• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <string_view>
11 
12 // constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
13 
14 #include <string_view>
15 #include <cassert>
16 #include <stdexcept>
17 
18 #include "test_macros.h"
19 #include "constexpr_char_traits.hpp"
20 
sign(int x)21 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
22 
23 template<typename CharT>
test1(std::basic_string_view<CharT> sv1,size_t pos1,size_t n1,const CharT * s,int expected)24 void test1 ( std::basic_string_view<CharT> sv1,
25              size_t pos1, size_t n1, const CharT *s, int expected ) {
26 #ifdef TEST_HAS_NO_EXCEPTIONS
27     if (pos1 <= sv1.size())
28         assert(sign(sv1.compare(pos1, n1, s)) == sign(expected));
29 #else
30     try {
31         assert(sign(sv1.compare(pos1, n1, s)) == sign(expected));
32         assert(pos1 <= sv1.size());
33     }
34     catch (const std::out_of_range&) {
35         assert(pos1 > sv1.size());
36     }
37 #endif
38 }
39 
40 template<typename CharT>
41 void
test(const CharT * s1,size_t pos1,size_t n1,const CharT * s2,int expected)42 test( const CharT *s1, size_t pos1, size_t n1, const CharT *s2, int expected)
43 {
44     typedef std::basic_string_view<CharT> string_view_t;
45     string_view_t sv1 ( s1 );
46     test1 ( sv1, pos1, n1, s2, expected );
47 }
48 
test0()49 void test0()
50 {
51     test("", 0, 0, "", 0);
52     test("", 0, 0, "abcde", -5);
53     test("", 0, 0, "abcdefghij", -10);
54     test("", 0, 0, "abcdefghijklmnopqrst", -20);
55     test("", 0, 1, "", 0);
56     test("", 0, 1, "abcde", -5);
57     test("", 0, 1, "abcdefghij", -10);
58     test("", 0, 1, "abcdefghijklmnopqrst", -20);
59     test("", 1, 0, "", 0);
60     test("", 1, 0, "abcde", 0);
61     test("", 1, 0, "abcdefghij", 0);
62     test("", 1, 0, "abcdefghijklmnopqrst", 0);
63     test("abcde", 0, 0, "", 0);
64     test("abcde", 0, 0, "abcde", -5);
65     test("abcde", 0, 0, "abcdefghij", -10);
66     test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
67     test("abcde", 0, 1, "", 1);
68     test("abcde", 0, 1, "abcde", -4);
69     test("abcde", 0, 1, "abcdefghij", -9);
70     test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
71     test("abcde", 0, 2, "", 2);
72     test("abcde", 0, 2, "abcde", -3);
73     test("abcde", 0, 2, "abcdefghij", -8);
74     test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
75     test("abcde", 0, 4, "", 4);
76     test("abcde", 0, 4, "abcde", -1);
77     test("abcde", 0, 4, "abcdefghij", -6);
78     test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
79     test("abcde", 0, 5, "", 5);
80     test("abcde", 0, 5, "abcde", 0);
81     test("abcde", 0, 5, "abcdefghij", -5);
82     test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
83     test("abcde", 0, 6, "", 5);
84     test("abcde", 0, 6, "abcde", 0);
85     test("abcde", 0, 6, "abcdefghij", -5);
86     test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
87     test("abcde", 1, 0, "", 0);
88     test("abcde", 1, 0, "abcde", -5);
89     test("abcde", 1, 0, "abcdefghij", -10);
90     test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
91     test("abcde", 1, 1, "", 1);
92     test("abcde", 1, 1, "abcde", 1);
93     test("abcde", 1, 1, "abcdefghij", 1);
94     test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
95     test("abcde", 1, 2, "", 2);
96     test("abcde", 1, 2, "abcde", 1);
97     test("abcde", 1, 2, "abcdefghij", 1);
98     test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
99     test("abcde", 1, 3, "", 3);
100     test("abcde", 1, 3, "abcde", 1);
101     test("abcde", 1, 3, "abcdefghij", 1);
102     test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
103     test("abcde", 1, 4, "", 4);
104     test("abcde", 1, 4, "abcde", 1);
105     test("abcde", 1, 4, "abcdefghij", 1);
106     test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
107     test("abcde", 1, 5, "", 4);
108     test("abcde", 1, 5, "abcde", 1);
109     test("abcde", 1, 5, "abcdefghij", 1);
110     test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
111     test("abcde", 2, 0, "", 0);
112     test("abcde", 2, 0, "abcde", -5);
113     test("abcde", 2, 0, "abcdefghij", -10);
114     test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
115     test("abcde", 2, 1, "", 1);
116     test("abcde", 2, 1, "abcde", 2);
117     test("abcde", 2, 1, "abcdefghij", 2);
118     test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
119     test("abcde", 2, 2, "", 2);
120     test("abcde", 2, 2, "abcde", 2);
121     test("abcde", 2, 2, "abcdefghij", 2);
122     test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
123     test("abcde", 2, 3, "", 3);
124     test("abcde", 2, 3, "abcde", 2);
125     test("abcde", 2, 3, "abcdefghij", 2);
126     test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
127     test("abcde", 2, 4, "", 3);
128     test("abcde", 2, 4, "abcde", 2);
129     test("abcde", 2, 4, "abcdefghij", 2);
130     test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
131     test("abcde", 4, 0, "", 0);
132     test("abcde", 4, 0, "abcde", -5);
133     test("abcde", 4, 0, "abcdefghij", -10);
134     test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
135     test("abcde", 4, 1, "", 1);
136     test("abcde", 4, 1, "abcde", 4);
137     test("abcde", 4, 1, "abcdefghij", 4);
138     test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
139     test("abcde", 4, 2, "", 1);
140     test("abcde", 4, 2, "abcde", 4);
141     test("abcde", 4, 2, "abcdefghij", 4);
142     test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
143     test("abcde", 5, 0, "", 0);
144     test("abcde", 5, 0, "abcde", -5);
145     test("abcde", 5, 0, "abcdefghij", -10);
146     test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
147     test("abcde", 5, 1, "", 0);
148     test("abcde", 5, 1, "abcde", -5);
149     test("abcde", 5, 1, "abcdefghij", -10);
150     test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
151 }
152 
test1()153 void test1()
154 {
155     test("abcde", 6, 0, "", 0);
156     test("abcde", 6, 0, "abcde", 0);
157     test("abcde", 6, 0, "abcdefghij", 0);
158     test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
159     test("abcdefghij", 0, 0, "", 0);
160     test("abcdefghij", 0, 0, "abcde", -5);
161     test("abcdefghij", 0, 0, "abcdefghij", -10);
162     test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
163     test("abcdefghij", 0, 1, "", 1);
164     test("abcdefghij", 0, 1, "abcde", -4);
165     test("abcdefghij", 0, 1, "abcdefghij", -9);
166     test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
167     test("abcdefghij", 0, 5, "", 5);
168     test("abcdefghij", 0, 5, "abcde", 0);
169     test("abcdefghij", 0, 5, "abcdefghij", -5);
170     test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
171     test("abcdefghij", 0, 9, "", 9);
172     test("abcdefghij", 0, 9, "abcde", 4);
173     test("abcdefghij", 0, 9, "abcdefghij", -1);
174     test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
175     test("abcdefghij", 0, 10, "", 10);
176     test("abcdefghij", 0, 10, "abcde", 5);
177     test("abcdefghij", 0, 10, "abcdefghij", 0);
178     test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
179     test("abcdefghij", 0, 11, "", 10);
180     test("abcdefghij", 0, 11, "abcde", 5);
181     test("abcdefghij", 0, 11, "abcdefghij", 0);
182     test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
183     test("abcdefghij", 1, 0, "", 0);
184     test("abcdefghij", 1, 0, "abcde", -5);
185     test("abcdefghij", 1, 0, "abcdefghij", -10);
186     test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
187     test("abcdefghij", 1, 1, "", 1);
188     test("abcdefghij", 1, 1, "abcde", 1);
189     test("abcdefghij", 1, 1, "abcdefghij", 1);
190     test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
191     test("abcdefghij", 1, 4, "", 4);
192     test("abcdefghij", 1, 4, "abcde", 1);
193     test("abcdefghij", 1, 4, "abcdefghij", 1);
194     test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
195     test("abcdefghij", 1, 8, "", 8);
196     test("abcdefghij", 1, 8, "abcde", 1);
197     test("abcdefghij", 1, 8, "abcdefghij", 1);
198     test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
199     test("abcdefghij", 1, 9, "", 9);
200     test("abcdefghij", 1, 9, "abcde", 1);
201     test("abcdefghij", 1, 9, "abcdefghij", 1);
202     test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
203     test("abcdefghij", 1, 10, "", 9);
204     test("abcdefghij", 1, 10, "abcde", 1);
205     test("abcdefghij", 1, 10, "abcdefghij", 1);
206     test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
207     test("abcdefghij", 5, 0, "", 0);
208     test("abcdefghij", 5, 0, "abcde", -5);
209     test("abcdefghij", 5, 0, "abcdefghij", -10);
210     test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
211     test("abcdefghij", 5, 1, "", 1);
212     test("abcdefghij", 5, 1, "abcde", 5);
213     test("abcdefghij", 5, 1, "abcdefghij", 5);
214     test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
215     test("abcdefghij", 5, 2, "", 2);
216     test("abcdefghij", 5, 2, "abcde", 5);
217     test("abcdefghij", 5, 2, "abcdefghij", 5);
218     test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
219     test("abcdefghij", 5, 4, "", 4);
220     test("abcdefghij", 5, 4, "abcde", 5);
221     test("abcdefghij", 5, 4, "abcdefghij", 5);
222     test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
223     test("abcdefghij", 5, 5, "", 5);
224     test("abcdefghij", 5, 5, "abcde", 5);
225     test("abcdefghij", 5, 5, "abcdefghij", 5);
226     test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
227     test("abcdefghij", 5, 6, "", 5);
228     test("abcdefghij", 5, 6, "abcde", 5);
229     test("abcdefghij", 5, 6, "abcdefghij", 5);
230     test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
231     test("abcdefghij", 9, 0, "", 0);
232     test("abcdefghij", 9, 0, "abcde", -5);
233     test("abcdefghij", 9, 0, "abcdefghij", -10);
234     test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
235     test("abcdefghij", 9, 1, "", 1);
236     test("abcdefghij", 9, 1, "abcde", 9);
237     test("abcdefghij", 9, 1, "abcdefghij", 9);
238     test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
239     test("abcdefghij", 9, 2, "", 1);
240     test("abcdefghij", 9, 2, "abcde", 9);
241     test("abcdefghij", 9, 2, "abcdefghij", 9);
242     test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
243     test("abcdefghij", 10, 0, "", 0);
244     test("abcdefghij", 10, 0, "abcde", -5);
245     test("abcdefghij", 10, 0, "abcdefghij", -10);
246     test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
247     test("abcdefghij", 10, 1, "", 0);
248     test("abcdefghij", 10, 1, "abcde", -5);
249     test("abcdefghij", 10, 1, "abcdefghij", -10);
250     test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
251     test("abcdefghij", 11, 0, "", 0);
252     test("abcdefghij", 11, 0, "abcde", 0);
253     test("abcdefghij", 11, 0, "abcdefghij", 0);
254     test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
255 }
256 
test2()257 void test2()
258 {
259     test("abcdefghijklmnopqrst", 0, 0, "", 0);
260     test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
261     test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
262     test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
263     test("abcdefghijklmnopqrst", 0, 1, "", 1);
264     test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
265     test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
266     test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
267     test("abcdefghijklmnopqrst", 0, 10, "", 10);
268     test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
269     test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
270     test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
271     test("abcdefghijklmnopqrst", 0, 19, "", 19);
272     test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
273     test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
274     test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
275     test("abcdefghijklmnopqrst", 0, 20, "", 20);
276     test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
277     test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
278     test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
279     test("abcdefghijklmnopqrst", 0, 21, "", 20);
280     test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
281     test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
282     test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
283     test("abcdefghijklmnopqrst", 1, 0, "", 0);
284     test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
285     test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
286     test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
287     test("abcdefghijklmnopqrst", 1, 1, "", 1);
288     test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
289     test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
290     test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
291     test("abcdefghijklmnopqrst", 1, 9, "", 9);
292     test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
293     test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
294     test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
295     test("abcdefghijklmnopqrst", 1, 18, "", 18);
296     test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
297     test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
298     test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
299     test("abcdefghijklmnopqrst", 1, 19, "", 19);
300     test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
301     test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
302     test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
303     test("abcdefghijklmnopqrst", 1, 20, "", 19);
304     test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
305     test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
306     test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
307     test("abcdefghijklmnopqrst", 10, 0, "", 0);
308     test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
309     test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
310     test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
311     test("abcdefghijklmnopqrst", 10, 1, "", 1);
312     test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
313     test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
314     test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
315     test("abcdefghijklmnopqrst", 10, 5, "", 5);
316     test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
317     test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
318     test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
319     test("abcdefghijklmnopqrst", 10, 9, "", 9);
320     test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
321     test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
322     test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
323     test("abcdefghijklmnopqrst", 10, 10, "", 10);
324     test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
325     test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
326     test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
327     test("abcdefghijklmnopqrst", 10, 11, "", 10);
328     test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
329     test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
330     test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
331     test("abcdefghijklmnopqrst", 19, 0, "", 0);
332     test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
333     test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
334     test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
335     test("abcdefghijklmnopqrst", 19, 1, "", 1);
336     test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
337     test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
338     test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
339     test("abcdefghijklmnopqrst", 19, 2, "", 1);
340     test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
341     test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
342     test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
343     test("abcdefghijklmnopqrst", 20, 0, "", 0);
344     test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
345     test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
346     test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
347     test("abcdefghijklmnopqrst", 20, 1, "", 0);
348     test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
349     test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
350     test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
351     test("abcdefghijklmnopqrst", 21, 0, "", 0);
352     test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
353     test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
354     test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
355 }
356 
357 
main()358 int main()
359 {
360     test0();
361     test1();
362     test2();
363 
364     {
365     test("", 0, 0, "", 0);
366     test("", 0, 0, "abcde", -5);
367     test("", 0, 0, "abcdefghij", -10);
368     test("", 0, 0, "abcdefghijklmnopqrst", -20);
369     test("abcde", 0, 2, "", 5);
370     test("abcde", 0, 6,"abcde", 0);
371     test("abcde", 0, 6, "abcdefghij", -5);
372     test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
373     test("abcdefghij", 3, 3, "", 10);
374     test("abcdefghij", 3, 3,"abcde", 5);
375     test("abcdefghij", 3, 3, "def", 0);
376     test("abcdefghij", 0, 4, "abcdefghijklmnopqrst", -10);
377     test("abcdefghijklmnopqrst", 5, 5, "", 20);
378     test("abcdefghijklmnopqrst", 0, 8, "abcde", 15);
379     test("abcdefghijklmnopqrst", 0, 12, "abcdefghij", 10);
380     test("abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), "abcdefghijklmnopqrst", 0);
381     }
382 
383     {
384     test(L"", 0, 0, L"", 0);
385     test(L"", 0, 0, L"abcde", -5);
386     test(L"", 0, 0, L"abcdefghij", -10);
387     test(L"", 0, 0, L"abcdefghijklmnopqrst", -20);
388     test(L"abcde", 0, 2, L"", 5);
389     test(L"abcde", 0, 6, L"abcde", 0);
390     test(L"abcde", 0, 6, L"abcdefghij", -5);
391     test(L"abcde", 0, 6, L"abcdefghijklmnopqrst", -15);
392     test(L"abcdefghij", 3, 3, L"", 10);
393     test(L"abcdefghij", 3, 3, L"abcde", 5);
394     test(L"abcdefghij", 3, 3, L"def", 0);
395     test(L"abcdefghij", 0, 4, L"abcdefghijklmnopqrst", -10);
396     test(L"abcdefghijklmnopqrst", 5, 5, L"", 20);
397     test(L"abcdefghijklmnopqrst", 0, 8, L"abcde", 15);
398     test(L"abcdefghijklmnopqrst", 0, 12, L"abcdefghij", 10);
399     test(L"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), L"abcdefghijklmnopqrst", 0);
400     }
401 
402 #if TEST_STD_VER >= 11
403     {
404     test(U"", 0, 0, U"", 0);
405     test(U"", 0, 0, U"abcde", -5);
406     test(U"", 0, 0, U"abcdefghij", -10);
407     test(U"", 0, 0, U"abcdefghijklmnopqrst", -20);
408     test(U"abcde", 0, 2, U"", 5);
409     test(U"abcde", 0, 6, U"abcde", 0);
410     test(U"abcde", 0, 6, U"abcdefghij", -5);
411     test(U"abcde", 0, 6, U"abcdefghijklmnopqrst", -15);
412     test(U"abcdefghij", 3, 3, U"", 10);
413     test(U"abcdefghij", 3, 3, U"abcde", 5);
414     test(U"abcdefghij", 3, 3, U"def", 0);
415     test(U"abcdefghij", 0, 4, U"abcdefghijklmnopqrst", -10);
416     test(U"abcdefghijklmnopqrst", 5, 5, U"", 20);
417     test(U"abcdefghijklmnopqrst", 0, 8, U"abcde", 15);
418     test(U"abcdefghijklmnopqrst", 0, 12, U"abcdefghij", 10);
419     test(U"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), U"abcdefghijklmnopqrst", 0);
420     }
421 
422     {
423     test(u"", 0, 0, u"", 0);
424     test(u"", 0, 0, u"abcde", -5);
425     test(u"", 0, 0, u"abcdefghij", -10);
426     test(u"", 0, 0, u"abcdefghijklmnopqrst", -20);
427     test(u"abcde", 0, 2, u"", 5);
428     test(u"abcde", 0, 6, u"abcde", 0);
429     test(u"abcde", 0, 6, u"abcdefghij", -5);
430     test(u"abcde", 0, 6, u"abcdefghijklmnopqrst", -15);
431     test(u"abcdefghij", 3, 3, u"", 10);
432     test(u"abcdefghij", 3, 3, u"abcde", 5);
433     test(u"abcdefghij", 3, 3, u"def", 0);
434     test(u"abcdefghij", 0, 4, u"abcdefghijklmnopqrst", -10);
435     test(u"abcdefghijklmnopqrst", 5, 5, u"", 20);
436     test(u"abcdefghijklmnopqrst", 0, 8, u"abcde", 15);
437     test(u"abcdefghijklmnopqrst", 0, 12, u"abcdefghij", 10);
438     test(u"abcdefghijklmnopqrst", 0, static_cast<size_t>(-1), u"abcdefghijklmnopqrst", 0);
439     }
440 #endif
441 
442 #if TEST_STD_VER > 11
443     {
444     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
445     constexpr SV  sv1;
446     constexpr SV  sv2 { "abcde", 5 };
447     static_assert ( sv1.compare(0, 0, "") == 0, "" );
448     static_assert ( sv1.compare(0, 0, "abcde") == -1, "" );
449     static_assert ( sv2.compare(0, 2, "") == 1, "" );
450     static_assert ( sv2.compare(0, 6, "abcde") == 0, "" );
451     }
452 #endif
453 }
454