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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // Copied from strings/stringpiece.h with modifications | 4 // Copied from strings/stringpiece.h with modifications |
5 // | 5 // |
6 // A string-like object that points to a sized piece of memory. | 6 // A string-like object that points to a sized piece of memory. |
7 // | 7 // |
8 // Functions or methods may use const StringPiece& parameters to accept either | 8 // Functions or methods may use const StringPiece& parameters to accept either |
9 // a "const char*" or a "string" value that will be implicitly converted to | 9 // a "const char*" or a "string" value that will be implicitly converted to |
10 // a StringPiece. The implicit conversion means that it is often appropriate | 10 // a StringPiece. The implicit conversion means that it is often appropriate |
11 // to include this .h file in other files rather than forward-declaring | 11 // to include this .h file in other files rather than forward-declaring |
12 // StringPiece as would be appropriate for most other Google classes. | 12 // StringPiece as would be appropriate for most other Google classes. |
13 // | 13 // |
14 // Systematic usage of StringPiece is encouraged as it will reduce unnecessary | 14 // Systematic usage of StringPiece is encouraged as it will reduce unnecessary |
15 // conversions from "const char*" to "string" and back again. | 15 // conversions from "const char*" to "string" and back again. |
16 // | 16 // |
17 // StringPiece16 is similar to StringPiece but for base::string16 instead of | 17 // StringPiece16 is similar to StringPiece but for base::string16 instead of |
18 // std::string. We do not define as large of a subset of the STL functions | 18 // std::string. We do not define as large of a subset of the STL functions |
19 // from basic_string as in StringPiece, but this can be changed if these | 19 // from basic_string as in StringPiece, but this can be changed if these |
20 // functions (find, find_first_of, etc.) are found to be useful in this context. | 20 // functions (find, find_first_of, etc.) are found to be useful in this context. |
21 // | 21 // |
22 | 22 |
23 #ifndef BASE_STRING_PIECE_H_ | 23 #ifndef BASE_STRING_PIECE_H_ |
24 #define BASE_STRING_PIECE_H_ | 24 #define BASE_STRING_PIECE_H_ |
25 #pragma once | 25 #pragma once |
26 | 26 |
| 27 #include <iosfwd> |
27 #include <string> | 28 #include <string> |
28 | 29 |
29 #include "base/base_export.h" | 30 #include "base/base_export.h" |
30 #include "base/basictypes.h" | 31 #include "base/basictypes.h" |
31 #include "base/hash_tables.h" | 32 #include "base/hash_tables.h" |
32 #include "base/string16.h" | 33 #include "base/string16.h" |
33 | 34 |
34 namespace base { | 35 namespace base { |
35 | 36 |
36 template <typename STRING_TYPE> class BasicStringPiece; | 37 template <typename STRING_TYPE> class BasicStringPiece; |
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392 } | 393 } |
393 | 394 |
394 inline bool operator<=(const StringPiece16& x, const StringPiece16& y) { | 395 inline bool operator<=(const StringPiece16& x, const StringPiece16& y) { |
395 return !(x > y); | 396 return !(x > y); |
396 } | 397 } |
397 | 398 |
398 inline bool operator>=(const StringPiece16& x, const StringPiece16& y) { | 399 inline bool operator>=(const StringPiece16& x, const StringPiece16& y) { |
399 return !(x < y); | 400 return !(x < y); |
400 } | 401 } |
401 | 402 |
| 403 BASE_EXPORT std::ostream& operator<<(std::ostream& o, |
| 404 const StringPiece& piece); |
| 405 |
402 } // namespace base | 406 } // namespace base |
403 | 407 |
404 // We provide appropriate hash functions so StringPiece and StringPiece16 can | 408 // We provide appropriate hash functions so StringPiece and StringPiece16 can |
405 // be used as keys in hash sets and maps. | 409 // be used as keys in hash sets and maps. |
406 | 410 |
407 // This hash function is copied from base/hash_tables.h. We don't use the | 411 // This hash function is copied from base/hash_tables.h. We don't use the |
408 // ones already defined for string and string16 directly because it would | 412 // ones already defined for string and string16 directly because it would |
409 // require the string constructors to be called, which we don't want. | 413 // require the string constructors to be called, which we don't want. |
410 #define HASH_STRING_PIECE(StringPieceType, string_piece) \ | 414 #define HASH_STRING_PIECE(StringPieceType, string_piece) \ |
411 std::size_t result = 0; \ | 415 std::size_t result = 0; \ |
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437 } | 441 } |
438 inline size_t hash_value(const base::StringPiece16& sp16) { | 442 inline size_t hash_value(const base::StringPiece16& sp16) { |
439 HASH_STRING_PIECE(base::StringPiece16, sp16); | 443 HASH_STRING_PIECE(base::StringPiece16, sp16); |
440 } | 444 } |
441 | 445 |
442 #endif // COMPILER | 446 #endif // COMPILER |
443 | 447 |
444 } // namespace BASE_HASH_NAMESPACE | 448 } // namespace BASE_HASH_NAMESPACE |
445 | 449 |
446 #endif // BASE_STRING_PIECE_H_ | 450 #endif // BASE_STRING_PIECE_H_ |
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