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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 | // String based streams -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.7 String-based streams
//
/** @file sstream
* This is a Standard C++ Library header. You should @c #include this header
* in your programs, rather than any of the "st[dl]_*.h" implementation files.
*/
#ifndef _CPP_SSTREAM
#define _CPP_SSTREAM 1
#pragma GCC system_header
#include <istream>
#include <ostream>
namespace std
{
// [27.7.1] template class basic_stringbuf
/**
* @brief The actual work of input and output (for std::string).
*
* This class associates either or both of its input and output sequences
* with a sequence of characters, which can be initialized from, or made
* available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.)
*
* For this class, open modes (of type @c ios_base::openmode) have
* @c in set if the input sequence can be read, and @c out set if the
* output sequence can be written.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
//@{
/**
* @if maint
* @doctodo
* @endif
*/
typedef basic_streambuf<char_type, traits_type> __streambuf_type;
typedef basic_string<char_type, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
//@}
protected:
// Data Members:
/**
* @if maint
* @doctodo
* @endif
*/
__string_type _M_string;
public:
// Constructors:
/**
* @brief Starts with an empty string buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* The default constructor initializes the parent class using its
* own default ctor.
*/
explicit
basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
: __streambuf_type(), _M_string()
{ _M_stringbuf_init(__mode); }
/**
* @brief Starts with an existing string buffer.
* @param str A string to copy as a starting buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* This constructor initializes the parent class using its
* own default ctor.
*/
explicit
basic_stringbuf(const __string_type& __str,
ios_base::openmode __mode = ios_base::in | ios_base::out)
: __streambuf_type(), _M_string(__str.data(), __str.size())
{ _M_stringbuf_init(__mode); }
// Get and set:
/**
* @brief Copying out the string buffer.
* @return A copy of one of the underlying sequences.
*
* "If the buffer is only created in input mode, the underlying
* character sequence is equal to the input sequence; otherwise, it
* is equal to the output sequence." [27.7.1.2]/1
*/
__string_type
str() const
{
if (this->_M_mode & ios_base::out)
{
// This is the deal: _M_string.size() is a value that
// represents the size of the initial string that makes
// _M_string, and may not be the correct size of the
// current stringbuf internal buffer.
__size_type __len = _M_string.size();
if (this->_M_out_end > this->_M_out_beg)
__len = max(__size_type(this->_M_out_end - this->_M_out_beg), __len);
return __string_type(this->_M_out_beg, this->_M_out_beg + __len);
}
else
return _M_string;
}
/**
* @brief Setting a new buffer.
* @param s The string to use as a new sequence.
*
* Deallocates any previous stored sequence, then copies @a s to
* use as a new one.
*/
void
str(const __string_type& __s)
{
// Cannot use _M_string = __s, since v3 strings are COW.
_M_string.assign(__s.data(), __s.size());
_M_stringbuf_init(this->_M_mode);
}
protected:
// Common initialization code for both ctors goes here.
/**
* @if maint
* @doctodo
* @endif
*/
void
_M_stringbuf_init(ios_base::openmode __mode)
{
// _M_buf_size is a convenient alias for "what the streambuf
// thinks the allocated size of the string really is." This is
// necessary as ostringstreams are implemented with the
// streambufs having control of the allocation and
// re-allocation of the internal string object, _M_string.
this->_M_buf_size = _M_string.size();
// NB: Start ostringstream buffers at 512 bytes. This is an
// experimental value (pronounced "arbitrary" in some of the
// hipper english-speaking countries), and can be changed to
// suit particular needs.
this->_M_buf_size_opt = 512;
this->_M_mode = __mode;
if (this->_M_mode & (ios_base::ate | ios_base::app))
_M_really_sync(0, this->_M_buf_size);
else
_M_really_sync(0, 0);
}
// Overridden virtual functions:
// [documentation is inherited]
virtual int_type
underflow()
{
if (this->_M_in_cur && this->_M_in_cur < this->_M_in_end)
return traits_type::to_int_type(*this->gptr());
else
return traits_type::eof();
}
// [documentation is inherited]
virtual int_type
pbackfail(int_type __c = traits_type::eof());
// [documentation is inherited]
virtual int_type
overflow(int_type __c = traits_type::eof());
/**
* @brief Manipulates the buffer.
* @param s Pointer to a buffer area.
* @param n Size of @a s.
* @return @c this
*
* If no buffer has already been created, and both @a s and @a n are
* non-zero, then @c s is used as a buffer; see
* http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2
* for more.
*/
virtual __streambuf_type*
setbuf(char_type* __s, streamsize __n)
{
if (__s && __n)
{
_M_string = __string_type(__s, __n);
_M_really_sync(0, 0);
}
return this;
}
// [documentation is inherited]
virtual pos_type
seekoff(off_type __off, ios_base::seekdir __way,
ios_base::openmode __mode = ios_base::in | ios_base::out);
// [documentation is inherited]
virtual pos_type
seekpos(pos_type __sp,
ios_base::openmode __mode = ios_base::in | ios_base::out);
// Internal function for correctly updating the internal buffer
// for a particular _M_string, due to initialization or
// re-sizing of an existing _M_string.
// Assumes: contents of _M_string and internal buffer match exactly.
// __i == _M_in_cur - _M_in_beg
// __o == _M_out_cur - _M_out_beg
/**
* @if maint
* @doctodo
* @endif
*/
virtual int
_M_really_sync(__size_type __i, __size_type __o)
{
char_type* __base = const_cast<char_type*>(_M_string.data());
bool __testin = this->_M_mode & ios_base::in;
bool __testout = this->_M_mode & ios_base::out;
__size_type __len = _M_string.size();
this->_M_buf = __base;
if (__testin)
this->setg(__base, __base + __i, __base + __len);
if (__testout)
{
this->setp(__base, __base + __len);
this->_M_out_cur += __o;
}
return 0;
}
};
// [27.7.2] Template class basic_istringstream
/**
* @brief Controlling input for std::string.
*
* This class supports reading from objects of type std::basic_string,
* using the inherited functions from std::basic_istream. To control
* the associated sequence, an instance of std::basic_stringbuf is used,
* which this page refers to as @c sb.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_istringstream : public basic_istream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_istream<char_type, traits_type> __istream_type;
private:
/**
* @if maint
* @doctodo
* @endif
*/
__stringbuf_type _M_stringbuf;
public:
// Constructors:
/**
* @brief Default constructor starts with an empty string buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* @c ios_base::in is automatically included in @a mode.
*
* Initializes @c sb using @c mode|in, and passes @c &sb to the base
* class initializer. Does not allocate any buffer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_istringstream(ios_base::openmode __mode = ios_base::in)
: __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)
{ this->init(&_M_stringbuf); }
/**
* @brief Starts with an existing string buffer.
* @param str A string to copy as a starting buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* @c ios_base::in is automatically included in @a mode.
*
* Initializes @c sb using @a str and @c mode|in, and passes @c &sb
* to the base class initializer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_istringstream(const __string_type& __str,
ios_base::openmode __mode = ios_base::in)
: __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)
{ this->init(&_M_stringbuf); }
/**
* @brief The destructor does nothing.
*
* The buffer is deallocated by the stringbuf object, not the
* formatting stream.
*/
~basic_istringstream()
{ }
// Members:
/**
* @brief Accessing the underlying buffer.
* @return The current basic_stringbuf buffer.
*
* This hides both signatures of std::basic_ios::rdbuf().
*/
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
/**
* @brief Copying out the string buffer.
* @return @c rdbuf()->str()
*/
__string_type
str() const
{ return _M_stringbuf.str(); }
/**
* @brief Setting a new buffer.
* @param s The string to use as a new sequence.
*
* Calls @c rdbuf()->str(s).
*/
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
// [27.7.3] Template class basic_ostringstream
/**
* @brief Controlling output for std::string.
*
* This class supports writing to objects of type std::basic_string,
* using the inherited functions from std::basic_ostream. To control
* the associated sequence, an instance of std::basic_stringbuf is used,
* which this page refers to as @c sb.
*/
template <typename _CharT, typename _Traits, typename _Alloc>
class basic_ostringstream : public basic_ostream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_ostream<char_type, traits_type> __ostream_type;
private:
/**
* @if maint
* @doctodo
* @endif
*/
__stringbuf_type _M_stringbuf;
public:
// Constructors/destructor:
/**
* @brief Default constructor starts with an empty string buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* @c ios_base::out is automatically included in @a mode.
*
* Initializes @c sb using @c mode|out, and passes @c &sb to the base
* class initializer. Does not allocate any buffer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_ostringstream(ios_base::openmode __mode = ios_base::out)
: __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)
{ this->init(&_M_stringbuf); }
/**
* @brief Starts with an existing string buffer.
* @param str A string to copy as a starting buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* @c ios_base::out is automatically included in @a mode.
*
* Initializes @c sb using @a str and @c mode|out, and passes @c &sb
* to the base class initializer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_ostringstream(const __string_type& __str,
ios_base::openmode __mode = ios_base::out)
: __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)
{ this->init(&_M_stringbuf); }
/**
* @brief The destructor does nothing.
*
* The buffer is deallocated by the stringbuf object, not the
* formatting stream.
*/
~basic_ostringstream()
{ }
// Members:
/**
* @brief Accessing the underlying buffer.
* @return The current basic_stringbuf buffer.
*
* This hides both signatures of std::basic_ios::rdbuf().
*/
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
/**
* @brief Copying out the string buffer.
* @return @c rdbuf()->str()
*/
__string_type
str() const
{ return _M_stringbuf.str(); }
/**
* @brief Setting a new buffer.
* @param s The string to use as a new sequence.
*
* Calls @c rdbuf()->str(s).
*/
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
// [27.7.4] Template class basic_stringstream
/**
* @brief Controlling input and output for std::string.
*
* This class supports reading from and writing to objects of type
* std::basic_string, using the inherited functions from
* std::basic_iostream. To control the associated sequence, an instance
* of std::basic_stringbuf is used, which this page refers to as @c sb.
*/
template <typename _CharT, typename _Traits, typename _Alloc>
class basic_stringstream : public basic_iostream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard Types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_iostream<char_type, traits_type> __iostream_type;
private:
/**
* @if maint
* @doctodo
* @endif
*/
__stringbuf_type _M_stringbuf;
public:
// Constructors/destructors
/**
* @brief Default constructor starts with an empty string buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* Initializes @c sb using @c mode, and passes @c &sb to the base
* class initializer. Does not allocate any buffer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
: __iostream_type(NULL), _M_stringbuf(__m)
{ this->init(&_M_stringbuf); }
/**
* @brief Starts with an existing string buffer.
* @param str A string to copy as a starting buffer.
* @param mode Whether the buffer can read, or write, or both.
*
* Initializes @c sb using @a str and @c mode, and passes @c &sb
* to the base class initializer.
*
* @if maint
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
* @endif
*/
explicit
basic_stringstream(const __string_type& __str,
ios_base::openmode __m = ios_base::out | ios_base::in)
: __iostream_type(NULL), _M_stringbuf(__str, __m)
{ this->init(&_M_stringbuf); }
/**
* @brief The destructor does nothing.
*
* The buffer is deallocated by the stringbuf object, not the
* formatting stream.
*/
~basic_stringstream()
{ }
// Members:
/**
* @brief Accessing the underlying buffer.
* @return The current basic_stringbuf buffer.
*
* This hides both signatures of std::basic_ios::rdbuf().
*/
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
/**
* @brief Copying out the string buffer.
* @return @c rdbuf()->str()
*/
__string_type
str() const
{ return _M_stringbuf.str(); }
/**
* @brief Setting a new buffer.
* @param s The string to use as a new sequence.
*
* Calls @c rdbuf()->str(s).
*/
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
} // namespace std
#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
# define export
#endif
#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
# include <bits/sstream.tcc>
#endif
#endif
|