libcxx/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp

   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
  20 int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
  21
  22 template<typename CharT>
  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>
  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
  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
 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
 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
 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 }