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The C and C++ Include Header Files
/usr/include/c++/13/bits/streambuf_iterator.h
$ cat -n /usr/include/c++/13/bits/streambuf_iterator.h 1 // Streambuf iterators 2 3 // Copyright (C) 1997-2023 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/streambuf_iterator.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{iterator} 28 */ 29 30 #ifndef _STREAMBUF_ITERATOR_H 31 #define _STREAMBUF_ITERATOR_H 1 32 33 #pragma GCC system_header 34 35 #include <streambuf> 36 #include <bits/stl_iterator_base_types.h> 37 #include <debug/debug.h> 38 39 namespace std _GLIBCXX_VISIBILITY(default) 40 { 41 _GLIBCXX_BEGIN_NAMESPACE_VERSION 42 43 /** 44 * @addtogroup iterators 45 * @{ 46 */ 47 48 // Ignore warnings about std::iterator. 49 #pragma GCC diagnostic push 50 #pragma GCC diagnostic ignored "-Wdeprecated-declarations" 51 // 24.5.3 Template class istreambuf_iterator 52 /// Provides input iterator semantics for streambufs. 53 template<typename _CharT, typename _Traits> 54 class istreambuf_iterator 55 : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, 56 _CharT*, _CharT> 57 { 58 public: 59 // Types: 60 ///@{ 61 /// Public typedefs 62 #if __cplusplus < 201103L 63 typedef _CharT& reference; // Changed to _CharT by LWG 445 64 #elif __cplusplus > 201703L 65 // _GLIBCXX_RESOLVE_LIB_DEFECTS 66 // 3188. istreambuf_iterator::pointer should not be unspecified 67 using pointer = void; 68 #endif 69 70 typedef _CharT char_type; 71 typedef _Traits traits_type; 72 typedef typename _Traits::int_type int_type; 73 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 74 typedef basic_istream<_CharT, _Traits> istream_type; 75 ///@} 76 77 template<typename _CharT2> 78 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 79 ostreambuf_iterator<_CharT2> >::__type 80 copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, 81 ostreambuf_iterator<_CharT2>); 82 83 template<bool _IsMove, typename _CharT2> 84 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 85 _CharT2*>::__type 86 __copy_move_a2(istreambuf_iterator<_CharT2>, 87 istreambuf_iterator<_CharT2>, _CharT2*); 88 89 template<typename _CharT2, typename _Size> 90 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 91 _CharT2*>::__type 92 __copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool); 93 94 template<typename _CharT2> 95 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 96 istreambuf_iterator<_CharT2> >::__type 97 find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, 98 const _CharT2&); 99 100 template<typename _CharT2, typename _Distance> 101 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 102 void>::__type 103 advance(istreambuf_iterator<_CharT2>&, _Distance); 104 105 private: 106 // 24.5.3 istreambuf_iterator 107 // p 1 108 // If the end of stream is reached (streambuf_type::sgetc() 109 // returns traits_type::eof()), the iterator becomes equal to 110 // the "end of stream" iterator value. 111 // NB: This implementation assumes the "end of stream" value 112 // is EOF, or -1. 113 mutable streambuf_type* _M_sbuf; 114 int_type _M_c; 115 116 public: 117 /// Construct end of input stream iterator. 118 _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT 119 : _M_sbuf(0), _M_c(traits_type::eof()) { } 120 121 #if __cplusplus > 201703L && __cpp_lib_concepts 122 constexpr istreambuf_iterator(default_sentinel_t) noexcept 123 : istreambuf_iterator() { } 124 #endif 125 126 #if __cplusplus >= 201103L 127 istreambuf_iterator(const istreambuf_iterator&) noexcept = default; 128 129 ~istreambuf_iterator() = default; 130 #endif 131 132 /// Construct start of input stream iterator. 133 istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT 134 : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } 135 136 /// Construct start of streambuf iterator. 137 istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT 138 : _M_sbuf(__s), _M_c(traits_type::eof()) { } 139 140 #if __cplusplus >= 201103L 141 istreambuf_iterator& 142 operator=(const istreambuf_iterator&) noexcept = default; 143 #endif 144 145 /// Return the current character pointed to by iterator. This returns 146 /// streambuf.sgetc(). It cannot be assigned. NB: The result of 147 /// operator*() on an end of stream is undefined. 148 _GLIBCXX_NODISCARD 149 char_type 150 operator*() const 151 { 152 int_type __c = _M_get(); 153 154 #ifdef _GLIBCXX_DEBUG_PEDANTIC 155 // Dereferencing a past-the-end istreambuf_iterator is a 156 // libstdc++ extension 157 __glibcxx_requires_cond(!_S_is_eof(__c), 158 _M_message(__gnu_debug::__msg_deref_istreambuf) 159 ._M_iterator(*this)); 160 #endif 161 return traits_type::to_char_type(__c); 162 } 163 164 /// Advance the iterator. Calls streambuf.sbumpc(). 165 istreambuf_iterator& 166 operator++() 167 { 168 __glibcxx_requires_cond(_M_sbuf && 169 (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), 170 _M_message(__gnu_debug::__msg_inc_istreambuf) 171 ._M_iterator(*this)); 172 173 _M_sbuf->sbumpc(); 174 _M_c = traits_type::eof(); 175 return *this; 176 } 177 178 /// Advance the iterator. Calls streambuf.sbumpc(). 179 istreambuf_iterator 180 operator++(int) 181 { 182 __glibcxx_requires_cond(_M_sbuf && 183 (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), 184 _M_message(__gnu_debug::__msg_inc_istreambuf) 185 ._M_iterator(*this)); 186 187 istreambuf_iterator __old = *this; 188 __old._M_c = _M_sbuf->sbumpc(); 189 _M_c = traits_type::eof(); 190 return __old; 191 } 192 193 // _GLIBCXX_RESOLVE_LIB_DEFECTS 194 // 110 istreambuf_iterator::equal not const 195 // NB: there is also number 111 (NAD) relevant to this function. 196 /// Return true both iterators are end or both are not end. 197 _GLIBCXX_NODISCARD 198 bool 199 equal(const istreambuf_iterator& __b) const 200 { return _M_at_eof() == __b._M_at_eof(); } 201 202 private: 203 int_type 204 _M_get() const 205 { 206 int_type __ret = _M_c; 207 if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc())) 208 _M_sbuf = 0; 209 return __ret; 210 } 211 212 bool 213 _M_at_eof() const 214 { return _S_is_eof(_M_get()); } 215 216 static bool 217 _S_is_eof(int_type __c) 218 { 219 const int_type __eof = traits_type::eof(); 220 return traits_type::eq_int_type(__c, __eof); 221 } 222 223 #if __cplusplus > 201703L && __cpp_lib_concepts 224 [[nodiscard]] 225 friend bool 226 operator==(const istreambuf_iterator& __i, default_sentinel_t) 227 { return __i._M_at_eof(); } 228 #endif 229 }; 230 231 template<typename _CharT, typename _Traits> 232 _GLIBCXX_NODISCARD 233 inline bool 234 operator==(const istreambuf_iterator<_CharT, _Traits>& __a, 235 const istreambuf_iterator<_CharT, _Traits>& __b) 236 { return __a.equal(__b); } 237 238 #if __cpp_impl_three_way_comparison < 201907L 239 template<typename _CharT, typename _Traits> 240 _GLIBCXX_NODISCARD 241 inline bool 242 operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, 243 const istreambuf_iterator<_CharT, _Traits>& __b) 244 { return !__a.equal(__b); } 245 #endif 246 247 /// Provides output iterator semantics for streambufs. 248 template<typename _CharT, typename _Traits> 249 class ostreambuf_iterator 250 : public iterator<output_iterator_tag, void, void, void, void> 251 { 252 public: 253 // Types: 254 ///@{ 255 /// Public typedefs 256 #if __cplusplus > 201703L 257 using difference_type = ptrdiff_t; 258 #endif 259 typedef _CharT char_type; 260 typedef _Traits traits_type; 261 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 262 typedef basic_ostream<_CharT, _Traits> ostream_type; 263 ///@} 264 265 template<typename _CharT2> 266 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 267 ostreambuf_iterator<_CharT2> >::__type 268 copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, 269 ostreambuf_iterator<_CharT2>); 270 271 private: 272 streambuf_type* _M_sbuf; 273 bool _M_failed; 274 275 public: 276 277 #if __cplusplus > 201703L 278 constexpr 279 ostreambuf_iterator() noexcept 280 : _M_sbuf(nullptr), _M_failed(true) { } 281 #endif 282 283 /// Construct output iterator from ostream. 284 ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT 285 : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } 286 287 /// Construct output iterator from streambuf. 288 ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT 289 : _M_sbuf(__s), _M_failed(!_M_sbuf) { } 290 291 /// Write character to streambuf. Calls streambuf.sputc(). 292 ostreambuf_iterator& 293 operator=(_CharT __c) 294 { 295 if (!_M_failed && 296 _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) 297 _M_failed = true; 298 return *this; 299 } 300 301 /// Return *this. 302 _GLIBCXX_NODISCARD 303 ostreambuf_iterator& 304 operator*() 305 { return *this; } 306 307 /// Return *this. 308 ostreambuf_iterator& 309 operator++(int) 310 { return *this; } 311 312 /// Return *this. 313 ostreambuf_iterator& 314 operator++() 315 { return *this; } 316 317 /// Return true if previous operator=() failed. 318 _GLIBCXX_NODISCARD 319 bool 320 failed() const _GLIBCXX_USE_NOEXCEPT 321 { return _M_failed; } 322 323 ostreambuf_iterator& 324 _M_put(const _CharT* __ws, streamsize __len) 325 { 326 if (__builtin_expect(!_M_failed, true) 327 && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, 328 false)) 329 _M_failed = true; 330 return *this; 331 } 332 }; 333 #pragma GCC diagnostic pop 334 335 // Overloads for streambuf iterators. 336 template<typename _CharT> 337 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 338 ostreambuf_iterator<_CharT> >::__type 339 copy(istreambuf_iterator<_CharT> __first, 340 istreambuf_iterator<_CharT> __last, 341 ostreambuf_iterator<_CharT> __result) 342 { 343 if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) 344 { 345 bool __ineof; 346 __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); 347 if (!__ineof) 348 __result._M_failed = true; 349 } 350 return __result; 351 } 352 353 template<bool _IsMove, typename _CharT> 354 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 355 ostreambuf_iterator<_CharT> >::__type 356 __copy_move_a2(_CharT* __first, _CharT* __last, 357 ostreambuf_iterator<_CharT> __result) 358 { 359 const streamsize __num = __last - __first; 360 if (__num > 0) 361 __result._M_put(__first, __num); 362 return __result; 363 } 364 365 template<bool _IsMove, typename _CharT> 366 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 367 ostreambuf_iterator<_CharT> >::__type 368 __copy_move_a2(const _CharT* __first, const _CharT* __last, 369 ostreambuf_iterator<_CharT> __result) 370 { 371 const streamsize __num = __last - __first; 372 if (__num > 0) 373 __result._M_put(__first, __num); 374 return __result; 375 } 376 377 template<bool _IsMove, typename _CharT> 378 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 379 _CharT*>::__type 380 __copy_move_a2(istreambuf_iterator<_CharT> __first, 381 istreambuf_iterator<_CharT> __last, _CharT* __result) 382 { 383 typedef istreambuf_iterator<_CharT> __is_iterator_type; 384 typedef typename __is_iterator_type::traits_type traits_type; 385 typedef typename __is_iterator_type::streambuf_type streambuf_type; 386 typedef typename traits_type::int_type int_type; 387 388 if (__first._M_sbuf && !__last._M_sbuf) 389 { 390 streambuf_type* __sb = __first._M_sbuf; 391 int_type __c = __sb->sgetc(); 392 while (!traits_type::eq_int_type(__c, traits_type::eof())) 393 { 394 const streamsize __n = __sb->egptr() - __sb->gptr(); 395 if (__n > 1) 396 { 397 traits_type::copy(__result, __sb->gptr(), __n); 398 __sb->__safe_gbump(__n); 399 __result += __n; 400 __c = __sb->underflow(); 401 } 402 else 403 { 404 *__result++ = traits_type::to_char_type(__c); 405 __c = __sb->snextc(); 406 } 407 } 408 } 409 return __result; 410 } 411 412 template<typename _CharT, typename _Size> 413 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 414 _CharT*>::__type 415 __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result, 416 bool __strict __attribute__((__unused__))) 417 { 418 if (__n == 0) 419 return __result; 420 421 __glibcxx_requires_cond(__it._M_sbuf, 422 _M_message(__gnu_debug::__msg_inc_istreambuf) 423 ._M_iterator(__it)); 424 _CharT* __beg = __result; 425 __result += __it._M_sbuf->sgetn(__beg, __n); 426 __glibcxx_requires_cond(!__strict || __result - __beg == __n, 427 _M_message(__gnu_debug::__msg_inc_istreambuf) 428 ._M_iterator(__it)); 429 return __result; 430 } 431 432 template<typename _CharT> 433 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 434 istreambuf_iterator<_CharT> >::__type 435 find(istreambuf_iterator<_CharT> __first, 436 istreambuf_iterator<_CharT> __last, const _CharT& __val) 437 { 438 typedef istreambuf_iterator<_CharT> __is_iterator_type; 439 typedef typename __is_iterator_type::traits_type traits_type; 440 typedef typename __is_iterator_type::streambuf_type streambuf_type; 441 typedef typename traits_type::int_type int_type; 442 const int_type __eof = traits_type::eof(); 443 444 if (__first._M_sbuf && !__last._M_sbuf) 445 { 446 const int_type __ival = traits_type::to_int_type(__val); 447 streambuf_type* __sb = __first._M_sbuf; 448 int_type __c = __sb->sgetc(); 449 while (!traits_type::eq_int_type(__c, __eof) 450 && !traits_type::eq_int_type(__c, __ival)) 451 { 452 streamsize __n = __sb->egptr() - __sb->gptr(); 453 if (__n > 1) 454 { 455 const _CharT* __p = traits_type::find(__sb->gptr(), 456 __n, __val); 457 if (__p) 458 __n = __p - __sb->gptr(); 459 __sb->__safe_gbump(__n); 460 __c = __sb->sgetc(); 461 } 462 else 463 __c = __sb->snextc(); 464 } 465 466 __first._M_c = __eof; 467 } 468 469 return __first; 470 } 471 472 template<typename _CharT, typename _Distance> 473 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 474 void>::__type 475 advance(istreambuf_iterator<_CharT>& __i, _Distance __n) 476 { 477 if (__n == 0) 478 return; 479 480 __glibcxx_assert(__n > 0); 481 __glibcxx_requires_cond(!__i._M_at_eof(), 482 _M_message(__gnu_debug::__msg_inc_istreambuf) 483 ._M_iterator(__i)); 484 485 typedef istreambuf_iterator<_CharT> __is_iterator_type; 486 typedef typename __is_iterator_type::traits_type traits_type; 487 typedef typename __is_iterator_type::streambuf_type streambuf_type; 488 typedef typename traits_type::int_type int_type; 489 const int_type __eof = traits_type::eof(); 490 491 streambuf_type* __sb = __i._M_sbuf; 492 while (__n > 0) 493 { 494 streamsize __size = __sb->egptr() - __sb->gptr(); 495 if (__size > __n) 496 { 497 __sb->__safe_gbump(__n); 498 break; 499 } 500 501 __sb->__safe_gbump(__size); 502 __n -= __size; 503 if (traits_type::eq_int_type(__sb->underflow(), __eof)) 504 { 505 __glibcxx_requires_cond(__n == 0, 506 _M_message(__gnu_debug::__msg_inc_istreambuf) 507 ._M_iterator(__i)); 508 break; 509 } 510 } 511 512 __i._M_c = __eof; 513 } 514 515 /// @} group iterators 516 517 _GLIBCXX_END_NAMESPACE_VERSION 518 } // namespace 519 520 #endif
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