghij"));
646     test(S("abcdefghij"), 9, 0, str, str+1, S("abcdefghi1j"));
647     test(S("abcdefghij"), 9, 0, str, str+10, S("abcdefghi1234567890j"));
648     test(S("abcdefghij"), 9, 0, str, str+19, S("abcdefghi1234567890123456789j"));
649     test(S("abcdefghij"), 9, 0, str, str+20, S("abcdefghi12345678901234567890j"));
650     test(S("abcdefghij"), 9, 1, str, str+0, S("abcdefghi"));
651     test(S("abcdefghij"), 9, 1, str, str+0, S("abcdefghi"));
652     test(S("abcdefghij"), 9, 1, str, str+1, S("abcdefghi1"));
653     test(S("abcdefghij"), 9, 1, str, str+2, S("abcdefghi12"));
654     test(S("abcdefghij"), 9, 1, str, str+4, S("abcdefghi1234"));
655     test(S("abcdefghij"), 9, 1, str, str+5, S("abcdefghi12345"));
656     test(S("abcdefghij"), 9, 1, str, str+0, S("abcdefghi"));
657     test(S("abcdefghij"), 9, 1, str, str+1, S("abcdefghi1"));
658     test(S("abcdefghij"), 9, 1, str, str+5, S("abcdefghi12345"));
659     test(S("abcdefghij"), 9, 1, str, str+9, S("abcdefghi123456789"));
660     test(S("abcdefghij"), 9, 1, str, str+10, S("abcdefghi1234567890"));
661     test(S("abcdefghij"), 9, 1, str, str+0, S("abcdefghi"));
662     test(S("abcdefghij"), 9, 1, str, str+1, S("abcdefghi1"));
663     test(S("abcdefghij"), 9, 1, str, str+10, S("abcdefghi1234567890"));
664     test(S("abcdefghij"), 9, 1, str, str+19, S("abcdefghi1234567890123456789"));
665     test(S("abcdefghij"), 9, 1, str, str+20, S("abcdefghi12345678901234567890"));
666     test(S("abcdefghij"), 10, 0, str, str+0, S("abcdefghij"));
667     test(S("abcdefghij"), 10, 0, str, str+0, S("abcdefghij"));
668     test(S("abcdefghij"), 10, 0, str, str+1, S("abcdefghij1"));
669     test(S("abcdefghij"), 10, 0, str, str+2, S("abcdefghij12"));
670     test(S("abcdefghij"), 10, 0, str, str+4, S("abcdefghij1234"));
671     test(S("abcdefghij"), 10, 0, str, str+5, S("abcdefghij12345"));
672     test(S("abcdefghij"), 10, 0, str, str+0, S("abcdefghij"));
673     test(S("abcdefghij"), 10, 0, str, str+1, S("abcdefghij1"));
674     test(S("abcdefghij"), 10, 0, str, str+5, S("abcdefghij12345"));
675     test(S("abcdefghij"), 10, 0, str, str+9, S("abcdefghij123456789"));
676     test(S("abcdefghij"), 10, 0, str, str+10, S("abcdefghij1234567890"));
677     test(S("abcdefghij"), 10, 0, str, str+0, S("abcdefghij"));
678     test(S("abcdefghij"), 10, 0, str, str+1, S("abcdefghij1"));
679     test(S("abcdefghij"), 10, 0, str, str+10, S("abcdefghij1234567890"));
680     test(S("abcdefghij"), 10, 0, str, str+19, S("abcdefghij1234567890123456789"));
681     test(S("abcdefghij"), 10, 0, str, str+20, S("abcdefghij12345678901234567890"));
682     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+0, S("abcdefghijklmnopqrst"));
683     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+0, S("abcdefghijklmnopqrst"));
684     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+1, S("1abcdefghijklmnopqrst"));
685     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+2, S("12abcdefghijklmnopqrst"));
686     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+4, S("1234abcdefghijklmnopqrst"));
687     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+5, S("12345abcdefghijklmnopqrst"));
688     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+0, S("abcdefghijklmnopqrst"));
689     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+1, S("1abcdefghijklmnopqrst"));
690     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+5, S("12345abcdefghijklmnopqrst"));
691     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+9, S("123456789abcdefghijklmnopqrst"));
692     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+10, S("1234567890abcdefghijklmnopqrst"));
693     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+0, S("abcdefghijklmnopqrst"));
694     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+1, S("1abcdefghijklmnopqrst"));
695     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+10, S("1234567890abcdefghijklmnopqrst"));
696     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+19, S("1234567890123456789abcdefghijklmnopqrst"));
697     test(S("abcdefghijklmnopqrst"), 0, 0, str, str+20, S("12345678901234567890abcdefghijklmnopqrst"));
698     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+0, S("bcdefghijklmnopqrst"));
699     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+0, S("bcdefghijklmnopqrst"));
700     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+1, S("1bcdefghijklmnopqrst"));
701     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+2, S("12bcdefghijklmnopqrst"));
702     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+4, S("1234bcdefghijklmnopqrst"));
703     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+5, S("12345bcdefghijklmnopqrst"));
704     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+0, S("bcdefghijklmnopqrst"));
705     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+1, S("1bcdefghijklmnopqrst"));
706 
707     return true;
708 }
709 
710 template <class S>
test6()711 TEST_CONSTEXPR_CXX20 bool test6()
712 {
713     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+5, S("12345bcdefghijklmnopqrst"));
714     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+9, S("123456789bcdefghijklmnopqrst"));
715     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+10, S("1234567890bcdefghijklmnopqrst"));
716     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+0, S("bcdefghijklmnopqrst"));
717     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+1, S("1bcdefghijklmnopqrst"));
718     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+10, S("1234567890bcdefghijklmnopqrst"));
719     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+19, S("1234567890123456789bcdefghijklmnopqrst"));
720     test(S("abcdefghijklmnopqrst"), 0, 1, str, str+20, S("12345678901234567890bcdefghijklmnopqrst"));
721     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+0, S("klmnopqrst"));
722     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+0, S("klmnopqrst"));
723     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+1, S("1klmnopqrst"));
724     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+2, S("12klmnopqrst"));
725     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+4, S("1234klmnopqrst"));
726     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+5, S("12345klmnopqrst"));
727     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+0, S("klmnopqrst"));
728     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+1, S("1klmnopqrst"));
729     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+5, S("12345klmnopqrst"));
730     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+9, S("123456789klmnopqrst"));
731     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+10, S("1234567890klmnopqrst"));
732     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+0, S("klmnopqrst"));
733     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+1, S("1klmnopqrst"));
734     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+10, S("1234567890klmnopqrst"));
735     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+19, S("1234567890123456789klmnopqrst"));
736     test(S("abcdefghijklmnopqrst"), 0, 10, str, str+20, S("12345678901234567890klmnopqrst"));
737     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+0, S("t"));
738     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+0, S("t"));
739     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+1, S("1t"));
740     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+2, S("12t"));
741     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+4, S("1234t"));
742     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+5, S("12345t"));
743     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+0, S("t"));
744     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+1, S("1t"));
745     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+5, S("12345t"));
746     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+9, S("123456789t"));
747     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+10, S("1234567890t"));
748     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+0, S("t"));
749     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+1, S("1t"));
750     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+10, S("1234567890t"));
751     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+19, S("1234567890123456789t"));
752     test(S("abcdefghijklmnopqrst"), 0, 19, str, str+20, S("12345678901234567890t"));
753     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+0, S(""));
754     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+0, S(""));
755     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+1, S("1"));
756     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+2, S("12"));
757     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+4, S("1234"));
758     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+5, S("12345"));
759     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+0, S(""));
760     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+1, S("1"));
761     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+5, S("12345"));
762     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+9, S("123456789"));
763     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+10, S("1234567890"));
764     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+0, S(""));
765     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+1, S("1"));
766     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+10, S("1234567890"));
767     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+19, S("1234567890123456789"));
768     test(S("abcdefghijklmnopqrst"), 0, 20, str, str+20, S("12345678901234567890"));
769     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+0, S("abcdefghijklmnopqrst"));
770     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+0, S("abcdefghijklmnopqrst"));
771     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+1, S("a1bcdefghijklmnopqrst"));
772     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+2, S("a12bcdefghijklmnopqrst"));
773     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+4, S("a1234bcdefghijklmnopqrst"));
774     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+5, S("a12345bcdefghijklmnopqrst"));
775     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+0, S("abcdefghijklmnopqrst"));
776     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+1, S("a1bcdefghijklmnopqrst"));
777     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+5, S("a12345bcdefghijklmnopqrst"));
778     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+9, S("a123456789bcdefghijklmnopqrst"));
779     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+10, S("a1234567890bcdefghijklmnopqrst"));
780     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+0, S("abcdefghijklmnopqrst"));
781     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+1, S("a1bcdefghijklmnopqrst"));
782     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+10, S("a1234567890bcdefghijklmnopqrst"));
783     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+19, S("a1234567890123456789bcdefghijklmnopqrst"));
784     test(S("abcdefghijklmnopqrst"), 1, 0, str, str+20, S("a12345678901234567890bcdefghijklmnopqrst"));
785     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+0, S("acdefghijklmnopqrst"));
786     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+0, S("acdefghijklmnopqrst"));
787     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+1, S("a1cdefghijklmnopqrst"));
788     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+2, S("a12cdefghijklmnopqrst"));
789     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+4, S("a1234cdefghijklmnopqrst"));
790     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+5, S("a12345cdefghijklmnopqrst"));
791     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+0, S("acdefghijklmnopqrst"));
792     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+1, S("a1cdefghijklmnopqrst"));
793     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+5, S("a12345cdefghijklmnopqrst"));
794     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+9, S("a123456789cdefghijklmnopqrst"));
795     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+10, S("a1234567890cdefghijklmnopqrst"));
796     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+0, S("acdefghijklmnopqrst"));
797     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+1, S("a1cdefghijklmnopqrst"));
798     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+10, S("a1234567890cdefghijklmnopqrst"));
799     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+19, S("a1234567890123456789cdefghijklmnopqrst"));
800     test(S("abcdefghijklmnopqrst"), 1, 1, str, str+20, S("a12345678901234567890cdefghijklmnopqrst"));
801     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+0, S("aklmnopqrst"));
802     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+0, S("aklmnopqrst"));
803     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+1, S("a1klmnopqrst"));
804     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+2, S("a12klmnopqrst"));
805     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+4, S("a1234klmnopqrst"));
806     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+5, S("a12345klmnopqrst"));
807     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+0, S("aklmnopqrst"));
808     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+1, S("a1klmnopqrst"));
809     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+5, S("a12345klmnopqrst"));
810     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+9, S("a123456789klmnopqrst"));
811     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+10, S("a1234567890klmnopqrst"));
812     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+0, S("aklmnopqrst"));
813 
814     return true;
815 }
816 
817 template <class S>
test7()818 TEST_CONSTEXPR_CXX20 bool test7()
819 {
820     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+1, S("a1klmnopqrst"));
821     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+10, S("a1234567890klmnopqrst"));
822     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+19, S("a1234567890123456789klmnopqrst"));
823     test(S("abcdefghijklmnopqrst"), 1, 9, str, str+20, S("a12345678901234567890klmnopqrst"));
824     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+0, S("at"));
825     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+0, S("at"));
826     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+1, S("a1t"));
827     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+2, S("a12t"));
828     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+4, S("a1234t"));
829     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+5, S("a12345t"));
830     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+0, S("at"));
831     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+1, S("a1t"));
832     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+5, S("a12345t"));
833     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+9, S("a123456789t"));
834     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+10, S("a1234567890t"));
835     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+0, S("at"));
836     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+1, S("a1t"));
837     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+10, S("a1234567890t"));
838     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+19, S("a1234567890123456789t"));
839     test(S("abcdefghijklmnopqrst"), 1, 18, str, str+20, S("a12345678901234567890t"));
840     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+0, S("a"));
841     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+0, S("a"));
842     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+1, S("a1"));
843     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+2, S("a12"));
844     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+4, S("a1234"));
845     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+5, S("a12345"));
846     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+0, S("a"));
847     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+1, S("a1"));
848     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+5, S("a12345"));
849     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+9, S("a123456789"));
850     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+10, S("a1234567890"));
851     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+0, S("a"));
852     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+1, S("a1"));
853     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+10, S("a1234567890"));
854     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+19, S("a1234567890123456789"));
855     test(S("abcdefghijklmnopqrst"), 1, 19, str, str+20, S("a12345678901234567890"));
856     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+0, S("abcdefghijklmnopqrst"));
857     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+0, S("abcdefghijklmnopqrst"));
858     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+1, S("abcdefghij1klmnopqrst"));
859     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+2, S("abcdefghij12klmnopqrst"));
860     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+4, S("abcdefghij1234klmnopqrst"));
861     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+5, S("abcdefghij12345klmnopqrst"));
862     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+0, S("abcdefghijklmnopqrst"));
863     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+1, S("abcdefghij1klmnopqrst"));
864     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+5, S("abcdefghij12345klmnopqrst"));
865     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+9, S("abcdefghij123456789klmnopqrst"));
866     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+10, S("abcdefghij1234567890klmnopqrst"));
867     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+0, S("abcdefghijklmnopqrst"));
868     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+1, S("abcdefghij1klmnopqrst"));
869     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+10, S("abcdefghij1234567890klmnopqrst"));
870     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+19, S("abcdefghij1234567890123456789klmnopqrst"));
871     test(S("abcdefghijklmnopqrst"), 10, 0, str, str+20, S("abcdefghij12345678901234567890klmnopqrst"));
872     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+0, S("abcdefghijlmnopqrst"));
873     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+0, S("abcdefghijlmnopqrst"));
874     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+1, S("abcdefghij1lmnopqrst"));
875     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+2, S("abcdefghij12lmnopqrst"));
876     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+4, S("abcdefghij1234lmnopqrst"));
877     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+5, S("abcdefghij12345lmnopqrst"));
878     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+0, S("abcdefghijlmnopqrst"));
879     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+1, S("abcdefghij1lmnopqrst"));
880     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+5, S("abcdefghij12345lmnopqrst"));
881     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+9, S("abcdefghij123456789lmnopqrst"));
882     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+10, S("abcdefghij1234567890lmnopqrst"));
883     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+0, S("abcdefghijlmnopqrst"));
884     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+1, S("abcdefghij1lmnopqrst"));
885     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+10, S("abcdefghij1234567890lmnopqrst"));
886     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+19, S("abcdefghij1234567890123456789lmnopqrst"));
887     test(S("abcdefghijklmnopqrst"), 10, 1, str, str+20, S("abcdefghij12345678901234567890lmnopqrst"));
888     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+0, S("abcdefghijpqrst"));
889     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+0, S("abcdefghijpqrst"));
890     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+1, S("abcdefghij1pqrst"));
891     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+2, S("abcdefghij12pqrst"));
892     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+4, S("abcdefghij1234pqrst"));
893     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+5, S("abcdefghij12345pqrst"));
894     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+0, S("abcdefghijpqrst"));
895     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+1, S("abcdefghij1pqrst"));
896     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+5, S("abcdefghij12345pqrst"));
897     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+9, S("abcdefghij123456789pqrst"));
898     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+10, S("abcdefghij1234567890pqrst"));
899     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+0, S("abcdefghijpqrst"));
900     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+1, S("abcdefghij1pqrst"));
901     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+10, S("abcdefghij1234567890pqrst"));
902     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+19, S("abcdefghij1234567890123456789pqrst"));
903     test(S("abcdefghijklmnopqrst"), 10, 5, str, str+20, S("abcdefghij12345678901234567890pqrst"));
904     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+0, S("abcdefghijt"));
905     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+0, S("abcdefghijt"));
906     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+1, S("abcdefghij1t"));
907     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+2, S("abcdefghij12t"));
908     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+4, S("abcdefghij1234t"));
909     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+5, S("abcdefghij12345t"));
910     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+0, S("abcdefghijt"));
911     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+1, S("abcdefghij1t"));
912     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+5, S("abcdefghij12345t"));
913     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+9, S("abcdefghij123456789t"));
914     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+10, S("abcdefghij1234567890t"));
915     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+0, S("abcdefghijt"));
916     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+1, S("abcdefghij1t"));
917     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+10, S("abcdefghij1234567890t"));
918     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+19, S("abcdefghij1234567890123456789t"));
919     test(S("abcdefghijklmnopqrst"), 10, 9, str, str+20, S("abcdefghij12345678901234567890t"));
920 
921     return true;
922 }
923 
924 template <class S>
test8()925 TEST_CONSTEXPR_CXX20 bool test8()
926 {
927     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+0, S("abcdefghij"));
928     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+0, S("abcdefghij"));
929     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+1, S("abcdefghij1"));
930     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+2, S("abcdefghij12"));
931     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+4, S("abcdefghij1234"));
932     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+5, S("abcdefghij12345"));
933     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+0, S("abcdefghij"));
934     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+1, S("abcdefghij1"));
935     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+5, S("abcdefghij12345"));
936     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+9, S("abcdefghij123456789"));
937     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+10, S("abcdefghij1234567890"));
938     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+0, S("abcdefghij"));
939     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+1, S("abcdefghij1"));
940     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+10, S("abcdefghij1234567890"));
941     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+19, S("abcdefghij1234567890123456789"));
942     test(S("abcdefghijklmnopqrst"), 10, 10, str, str+20, S("abcdefghij12345678901234567890"));
943     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+0, S("abcdefghijklmnopqrst"));
944     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+0, S("abcdefghijklmnopqrst"));
945     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+1, S("abcdefghijklmnopqrs1t"));
946     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+2, S("abcdefghijklmnopqrs12t"));
947     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+4, S("abcdefghijklmnopqrs1234t"));
948     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+5, S("abcdefghijklmnopqrs12345t"));
949     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+0, S("abcdefghijklmnopqrst"));
950     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+1, S("abcdefghijklmnopqrs1t"));
951     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+5, S("abcdefghijklmnopqrs12345t"));
952     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+9, S("abcdefghijklmnopqrs123456789t"));
953     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+10, S("abcdefghijklmnopqrs1234567890t"));
954     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+0, S("abcdefghijklmnopqrst"));
955     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+1, S("abcdefghijklmnopqrs1t"));
956     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+10, S("abcdefghijklmnopqrs1234567890t"));
957     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+19, S("abcdefghijklmnopqrs1234567890123456789t"));
958     test(S("abcdefghijklmnopqrst"), 19, 0, str, str+20, S("abcdefghijklmnopqrs12345678901234567890t"));
959     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+0, S("abcdefghijklmnopqrs"));
960     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+0, S("abcdefghijklmnopqrs"));
961     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+1, S("abcdefghijklmnopqrs1"));
962     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+2, S("abcdefghijklmnopqrs12"));
963     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+4, S("abcdefghijklmnopqrs1234"));
964     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+5, S("abcdefghijklmnopqrs12345"));
965     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+0, S("abcdefghijklmnopqrs"));
966     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+1, S("abcdefghijklmnopqrs1"));
967     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+5, S("abcdefghijklmnopqrs12345"));
968     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+9, S("abcdefghijklmnopqrs123456789"));
969     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+10, S("abcdefghijklmnopqrs1234567890"));
970     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+0, S("abcdefghijklmnopqrs"));
971     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+1, S("abcdefghijklmnopqrs1"));
972     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+10, S("abcdefghijklmnopqrs1234567890"));
973     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+19, S("abcdefghijklmnopqrs1234567890123456789"));
974     test(S("abcdefghijklmnopqrst"), 19, 1, str, str+20, S("abcdefghijklmnopqrs12345678901234567890"));
975     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+0, S("abcdefghijklmnopqrst"));
976     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+0, S("abcdefghijklmnopqrst"));
977     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+1, S("abcdefghijklmnopqrst1"));
978     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+2, S("abcdefghijklmnopqrst12"));
979     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+4, S("abcdefghijklmnopqrst1234"));
980     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+5, S("abcdefghijklmnopqrst12345"));
981     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+0, S("abcdefghijklmnopqrst"));
982     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+1, S("abcdefghijklmnopqrst1"));
983     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+5, S("abcdefghijklmnopqrst12345"));
984     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+9, S("abcdefghijklmnopqrst123456789"));
985     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+10, S("abcdefghijklmnopqrst1234567890"));
986     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+0, S("abcdefghijklmnopqrst"));
987     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+1, S("abcdefghijklmnopqrst1"));
988     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+10, S("abcdefghijklmnopqrst1234567890"));
989     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+19, S("abcdefghijklmnopqrst1234567890123456789"));
990     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+20, S("abcdefghijklmnopqrst12345678901234567890"));
991 
992     return true;
993 }
994 
995 template <class S>
test9()996 TEST_CONSTEXPR_CXX20 bool test9() {
997 #ifndef TEST_HAS_NO_EXCEPTIONS
998   if (!TEST_IS_CONSTANT_EVALUATED) { // test iterator operations that throw
999     typedef ThrowingIterator<char> TIter;
1000     typedef cpp17_input_iterator<TIter> IIter;
1001     const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
1002     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, IIter(TIter(s, s+10, 4, TIter::TAIncrement)), IIter(TIter()));
1003     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, IIter(TIter(s, s+10, 5, TIter::TADereference)), IIter(TIter()));
1004     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, IIter(TIter(s, s+10, 6, TIter::TAComparison)), IIter(TIter()));
1005 
1006     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, TIter(s, s+10, 4, TIter::TAIncrement), TIter());
1007     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, TIter(s, s+10, 5, TIter::TADereference), TIter());
1008     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, TIter(s, s+10, 6, TIter::TAComparison), TIter());
1009 
1010     Widget w[100];
1011     test_exceptions(S("abcdefghijklmnopqrst"), 10, 5, w, w+100);
1012   }
1013 #endif
1014 
1015   { // test replacing into self
1016     S s_short = "123/";
1017     S s_long  = "Lorem ipsum dolor sit amet, consectetur/";
1018 
1019     s_short.replace(s_short.begin(), s_short.begin(), s_short.begin(), s_short.end());
1020     assert(s_short == "123/123/");
1021     s_short.replace(s_short.begin(), s_short.begin(), s_short.begin(), s_short.end());
1022     assert(s_short == "123/123/123/123/");
1023     s_short.replace(s_short.begin(), s_short.begin(), s_short.begin(), s_short.end());
1024     assert(s_short == "123/123/123/123/123/123/123/123/");
1025 
1026     s_long.replace(s_long.begin(), s_long.begin(), s_long.begin(), s_long.end());
1027     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
1028   }
1029 
1030   { // test assigning a different type
1031     const uint8_t pc[] = "ABCD";
1032     uint8_t        p[] = "EFGH";
1033 
1034     S s;
1035     s.replace(s.begin(), s.end(), pc, pc + 4);
1036     assert(s == "ABCD");
1037 
1038     s.clear();
1039     s.replace(s.begin(), s.end(), p, p + 4);
1040     assert(s == "EFGH");
1041   }
1042 
1043   return true;
1044 }
1045 
1046 template <class S>
test()1047 void test() {
1048   test0<S>();
1049   test1<S>();
1050   test2<S>();
1051   test3<S>();
1052   test4<S>();
1053   test5<S>();
1054   test6<S>();
1055   test7<S>();
1056   test8<S>();
1057   test9<S>();
1058 
1059 #if TEST_STD_VER > 17
1060   static_assert(test0<S>());
1061   static_assert(test1<S>());
1062   static_assert(test2<S>());
1063   static_assert(test3<S>());
1064   static_assert(test4<S>());
1065   static_assert(test5<S>());
1066   static_assert(test6<S>());
1067   static_assert(test7<S>());
1068   static_assert(test8<S>());
1069   static_assert(test9<S>());
1070 #endif
1071 }
1072 
main(int,char **)1073 int main(int, char**)
1074 {
1075   test<std::string>();
1076 #if TEST_STD_VER >= 11
1077   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
1078 #endif
1079 
1080   return 0;
1081 }
1082