1 //===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/ADT/StringRef.h"
11 #include "llvm/ADT/Hashing.h"
12 #include "llvm/ADT/SmallVector.h"
13 #include "llvm/ADT/StringExtras.h"
14 #include "llvm/Support/Allocator.h"
15 #include "llvm/Support/raw_ostream.h"
16 #include "gtest/gtest.h"
17 using namespace llvm;
18 
19 namespace llvm {
20 
21 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
22   OS << S.str();
23   return OS;
24 }
25 
26 std::ostream &operator<<(std::ostream &OS,
27                          const std::pair<StringRef, StringRef> &P) {
28   OS << "(" << P.first << ", " << P.second << ")";
29   return OS;
30 }
31 
32 }
33 
34 namespace {
35 TEST(StringRefTest, Construction) {
36   EXPECT_EQ("", StringRef());
37   EXPECT_EQ("hello", StringRef("hello"));
38   EXPECT_EQ("hello", StringRef("hello world", 5));
39   EXPECT_EQ("hello", StringRef(std::string("hello")));
40 }
41 
42 TEST(StringRefTest, Iteration) {
43   StringRef S("hello");
44   const char *p = "hello";
45   for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
46     EXPECT_EQ(*it, *p);
47 }
48 
49 TEST(StringRefTest, StringOps) {
50   const char *p = "hello";
51   EXPECT_EQ(p, StringRef(p, 0).data());
52   EXPECT_TRUE(StringRef().empty());
53   EXPECT_EQ((size_t) 5, StringRef("hello").size());
54   EXPECT_EQ(-1, StringRef("aab").compare("aad"));
55   EXPECT_EQ( 0, StringRef("aab").compare("aab"));
56   EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
57   EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
58   EXPECT_EQ( 1, StringRef("aab").compare("aa"));
59   EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
60 
61   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aAd"));
62   EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
63   EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
64   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
65   EXPECT_EQ(-1, StringRef("AaB").compare_lower("bb"));
66   EXPECT_EQ( 1, StringRef("aaBb").compare_lower("AaB"));
67   EXPECT_EQ( 1, StringRef("bb").compare_lower("AaB"));
68   EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
69   EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\1"));
70 
71   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
72   EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
73   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
74   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
75   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
76   EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
77   EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
78   EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
79   EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
80   EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
81   EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
82   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
83   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
84   EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
85   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
86   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
87   EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
88 }
89 
90 TEST(StringRefTest, Operators) {
91   EXPECT_EQ("", StringRef());
92   EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
93   EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
94   EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
95   EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
96   EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
97   EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
98   EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
99   EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
100   EXPECT_EQ(StringRef("aab"), StringRef("aab"));
101   EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
102   EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
103   EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
104   EXPECT_EQ('a', StringRef("aab")[1]);
105 }
106 
107 TEST(StringRefTest, Substr) {
108   StringRef Str("hello");
109   EXPECT_EQ("lo", Str.substr(3));
110   EXPECT_EQ("", Str.substr(100));
111   EXPECT_EQ("hello", Str.substr(0, 100));
112   EXPECT_EQ("o", Str.substr(4, 10));
113 }
114 
115 TEST(StringRefTest, Slice) {
116   StringRef Str("hello");
117   EXPECT_EQ("l", Str.slice(2, 3));
118   EXPECT_EQ("ell", Str.slice(1, 4));
119   EXPECT_EQ("llo", Str.slice(2, 100));
120   EXPECT_EQ("", Str.slice(2, 1));
121   EXPECT_EQ("", Str.slice(10, 20));
122 }
123 
124 TEST(StringRefTest, Split) {
125   StringRef Str("hello");
126   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
127             Str.split('X'));
128   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
129             Str.split('e'));
130   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
131             Str.split('h'));
132   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
133             Str.split('l'));
134   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
135             Str.split('o'));
136 
137   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
138             Str.rsplit('X'));
139   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
140             Str.rsplit('e'));
141   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
142             Str.rsplit('h'));
143   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
144             Str.rsplit('l'));
145   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
146             Str.rsplit('o'));
147 }
148 
149 TEST(StringRefTest, Split2) {
150   SmallVector<StringRef, 5> parts;
151   SmallVector<StringRef, 5> expected;
152 
153   expected.push_back("ab"); expected.push_back("c");
154   StringRef(",ab,,c,").split(parts, ",", -1, false);
155   EXPECT_TRUE(parts == expected);
156 
157   expected.clear(); parts.clear();
158   expected.push_back(""); expected.push_back("ab"); expected.push_back("");
159   expected.push_back("c"); expected.push_back("");
160   StringRef(",ab,,c,").split(parts, ",", -1, true);
161   EXPECT_TRUE(parts == expected);
162 
163   expected.clear(); parts.clear();
164   expected.push_back("");
165   StringRef("").split(parts, ",", -1, true);
166   EXPECT_TRUE(parts == expected);
167 
168   expected.clear(); parts.clear();
169   StringRef("").split(parts, ",", -1, false);
170   EXPECT_TRUE(parts == expected);
171 
172   expected.clear(); parts.clear();
173   StringRef(",").split(parts, ",", -1, false);
174   EXPECT_TRUE(parts == expected);
175 
176   expected.clear(); parts.clear();
177   expected.push_back(""); expected.push_back("");
178   StringRef(",").split(parts, ",", -1, true);
179   EXPECT_TRUE(parts == expected);
180 
181   expected.clear(); parts.clear();
182   expected.push_back("a"); expected.push_back("b");
183   StringRef("a,b").split(parts, ",", -1, true);
184   EXPECT_TRUE(parts == expected);
185 
186   // Test MaxSplit
187   expected.clear(); parts.clear();
188   expected.push_back("a,,b,c");
189   StringRef("a,,b,c").split(parts, ",", 0, true);
190   EXPECT_TRUE(parts == expected);
191 
192   expected.clear(); parts.clear();
193   expected.push_back("a,,b,c");
194   StringRef("a,,b,c").split(parts, ",", 0, false);
195   EXPECT_TRUE(parts == expected);
196 
197   expected.clear(); parts.clear();
198   expected.push_back("a"); expected.push_back(",b,c");
199   StringRef("a,,b,c").split(parts, ",", 1, true);
200   EXPECT_TRUE(parts == expected);
201 
202   expected.clear(); parts.clear();
203   expected.push_back("a"); expected.push_back(",b,c");
204   StringRef("a,,b,c").split(parts, ",", 1, false);
205   EXPECT_TRUE(parts == expected);
206 
207   expected.clear(); parts.clear();
208   expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
209   StringRef("a,,b,c").split(parts, ",", 2, true);
210   EXPECT_TRUE(parts == expected);
211 
212   expected.clear(); parts.clear();
213   expected.push_back("a"); expected.push_back("b,c");
214   StringRef("a,,b,c").split(parts, ",", 2, false);
215   EXPECT_TRUE(parts == expected);
216 
217   expected.clear(); parts.clear();
218   expected.push_back("a"); expected.push_back(""); expected.push_back("b");
219   expected.push_back("c");
220   StringRef("a,,b,c").split(parts, ",", 3, true);
221   EXPECT_TRUE(parts == expected);
222 
223   expected.clear(); parts.clear();
224   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
225   StringRef("a,,b,c").split(parts, ",", 3, false);
226   EXPECT_TRUE(parts == expected);
227 }
228 
229 TEST(StringRefTest, Trim) {
230   StringRef Str0("hello");
231   StringRef Str1(" hello ");
232   StringRef Str2("  hello  ");
233 
234   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
235   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
236   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
237   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
238   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
239   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
240   EXPECT_EQ(StringRef("hello"), Str0.trim());
241   EXPECT_EQ(StringRef("hello"), Str1.trim());
242   EXPECT_EQ(StringRef("hello"), Str2.trim());
243 
244   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
245 
246   EXPECT_EQ(StringRef(""), StringRef("").trim());
247   EXPECT_EQ(StringRef(""), StringRef(" ").trim());
248   EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
249   EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
250   EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim(StringRef("\0", 1)));
251 }
252 
253 TEST(StringRefTest, StartsWith) {
254   StringRef Str("hello");
255   EXPECT_TRUE(Str.startswith(""));
256   EXPECT_TRUE(Str.startswith("he"));
257   EXPECT_FALSE(Str.startswith("helloworld"));
258   EXPECT_FALSE(Str.startswith("hi"));
259 }
260 
261 TEST(StringRefTest, StartsWithLower) {
262   StringRef Str("heLLo");
263   EXPECT_TRUE(Str.startswith_lower(""));
264   EXPECT_TRUE(Str.startswith_lower("he"));
265   EXPECT_TRUE(Str.startswith_lower("hell"));
266   EXPECT_TRUE(Str.startswith_lower("HELlo"));
267   EXPECT_FALSE(Str.startswith_lower("helloworld"));
268   EXPECT_FALSE(Str.startswith_lower("hi"));
269 }
270 
271 TEST(StringRefTest, EndsWith) {
272   StringRef Str("hello");
273   EXPECT_TRUE(Str.endswith(""));
274   EXPECT_TRUE(Str.endswith("lo"));
275   EXPECT_FALSE(Str.endswith("helloworld"));
276   EXPECT_FALSE(Str.endswith("worldhello"));
277   EXPECT_FALSE(Str.endswith("so"));
278 }
279 
280 TEST(StringRefTest, EndsWithLower) {
281   StringRef Str("heLLo");
282   EXPECT_TRUE(Str.endswith_lower(""));
283   EXPECT_TRUE(Str.endswith_lower("lo"));
284   EXPECT_TRUE(Str.endswith_lower("LO"));
285   EXPECT_TRUE(Str.endswith_lower("ELlo"));
286   EXPECT_FALSE(Str.endswith_lower("helloworld"));
287   EXPECT_FALSE(Str.endswith_lower("hi"));
288 }
289 
290 TEST(StringRefTest, Find) {
291   StringRef Str("hello");
292   EXPECT_EQ(2U, Str.find('l'));
293   EXPECT_EQ(StringRef::npos, Str.find('z'));
294   EXPECT_EQ(StringRef::npos, Str.find("helloworld"));
295   EXPECT_EQ(0U, Str.find("hello"));
296   EXPECT_EQ(1U, Str.find("ello"));
297   EXPECT_EQ(StringRef::npos, Str.find("zz"));
298   EXPECT_EQ(2U, Str.find("ll", 2));
299   EXPECT_EQ(StringRef::npos, Str.find("ll", 3));
300   EXPECT_EQ(0U, Str.find(""));
301   StringRef LongStr("hellx xello hell ello world foo bar hello");
302   EXPECT_EQ(36U, LongStr.find("hello"));
303   EXPECT_EQ(28U, LongStr.find("foo"));
304   EXPECT_EQ(12U, LongStr.find("hell", 2));
305   EXPECT_EQ(0U, LongStr.find(""));
306 
307   EXPECT_EQ(3U, Str.rfind('l'));
308   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
309   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
310   EXPECT_EQ(0U, Str.rfind("hello"));
311   EXPECT_EQ(1U, Str.rfind("ello"));
312   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
313 
314   EXPECT_EQ(2U, Str.find_first_of('l'));
315   EXPECT_EQ(1U, Str.find_first_of("el"));
316   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
317 
318   EXPECT_EQ(1U, Str.find_first_not_of('h'));
319   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
320   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
321 
322   EXPECT_EQ(3U, Str.find_last_not_of('o'));
323   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
324   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
325 }
326 
327 TEST(StringRefTest, Count) {
328   StringRef Str("hello");
329   EXPECT_EQ(2U, Str.count('l'));
330   EXPECT_EQ(1U, Str.count('o'));
331   EXPECT_EQ(0U, Str.count('z'));
332   EXPECT_EQ(0U, Str.count("helloworld"));
333   EXPECT_EQ(1U, Str.count("hello"));
334   EXPECT_EQ(1U, Str.count("ello"));
335   EXPECT_EQ(0U, Str.count("zz"));
336 }
337 
338 TEST(StringRefTest, EditDistance) {
339   StringRef Str("hello");
340   EXPECT_EQ(2U, Str.edit_distance("hill"));
341 }
342 
343 TEST(StringRefTest, Misc) {
344   std::string Storage;
345   raw_string_ostream OS(Storage);
346   OS << StringRef("hello");
347   EXPECT_EQ("hello", OS.str());
348 }
349 
350 TEST(StringRefTest, Hashing) {
351   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
352   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
353   std::string S = "hello world";
354   hash_code H = hash_value(S);
355   EXPECT_EQ(H, hash_value(StringRef("hello world")));
356   EXPECT_EQ(H, hash_value(StringRef(S)));
357   EXPECT_NE(H, hash_value(StringRef("hello worl")));
358   EXPECT_EQ(hash_value(std::string("hello worl")),
359             hash_value(StringRef("hello worl")));
360   EXPECT_NE(H, hash_value(StringRef("hello world ")));
361   EXPECT_EQ(hash_value(std::string("hello world ")),
362             hash_value(StringRef("hello world ")));
363   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
364   EXPECT_NE(hash_value(std::string("ello worl")),
365             hash_value(StringRef("hello world").slice(1, -1)));
366 }
367 
368 struct UnsignedPair {
369   const char *Str;
370   uint64_t Expected;
371 } Unsigned[] =
372   { {"0", 0}
373   , {"255", 255}
374   , {"256", 256}
375   , {"65535", 65535}
376   , {"65536", 65536}
377   , {"4294967295", 4294967295ULL}
378   , {"4294967296", 4294967296ULL}
379   , {"18446744073709551615", 18446744073709551615ULL}
380   , {"042", 34}
381   , {"0x42", 66}
382   , {"0b101010", 42}
383   };
384 
385 struct SignedPair {
386   const char *Str;
387   int64_t Expected;
388 } Signed[] =
389   { {"0", 0}
390   , {"-0", 0}
391   , {"127", 127}
392   , {"128", 128}
393   , {"-128", -128}
394   , {"-129", -129}
395   , {"32767", 32767}
396   , {"32768", 32768}
397   , {"-32768", -32768}
398   , {"-32769", -32769}
399   , {"2147483647", 2147483647LL}
400   , {"2147483648", 2147483648LL}
401   , {"-2147483648", -2147483648LL}
402   , {"-2147483649", -2147483649LL}
403   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
404   , {"042", 34}
405   , {"0x42", 66}
406   , {"0b101010", 42}
407   , {"-042", -34}
408   , {"-0x42", -66}
409   , {"-0b101010", -42}
410   };
411 
412 TEST(StringRefTest, getAsInteger) {
413   uint8_t U8;
414   uint16_t U16;
415   uint32_t U32;
416   uint64_t U64;
417 
418   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
419     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
420     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
421       ASSERT_FALSE(U8Success);
422       EXPECT_EQ(U8, Unsigned[i].Expected);
423     } else {
424       ASSERT_TRUE(U8Success);
425     }
426     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
427     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
428       ASSERT_FALSE(U16Success);
429       EXPECT_EQ(U16, Unsigned[i].Expected);
430     } else {
431       ASSERT_TRUE(U16Success);
432     }
433     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
434     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
435       ASSERT_FALSE(U32Success);
436       EXPECT_EQ(U32, Unsigned[i].Expected);
437     } else {
438       ASSERT_TRUE(U32Success);
439     }
440     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
441     if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
442       ASSERT_FALSE(U64Success);
443       EXPECT_EQ(U64, Unsigned[i].Expected);
444     } else {
445       ASSERT_TRUE(U64Success);
446     }
447   }
448 
449   int8_t S8;
450   int16_t S16;
451   int32_t S32;
452   int64_t S64;
453 
454   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
455     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
456     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
457       ASSERT_FALSE(S8Success);
458       EXPECT_EQ(S8, Signed[i].Expected);
459     } else {
460       ASSERT_TRUE(S8Success);
461     }
462     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
463     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
464       ASSERT_FALSE(S16Success);
465       EXPECT_EQ(S16, Signed[i].Expected);
466     } else {
467       ASSERT_TRUE(S16Success);
468     }
469     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
470     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
471       ASSERT_FALSE(S32Success);
472       EXPECT_EQ(S32, Signed[i].Expected);
473     } else {
474       ASSERT_TRUE(S32Success);
475     }
476     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
477     if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
478       ASSERT_FALSE(S64Success);
479       EXPECT_EQ(S64, Signed[i].Expected);
480     } else {
481       ASSERT_TRUE(S64Success);
482     }
483   }
484 }
485 
486 
487 static const char* BadStrings[] = {
488     "18446744073709551617"  // value just over max
489   , "123456789012345678901" // value way too large
490   , "4t23v"                 // illegal decimal characters
491   , "0x123W56"              // illegal hex characters
492   , "0b2"                   // illegal bin characters
493   , "08"                    // illegal oct characters
494   , "0o8"                   // illegal oct characters
495   , "-123"                  // negative unsigned value
496 };
497 
498 
499 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
500   unsigned long long U64;
501   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
502     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
503     ASSERT_TRUE(IsBadNumber);
504   }
505 }
506 
507 static const char *join_input[] = { "a", "b", "c" };
508 static const char join_result1[] = "a";
509 static const char join_result2[] = "a:b:c";
510 static const char join_result3[] = "a::b::c";
511 
512 TEST(StringRefTest, joinStrings) {
513   std::vector<StringRef> v1;
514   std::vector<std::string> v2;
515   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
516     v1.push_back(join_input[i]);
517     v2.push_back(join_input[i]);
518   }
519 
520   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
521   EXPECT_TRUE(v1_join1);
522   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
523   EXPECT_TRUE(v1_join2);
524   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
525   EXPECT_TRUE(v1_join3);
526 
527   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
528   EXPECT_TRUE(v2_join1);
529   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
530   EXPECT_TRUE(v2_join2);
531   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
532   EXPECT_TRUE(v2_join3);
533 }
534 
535 
536 TEST(StringRefTest, AllocatorCopy) {
537   BumpPtrAllocator Alloc;
538   StringRef Str1 = "hello";
539   StringRef Str2 = "bye";
540   StringRef Str1c = Str1.copy(Alloc);
541   StringRef Str2c = Str2.copy(Alloc);
542   EXPECT_TRUE(Str1.equals(Str1c));
543   EXPECT_NE(Str1.data(), Str1c.data());
544   EXPECT_TRUE(Str2.equals(Str2c));
545   EXPECT_NE(Str2.data(), Str2c.data());
546 }
547 
548 
549 } // end anonymous namespace
550