1 // Standard stream manipulators -*- C++ -*- 2 3 // Copyright (C) 1997-2014 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 include/iomanip 26 * This is a Standard C++ Library header. 27 */ 28 29 // 30 // ISO C++ 14882: 27.6.3 Standard manipulators 31 // 32 33 #ifndef _GLIBCXX_IOMANIP 34 #define _GLIBCXX_IOMANIP 1 35 36 #pragma GCC system_header 37 38 #include <bits/c++config.h> 39 #include <iosfwd> 40 #include <bits/ios_base.h> 41 42 #if __cplusplus >= 201103L 43 #include <locale> 44 #if __cplusplus > 201103L 45 #include <sstream> // used in quoted. 46 #endif 47 #endif 48 49 namespace std _GLIBCXX_VISIBILITY(default) 50 { 51 _GLIBCXX_BEGIN_NAMESPACE_VERSION 52 53 // [27.6.3] standard manipulators 54 // Also see DR 183. 55 56 struct _Resetiosflags { ios_base::fmtflags _M_mask; }; 57 58 /** 59 * @brief Manipulator for @c setf. 60 * @param __mask A format flags mask. 61 * 62 * Sent to a stream object, this manipulator resets the specified flags, 63 * via @e stream.setf(0,__mask). 64 */ 65 inline _Resetiosflags 66 resetiosflags(ios_base::fmtflags __mask) 67 { return { __mask }; } 68 69 template<typename _CharT, typename _Traits> 70 inline basic_istream<_CharT, _Traits>& 71 operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f) 72 { 73 __is.setf(ios_base::fmtflags(0), __f._M_mask); 74 return __is; 75 } 76 77 template<typename _CharT, typename _Traits> 78 inline basic_ostream<_CharT, _Traits>& 79 operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f) 80 { 81 __os.setf(ios_base::fmtflags(0), __f._M_mask); 82 return __os; 83 } 84 85 86 struct _Setiosflags { ios_base::fmtflags _M_mask; }; 87 88 /** 89 * @brief Manipulator for @c setf. 90 * @param __mask A format flags mask. 91 * 92 * Sent to a stream object, this manipulator sets the format flags 93 * to @a __mask. 94 */ 95 inline _Setiosflags 96 setiosflags(ios_base::fmtflags __mask) 97 { return { __mask }; } 98 99 template<typename _CharT, typename _Traits> 100 inline basic_istream<_CharT, _Traits>& 101 operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f) 102 { 103 __is.setf(__f._M_mask); 104 return __is; 105 } 106 107 template<typename _CharT, typename _Traits> 108 inline basic_ostream<_CharT, _Traits>& 109 operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f) 110 { 111 __os.setf(__f._M_mask); 112 return __os; 113 } 114 115 116 struct _Setbase { int _M_base; }; 117 118 /** 119 * @brief Manipulator for @c setf. 120 * @param __base A numeric base. 121 * 122 * Sent to a stream object, this manipulator changes the 123 * @c ios_base::basefield flags to @c oct, @c dec, or @c hex when @a base 124 * is 8, 10, or 16, accordingly, and to 0 if @a __base is any other value. 125 */ 126 inline _Setbase 127 setbase(int __base) 128 { return { __base }; } 129 130 template<typename _CharT, typename _Traits> 131 inline basic_istream<_CharT, _Traits>& 132 operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f) 133 { 134 __is.setf(__f._M_base == 8 ? ios_base::oct : 135 __f._M_base == 10 ? ios_base::dec : 136 __f._M_base == 16 ? ios_base::hex : 137 ios_base::fmtflags(0), ios_base::basefield); 138 return __is; 139 } 140 141 template<typename _CharT, typename _Traits> 142 inline basic_ostream<_CharT, _Traits>& 143 operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f) 144 { 145 __os.setf(__f._M_base == 8 ? ios_base::oct : 146 __f._M_base == 10 ? ios_base::dec : 147 __f._M_base == 16 ? ios_base::hex : 148 ios_base::fmtflags(0), ios_base::basefield); 149 return __os; 150 } 151 152 153 template<typename _CharT> 154 struct _Setfill { _CharT _M_c; }; 155 156 /** 157 * @brief Manipulator for @c fill. 158 * @param __c The new fill character. 159 * 160 * Sent to a stream object, this manipulator calls @c fill(__c) for that 161 * object. 162 */ 163 template<typename _CharT> 164 inline _Setfill<_CharT> 165 setfill(_CharT __c) 166 { return { __c }; } 167 168 template<typename _CharT, typename _Traits> 169 inline basic_istream<_CharT, _Traits>& 170 operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f) 171 { 172 __is.fill(__f._M_c); 173 return __is; 174 } 175 176 template<typename _CharT, typename _Traits> 177 inline basic_ostream<_CharT, _Traits>& 178 operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f) 179 { 180 __os.fill(__f._M_c); 181 return __os; 182 } 183 184 185 struct _Setprecision { int _M_n; }; 186 187 /** 188 * @brief Manipulator for @c precision. 189 * @param __n The new precision. 190 * 191 * Sent to a stream object, this manipulator calls @c precision(__n) for 192 * that object. 193 */ 194 inline _Setprecision 195 setprecision(int __n) 196 { return { __n }; } 197 198 template<typename _CharT, typename _Traits> 199 inline basic_istream<_CharT, _Traits>& 200 operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f) 201 { 202 __is.precision(__f._M_n); 203 return __is; 204 } 205 206 template<typename _CharT, typename _Traits> 207 inline basic_ostream<_CharT, _Traits>& 208 operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f) 209 { 210 __os.precision(__f._M_n); 211 return __os; 212 } 213 214 215 struct _Setw { int _M_n; }; 216 217 /** 218 * @brief Manipulator for @c width. 219 * @param __n The new width. 220 * 221 * Sent to a stream object, this manipulator calls @c width(__n) for 222 * that object. 223 */ 224 inline _Setw 225 setw(int __n) 226 { return { __n }; } 227 228 template<typename _CharT, typename _Traits> 229 inline basic_istream<_CharT, _Traits>& 230 operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f) 231 { 232 __is.width(__f._M_n); 233 return __is; 234 } 235 236 template<typename _CharT, typename _Traits> 237 inline basic_ostream<_CharT, _Traits>& 238 operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f) 239 { 240 __os.width(__f._M_n); 241 return __os; 242 } 243 244 #if __cplusplus >= 201103L 245 246 template<typename _MoneyT> 247 struct _Get_money { _MoneyT& _M_mon; bool _M_intl; }; 248 249 /** 250 * @brief Extended manipulator for extracting money. 251 * @param __mon Either long double or a specialization of @c basic_string. 252 * @param __intl A bool indicating whether international format 253 * is to be used. 254 * 255 * Sent to a stream object, this manipulator extracts @a __mon. 256 */ 257 template<typename _MoneyT> 258 inline _Get_money<_MoneyT> 259 get_money(_MoneyT& __mon, bool __intl = false) 260 { return { __mon, __intl }; } 261 262 template<typename _CharT, typename _Traits, typename _MoneyT> 263 basic_istream<_CharT, _Traits>& 264 operator>>(basic_istream<_CharT, _Traits>& __is, _Get_money<_MoneyT> __f) 265 { 266 typename basic_istream<_CharT, _Traits>::sentry __cerb(__is, false); 267 if (__cerb) 268 { 269 ios_base::iostate __err = ios_base::goodbit; 270 __try 271 { 272 typedef istreambuf_iterator<_CharT, _Traits> _Iter; 273 typedef money_get<_CharT, _Iter> _MoneyGet; 274 275 const _MoneyGet& __mg = use_facet<_MoneyGet>(__is.getloc()); 276 __mg.get(_Iter(__is.rdbuf()), _Iter(), __f._M_intl, 277 __is, __err, __f._M_mon); 278 } 279 __catch(__cxxabiv1::__forced_unwind&) 280 { 281 __is._M_setstate(ios_base::badbit); 282 __throw_exception_again; 283 } 284 __catch(...) 285 { __is._M_setstate(ios_base::badbit); } 286 if (__err) 287 __is.setstate(__err); 288 } 289 return __is; 290 } 291 292 293 template<typename _MoneyT> 294 struct _Put_money { const _MoneyT& _M_mon; bool _M_intl; }; 295 296 /** 297 * @brief Extended manipulator for inserting money. 298 * @param __mon Either long double or a specialization of @c basic_string. 299 * @param __intl A bool indicating whether international format 300 * is to be used. 301 * 302 * Sent to a stream object, this manipulator inserts @a __mon. 303 */ 304 template<typename _MoneyT> 305 inline _Put_money<_MoneyT> 306 put_money(const _MoneyT& __mon, bool __intl = false) 307 { return { __mon, __intl }; } 308 309 template<typename _CharT, typename _Traits, typename _MoneyT> 310 basic_ostream<_CharT, _Traits>& 311 operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f) 312 { 313 typename basic_ostream<_CharT, _Traits>::sentry __cerb(__os); 314 if (__cerb) 315 { 316 ios_base::iostate __err = ios_base::goodbit; 317 __try 318 { 319 typedef ostreambuf_iterator<_CharT, _Traits> _Iter; 320 typedef money_put<_CharT, _Iter> _MoneyPut; 321 322 const _MoneyPut& __mp = use_facet<_MoneyPut>(__os.getloc()); 323 if (__mp.put(_Iter(__os.rdbuf()), __f._M_intl, __os, 324 __os.fill(), __f._M_mon).failed()) 325 __err |= ios_base::badbit; 326 } 327 __catch(__cxxabiv1::__forced_unwind&) 328 { 329 __os._M_setstate(ios_base::badbit); 330 __throw_exception_again; 331 } 332 __catch(...) 333 { __os._M_setstate(ios_base::badbit); } 334 if (__err) 335 __os.setstate(__err); 336 } 337 return __os; 338 } 339 340 #if __cplusplus > 201103L 341 342 _GLIBCXX_END_NAMESPACE_VERSION 343 namespace __detail { 344 _GLIBCXX_BEGIN_NAMESPACE_VERSION 345 346 /** 347 * @brief Struct for delimited strings. 348 */ 349 template<typename _String, typename _CharT> 350 struct _Quoted_string 351 { 352 static_assert(is_reference<_String>::value 353 || is_pointer<_String>::value, 354 "String type must be pointer or reference"); 355 356 _Quoted_string(_String __str, _CharT __del, _CharT __esc) 357 : _M_string(__str), _M_delim{__del}, _M_escape{__esc} 358 { } 359 360 _Quoted_string& 361 operator=(_Quoted_string&) = delete; 362 363 _String _M_string; 364 _CharT _M_delim; 365 _CharT _M_escape; 366 }; 367 368 /** 369 * @brief Inserter for quoted strings. 370 * 371 * _GLIBCXX_RESOLVE_LIB_DEFECTS 372 * DR 2344 quoted()'s interaction with padding is unclear 373 */ 374 template<typename _CharT, typename _Traits> 375 auto& 376 operator<<(std::basic_ostream<_CharT, _Traits>& __os, 377 const _Quoted_string<const _CharT*, _CharT>& __str) 378 { 379 std::basic_ostringstream<_CharT, _Traits> __ostr; 380 __ostr << __str._M_delim; 381 for (const _CharT* __c = __str._M_string; *__c; ++__c) 382 { 383 if (*__c == __str._M_delim || *__c == __str._M_escape) 384 __ostr << __str._M_escape; 385 __ostr << *__c; 386 } 387 __ostr << __str._M_delim; 388 389 return __os << __ostr.str(); 390 } 391 392 /** 393 * @brief Inserter for quoted strings. 394 * 395 * _GLIBCXX_RESOLVE_LIB_DEFECTS 396 * DR 2344 quoted()'s interaction with padding is unclear 397 */ 398 template<typename _CharT, typename _Traits, typename _String> 399 auto& 400 operator<<(std::basic_ostream<_CharT, _Traits>& __os, 401 const _Quoted_string<_String, _CharT>& __str) 402 { 403 std::basic_ostringstream<_CharT, _Traits> __ostr; 404 __ostr << __str._M_delim; 405 for (auto& __c : __str._M_string) 406 { 407 if (__c == __str._M_delim || __c == __str._M_escape) 408 __ostr << __str._M_escape; 409 __ostr << __c; 410 } 411 __ostr << __str._M_delim; 412 413 return __os << __ostr.str(); 414 } 415 416 /** 417 * @brief Extractor for delimited strings. 418 * The left and right delimiters can be different. 419 */ 420 template<typename _CharT, typename _Traits, typename _Alloc> 421 auto& 422 operator>>(std::basic_istream<_CharT, _Traits>& __is, 423 const _Quoted_string<basic_string<_CharT, _Traits, _Alloc>&, 424 _CharT>& __str) 425 { 426 _CharT __c; 427 __is >> __c; 428 if (!__is.good()) 429 return __is; 430 if (__c != __str._M_delim) 431 { 432 __is.unget(); 433 __is >> __str._M_string; 434 return __is; 435 } 436 __str._M_string.clear(); 437 std::ios_base::fmtflags __flags 438 = __is.flags(__is.flags() & ~std::ios_base::skipws); 439 do 440 { 441 __is >> __c; 442 if (!__is.good()) 443 break; 444 if (__c == __str._M_escape) 445 { 446 __is >> __c; 447 if (!__is.good()) 448 break; 449 } 450 else if (__c == __str._M_delim) 451 break; 452 __str._M_string += __c; 453 } 454 while (true); 455 __is.setf(__flags); 456 457 return __is; 458 } 459 _GLIBCXX_END_NAMESPACE_VERSION 460 } // namespace __detail 461 _GLIBCXX_BEGIN_NAMESPACE_VERSION 462 463 /** 464 * @brief Manipulator for quoted strings. 465 * @param __str String to quote. 466 * @param __delim Character to quote string with. 467 * @param __escape Escape character to escape itself or quote character. 468 */ 469 template<typename _CharT> 470 inline auto 471 quoted(const _CharT* __string, 472 _CharT __delim = _CharT('"'), _CharT __escape = _CharT('\\')) 473 { 474 return __detail::_Quoted_string<const _CharT*, _CharT>(__string, __delim, 475 __escape); 476 } 477 478 template<typename _CharT, typename _Traits, typename _Alloc> 479 inline auto 480 quoted(const basic_string<_CharT, _Traits, _Alloc>& __string, 481 _CharT __delim = _CharT('"'), _CharT __escape = _CharT('\\')) 482 { 483 return __detail::_Quoted_string< 484 const basic_string<_CharT, _Traits, _Alloc>&, _CharT>( 485 __string, __delim, __escape); 486 } 487 488 template<typename _CharT, typename _Traits, typename _Alloc> 489 inline auto 490 quoted(basic_string<_CharT, _Traits, _Alloc>& __string, 491 _CharT __delim = _CharT('"'), _CharT __escape = _CharT('\\')) 492 { 493 return __detail::_Quoted_string< 494 basic_string<_CharT, _Traits, _Alloc>&, _CharT>( 495 __string, __delim, __escape); 496 } 497 498 #endif // __cplusplus > 201103L 499 500 #endif // __cplusplus >= 201103L 501 502 // Inhibit implicit instantiations for required instantiations, 503 // which are defined via explicit instantiations elsewhere. 504 // NB: This syntax is a GNU extension. 505 #if _GLIBCXX_EXTERN_TEMPLATE 506 extern template ostream& operator<<(ostream&, _Setfill<char>); 507 extern template ostream& operator<<(ostream&, _Setiosflags); 508 extern template ostream& operator<<(ostream&, _Resetiosflags); 509 extern template ostream& operator<<(ostream&, _Setbase); 510 extern template ostream& operator<<(ostream&, _Setprecision); 511 extern template ostream& operator<<(ostream&, _Setw); 512 extern template istream& operator>>(istream&, _Setfill<char>); 513 extern template istream& operator>>(istream&, _Setiosflags); 514 extern template istream& operator>>(istream&, _Resetiosflags); 515 extern template istream& operator>>(istream&, _Setbase); 516 extern template istream& operator>>(istream&, _Setprecision); 517 extern template istream& operator>>(istream&, _Setw); 518 519 #ifdef _GLIBCXX_USE_WCHAR_T 520 extern template wostream& operator<<(wostream&, _Setfill<wchar_t>); 521 extern template wostream& operator<<(wostream&, _Setiosflags); 522 extern template wostream& operator<<(wostream&, _Resetiosflags); 523 extern template wostream& operator<<(wostream&, _Setbase); 524 extern template wostream& operator<<(wostream&, _Setprecision); 525 extern template wostream& operator<<(wostream&, _Setw); 526 extern template wistream& operator>>(wistream&, _Setfill<wchar_t>); 527 extern template wistream& operator>>(wistream&, _Setiosflags); 528 extern template wistream& operator>>(wistream&, _Resetiosflags); 529 extern template wistream& operator>>(wistream&, _Setbase); 530 extern template wistream& operator>>(wistream&, _Setprecision); 531 extern template wistream& operator>>(wistream&, _Setw); 532 #endif 533 #endif 534 535 _GLIBCXX_END_NAMESPACE_VERSION 536 } // namespace 537 538 #endif /* _GLIBCXX_IOMANIP */ 539
