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_view>
10 
11 // constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;
12 
13 #include <string_view>
14 #include <cassert>
15 #include <stdexcept>
16 
17 #include "test_macros.h"
18 #include "constexpr_char_traits.h"
19 
sign(int x)20 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
21 
22 template<typename CharT>
test1(std::basic_string_view<CharT> sv1,size_t pos1,size_t n1,std::basic_string_view<CharT> sv2,int expected)23 void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
24             std::basic_string_view<CharT> sv2, int expected ) {
25 #ifdef TEST_HAS_NO_EXCEPTIONS
26     if (pos1 <= sv1.size())
27         assert(sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
28 #else
29     try {
30         assert(sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
31         assert(pos1 <= sv1.size());
32     }
33     catch (const std::out_of_range&) {
34         assert(pos1 > sv1.size());
35     }
36 #endif
37 }
38 
39 
40 template<typename CharT>
test(const CharT * s1,size_t pos1,size_t n1,const CharT * s2,int expected)41 void test ( const CharT *s1, size_t pos1, size_t n1, const CharT  *s2, int expected ) {
42     typedef std::basic_string_view<CharT> string_view_t;
43     string_view_t sv1 ( s1 );
44     string_view_t sv2 ( s2 );
45     test1(sv1, pos1, n1, sv2, expected);
46 }
47 
test0()48 void test0()
49 {
50     test("", 0, 0, "", 0);
51     test("", 0, 0, "abcde", -5);
52     test("", 0, 0, "abcdefghij", -10);
53     test("", 0, 0, "abcdefghijklmnopqrst", -20);
54     test("", 0, 1, "", 0);
55     test("", 0, 1, "abcde", -5);
56     test("", 0, 1, "abcdefghij", -10);
57     test("", 0, 1, "abcdefghijklmnopqrst", -20);
58     test("", 1, 0, "", 0);
59     test("", 1, 0, "abcde", 0);
60     test("", 1, 0, "abcdefghij", 0);
61     test("", 1, 0, "abcdefghijklmnopqrst", 0);
62     test("abcde", 0, 0, "", 0);
63     test("abcde", 0, 0, "abcde", -5);
64     test("abcde", 0, 0, "abcdefghij", -10);
65     test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
66     test("abcde", 0, 1, "", 1);
67     test("abcde", 0, 1, "abcde", -4);
68     test("abcde", 0, 1, "abcdefghij", -9);
69     test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
70     test("abcde", 0, 2, "", 2);
71     test("abcde", 0, 2, "abcde", -3);
72     test("abcde", 0, 2, "abcdefghij", -8);
73     test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
74     test("abcde", 0, 4, "", 4);
75     test("abcde", 0, 4, "abcde", -1);
76     test("abcde", 0, 4, "abcdefghij", -6);
77     test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
78     test("abcde", 0, 5, "", 5);
79     test("abcde", 0, 5, "abcde", 0);
80     test("abcde", 0, 5, "abcdefghij", -5);
81     test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
82     test("abcde", 0, 6, "", 5);
83     test("abcde", 0, 6, "abcde", 0);
84     test("abcde", 0, 6, "abcdefghij", -5);
85     test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
86     test("abcde", 1, 0, "", 0);
87     test("abcde", 1, 0, "abcde", -5);
88     test("abcde", 1, 0, "abcdefghij", -10);
89     test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
90     test("abcde", 1, 1, "", 1);
91     test("abcde", 1, 1, "abcde", 1);
92     test("abcde", 1, 1, "abcdefghij", 1);
93     test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
94     test("abcde", 1, 2, "", 2);
95     test("abcde", 1, 2, "abcde", 1);
96     test("abcde", 1, 2, "abcdefghij", 1);
97     test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
98     test("abcde", 1, 3, "", 3);
99     test("abcde", 1, 3, "abcde", 1);
100     test("abcde", 1, 3, "abcdefghij", 1);
101     test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
102     test("abcde", 1, 4, "", 4);
103     test("abcde", 1, 4, "abcde", 1);
104     test("abcde", 1, 4, "abcdefghij", 1);
105     test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
106     test("abcde", 1, 5, "", 4);
107     test("abcde", 1, 5, "abcde", 1);
108     test("abcde", 1, 5, "abcdefghij", 1);
109     test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
110     test("abcde", 2, 0, "", 0);
111     test("abcde", 2, 0, "abcde", -5);
112     test("abcde", 2, 0, "abcdefghij", -10);
113     test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
114     test("abcde", 2, 1, "", 1);
115     test("abcde", 2, 1, "abcde", 2);
116     test("abcde", 2, 1, "abcdefghij", 2);
117     test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
118     test("abcde", 2, 2, "", 2);
119     test("abcde", 2, 2, "abcde", 2);
120     test("abcde", 2, 2, "abcdefghij", 2);
121     test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
122     test("abcde", 2, 3, "", 3);
123     test("abcde", 2, 3, "abcde", 2);
124     test("abcde", 2, 3, "abcdefghij", 2);
125     test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
126     test("abcde", 2, 4, "", 3);
127     test("abcde", 2, 4, "abcde", 2);
128     test("abcde", 2, 4, "abcdefghij", 2);
129     test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
130     test("abcde", 4, 0, "", 0);
131     test("abcde", 4, 0, "abcde", -5);
132     test("abcde", 4, 0, "abcdefghij", -10);
133     test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
134     test("abcde", 4, 1, "", 1);
135     test("abcde", 4, 1, "abcde", 4);
136     test("abcde", 4, 1, "abcdefghij", 4);
137     test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
138     test("abcde", 4, 2, "", 1);
139     test("abcde", 4, 2, "abcde", 4);
140     test("abcde", 4, 2, "abcdefghij", 4);
141     test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
142     test("abcde", 5, 0, "", 0);
143     test("abcde", 5, 0, "abcde", -5);
144     test("abcde", 5, 0, "abcdefghij", -10);
145     test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
146     test("abcde", 5, 1, "", 0);
147     test("abcde", 5, 1, "abcde", -5);
148     test("abcde", 5, 1, "abcdefghij", -10);
149     test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
150 }
151 
test1()152 void test1()
153 {
154     test("abcde", 6, 0, "", 0);
155     test("abcde", 6, 0, "abcde", 0);
156     test("abcde", 6, 0, "abcdefghij", 0);
157     test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
158     test("abcdefghij", 0, 0, "", 0);
159     test("abcdefghij", 0, 0, "abcde", -5);
160     test("abcdefghij", 0, 0, "abcdefghij", -10);
161     test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
162     test("abcdefghij", 0, 1, "", 1);
163     test("abcdefghij", 0, 1, "abcde", -4);
164     test("abcdefghij", 0, 1, "abcdefghij", -9);
165     test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
166     test("abcdefghij", 0, 5, "", 5);
167     test("abcdefghij", 0, 5, "abcde", 0);
168     test("abcdefghij", 0, 5, "abcdefghij", -5);
169     test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
170     test("abcdefghij", 0, 9, "", 9);
171     test("abcdefghij", 0, 9, "abcde", 4);
172     test("abcdefghij", 0, 9, "abcdefghij", -1);
173     test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
174     test("abcdefghij", 0, 10, "", 10);
175     test("abcdefghij", 0, 10, "abcde", 5);
176     test("abcdefghij", 0, 10, "abcdefghij", 0);
177     test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
178     test("abcdefghij", 0, 11, "", 10);
179     test("abcdefghij", 0, 11, "abcde", 5);
180     test("abcdefghij", 0, 11, "abcdefghij", 0);
181     test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
182     test("abcdefghij", 1, 0, "", 0);
183     test("abcdefghij", 1, 0, "abcde", -5);
184     test("abcdefghij", 1, 0, "abcdefghij", -10);
185     test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
186     test("abcdefghij", 1, 1, "", 1);
187     test("abcdefghij", 1, 1, "abcde", 1);
188     test("abcdefghij", 1, 1, "abcdefghij", 1);
189     test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
190     test("abcdefghij", 1, 4, "", 4);
191     test("abcdefghij", 1, 4, "abcde", 1);
192     test("abcdefghij", 1, 4, "abcdefghij", 1);
193     test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
194     test("abcdefghij", 1, 8, "", 8);
195     test("abcdefghij", 1, 8, "abcde", 1);
196     test("abcdefghij", 1, 8, "abcdefghij", 1);
197     test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
198     test("abcdefghij", 1, 9, "", 9);
199     test("abcdefghij", 1, 9, "abcde", 1);
200     test("abcdefghij", 1, 9, "abcdefghij", 1);
201     test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
202     test("abcdefghij", 1, 10, "", 9);
203     test("abcdefghij", 1, 10, "abcde", 1);
204     test("abcdefghij", 1, 10, "abcdefghij", 1);
205     test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
206     test("abcdefghij", 5, 0, "", 0);
207     test("abcdefghij", 5, 0, "abcde", -5);
208     test("abcdefghij", 5, 0, "abcdefghij", -10);
209     test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
210     test("abcdefghij", 5, 1, "", 1);
211     test("abcdefghij", 5, 1, "abcde", 5);
212     test("abcdefghij", 5, 1, "abcdefghij", 5);
213     test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
214     test("abcdefghij", 5, 2, "", 2);
215     test("abcdefghij", 5, 2, "abcde", 5);
216     test("abcdefghij", 5, 2, "abcdefghij", 5);
217     test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
218     test("abcdefghij", 5, 4, "", 4);
219     test("abcdefghij", 5, 4, "abcde", 5);
220     test("abcdefghij", 5, 4, "abcdefghij", 5);
221     test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
222     test("abcdefghij", 5, 5, "", 5);
223     test("abcdefghij", 5, 5, "abcde", 5);
224     test("abcdefghij", 5, 5, "abcdefghij", 5);
225     test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
226     test("abcdefghij", 5, 6, "", 5);
227     test("abcdefghij", 5, 6, "abcde", 5);
228     test("abcdefghij", 5, 6, "abcdefghij", 5);
229     test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
230     test("abcdefghij", 9, 0, "", 0);
231     test("abcdefghij", 9, 0, "abcde", -5);
232     test("abcdefghij", 9, 0, "abcdefghij", -10);
233     test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
234     test("abcdefghij", 9, 1, "", 1);
235     test("abcdefghij", 9, 1, "abcde", 9);
236     test("abcdefghij", 9, 1, "abcdefghij", 9);
237     test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
238     test("abcdefghij", 9, 2, "", 1);
239     test("abcdefghij", 9, 2, "abcde", 9);
240     test("abcdefghij", 9, 2, "abcdefghij", 9);
241     test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
242     test("abcdefghij", 10, 0, "", 0);
243     test("abcdefghij", 10, 0, "abcde", -5);
244     test("abcdefghij", 10, 0, "abcdefghij", -10);
245     test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
246     test("abcdefghij", 10, 1, "", 0);
247     test("abcdefghij", 10, 1, "abcde", -5);
248     test("abcdefghij", 10, 1, "abcdefghij", -10);
249     test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
250     test("abcdefghij", 11, 0, "", 0);
251     test("abcdefghij", 11, 0, "abcde", 0);
252     test("abcdefghij", 11, 0, "abcdefghij", 0);
253     test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
254 }
255 
test2()256 void test2()
257 {
258     test("abcdefghijklmnopqrst", 0, 0, "", 0);
259     test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
260     test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
261     test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
262     test("abcdefghijklmnopqrst", 0, 1, "", 1);
263     test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
264     test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
265     test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
266     test("abcdefghijklmnopqrst", 0, 10, "", 10);
267     test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
268     test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
269     test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
270     test("abcdefghijklmnopqrst", 0, 19, "", 19);
271     test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
272     test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
273     test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
274     test("abcdefghijklmnopqrst", 0, 20, "", 20);
275     test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
276     test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
277     test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
278     test("abcdefghijklmnopqrst", 0, 21, "", 20);
279     test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
280     test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
281     test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
282     test("abcdefghijklmnopqrst", 1, 0, "", 0);
283     test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
284     test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
285     test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
286     test("abcdefghijklmnopqrst", 1, 1, "", 1);
287     test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
288     test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
289     test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
290     test("abcdefghijklmnopqrst", 1, 9, "", 9);
291     test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
292     test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
293     test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
294     test("abcdefghijklmnopqrst", 1, 18, "", 18);
295     test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
296     test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
297     test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
298     test("abcdefghijklmnopqrst", 1, 19, "", 19);
299     test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
300     test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
301     test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
302     test("abcdefghijklmnopqrst", 1, 20, "", 19);
303     test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
304     test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
305     test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
306     test("abcdefghijklmnopqrst", 10, 0, "", 0);
307     test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
308     test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
309     test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
310     test("abcdefghijklmnopqrst", 10, 1, "", 1);
311     test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
312     test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
313     test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
314     test("abcdefghijklmnopqrst", 10, 5, "", 5);
315     test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
316     test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
317     test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
318     test("abcdefghijklmnopqrst", 10, 9, "", 9);
319     test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
320     test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
321     test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
322     test("abcdefghijklmnopqrst", 10, 10, "", 10);
323     test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
324     test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
325     test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
326     test("abcdefghijklmnopqrst", 10, 11, "", 10);
327     test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
328     test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
329     test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
330     test("abcdefghijklmnopqrst", 19, 0, "", 0);
331     test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
332     test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
333     test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
334     test("abcdefghijklmnopqrst", 19, 1, "", 1);
335     test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
336     test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
337     test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
338     test("abcdefghijklmnopqrst", 19, 2, "", 1);
339     test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
340     test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
341     test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
342     test("abcdefghijklmnopqrst", 20, 0, "", 0);
343     test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
344     test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
345     test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
346     test("abcdefghijklmnopqrst", 20, 1, "", 0);
347     test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
348     test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
349     test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
350     test("abcdefghijklmnopqrst", 21, 0, "", 0);
351     test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
352     test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
353     test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
354 }
355 
356 
main(int,char **)357 int main(int, char**) {
358     test0();
359     test1();
360     test2();
361 
362     {
363     test("abcde", 5, 1, "", 0);
364     test("abcde", 2, 4, "", 3);
365     test("abcde", 2, 4, "abcde", 2);
366     test("ABCde", 2, 4, "abcde", -1);
367     }
368 
369     {
370     test(L"abcde", 5, 1, L"", 0);
371     test(L"abcde", 2, 4, L"", 3);
372     test(L"abcde", 2, 4, L"abcde", 2);
373     test(L"ABCde", 2, 4, L"abcde", -1);
374     }
375 
376 #if TEST_STD_VER >= 11
377     {
378     test(u"abcde", 5, 1, u"", 0);
379     test(u"abcde", 2, 4, u"", 3);
380     test(u"abcde", 2, 4, u"abcde", 2);
381     test(u"ABCde", 2, 4, u"abcde", -1);
382     }
383 
384     {
385     test(U"abcde", 5, 1, U"", 0);
386     test(U"abcde", 2, 4, U"", 3);
387     test(U"abcde", 2, 4, U"abcde", 2);
388     test(U"ABCde", 2, 4, U"abcde", -1);
389     }
390 #endif
391 
392 #if TEST_STD_VER > 11
393     {
394     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
395     constexpr SV  sv1 { "abcde", 5 };
396     constexpr SV  sv2 { "abcde", 0 };
397     static_assert ( sv1.compare(5, 1, sv2) == 0, "" );
398     static_assert ( sv1.compare(2, 4, sv2) > 0, "" );
399     }
400 #endif
401 
402   return 0;
403 }
404