LCOV - lcov.info - /usr/include/c++/4.3/bits/basic_string.tcc

LTP GCOV extension - code coverage report
Current view: | directory - usr/include/c++/4.3/bits - basic_string.tcc
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 23
Code covered: | 73.9 % |  | Executed lines: | 17

           1                 : // Components for manipulating sequences of characters -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
           4                 : // 2006, 2007
           5                 : // Free Software Foundation, Inc.
           6                 : //
           7                 : // This file is part of the GNU ISO C++ Library.  This library is free
           8                 : // software; you can redistribute it and/or modify it under the
           9                 : // terms of the GNU General Public License as published by the
          10                 : // Free Software Foundation; either version 2, or (at your option)
          11                 : // any later version.
          12                 :
          13                 : // This library is distributed in the hope that it will be useful,
          14                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
          15                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          16                 : // GNU General Public License for more details.
          17                 :
          18                 : // You should have received a copy of the GNU General Public License along
          19                 : // with this library; see the file COPYING.  If not, write to the Free
          20                 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
          21                 : // USA.
          22                 :
          23                 : // As a special exception, you may use this file as part of a free software
          24                 : // library without restriction.  Specifically, if other files instantiate
          25                 : // templates or use macros or inline functions from this file, or you compile
          26                 : // this file and link it with other files to produce an executable, this
          27                 : // file does not by itself cause the resulting executable to be covered by
          28                 : // the GNU General Public License.  This exception does not however
          29                 : // invalidate any other reasons why the executable file might be covered by
          30                 : // the GNU General Public License.
          31                 :
          32                 : /** @file basic_string.tcc
          33                 :  *  This is an internal header file, included by other library headers.
          34                 :  *  You should not attempt to use it directly.
          35                 :  */
          36                 :
          37                 : //
          38                 : // ISO C++ 14882: 21  Strings library
          39                 : //
          40                 :
          41                 : // Written by Jason Merrill based upon the specification by Takanori Adachi
          42                 : // in ANSI X3J16/94-0013R2.  Rewritten by Nathan Myers to ISO-14882.
          43                 :
          44                 : #ifndef _BASIC_STRING_TCC
          45                 : #define _BASIC_STRING_TCC 1
          46                 :
          47                 : #pragma GCC system_header
          48                 :
          49                 : #include <cxxabi-forced.h>
          50                 :
          51                 : _GLIBCXX_BEGIN_NAMESPACE(std)
          52                 :
          53                 :   template<typename _CharT, typename _Traits, typename _Alloc>
          54                 :     const typename basic_string<_CharT, _Traits, _Alloc>::size_type
          55                 :     basic_string<_CharT, _Traits, _Alloc>::
          56                 :     _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;
          57                 :
          58                 :   template<typename _CharT, typename _Traits, typename _Alloc>
          59                 :     const _CharT
          60                 :     basic_string<_CharT, _Traits, _Alloc>::
          61                 :     _Rep::_S_terminal = _CharT();
          62                 :
          63                 :   template<typename _CharT, typename _Traits, typename _Alloc>
          64                 :     const typename basic_string<_CharT, _Traits, _Alloc>::size_type
          65                 :     basic_string<_CharT, _Traits, _Alloc>::npos;
          66                 :
          67                 :   // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
          68                 :   // at static init time (before static ctors are run).
          69                 :   template<typename _CharT, typename _Traits, typename _Alloc>
          70                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
          71                 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
          72                 :     (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
          73                 :       sizeof(size_type)];
          74                 :
          75                 :   // NB: This is the special case for Input Iterators, used in
          76                 :   // istreambuf_iterators, etc.
          77                 :   // Input Iterators have a cost structure very different from
          78                 :   // pointers, calling for a different coding style.
          79                 :   template<typename _CharT, typename _Traits, typename _Alloc>
          80                 :     template<typename _InIterator>
          81                 :       _CharT*
          82                 :       basic_string<_CharT, _Traits, _Alloc>::
          83                 :       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
          84                 :                    input_iterator_tag)
          85                 :       {
          86                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
          87                 :         if (__beg == __end && __a == _Alloc())
          88                 :           return _S_empty_rep()._M_refdata();
          89                 : #endif
          90                 :         // Avoid reallocation for common case.
          91                 :         _CharT __buf[128];
          92                 :         size_type __len = 0;
          93                 :         while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
          94                 :           {
          95                 :             __buf[__len++] = *__beg;
          96                 :             ++__beg;
          97                 :           }
          98                 :         _Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
          99                 :         _M_copy(__r->_M_refdata(), __buf, __len);
         100                 :         try
         101                 :           {
         102                 :             while (__beg != __end)
         103                 :               {
         104                 :                 if (__len == __r->_M_capacity)
         105                 :                   {
         106                 :                     // Allocate more space.
         107                 :                     _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
         108                 :                     _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
         109                 :                     __r->_M_destroy(__a);
         110                 :                     __r = __another;
         111                 :                   }
         112                 :                 __r->_M_refdata()[__len++] = *__beg;
         113                 :                 ++__beg;
         114                 :               }
         115                 :           }
         116                 :         catch(...)
         117                 :           {
         118                 :             __r->_M_destroy(__a);
         119                 :             __throw_exception_again;
         120                 :           }
         121                 :         __r->_M_set_length_and_sharable(__len);
         122                 :         return __r->_M_refdata();
         123                 :       }
         124                 :
         125                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         126                 :     template <typename _InIterator>
         127                 :       _CharT*
         128                 :       basic_string<_CharT, _Traits, _Alloc>::
         129                 :       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
         130            1287 :                    forward_iterator_tag)
         131                 :       {
         132                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
         133            1287 :         if (__beg == __end && __a == _Alloc())
         134               0 :           return _S_empty_rep()._M_refdata();
         135                 : #endif
         136                 :         // NB: Not required, but considered best practice.
         137            1287 :         if (__builtin_expect(__gnu_cxx::__is_null_pointer(__beg)
         138                 :                              && __beg != __end, 0))
         139               0 :           __throw_logic_error(__N("basic_string::_S_construct NULL not valid"));
         140                 :
         141                 :         const size_type __dnew = static_cast<size_type>(std::distance(__beg,
         142            1287 :                                                                       __end));
         143                 :         // Check for out_of_range and length_error exceptions.
         144            1287 :         _Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
         145                 :         try
         146            1287 :           { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
         147               0 :         catch(...)
         148                 :           {
         149               0 :             __r->_M_destroy(__a);
         150               0 :             __throw_exception_again;
         151                 :           }
         152            1287 :         __r->_M_set_length_and_sharable(__dnew);
         153            1287 :         return __r->_M_refdata();
         154                 :       }
         155                 :
         156                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         157                 :     _CharT*
         158                 :     basic_string<_CharT, _Traits, _Alloc>::
         159                 :     _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
         160                 :     {
         161                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
         162                 :       if (__n == 0 && __a == _Alloc())
         163                 :         return _S_empty_rep()._M_refdata();
         164                 : #endif
         165                 :       // Check for out_of_range and length_error exceptions.
         166                 :       _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
         167                 :       if (__n)
         168                 :         _M_assign(__r->_M_refdata(), __n, __c);
         169                 :
         170                 :       __r->_M_set_length_and_sharable(__n);
         171                 :       return __r->_M_refdata();
         172                 :     }
         173                 :
         174                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         175                 :     basic_string<_CharT, _Traits, _Alloc>::
         176                 :     basic_string(const basic_string& __str)
         177                 :     : _M_dataplus(__str._M_rep()->_M_grab(_Alloc(__str.get_allocator()),
         178                 :                                           __str.get_allocator()),
         179                 :                   __str.get_allocator())
         180                 :     { }
         181                 :
         182                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         183                 :     basic_string<_CharT, _Traits, _Alloc>::
         184                 :     basic_string(const _Alloc& __a)
         185                 :     : _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
         186                 :     { }
         187                 :
         188                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         189                 :     basic_string<_CharT, _Traits, _Alloc>::
         190                 :     basic_string(const basic_string& __str, size_type __pos, size_type __n)
         191                 :     : _M_dataplus(_S_construct(__str._M_data()
         192                 :                                + __str._M_check(__pos,
         193                 :                                                 "basic_string::basic_string"),
         194                 :                                __str._M_data() + __str._M_limit(__pos, __n)
         195                 :                                + __pos, _Alloc()), _Alloc())
         196                 :     { }
         197                 :
         198                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         199                 :     basic_string<_CharT, _Traits, _Alloc>::
         200                 :     basic_string(const basic_string& __str, size_type __pos,
         201                 :                  size_type __n, const _Alloc& __a)
         202                 :     : _M_dataplus(_S_construct(__str._M_data()
         203                 :                                + __str._M_check(__pos,
         204                 :                                                 "basic_string::basic_string"),
         205                 :                                __str._M_data() + __str._M_limit(__pos, __n)
         206                 :                                + __pos, __a), __a)
         207                 :     { }
         208                 :
         209                 :   // TBD: DPG annotate
         210                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         211                 :     basic_string<_CharT, _Traits, _Alloc>::
         212                 :     basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
         213                 :     : _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
         214                 :     { }
         215                 :
         216                 :   // TBD: DPG annotate
         217                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         218                 :     basic_string<_CharT, _Traits, _Alloc>::
         219                 :     basic_string(const _CharT* __s, const _Alloc& __a)
         220                 :     : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
         221                 :                                __s + npos, __a), __a)
         222                 :     { }
         223                 :
         224                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         225                 :     basic_string<_CharT, _Traits, _Alloc>::
         226                 :     basic_string(size_type __n, _CharT __c, const _Alloc& __a)
         227                 :     : _M_dataplus(_S_construct(__n, __c, __a), __a)
         228                 :     { }
         229                 :
         230                 :   // TBD: DPG annotate
         231                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         232                 :     template<typename _InputIterator>
         233                 :     basic_string<_CharT, _Traits, _Alloc>::
         234            1287 :     basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a)
         235            1287 :     : _M_dataplus(_S_construct(__beg, __end, __a), __a)
         236            1287 :     { }
         237                 :
         238                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         239                 :     basic_string<_CharT, _Traits, _Alloc>&
         240                 :     basic_string<_CharT, _Traits, _Alloc>::
         241                 :     assign(const basic_string& __str)
         242                 :     {
         243                 :       if (_M_rep() != __str._M_rep())
         244                 :         {
         245                 :           // XXX MT
         246                 :           const allocator_type __a = this->get_allocator();
         247                 :           _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
         248                 :           _M_rep()->_M_dispose(__a);
         249                 :           _M_data(__tmp);
         250                 :         }
         251                 :       return *this;
         252                 :     }
         253                 :
         254                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         255                 :     basic_string<_CharT, _Traits, _Alloc>&
         256                 :     basic_string<_CharT, _Traits, _Alloc>::
         257                 :     assign(const _CharT* __s, size_type __n)
         258                 :     {
         259                 :       __glibcxx_requires_string_len(__s, __n);
         260                 :       _M_check_length(this->size(), __n, "basic_string::assign");
         261                 :       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         262                 :         return _M_replace_safe(size_type(0), this->size(), __s, __n);
         263                 :       else
         264                 :         {
         265                 :           // Work in-place.
         266                 :           const size_type __pos = __s - _M_data();
         267                 :           if (__pos >= __n)
         268                 :             _M_copy(_M_data(), __s, __n);
         269                 :           else if (__pos)
         270                 :             _M_move(_M_data(), __s, __n);
         271                 :           _M_rep()->_M_set_length_and_sharable(__n);
         272                 :           return *this;
         273                 :         }
         274                 :      }
         275                 :
         276                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         277                 :     basic_string<_CharT, _Traits, _Alloc>&
         278                 :     basic_string<_CharT, _Traits, _Alloc>::
         279                 :     append(size_type __n, _CharT __c)
         280                 :     {
         281                 :       if (__n)
         282                 :         {
         283                 :           _M_check_length(size_type(0), __n, "basic_string::append");
         284                 :           const size_type __len = __n + this->size();
         285                 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
         286                 :             this->reserve(__len);
         287                 :           _M_assign(_M_data() + this->size(), __n, __c);
         288                 :           _M_rep()->_M_set_length_and_sharable(__len);
         289                 :         }
         290                 :       return *this;
         291                 :     }
         292                 :
         293                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         294                 :     basic_string<_CharT, _Traits, _Alloc>&
         295                 :     basic_string<_CharT, _Traits, _Alloc>::
         296                 :     append(const _CharT* __s, size_type __n)
         297                 :     {
         298                 :       __glibcxx_requires_string_len(__s, __n);
         299                 :       if (__n)
         300                 :         {
         301                 :           _M_check_length(size_type(0), __n, "basic_string::append");
         302                 :           const size_type __len = __n + this->size();
         303                 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
         304                 :             {
         305                 :               if (_M_disjunct(__s))
         306                 :                 this->reserve(__len);
         307                 :               else
         308                 :                 {
         309                 :                   const size_type __off = __s - _M_data();
         310                 :                   this->reserve(__len);
         311                 :                   __s = _M_data() + __off;
         312                 :                 }
         313                 :             }
         314                 :           _M_copy(_M_data() + this->size(), __s, __n);
         315                 :           _M_rep()->_M_set_length_and_sharable(__len);
         316                 :         }
         317                 :       return *this;
         318                 :     }
         319                 :
         320                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         321                 :     basic_string<_CharT, _Traits, _Alloc>&
         322                 :     basic_string<_CharT, _Traits, _Alloc>::
         323                 :     append(const basic_string& __str)
         324                 :     {
         325                 :       const size_type __size = __str.size();
         326                 :       if (__size)
         327                 :         {
         328                 :           const size_type __len = __size + this->size();
         329                 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
         330                 :             this->reserve(__len);
         331                 :           _M_copy(_M_data() + this->size(), __str._M_data(), __size);
         332                 :           _M_rep()->_M_set_length_and_sharable(__len);
         333                 :         }
         334                 :       return *this;
         335                 :     }
         336                 :
         337                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         338                 :     basic_string<_CharT, _Traits, _Alloc>&
         339                 :     basic_string<_CharT, _Traits, _Alloc>::
         340                 :     append(const basic_string& __str, size_type __pos, size_type __n)
         341                 :     {
         342                 :       __str._M_check(__pos, "basic_string::append");
         343                 :       __n = __str._M_limit(__pos, __n);
         344                 :       if (__n)
         345                 :         {
         346                 :           const size_type __len = __n + this->size();
         347                 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
         348                 :             this->reserve(__len);
         349                 :           _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
         350                 :           _M_rep()->_M_set_length_and_sharable(__len);
         351                 :         }
         352                 :       return *this;
         353                 :     }
         354                 :
         355                 :    template<typename _CharT, typename _Traits, typename _Alloc>
         356                 :      basic_string<_CharT, _Traits, _Alloc>&
         357                 :      basic_string<_CharT, _Traits, _Alloc>::
         358                 :      insert(size_type __pos, const _CharT* __s, size_type __n)
         359                 :      {
         360                 :        __glibcxx_requires_string_len(__s, __n);
         361                 :        _M_check(__pos, "basic_string::insert");
         362                 :        _M_check_length(size_type(0), __n, "basic_string::insert");
         363                 :        if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         364                 :          return _M_replace_safe(__pos, size_type(0), __s, __n);
         365                 :        else
         366                 :          {
         367                 :            // Work in-place.
         368                 :            const size_type __off = __s - _M_data();
         369                 :            _M_mutate(__pos, 0, __n);
         370                 :            __s = _M_data() + __off;
         371                 :            _CharT* __p = _M_data() + __pos;
         372                 :            if (__s  + __n <= __p)
         373                 :              _M_copy(__p, __s, __n);
         374                 :            else if (__s >= __p)
         375                 :              _M_copy(__p, __s + __n, __n);
         376                 :            else
         377                 :              {
         378                 :                const size_type __nleft = __p - __s;
         379                 :                _M_copy(__p, __s, __nleft);
         380                 :                _M_copy(__p + __nleft, __p + __n, __n - __nleft);
         381                 :              }
         382                 :            return *this;
         383                 :          }
         384                 :      }
         385                 :
         386                 :    template<typename _CharT, typename _Traits, typename _Alloc>
         387                 :      basic_string<_CharT, _Traits, _Alloc>&
         388                 :      basic_string<_CharT, _Traits, _Alloc>::
         389                 :      replace(size_type __pos, size_type __n1, const _CharT* __s,
         390                 :              size_type __n2)
         391                 :      {
         392                 :        __glibcxx_requires_string_len(__s, __n2);
         393                 :        _M_check(__pos, "basic_string::replace");
         394                 :        __n1 = _M_limit(__pos, __n1);
         395                 :        _M_check_length(__n1, __n2, "basic_string::replace");
         396                 :        bool __left;
         397                 :        if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         398                 :          return _M_replace_safe(__pos, __n1, __s, __n2);
         399                 :        else if ((__left = __s + __n2 <= _M_data() + __pos)
         400                 :                 || _M_data() + __pos + __n1 <= __s)
         401                 :          {
         402                 :            // Work in-place: non-overlapping case.
         403                 :            size_type __off = __s - _M_data();
         404                 :            __left ? __off : (__off += __n2 - __n1);
         405                 :            _M_mutate(__pos, __n1, __n2);
         406                 :            _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
         407                 :            return *this;
         408                 :          }
         409                 :        else
         410                 :          {
         411                 :            // Todo: overlapping case.
         412                 :            const basic_string __tmp(__s, __n2);
         413                 :            return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
         414                 :          }
         415                 :      }
         416                 :
         417                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         418                 :     void
         419                 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
         420                 :     _M_destroy(const _Alloc& __a) throw ()
         421                 :     {
         422                 :       const size_type __size = sizeof(_Rep_base) +
         423                 :                                (this->_M_capacity + 1) * sizeof(_CharT);
         424                 :       _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
         425                 :     }
         426                 :
         427                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         428                 :     void
         429                 :     basic_string<_CharT, _Traits, _Alloc>::
         430                 :     _M_leak_hard()
         431                 :     {
         432                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
         433                 :       if (_M_rep() == &_S_empty_rep())
         434                 :         return;
         435                 : #endif
         436                 :       if (_M_rep()->_M_is_shared())
         437                 :         _M_mutate(0, 0, 0);
         438                 :       _M_rep()->_M_set_leaked();
         439                 :     }
         440                 :
         441                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         442                 :     void
         443                 :     basic_string<_CharT, _Traits, _Alloc>::
         444                 :     _M_mutate(size_type __pos, size_type __len1, size_type __len2)
         445                 :     {
         446                 :       const size_type __old_size = this->size();
         447                 :       const size_type __new_size = __old_size + __len2 - __len1;
         448                 :       const size_type __how_much = __old_size - __pos - __len1;
         449                 :
         450                 :       if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
         451                 :         {
         452                 :           // Must reallocate.
         453                 :           const allocator_type __a = get_allocator();
         454                 :           _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);
         455                 :
         456                 :           if (__pos)
         457                 :             _M_copy(__r->_M_refdata(), _M_data(), __pos);
         458                 :           if (__how_much)
         459                 :             _M_copy(__r->_M_refdata() + __pos + __len2,
         460                 :                     _M_data() + __pos + __len1, __how_much);
         461                 :
         462                 :           _M_rep()->_M_dispose(__a);
         463                 :           _M_data(__r->_M_refdata());
         464                 :         }
         465                 :       else if (__how_much && __len1 != __len2)
         466                 :         {
         467                 :           // Work in-place.
         468                 :           _M_move(_M_data() + __pos + __len2,
         469                 :                   _M_data() + __pos + __len1, __how_much);
         470                 :         }
         471                 :       _M_rep()->_M_set_length_and_sharable(__new_size);
         472                 :     }
         473                 :
         474                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         475                 :     void
         476                 :     basic_string<_CharT, _Traits, _Alloc>::
         477                 :     reserve(size_type __res)
         478                 :     {
         479                 :       if (__res != this->capacity() || _M_rep()->_M_is_shared())
         480                 :         {
         481                 :           // Make sure we don't shrink below the current size
         482                 :           if (__res < this->size())
         483                 :             __res = this->size();
         484                 :           const allocator_type __a = get_allocator();
         485                 :           _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
         486                 :           _M_rep()->_M_dispose(__a);
         487                 :           _M_data(__tmp);
         488                 :         }
         489                 :     }
         490                 :
         491                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         492                 :     void
         493                 :     basic_string<_CharT, _Traits, _Alloc>::
         494                 :     swap(basic_string& __s)
         495                 :     {
         496                 :       if (_M_rep()->_M_is_leaked())
         497                 :         _M_rep()->_M_set_sharable();
         498                 :       if (__s._M_rep()->_M_is_leaked())
         499                 :         __s._M_rep()->_M_set_sharable();
         500                 :       if (this->get_allocator() == __s.get_allocator())
         501                 :         {
         502                 :           _CharT* __tmp = _M_data();
         503                 :           _M_data(__s._M_data());
         504                 :           __s._M_data(__tmp);
         505                 :         }
         506                 :       // The code below can usually be optimized away.
         507                 :       else
         508                 :         {
         509                 :           const basic_string __tmp1(_M_ibegin(), _M_iend(),
         510                 :                                     __s.get_allocator());
         511                 :           const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
         512                 :                                     this->get_allocator());
         513                 :           *this = __tmp2;
         514                 :           __s = __tmp1;
         515                 :         }
         516                 :     }
         517                 :
         518                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         519                 :     typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
         520                 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
         521                 :     _S_create(size_type __capacity, size_type __old_capacity,
         522                 :               const _Alloc& __alloc)
         523                 :     {
         524                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
         525                 :       // 83.  String::npos vs. string::max_size()
         526                 :       if (__capacity > _S_max_size)
         527                 :         __throw_length_error(__N("basic_string::_S_create"));
         528                 :
         529                 :       // The standard places no restriction on allocating more memory
         530                 :       // than is strictly needed within this layer at the moment or as
         531                 :       // requested by an explicit application call to reserve().
         532                 :
         533                 :       // Many malloc implementations perform quite poorly when an
         534                 :       // application attempts to allocate memory in a stepwise fashion
         535                 :       // growing each allocation size by only 1 char.  Additionally,
         536                 :       // it makes little sense to allocate less linear memory than the
         537                 :       // natural blocking size of the malloc implementation.
         538                 :       // Unfortunately, we would need a somewhat low-level calculation
         539                 :       // with tuned parameters to get this perfect for any particular
         540                 :       // malloc implementation.  Fortunately, generalizations about
         541                 :       // common features seen among implementations seems to suffice.
         542                 :
         543                 :       // __pagesize need not match the actual VM page size for good
         544                 :       // results in practice, thus we pick a common value on the low
         545                 :       // side.  __malloc_header_size is an estimate of the amount of
         546                 :       // overhead per memory allocation (in practice seen N * sizeof
         547                 :       // (void*) where N is 0, 2 or 4).  According to folklore,
         548                 :       // picking this value on the high side is better than
         549                 :       // low-balling it (especially when this algorithm is used with
         550                 :       // malloc implementations that allocate memory blocks rounded up
         551                 :       // to a size which is a power of 2).
         552                 :       const size_type __pagesize = 4096;
         553                 :       const size_type __malloc_header_size = 4 * sizeof(void*);
         554                 :
         555                 :       // The below implements an exponential growth policy, necessary to
         556                 :       // meet amortized linear time requirements of the library: see
         557                 :       // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
         558                 :       // It's active for allocations requiring an amount of memory above
         559                 :       // system pagesize. This is consistent with the requirements of the
         560                 :       // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
         561                 :       if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
         562                 :         __capacity = 2 * __old_capacity;
         563                 :
         564                 :       // NB: Need an array of char_type[__capacity], plus a terminating
         565                 :       // null char_type() element, plus enough for the _Rep data structure.
         566                 :       // Whew. Seemingly so needy, yet so elemental.
         567                 :       size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
         568                 :
         569                 :       const size_type __adj_size = __size + __malloc_header_size;
         570                 :       if (__adj_size > __pagesize && __capacity > __old_capacity)
         571                 :         {
         572                 :           const size_type __extra = __pagesize - __adj_size % __pagesize;
         573                 :           __capacity += __extra / sizeof(_CharT);
         574                 :           // Never allocate a string bigger than _S_max_size.
         575                 :           if (__capacity > _S_max_size)
         576                 :             __capacity = _S_max_size;
         577                 :           __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
         578                 :         }
         579                 :
         580                 :       // NB: Might throw, but no worries about a leak, mate: _Rep()
         581                 :       // does not throw.
         582                 :       void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
         583                 :       _Rep *__p = new (__place) _Rep;
         584                 :       __p->_M_capacity = __capacity;
         585                 :       // ABI compatibility - 3.4.x set in _S_create both
         586                 :       // _M_refcount and _M_length.  All callers of _S_create
         587                 :       // in basic_string.tcc then set just _M_length.
         588                 :       // In 4.0.x and later both _M_refcount and _M_length
         589                 :       // are initialized in the callers, unfortunately we can
         590                 :       // have 3.4.x compiled code with _S_create callers inlined
         591                 :       // calling 4.0.x+ _S_create.
         592                 :       __p->_M_set_sharable();
         593                 :       return __p;
         594                 :     }
         595                 :
         596                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         597                 :     _CharT*
         598                 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
         599                 :     _M_clone(const _Alloc& __alloc, size_type __res)
         600                 :     {
         601                 :       // Requested capacity of the clone.
         602                 :       const size_type __requested_cap = this->_M_length + __res;
         603                 :       _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
         604                 :                                   __alloc);
         605                 :       if (this->_M_length)
         606                 :         _M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);
         607                 :
         608                 :       __r->_M_set_length_and_sharable(this->_M_length);
         609                 :       return __r->_M_refdata();
         610                 :     }
         611                 :
         612                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         613                 :     void
         614                 :     basic_string<_CharT, _Traits, _Alloc>::
         615                 :     resize(size_type __n, _CharT __c)
         616                 :     {
         617                 :       const size_type __size = this->size();
         618                 :       _M_check_length(__size, __n, "basic_string::resize");
         619                 :       if (__size < __n)
         620                 :         this->append(__n - __size, __c);
         621                 :       else if (__n < __size)
         622                 :         this->erase(__n);
         623                 :       // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
         624                 :     }
         625                 :
         626                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         627                 :     template<typename _InputIterator>
         628                 :       basic_string<_CharT, _Traits, _Alloc>&
         629                 :       basic_string<_CharT, _Traits, _Alloc>::
         630                 :       _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
         631                 :                           _InputIterator __k2, __false_type)
         632                 :       {
         633                 :         const basic_string __s(__k1, __k2);
         634                 :         const size_type __n1 = __i2 - __i1;
         635                 :         _M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
         636                 :         return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
         637                 :                                __s.size());
         638                 :       }
         639                 :
         640                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         641                 :     basic_string<_CharT, _Traits, _Alloc>&
         642                 :     basic_string<_CharT, _Traits, _Alloc>::
         643                 :     _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
         644                 :                    _CharT __c)
         645                 :     {
         646                 :       _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
         647                 :       _M_mutate(__pos1, __n1, __n2);
         648                 :       if (__n2)
         649                 :         _M_assign(_M_data() + __pos1, __n2, __c);
         650                 :       return *this;
         651                 :     }
         652                 :
         653                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         654                 :     basic_string<_CharT, _Traits, _Alloc>&
         655                 :     basic_string<_CharT, _Traits, _Alloc>::
         656                 :     _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
         657                 :                     size_type __n2)
         658                 :     {
         659                 :       _M_mutate(__pos1, __n1, __n2);
         660                 :       if (__n2)
         661                 :         _M_copy(_M_data() + __pos1, __s, __n2);
         662                 :       return *this;
         663                 :     }
         664                 :
         665                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         666                 :     basic_string<_CharT, _Traits, _Alloc>
         667                 :     operator+(const _CharT* __lhs,
         668            2633 :               const basic_string<_CharT, _Traits, _Alloc>& __rhs)
         669                 :     {
         670                 :       __glibcxx_requires_string(__lhs);
         671                 :       typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
         672                 :       typedef typename __string_type::size_type   __size_type;
         673            2633 :       const __size_type __len = _Traits::length(__lhs);
         674            2633 :       __string_type __str;
         675            2633 :       __str.reserve(__len + __rhs.size());
         676            2633 :       __str.append(__lhs, __len);
         677            2633 :       __str.append(__rhs);
         678               0 :       return __str;
         679                 :     }
         680                 :
         681                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         682                 :     basic_string<_CharT, _Traits, _Alloc>
         683                 :     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
         684                 :     {
         685                 :       typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
         686                 :       typedef typename __string_type::size_type   __size_type;
         687                 :       __string_type __str;
         688                 :       const __size_type __len = __rhs.size();
         689                 :       __str.reserve(__len + 1);
         690                 :       __str.append(__size_type(1), __lhs);
         691                 :       __str.append(__rhs);
         692                 :       return __str;
         693                 :     }
         694                 :
         695                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         696                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         697                 :     basic_string<_CharT, _Traits, _Alloc>::
         698                 :     copy(_CharT* __s, size_type __n, size_type __pos) const
         699                 :     {
         700                 :       _M_check(__pos, "basic_string::copy");
         701                 :       __n = _M_limit(__pos, __n);
         702                 :       __glibcxx_requires_string_len(__s, __n);
         703                 :       if (__n)
         704                 :         _M_copy(__s, _M_data() + __pos, __n);
         705                 :       // 21.3.5.7 par 3: do not append null.  (good.)
         706                 :       return __n;
         707                 :     }
         708                 :
         709                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         710                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         711                 :     basic_string<_CharT, _Traits, _Alloc>::
         712                 :     find(const _CharT* __s, size_type __pos, size_type __n) const
         713                 :     {
         714                 :       __glibcxx_requires_string_len(__s, __n);
         715                 :       const size_type __size = this->size();
         716                 :       const _CharT* __data = _M_data();
         717                 :
         718                 :       if (__n == 0)
         719                 :         return __pos <= __size ? __pos : npos;
         720                 :
         721                 :       if (__n <= __size)
         722                 :         {
         723                 :           for (; __pos <= __size - __n; ++__pos)
         724                 :             if (traits_type::eq(__data[__pos], __s[0])
         725                 :                 && traits_type::compare(__data + __pos + 1,
         726                 :                                         __s + 1, __n - 1) == 0)
         727                 :               return __pos;
         728                 :         }
         729                 :       return npos;
         730                 :     }
         731                 :
         732                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         733                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         734                 :     basic_string<_CharT, _Traits, _Alloc>::
         735                 :     find(_CharT __c, size_type __pos) const
         736                 :     {
         737                 :       size_type __ret = npos;
         738                 :       const size_type __size = this->size();
         739                 :       if (__pos < __size)
         740                 :         {
         741                 :           const _CharT* __data = _M_data();
         742                 :           const size_type __n = __size - __pos;
         743                 :           const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
         744                 :           if (__p)
         745                 :             __ret = __p - __data;
         746                 :         }
         747                 :       return __ret;
         748                 :     }
         749                 :
         750                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         751                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         752                 :     basic_string<_CharT, _Traits, _Alloc>::
         753                 :     rfind(const _CharT* __s, size_type __pos, size_type __n) const
         754                 :     {
         755                 :       __glibcxx_requires_string_len(__s, __n);
         756                 :       const size_type __size = this->size();
         757                 :       if (__n <= __size)
         758                 :         {
         759                 :           __pos = std::min(size_type(__size - __n), __pos);
         760                 :           const _CharT* __data = _M_data();
         761                 :           do
         762                 :             {
         763                 :               if (traits_type::compare(__data + __pos, __s, __n) == 0)
         764                 :                 return __pos;
         765                 :             }
         766                 :           while (__pos-- > 0);
         767                 :         }
         768                 :       return npos;
         769                 :     }
         770                 :
         771                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         772                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         773                 :     basic_string<_CharT, _Traits, _Alloc>::
         774                 :     rfind(_CharT __c, size_type __pos) const
         775                 :     {
         776                 :       size_type __size = this->size();
         777                 :       if (__size)
         778                 :         {
         779                 :           if (--__size > __pos)
         780                 :             __size = __pos;
         781                 :           for (++__size; __size-- > 0; )
         782                 :             if (traits_type::eq(_M_data()[__size], __c))
         783                 :               return __size;
         784                 :         }
         785                 :       return npos;
         786                 :     }
         787                 :
         788                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         789                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         790                 :     basic_string<_CharT, _Traits, _Alloc>::
         791                 :     find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
         792                 :     {
         793                 :       __glibcxx_requires_string_len(__s, __n);
         794                 :       for (; __n && __pos < this->size(); ++__pos)
         795                 :         {
         796                 :           const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
         797                 :           if (__p)
         798                 :             return __pos;
         799                 :         }
         800                 :       return npos;
         801                 :     }
         802                 :
         803                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         804                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         805                 :     basic_string<_CharT, _Traits, _Alloc>::
         806                 :     find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
         807                 :     {
         808                 :       __glibcxx_requires_string_len(__s, __n);
         809                 :       size_type __size = this->size();
         810                 :       if (__size && __n)
         811                 :         {
         812                 :           if (--__size > __pos)
         813                 :             __size = __pos;
         814                 :           do
         815                 :             {
         816                 :               if (traits_type::find(__s, __n, _M_data()[__size]))
         817                 :                 return __size;
         818                 :             }
         819                 :           while (__size-- != 0);
         820                 :         }
         821                 :       return npos;
         822                 :     }
         823                 :
         824                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         825                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         826                 :     basic_string<_CharT, _Traits, _Alloc>::
         827                 :     find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
         828                 :     {
         829                 :       __glibcxx_requires_string_len(__s, __n);
         830                 :       for (; __pos < this->size(); ++__pos)
         831                 :         if (!traits_type::find(__s, __n, _M_data()[__pos]))
         832                 :           return __pos;
         833                 :       return npos;
         834                 :     }
         835                 :
         836                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         837                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         838                 :     basic_string<_CharT, _Traits, _Alloc>::
         839                 :     find_first_not_of(_CharT __c, size_type __pos) const
         840                 :     {
         841                 :       for (; __pos < this->size(); ++__pos)
         842                 :         if (!traits_type::eq(_M_data()[__pos], __c))
         843                 :           return __pos;
         844                 :       return npos;
         845                 :     }
         846                 :
         847                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         848                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         849                 :     basic_string<_CharT, _Traits, _Alloc>::
         850                 :     find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
         851                 :     {
         852                 :       __glibcxx_requires_string_len(__s, __n);
         853                 :       size_type __size = this->size();
         854                 :       if (__size)
         855                 :         {
         856                 :           if (--__size > __pos)
         857                 :             __size = __pos;
         858                 :           do
         859                 :             {
         860                 :               if (!traits_type::find(__s, __n, _M_data()[__size]))
         861                 :                 return __size;
         862                 :             }
         863                 :           while (__size--);
         864                 :         }
         865                 :       return npos;
         866                 :     }
         867                 :
         868                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         869                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
         870                 :     basic_string<_CharT, _Traits, _Alloc>::
         871                 :     find_last_not_of(_CharT __c, size_type __pos) const
         872                 :     {
         873                 :       size_type __size = this->size();
         874                 :       if (__size)
         875                 :         {
         876                 :           if (--__size > __pos)
         877                 :             __size = __pos;
         878                 :           do
         879                 :             {
         880                 :               if (!traits_type::eq(_M_data()[__size], __c))
         881                 :                 return __size;
         882                 :             }
         883                 :           while (__size--);
         884                 :         }
         885                 :       return npos;
         886                 :     }
         887                 :
         888                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         889                 :     int
         890                 :     basic_string<_CharT, _Traits, _Alloc>::
         891                 :     compare(size_type __pos, size_type __n, const basic_string& __str) const
         892                 :     {
         893                 :       _M_check(__pos, "basic_string::compare");
         894                 :       __n = _M_limit(__pos, __n);
         895                 :       const size_type __osize = __str.size();
         896                 :       const size_type __len = std::min(__n, __osize);
         897                 :       int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
         898                 :       if (!__r)
         899                 :         __r = _S_compare(__n, __osize);
         900                 :       return __r;
         901                 :     }
         902                 :
         903                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         904                 :     int
         905                 :     basic_string<_CharT, _Traits, _Alloc>::
         906                 :     compare(size_type __pos1, size_type __n1, const basic_string& __str,
         907                 :             size_type __pos2, size_type __n2) const
         908                 :     {
         909                 :       _M_check(__pos1, "basic_string::compare");
         910                 :       __str._M_check(__pos2, "basic_string::compare");
         911                 :       __n1 = _M_limit(__pos1, __n1);
         912                 :       __n2 = __str._M_limit(__pos2, __n2);
         913                 :       const size_type __len = std::min(__n1, __n2);
         914                 :       int __r = traits_type::compare(_M_data() + __pos1,
         915                 :                                      __str.data() + __pos2, __len);
         916                 :       if (!__r)
         917                 :         __r = _S_compare(__n1, __n2);
         918                 :       return __r;
         919                 :     }
         920                 :
         921                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         922                 :     int
         923                 :     basic_string<_CharT, _Traits, _Alloc>::
         924                 :     compare(const _CharT* __s) const
         925                 :     {
         926                 :       __glibcxx_requires_string(__s);
         927                 :       const size_type __size = this->size();
         928                 :       const size_type __osize = traits_type::length(__s);
         929                 :       const size_type __len = std::min(__size, __osize);
         930                 :       int __r = traits_type::compare(_M_data(), __s, __len);
         931                 :       if (!__r)
         932                 :         __r = _S_compare(__size, __osize);
         933                 :       return __r;
         934                 :     }
         935                 :
         936                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         937                 :     int
         938                 :     basic_string <_CharT, _Traits, _Alloc>::
         939                 :     compare(size_type __pos, size_type __n1, const _CharT* __s) const
         940                 :     {
         941                 :       __glibcxx_requires_string(__s);
         942                 :       _M_check(__pos, "basic_string::compare");
         943                 :       __n1 = _M_limit(__pos, __n1);
         944                 :       const size_type __osize = traits_type::length(__s);
         945                 :       const size_type __len = std::min(__n1, __osize);
         946                 :       int __r = traits_type::compare(_M_data() + __pos, __s, __len);
         947                 :       if (!__r)
         948                 :         __r = _S_compare(__n1, __osize);
         949                 :       return __r;
         950                 :     }
         951                 :
         952                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         953                 :     int
         954                 :     basic_string <_CharT, _Traits, _Alloc>::
         955                 :     compare(size_type __pos, size_type __n1, const _CharT* __s,
         956                 :             size_type __n2) const
         957                 :     {
         958                 :       __glibcxx_requires_string_len(__s, __n2);
         959                 :       _M_check(__pos, "basic_string::compare");
         960                 :       __n1 = _M_limit(__pos, __n1);
         961                 :       const size_type __len = std::min(__n1, __n2);
         962                 :       int __r = traits_type::compare(_M_data() + __pos, __s, __len);
         963                 :       if (!__r)
         964                 :         __r = _S_compare(__n1, __n2);
         965                 :       return __r;
         966                 :     }
         967                 :
         968                 :   // 21.3.7.9 basic_string::getline and operators
         969                 :   template<typename _CharT, typename _Traits, typename _Alloc>
         970                 :     basic_istream<_CharT, _Traits>&
         971                 :     operator>>(basic_istream<_CharT, _Traits>& __in,
         972                 :                basic_string<_CharT, _Traits, _Alloc>& __str)
         973                 :     {
         974                 :       typedef basic_istream<_CharT, _Traits>              __istream_type;
         975                 :       typedef basic_string<_CharT, _Traits, _Alloc>       __string_type;
         976                 :       typedef typename __istream_type::ios_base         __ios_base;
         977                 :       typedef typename __istream_type::int_type         __int_type;
         978                 :       typedef typename __string_type::size_type         __size_type;
         979                 :       typedef ctype<_CharT>                               __ctype_type;
         980                 :       typedef typename __ctype_type::ctype_base         __ctype_base;
         981                 :
         982                 :       __size_type __extracted = 0;
         983                 :       typename __ios_base::iostate __err = __ios_base::goodbit;
         984                 :       typename __istream_type::sentry __cerb(__in, false);
         985                 :       if (__cerb)
         986                 :         {
         987                 :           try
         988                 :             {
         989                 :               // Avoid reallocation for common case.
         990                 :               __str.erase();
         991                 :               _CharT __buf[128];
         992                 :               __size_type __len = 0;
         993                 :               const streamsize __w = __in.width();
         994                 :               const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
         995                 :                                               : __str.max_size();
         996                 :               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
         997                 :               const __int_type __eof = _Traits::eof();
         998                 :               __int_type __c = __in.rdbuf()->sgetc();
         999                 :
        1000                 :               while (__extracted < __n
        1001                 :                      && !_Traits::eq_int_type(__c, __eof)
        1002                 :                      && !__ct.is(__ctype_base::space,
        1003                 :                                  _Traits::to_char_type(__c)))
        1004                 :                 {
        1005                 :                   if (__len == sizeof(__buf) / sizeof(_CharT))
        1006                 :                     {
        1007                 :                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
        1008                 :                       __len = 0;
        1009                 :                     }
        1010                 :                   __buf[__len++] = _Traits::to_char_type(__c);
        1011                 :                   ++__extracted;
        1012                 :                   __c = __in.rdbuf()->snextc();
        1013                 :                 }
        1014                 :               __str.append(__buf, __len);
        1015                 :
        1016                 :               if (_Traits::eq_int_type(__c, __eof))
        1017                 :                 __err |= __ios_base::eofbit;
        1018                 :               __in.width(0);
        1019                 :             }
        1020                 :           catch(__cxxabiv1::__forced_unwind&)
        1021                 :             {
        1022                 :               __in._M_setstate(__ios_base::badbit);
        1023                 :               __throw_exception_again;
        1024                 :             }
        1025                 :           catch(...)
        1026                 :             {
        1027                 :               // _GLIBCXX_RESOLVE_LIB_DEFECTS
        1028                 :               // 91. Description of operator>> and getline() for string<>
        1029                 :               // might cause endless loop
        1030                 :               __in._M_setstate(__ios_base::badbit);
        1031                 :             }
        1032                 :         }
        1033                 :       // 211.  operator>>(istream&, string&) doesn't set failbit
        1034                 :       if (!__extracted)
        1035                 :         __err |= __ios_base::failbit;
        1036                 :       if (__err)
        1037                 :         __in.setstate(__err);
        1038                 :       return __in;
        1039                 :     }
        1040                 :
        1041                 :   template<typename _CharT, typename _Traits, typename _Alloc>
        1042                 :     basic_istream<_CharT, _Traits>&
        1043                 :     getline(basic_istream<_CharT, _Traits>& __in,
        1044                 :             basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
        1045                 :     {
        1046                 :       typedef basic_istream<_CharT, _Traits>              __istream_type;
        1047                 :       typedef basic_string<_CharT, _Traits, _Alloc>       __string_type;
        1048                 :       typedef typename __istream_type::ios_base         __ios_base;
        1049                 :       typedef typename __istream_type::int_type         __int_type;
        1050                 :       typedef typename __string_type::size_type         __size_type;
        1051                 :
        1052                 :       __size_type __extracted = 0;
        1053                 :       const __size_type __n = __str.max_size();
        1054                 :       typename __ios_base::iostate __err = __ios_base::goodbit;
        1055                 :       typename __istream_type::sentry __cerb(__in, true);
        1056                 :       if (__cerb)
        1057                 :         {
        1058                 :           try
        1059                 :             {
        1060                 :               __str.erase();
        1061                 :               const __int_type __idelim = _Traits::to_int_type(__delim);
        1062                 :               const __int_type __eof = _Traits::eof();
        1063                 :               __int_type __c = __in.rdbuf()->sgetc();
        1064                 :
        1065                 :               while (__extracted < __n
        1066                 :                      && !_Traits::eq_int_type(__c, __eof)
        1067                 :                      && !_Traits::eq_int_type(__c, __idelim))
        1068                 :                 {
        1069                 :                   __str += _Traits::to_char_type(__c);
        1070                 :                   ++__extracted;
        1071                 :                   __c = __in.rdbuf()->snextc();
        1072                 :                 }
        1073                 :
        1074                 :               if (_Traits::eq_int_type(__c, __eof))
        1075                 :                 __err |= __ios_base::eofbit;
        1076                 :               else if (_Traits::eq_int_type(__c, __idelim))
        1077                 :                 {
        1078                 :                   ++__extracted;
        1079                 :                   __in.rdbuf()->sbumpc();
        1080                 :                 }
        1081                 :               else
        1082                 :                 __err |= __ios_base::failbit;
        1083                 :             }
        1084                 :           catch(__cxxabiv1::__forced_unwind&)
        1085                 :             {
        1086                 :               __in._M_setstate(__ios_base::badbit);
        1087                 :               __throw_exception_again;
        1088                 :             }
        1089                 :           catch(...)
        1090                 :             {
        1091                 :               // _GLIBCXX_RESOLVE_LIB_DEFECTS
        1092                 :               // 91. Description of operator>> and getline() for string<>
        1093                 :               // might cause endless loop
        1094                 :               __in._M_setstate(__ios_base::badbit);
        1095                 :             }
        1096                 :         }
        1097                 :       if (!__extracted)
        1098                 :         __err |= __ios_base::failbit;
        1099                 :       if (__err)
        1100                 :         __in.setstate(__err);
        1101                 :       return __in;
        1102                 :     }
        1103                 :
        1104                 :   // Inhibit implicit instantiations for required instantiations,
        1105                 :   // which are defined via explicit instantiations elsewhere.
        1106                 :   // NB: This syntax is a GNU extension.
        1107                 : #if _GLIBCXX_EXTERN_TEMPLATE
        1108                 :   extern template class basic_string<char>;
        1109                 :   extern template
        1110                 :     basic_istream<char>&
        1111                 :     operator>>(basic_istream<char>&, string&);
        1112                 :   extern template
        1113                 :     basic_ostream<char>&
        1114                 :     operator<<(basic_ostream<char>&, const string&);
        1115                 :   extern template
        1116                 :     basic_istream<char>&
        1117                 :     getline(basic_istream<char>&, string&, char);
        1118                 :   extern template
        1119                 :     basic_istream<char>&
        1120                 :     getline(basic_istream<char>&, string&);
        1121                 :
        1122                 : #ifdef _GLIBCXX_USE_WCHAR_T
        1123                 :   extern template class basic_string<wchar_t>;
        1124                 :   extern template
        1125                 :     basic_istream<wchar_t>&
        1126                 :     operator>>(basic_istream<wchar_t>&, wstring&);
        1127                 :   extern template
        1128                 :     basic_ostream<wchar_t>&
        1129                 :     operator<<(basic_ostream<wchar_t>&, const wstring&);
        1130                 :   extern template
        1131                 :     basic_istream<wchar_t>&
        1132                 :     getline(basic_istream<wchar_t>&, wstring&, wchar_t);
        1133                 :   extern template
        1134                 :     basic_istream<wchar_t>&
        1135                 :     getline(basic_istream<wchar_t>&, wstring&);
        1136                 : #endif
        1137                 : #endif
        1138                 :
        1139                 : _GLIBCXX_END_NAMESPACE
        1140                 :
        1141                 : #endif

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