LCOV - code coverage report
Current view: directory - tools/gcc-4.5/include/c++/4.5.2/bits - basic_string.tcc (source / functions) Found Hit Coverage
Test: app.info Lines: 376 12 3.2 %
Date: 2012-06-02 Functions: 94 2 2.1 %

       1                 : // Components for manipulating sequences of characters -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
       4                 : // 2006, 2007, 2008, 2009
       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 3, 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                 : // Under Section 7 of GPL version 3, you are granted additional
      19                 : // permissions described in the GCC Runtime Library Exception, version
      20                 : // 3.1, as published by the Free Software Foundation.
      21                 : 
      22                 : // You should have received a copy of the GNU General Public License and
      23                 : // a copy of the GCC Runtime Library Exception along with this program;
      24                 : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      25                 : // <http://www.gnu.org/licenses/>.
      26                 : 
      27                 : /** @file basic_string.tcc
      28                 :  *  This is an internal header file, included by other library headers.
      29                 :  *  You should not attempt to use it directly.
      30                 :  */
      31                 : 
      32                 : //
      33                 : // ISO C++ 14882: 21  Strings library
      34                 : //
      35                 : 
      36                 : // Written by Jason Merrill based upon the specification by Takanori Adachi
      37                 : // in ANSI X3J16/94-0013R2.  Rewritten by Nathan Myers to ISO-14882.
      38                 : 
      39                 : #ifndef _BASIC_STRING_TCC
      40                 : #define _BASIC_STRING_TCC 1
      41                 : 
      42                 : #pragma GCC system_header
      43                 : 
      44                 : #include <cxxabi-forced.h>
      45                 : 
      46                 : _GLIBCXX_BEGIN_NAMESPACE(std)
      47                 : 
      48                 :   template<typename _CharT, typename _Traits, typename _Alloc>
      49                 :     const typename basic_string<_CharT, _Traits, _Alloc>::size_type
      50                 :     basic_string<_CharT, _Traits, _Alloc>::
      51                 :     _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;
      52                 : 
      53                 :   template<typename _CharT, typename _Traits, typename _Alloc>
      54                 :     const _CharT
      55                 :     basic_string<_CharT, _Traits, _Alloc>::
      56                 :     _Rep::_S_terminal = _CharT();
      57                 : 
      58                 :   template<typename _CharT, typename _Traits, typename _Alloc>
      59                 :     const typename basic_string<_CharT, _Traits, _Alloc>::size_type
      60                 :     basic_string<_CharT, _Traits, _Alloc>::npos;
      61                 : 
      62                 :   // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
      63                 :   // at static init time (before static ctors are run).
      64                 :   template<typename _CharT, typename _Traits, typename _Alloc>
      65                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
      66                 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
      67                 :     (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
      68                 :       sizeof(size_type)];
      69                 : 
      70                 :   // NB: This is the special case for Input Iterators, used in
      71                 :   // istreambuf_iterators, etc.
      72                 :   // Input Iterators have a cost structure very different from
      73                 :   // pointers, calling for a different coding style.
      74                 :   template<typename _CharT, typename _Traits, typename _Alloc>
      75                 :     template<typename _InIterator>
      76                 :       _CharT*
      77                 :       basic_string<_CharT, _Traits, _Alloc>::
      78                 :       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
      79                 :                    input_iterator_tag)
      80                 :       {
      81                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
      82                 :         if (__beg == __end && __a == _Alloc())
      83                 :           return _S_empty_rep()._M_refdata();
      84                 : #endif
      85                 :         // Avoid reallocation for common case.
      86                 :         _CharT __buf[128];
      87                 :         size_type __len = 0;
      88                 :         while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
      89                 :           {
      90                 :             __buf[__len++] = *__beg;
      91                 :             ++__beg;
      92                 :           }
      93                 :         _Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
      94                 :         _M_copy(__r->_M_refdata(), __buf, __len);
      95                 :         __try
      96                 :           {
      97                 :             while (__beg != __end)
      98                 :               {
      99                 :                 if (__len == __r->_M_capacity)
     100                 :                   {
     101                 :                     // Allocate more space.
     102                 :                     _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
     103                 :                     _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
     104                 :                     __r->_M_destroy(__a);
     105                 :                     __r = __another;
     106                 :                   }
     107                 :                 __r->_M_refdata()[__len++] = *__beg;
     108                 :                 ++__beg;
     109                 :               }
     110                 :           }
     111                 :         __catch(...)
     112                 :           {
     113                 :             __r->_M_destroy(__a);
     114                 :             __throw_exception_again;
     115                 :           }
     116                 :         __r->_M_set_length_and_sharable(__len);
     117                 :         return __r->_M_refdata();
     118                 :       }
     119                 : 
     120                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     121                 :     template <typename _InIterator>
     122                 :       _CharT*
     123               3 :       basic_string<_CharT, _Traits, _Alloc>::
     124                 :       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
     125                 :                    forward_iterator_tag)
     126                 :       {
     127                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
     128               3 :         if (__beg == __end && __a == _Alloc())
     129               1 :           return _S_empty_rep()._M_refdata();
     130                 : #endif
     131                 :         // NB: Not required, but considered best practice.
     132               2 :         if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
     133               0 :           __throw_logic_error(__N("basic_string::_S_construct NULL not valid"));
     134                 : 
     135                 :         const size_type __dnew = static_cast<size_type>(std::distance(__beg,
     136               2 :                                                                       __end));
     137                 :         // Check for out_of_range and length_error exceptions.
     138               2 :         _Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
     139                 :         __try
     140               2 :           { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
     141                 :         __catch(...)
     142                 :           {
     143                 :             __r->_M_destroy(__a);
     144                 :             __throw_exception_again;
     145                 :           }
     146               2 :         __r->_M_set_length_and_sharable(__dnew);
     147               2 :         return __r->_M_refdata();
     148                 :       }
     149                 : 
     150                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     151                 :     _CharT*
     152               0 :     basic_string<_CharT, _Traits, _Alloc>::
     153                 :     _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
     154                 :     {
     155                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
     156               0 :       if (__n == 0 && __a == _Alloc())
     157               0 :         return _S_empty_rep()._M_refdata();
     158                 : #endif
     159                 :       // Check for out_of_range and length_error exceptions.
     160               0 :       _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
     161               0 :       if (__n)
     162               0 :         _M_assign(__r->_M_refdata(), __n, __c);
     163                 : 
     164               0 :       __r->_M_set_length_and_sharable(__n);
     165               0 :       return __r->_M_refdata();
     166                 :     }
     167                 : 
     168                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     169               0 :     basic_string<_CharT, _Traits, _Alloc>::
     170                 :     basic_string(const basic_string& __str)
     171                 :     : _M_dataplus(__str._M_rep()->_M_grab(_Alloc(__str.get_allocator()),
     172                 :                                           __str.get_allocator()),
     173               0 :                   __str.get_allocator())
     174               0 :     { }
     175                 : 
     176                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     177               0 :     basic_string<_CharT, _Traits, _Alloc>::
     178                 :     basic_string(const _Alloc& __a)
     179               0 :     : _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
     180               0 :     { }
     181                 : 
     182                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     183               0 :     basic_string<_CharT, _Traits, _Alloc>::
     184                 :     basic_string(const basic_string& __str, size_type __pos, size_type __n)
     185                 :     : _M_dataplus(_S_construct(__str._M_data()
     186                 :                                + __str._M_check(__pos,
     187                 :                                                 "basic_string::basic_string"),
     188                 :                                __str._M_data() + __str._M_limit(__pos, __n)
     189               0 :                                + __pos, _Alloc()), _Alloc())
     190               0 :     { }
     191                 : 
     192                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     193               0 :     basic_string<_CharT, _Traits, _Alloc>::
     194                 :     basic_string(const basic_string& __str, size_type __pos,
     195                 :                  size_type __n, const _Alloc& __a)
     196                 :     : _M_dataplus(_S_construct(__str._M_data()
     197                 :                                + __str._M_check(__pos,
     198                 :                                                 "basic_string::basic_string"),
     199                 :                                __str._M_data() + __str._M_limit(__pos, __n)
     200               0 :                                + __pos, __a), __a)
     201               0 :     { }
     202                 : 
     203                 :   // TBD: DPG annotate
     204                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     205               0 :     basic_string<_CharT, _Traits, _Alloc>::
     206                 :     basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
     207               0 :     : _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
     208               0 :     { }
     209                 : 
     210                 :   // TBD: DPG annotate
     211                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     212               0 :     basic_string<_CharT, _Traits, _Alloc>::
     213                 :     basic_string(const _CharT* __s, const _Alloc& __a)
     214                 :     : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
     215               0 :                                __s + npos, __a), __a)
     216               0 :     { }
     217                 : 
     218                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     219               0 :     basic_string<_CharT, _Traits, _Alloc>::
     220                 :     basic_string(size_type __n, _CharT __c, const _Alloc& __a)
     221               0 :     : _M_dataplus(_S_construct(__n, __c, __a), __a)
     222               0 :     { }
     223                 : 
     224                 :   // TBD: DPG annotate
     225                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     226                 :     template<typename _InputIterator>
     227               3 :     basic_string<_CharT, _Traits, _Alloc>::
     228                 :     basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a)
     229               3 :     : _M_dataplus(_S_construct(__beg, __end, __a), __a)
     230               3 :     { }
     231                 : 
     232                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
     233                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     234               0 :     basic_string<_CharT, _Traits, _Alloc>::
     235                 :     basic_string(initializer_list<_CharT> __l, const _Alloc& __a)
     236               0 :     : _M_dataplus(_S_construct(__l.begin(), __l.end(), __a), __a)
     237               0 :     { }
     238                 : #endif
     239                 : 
     240                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     241                 :     basic_string<_CharT, _Traits, _Alloc>&
     242               0 :     basic_string<_CharT, _Traits, _Alloc>::
     243                 :     assign(const basic_string& __str)
     244                 :     {
     245               0 :       if (_M_rep() != __str._M_rep())
     246                 :         {
     247                 :           // XXX MT
     248               0 :           const allocator_type __a = this->get_allocator();
     249               0 :           _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
     250               0 :           _M_rep()->_M_dispose(__a);
     251               0 :           _M_data(__tmp);
     252                 :         }
     253               0 :       return *this;
     254                 :     }
     255                 : 
     256                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     257                 :     basic_string<_CharT, _Traits, _Alloc>&
     258               0 :     basic_string<_CharT, _Traits, _Alloc>::
     259                 :     assign(const _CharT* __s, size_type __n)
     260                 :     {
     261                 :       __glibcxx_requires_string_len(__s, __n);
     262               0 :       _M_check_length(this->size(), __n, "basic_string::assign");
     263               0 :       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
     264               0 :         return _M_replace_safe(size_type(0), this->size(), __s, __n);
     265                 :       else
     266                 :         {
     267                 :           // Work in-place.
     268               0 :           const size_type __pos = __s - _M_data();
     269               0 :           if (__pos >= __n)
     270               0 :             _M_copy(_M_data(), __s, __n);
     271               0 :           else if (__pos)
     272               0 :             _M_move(_M_data(), __s, __n);
     273               0 :           _M_rep()->_M_set_length_and_sharable(__n);
     274               0 :           return *this;
     275                 :         }
     276                 :      }
     277                 : 
     278                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     279                 :     basic_string<_CharT, _Traits, _Alloc>&
     280               0 :     basic_string<_CharT, _Traits, _Alloc>::
     281                 :     append(size_type __n, _CharT __c)
     282                 :     {
     283               0 :       if (__n)
     284                 :         {
     285               0 :           _M_check_length(size_type(0), __n, "basic_string::append");   
     286               0 :           const size_type __len = __n + this->size();
     287               0 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
     288               0 :             this->reserve(__len);
     289               0 :           _M_assign(_M_data() + this->size(), __n, __c);
     290               0 :           _M_rep()->_M_set_length_and_sharable(__len);
     291                 :         }
     292               0 :       return *this;
     293                 :     }
     294                 : 
     295                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     296                 :     basic_string<_CharT, _Traits, _Alloc>&
     297               0 :     basic_string<_CharT, _Traits, _Alloc>::
     298                 :     append(const _CharT* __s, size_type __n)
     299                 :     {
     300                 :       __glibcxx_requires_string_len(__s, __n);
     301               0 :       if (__n)
     302                 :         {
     303               0 :           _M_check_length(size_type(0), __n, "basic_string::append");
     304               0 :           const size_type __len = __n + this->size();
     305               0 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
     306                 :             {
     307               0 :               if (_M_disjunct(__s))
     308               0 :                 this->reserve(__len);
     309                 :               else
     310                 :                 {
     311               0 :                   const size_type __off = __s - _M_data();
     312               0 :                   this->reserve(__len);
     313               0 :                   __s = _M_data() + __off;
     314                 :                 }
     315                 :             }
     316               0 :           _M_copy(_M_data() + this->size(), __s, __n);
     317               0 :           _M_rep()->_M_set_length_and_sharable(__len);
     318                 :         }
     319               0 :       return *this;
     320                 :     }
     321                 : 
     322                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     323                 :     basic_string<_CharT, _Traits, _Alloc>&
     324               0 :     basic_string<_CharT, _Traits, _Alloc>::
     325                 :     append(const basic_string& __str)
     326                 :     {
     327               0 :       const size_type __size = __str.size();
     328               0 :       if (__size)
     329                 :         {
     330               0 :           const size_type __len = __size + this->size();
     331               0 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
     332               0 :             this->reserve(__len);
     333               0 :           _M_copy(_M_data() + this->size(), __str._M_data(), __size);
     334               0 :           _M_rep()->_M_set_length_and_sharable(__len);
     335                 :         }
     336               0 :       return *this;
     337                 :     }    
     338                 : 
     339                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     340                 :     basic_string<_CharT, _Traits, _Alloc>&
     341               0 :     basic_string<_CharT, _Traits, _Alloc>::
     342                 :     append(const basic_string& __str, size_type __pos, size_type __n)
     343                 :     {
     344               0 :       __str._M_check(__pos, "basic_string::append");
     345               0 :       __n = __str._M_limit(__pos, __n);
     346               0 :       if (__n)
     347                 :         {
     348               0 :           const size_type __len = __n + this->size();
     349               0 :           if (__len > this->capacity() || _M_rep()->_M_is_shared())
     350               0 :             this->reserve(__len);
     351               0 :           _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
     352               0 :           _M_rep()->_M_set_length_and_sharable(__len);         
     353                 :         }
     354               0 :       return *this;
     355                 :     }
     356                 : 
     357                 :    template<typename _CharT, typename _Traits, typename _Alloc>
     358                 :      basic_string<_CharT, _Traits, _Alloc>&
     359               0 :      basic_string<_CharT, _Traits, _Alloc>::
     360                 :      insert(size_type __pos, const _CharT* __s, size_type __n)
     361                 :      {
     362                 :        __glibcxx_requires_string_len(__s, __n);
     363               0 :        _M_check(__pos, "basic_string::insert");
     364               0 :        _M_check_length(size_type(0), __n, "basic_string::insert");
     365               0 :        if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
     366               0 :          return _M_replace_safe(__pos, size_type(0), __s, __n);
     367                 :        else
     368                 :          {
     369                 :            // Work in-place.
     370               0 :            const size_type __off = __s - _M_data();
     371               0 :            _M_mutate(__pos, 0, __n);
     372               0 :            __s = _M_data() + __off;
     373               0 :            _CharT* __p = _M_data() + __pos;
     374               0 :            if (__s  + __n <= __p)
     375               0 :              _M_copy(__p, __s, __n);
     376               0 :            else if (__s >= __p)
     377               0 :              _M_copy(__p, __s + __n, __n);
     378                 :            else
     379                 :              {
     380               0 :                const size_type __nleft = __p - __s;
     381               0 :                _M_copy(__p, __s, __nleft);
     382               0 :                _M_copy(__p + __nleft, __p + __n, __n - __nleft);
     383                 :              }
     384               0 :            return *this;
     385                 :          }
     386                 :      }
     387                 : 
     388                 :    template<typename _CharT, typename _Traits, typename _Alloc>
     389                 :      typename basic_string<_CharT, _Traits, _Alloc>::iterator
     390               0 :      basic_string<_CharT, _Traits, _Alloc>::
     391                 :      erase(iterator __first, iterator __last)
     392                 :      {
     393                 :        _GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
     394                 :                                 && __last <= _M_iend());
     395                 : 
     396                 :        // NB: This isn't just an optimization (bail out early when
     397                 :        // there is nothing to do, really), it's also a correctness
     398                 :        // issue vs MT, see libstdc++/40518.
     399               0 :        const size_type __size = __last - __first;
     400               0 :        if (__size)
     401                 :          {
     402               0 :            const size_type __pos = __first - _M_ibegin();
     403               0 :            _M_mutate(__pos, __size, size_type(0));
     404               0 :            _M_rep()->_M_set_leaked();
     405               0 :            return iterator(_M_data() + __pos);
     406                 :          }
     407                 :        else
     408               0 :          return __first;
     409                 :      }
     410                 : 
     411                 :    template<typename _CharT, typename _Traits, typename _Alloc>
     412                 :      basic_string<_CharT, _Traits, _Alloc>&
     413               0 :      basic_string<_CharT, _Traits, _Alloc>::
     414                 :      replace(size_type __pos, size_type __n1, const _CharT* __s,
     415                 :              size_type __n2)
     416                 :      {
     417                 :        __glibcxx_requires_string_len(__s, __n2);
     418               0 :        _M_check(__pos, "basic_string::replace");
     419               0 :        __n1 = _M_limit(__pos, __n1);
     420               0 :        _M_check_length(__n1, __n2, "basic_string::replace");
     421                 :        bool __left;
     422               0 :        if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
     423               0 :          return _M_replace_safe(__pos, __n1, __s, __n2);
     424               0 :        else if ((__left = __s + __n2 <= _M_data() + __pos)
     425                 :                 || _M_data() + __pos + __n1 <= __s)
     426                 :          {
     427                 :            // Work in-place: non-overlapping case.
     428               0 :            size_type __off = __s - _M_data();
     429               0 :            __left ? __off : (__off += __n2 - __n1);
     430               0 :            _M_mutate(__pos, __n1, __n2);
     431               0 :            _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
     432               0 :            return *this;
     433                 :          }
     434                 :        else
     435                 :          {
     436                 :            // Todo: overlapping case.
     437               0 :            const basic_string __tmp(__s, __n2);
     438               0 :            return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
     439                 :          }
     440                 :      }
     441                 : 
     442                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     443                 :     void
     444               0 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
     445                 :     _M_destroy(const _Alloc& __a) throw ()
     446                 :     {
     447                 :       const size_type __size = sizeof(_Rep_base) +
     448               0 :                                (this->_M_capacity + 1) * sizeof(_CharT);
     449               0 :       _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
     450               0 :     }
     451                 : 
     452                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     453                 :     void
     454               0 :     basic_string<_CharT, _Traits, _Alloc>::
     455                 :     _M_leak_hard()
     456                 :     {
     457                 : #ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
     458               0 :       if (_M_rep() == &_S_empty_rep())
     459               0 :         return;
     460                 : #endif
     461               0 :       if (_M_rep()->_M_is_shared())
     462               0 :         _M_mutate(0, 0, 0);
     463               0 :       _M_rep()->_M_set_leaked();
     464                 :     }
     465                 : 
     466                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     467                 :     void
     468               0 :     basic_string<_CharT, _Traits, _Alloc>::
     469                 :     _M_mutate(size_type __pos, size_type __len1, size_type __len2)
     470                 :     {
     471               0 :       const size_type __old_size = this->size();
     472               0 :       const size_type __new_size = __old_size + __len2 - __len1;
     473               0 :       const size_type __how_much = __old_size - __pos - __len1;
     474                 : 
     475               0 :       if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
     476                 :         {
     477                 :           // Must reallocate.
     478               0 :           const allocator_type __a = get_allocator();
     479               0 :           _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);
     480                 : 
     481               0 :           if (__pos)
     482               0 :             _M_copy(__r->_M_refdata(), _M_data(), __pos);
     483               0 :           if (__how_much)
     484               0 :             _M_copy(__r->_M_refdata() + __pos + __len2,
     485                 :                     _M_data() + __pos + __len1, __how_much);
     486                 : 
     487               0 :           _M_rep()->_M_dispose(__a);
     488               0 :           _M_data(__r->_M_refdata());
     489                 :         }
     490               0 :       else if (__how_much && __len1 != __len2)
     491                 :         {
     492                 :           // Work in-place.
     493               0 :           _M_move(_M_data() + __pos + __len2,
     494                 :                   _M_data() + __pos + __len1, __how_much);
     495                 :         }
     496               0 :       _M_rep()->_M_set_length_and_sharable(__new_size);
     497               0 :     }
     498                 : 
     499                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     500                 :     void
     501               0 :     basic_string<_CharT, _Traits, _Alloc>::
     502                 :     reserve(size_type __res)
     503                 :     {
     504               0 :       if (__res != this->capacity() || _M_rep()->_M_is_shared())
     505                 :         {
     506                 :           // Make sure we don't shrink below the current size
     507               0 :           if (__res < this->size())
     508               0 :             __res = this->size();
     509               0 :           const allocator_type __a = get_allocator();
     510               0 :           _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
     511               0 :           _M_rep()->_M_dispose(__a);
     512               0 :           _M_data(__tmp);
     513                 :         }
     514               0 :     }
     515                 : 
     516                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     517                 :     void
     518               0 :     basic_string<_CharT, _Traits, _Alloc>::
     519                 :     swap(basic_string& __s)
     520                 :     {
     521               0 :       if (_M_rep()->_M_is_leaked())
     522               0 :         _M_rep()->_M_set_sharable();
     523               0 :       if (__s._M_rep()->_M_is_leaked())
     524               0 :         __s._M_rep()->_M_set_sharable();
     525               0 :       if (this->get_allocator() == __s.get_allocator())
     526                 :         {
     527               0 :           _CharT* __tmp = _M_data();
     528               0 :           _M_data(__s._M_data());
     529               0 :           __s._M_data(__tmp);
     530                 :         }
     531                 :       // The code below can usually be optimized away.
     532                 :       else
     533                 :         {
     534                 :           const basic_string __tmp1(_M_ibegin(), _M_iend(),
     535               0 :                                     __s.get_allocator());
     536                 :           const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
     537               0 :                                     this->get_allocator());
     538               0 :           *this = __tmp2;
     539               0 :           __s = __tmp1;
     540                 :         }
     541               0 :     }
     542                 : 
     543                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     544                 :     typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
     545               0 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
     546                 :     _S_create(size_type __capacity, size_type __old_capacity,
     547                 :               const _Alloc& __alloc)
     548                 :     {
     549                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     550                 :       // 83.  String::npos vs. string::max_size()
     551               0 :       if (__capacity > _S_max_size)
     552               0 :         __throw_length_error(__N("basic_string::_S_create"));
     553                 : 
     554                 :       // The standard places no restriction on allocating more memory
     555                 :       // than is strictly needed within this layer at the moment or as
     556                 :       // requested by an explicit application call to reserve().
     557                 : 
     558                 :       // Many malloc implementations perform quite poorly when an
     559                 :       // application attempts to allocate memory in a stepwise fashion
     560                 :       // growing each allocation size by only 1 char.  Additionally,
     561                 :       // it makes little sense to allocate less linear memory than the
     562                 :       // natural blocking size of the malloc implementation.
     563                 :       // Unfortunately, we would need a somewhat low-level calculation
     564                 :       // with tuned parameters to get this perfect for any particular
     565                 :       // malloc implementation.  Fortunately, generalizations about
     566                 :       // common features seen among implementations seems to suffice.
     567                 : 
     568                 :       // __pagesize need not match the actual VM page size for good
     569                 :       // results in practice, thus we pick a common value on the low
     570                 :       // side.  __malloc_header_size is an estimate of the amount of
     571                 :       // overhead per memory allocation (in practice seen N * sizeof
     572                 :       // (void*) where N is 0, 2 or 4).  According to folklore,
     573                 :       // picking this value on the high side is better than
     574                 :       // low-balling it (especially when this algorithm is used with
     575                 :       // malloc implementations that allocate memory blocks rounded up
     576                 :       // to a size which is a power of 2).
     577               0 :       const size_type __pagesize = 4096;
     578               0 :       const size_type __malloc_header_size = 4 * sizeof(void*);
     579                 : 
     580                 :       // The below implements an exponential growth policy, necessary to
     581                 :       // meet amortized linear time requirements of the library: see
     582                 :       // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
     583                 :       // It's active for allocations requiring an amount of memory above
     584                 :       // system pagesize. This is consistent with the requirements of the
     585                 :       // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
     586               0 :       if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
     587               0 :         __capacity = 2 * __old_capacity;
     588                 : 
     589                 :       // NB: Need an array of char_type[__capacity], plus a terminating
     590                 :       // null char_type() element, plus enough for the _Rep data structure.
     591                 :       // Whew. Seemingly so needy, yet so elemental.
     592               0 :       size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
     593                 : 
     594               0 :       const size_type __adj_size = __size + __malloc_header_size;
     595               0 :       if (__adj_size > __pagesize && __capacity > __old_capacity)
     596                 :         {
     597               0 :           const size_type __extra = __pagesize - __adj_size % __pagesize;
     598               0 :           __capacity += __extra / sizeof(_CharT);
     599                 :           // Never allocate a string bigger than _S_max_size.
     600               0 :           if (__capacity > _S_max_size)
     601               0 :             __capacity = _S_max_size;
     602               0 :           __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
     603                 :         }
     604                 : 
     605                 :       // NB: Might throw, but no worries about a leak, mate: _Rep()
     606                 :       // does not throw.
     607               0 :       void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
     608               0 :       _Rep *__p = new (__place) _Rep;
     609               0 :       __p->_M_capacity = __capacity;
     610                 :       // ABI compatibility - 3.4.x set in _S_create both
     611                 :       // _M_refcount and _M_length.  All callers of _S_create
     612                 :       // in basic_string.tcc then set just _M_length.
     613                 :       // In 4.0.x and later both _M_refcount and _M_length
     614                 :       // are initialized in the callers, unfortunately we can
     615                 :       // have 3.4.x compiled code with _S_create callers inlined
     616                 :       // calling 4.0.x+ _S_create.
     617               0 :       __p->_M_set_sharable();
     618               0 :       return __p;
     619                 :     }
     620                 : 
     621                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     622                 :     _CharT*
     623               0 :     basic_string<_CharT, _Traits, _Alloc>::_Rep::
     624                 :     _M_clone(const _Alloc& __alloc, size_type __res)
     625                 :     {
     626                 :       // Requested capacity of the clone.
     627               0 :       const size_type __requested_cap = this->_M_length + __res;
     628                 :       _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
     629               0 :                                   __alloc);
     630               0 :       if (this->_M_length)
     631               0 :         _M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);
     632                 : 
     633               0 :       __r->_M_set_length_and_sharable(this->_M_length);
     634               0 :       return __r->_M_refdata();
     635                 :     }
     636                 : 
     637                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     638                 :     void
     639               0 :     basic_string<_CharT, _Traits, _Alloc>::
     640                 :     resize(size_type __n, _CharT __c)
     641                 :     {
     642               0 :       const size_type __size = this->size();
     643               0 :       _M_check_length(__size, __n, "basic_string::resize");
     644               0 :       if (__size < __n)
     645               0 :         this->append(__n - __size, __c);
     646               0 :       else if (__n < __size)
     647               0 :         this->erase(__n);
     648                 :       // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
     649               0 :     }
     650                 : 
     651                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     652                 :     template<typename _InputIterator>
     653                 :       basic_string<_CharT, _Traits, _Alloc>&
     654                 :       basic_string<_CharT, _Traits, _Alloc>::
     655                 :       _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
     656                 :                           _InputIterator __k2, __false_type)
     657                 :       {
     658                 :         const basic_string __s(__k1, __k2);
     659                 :         const size_type __n1 = __i2 - __i1;
     660                 :         _M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
     661                 :         return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
     662                 :                                __s.size());
     663                 :       }
     664                 : 
     665                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     666                 :     basic_string<_CharT, _Traits, _Alloc>&
     667               0 :     basic_string<_CharT, _Traits, _Alloc>::
     668                 :     _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
     669                 :                    _CharT __c)
     670                 :     {
     671               0 :       _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
     672               0 :       _M_mutate(__pos1, __n1, __n2);
     673               0 :       if (__n2)
     674               0 :         _M_assign(_M_data() + __pos1, __n2, __c);
     675               0 :       return *this;
     676                 :     }
     677                 : 
     678                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     679                 :     basic_string<_CharT, _Traits, _Alloc>&
     680               0 :     basic_string<_CharT, _Traits, _Alloc>::
     681                 :     _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
     682                 :                     size_type __n2)
     683                 :     {
     684               0 :       _M_mutate(__pos1, __n1, __n2);
     685               0 :       if (__n2)
     686               0 :         _M_copy(_M_data() + __pos1, __s, __n2);
     687               0 :       return *this;
     688                 :     }
     689                 :    
     690                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     691                 :     basic_string<_CharT, _Traits, _Alloc>
     692                 :     operator+(const _CharT* __lhs,
     693               0 :               const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     694                 :     {
     695                 :       __glibcxx_requires_string(__lhs);
     696                 :       typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
     697                 :       typedef typename __string_type::size_type   __size_type;
     698               0 :       const __size_type __len = _Traits::length(__lhs);
     699               0 :       __string_type __str;
     700               0 :       __str.reserve(__len + __rhs.size());
     701               0 :       __str.append(__lhs, __len);
     702               0 :       __str.append(__rhs);
     703                 :       return __str;
     704                 :     }
     705                 : 
     706                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     707                 :     basic_string<_CharT, _Traits, _Alloc>
     708                 :     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     709                 :     {
     710                 :       typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
     711                 :       typedef typename __string_type::size_type   __size_type;
     712                 :       __string_type __str;
     713                 :       const __size_type __len = __rhs.size();
     714                 :       __str.reserve(__len + 1);
     715                 :       __str.append(__size_type(1), __lhs);
     716                 :       __str.append(__rhs);
     717                 :       return __str;
     718                 :     }
     719                 : 
     720                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     721                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     722               0 :     basic_string<_CharT, _Traits, _Alloc>::
     723                 :     copy(_CharT* __s, size_type __n, size_type __pos) const
     724                 :     {
     725               0 :       _M_check(__pos, "basic_string::copy");
     726               0 :       __n = _M_limit(__pos, __n);
     727                 :       __glibcxx_requires_string_len(__s, __n);
     728               0 :       if (__n)
     729               0 :         _M_copy(__s, _M_data() + __pos, __n);
     730                 :       // 21.3.5.7 par 3: do not append null.  (good.)
     731               0 :       return __n;
     732                 :     }
     733                 : 
     734                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     735                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     736               0 :     basic_string<_CharT, _Traits, _Alloc>::
     737                 :     find(const _CharT* __s, size_type __pos, size_type __n) const
     738                 :     {
     739                 :       __glibcxx_requires_string_len(__s, __n);
     740               0 :       const size_type __size = this->size();
     741               0 :       const _CharT* __data = _M_data();
     742                 : 
     743               0 :       if (__n == 0)
     744               0 :         return __pos <= __size ? __pos : npos;
     745                 : 
     746               0 :       if (__n <= __size)
     747                 :         {
     748               0 :           for (; __pos <= __size - __n; ++__pos)
     749               0 :             if (traits_type::eq(__data[__pos], __s[0])
     750                 :                 && traits_type::compare(__data + __pos + 1,
     751                 :                                         __s + 1, __n - 1) == 0)
     752               0 :               return __pos;
     753                 :         }
     754               0 :       return npos;
     755                 :     }
     756                 : 
     757                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     758                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     759               0 :     basic_string<_CharT, _Traits, _Alloc>::
     760                 :     find(_CharT __c, size_type __pos) const
     761                 :     {
     762               0 :       size_type __ret = npos;
     763               0 :       const size_type __size = this->size();
     764               0 :       if (__pos < __size)
     765                 :         {
     766               0 :           const _CharT* __data = _M_data();
     767               0 :           const size_type __n = __size - __pos;
     768               0 :           const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
     769               0 :           if (__p)
     770               0 :             __ret = __p - __data;
     771                 :         }
     772               0 :       return __ret;
     773                 :     }
     774                 : 
     775                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     776                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     777               0 :     basic_string<_CharT, _Traits, _Alloc>::
     778                 :     rfind(const _CharT* __s, size_type __pos, size_type __n) const
     779                 :     {
     780                 :       __glibcxx_requires_string_len(__s, __n);
     781               0 :       const size_type __size = this->size();
     782               0 :       if (__n <= __size)
     783                 :         {
     784               0 :           __pos = std::min(size_type(__size - __n), __pos);
     785               0 :           const _CharT* __data = _M_data();
     786               0 :           do
     787                 :             {
     788               0 :               if (traits_type::compare(__data + __pos, __s, __n) == 0)
     789               0 :                 return __pos;
     790                 :             }
     791                 :           while (__pos-- > 0);
     792                 :         }
     793               0 :       return npos;
     794                 :     }
     795                 : 
     796                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     797                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     798               0 :     basic_string<_CharT, _Traits, _Alloc>::
     799                 :     rfind(_CharT __c, size_type __pos) const
     800                 :     {
     801               0 :       size_type __size = this->size();
     802               0 :       if (__size)
     803                 :         {
     804               0 :           if (--__size > __pos)
     805               0 :             __size = __pos;
     806               0 :           for (++__size; __size-- > 0; )
     807               0 :             if (traits_type::eq(_M_data()[__size], __c))
     808               0 :               return __size;
     809                 :         }
     810               0 :       return npos;
     811                 :     }
     812                 : 
     813                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     814                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     815               0 :     basic_string<_CharT, _Traits, _Alloc>::
     816                 :     find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
     817                 :     {
     818                 :       __glibcxx_requires_string_len(__s, __n);
     819               0 :       for (; __n && __pos < this->size(); ++__pos)
     820                 :         {
     821               0 :           const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
     822               0 :           if (__p)
     823               0 :             return __pos;
     824                 :         }
     825               0 :       return npos;
     826                 :     }
     827                 : 
     828                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     829                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     830               0 :     basic_string<_CharT, _Traits, _Alloc>::
     831                 :     find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
     832                 :     {
     833                 :       __glibcxx_requires_string_len(__s, __n);
     834               0 :       size_type __size = this->size();
     835               0 :       if (__size && __n)
     836                 :         {
     837               0 :           if (--__size > __pos)
     838               0 :             __size = __pos;
     839               0 :           do
     840                 :             {
     841               0 :               if (traits_type::find(__s, __n, _M_data()[__size]))
     842               0 :                 return __size;
     843                 :             }
     844                 :           while (__size-- != 0);
     845                 :         }
     846               0 :       return npos;
     847                 :     }
     848                 : 
     849                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     850                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     851               0 :     basic_string<_CharT, _Traits, _Alloc>::
     852                 :     find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
     853                 :     {
     854                 :       __glibcxx_requires_string_len(__s, __n);
     855               0 :       for (; __pos < this->size(); ++__pos)
     856               0 :         if (!traits_type::find(__s, __n, _M_data()[__pos]))
     857               0 :           return __pos;
     858               0 :       return npos;
     859                 :     }
     860                 : 
     861                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     862                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     863               0 :     basic_string<_CharT, _Traits, _Alloc>::
     864                 :     find_first_not_of(_CharT __c, size_type __pos) const
     865                 :     {
     866               0 :       for (; __pos < this->size(); ++__pos)
     867               0 :         if (!traits_type::eq(_M_data()[__pos], __c))
     868               0 :           return __pos;
     869               0 :       return npos;
     870                 :     }
     871                 : 
     872                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     873                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     874               0 :     basic_string<_CharT, _Traits, _Alloc>::
     875                 :     find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
     876                 :     {
     877                 :       __glibcxx_requires_string_len(__s, __n);
     878               0 :       size_type __size = this->size();
     879               0 :       if (__size)
     880                 :         {
     881               0 :           if (--__size > __pos)
     882               0 :             __size = __pos;
     883               0 :           do
     884                 :             {
     885               0 :               if (!traits_type::find(__s, __n, _M_data()[__size]))
     886               0 :                 return __size;
     887                 :             }
     888                 :           while (__size--);
     889                 :         }
     890               0 :       return npos;
     891                 :     }
     892                 : 
     893                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     894                 :     typename basic_string<_CharT, _Traits, _Alloc>::size_type
     895               0 :     basic_string<_CharT, _Traits, _Alloc>::
     896                 :     find_last_not_of(_CharT __c, size_type __pos) const
     897                 :     {
     898               0 :       size_type __size = this->size();
     899               0 :       if (__size)
     900                 :         {
     901               0 :           if (--__size > __pos)
     902               0 :             __size = __pos;
     903               0 :           do
     904                 :             {
     905               0 :               if (!traits_type::eq(_M_data()[__size], __c))
     906               0 :                 return __size;
     907                 :             }
     908                 :           while (__size--);
     909                 :         }
     910               0 :       return npos;
     911                 :     }
     912                 : 
     913                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     914                 :     int
     915               0 :     basic_string<_CharT, _Traits, _Alloc>::
     916                 :     compare(size_type __pos, size_type __n, const basic_string& __str) const
     917                 :     {
     918               0 :       _M_check(__pos, "basic_string::compare");
     919               0 :       __n = _M_limit(__pos, __n);
     920               0 :       const size_type __osize = __str.size();
     921               0 :       const size_type __len = std::min(__n, __osize);
     922               0 :       int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
     923               0 :       if (!__r)
     924               0 :         __r = _S_compare(__n, __osize);
     925               0 :       return __r;
     926                 :     }
     927                 : 
     928                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     929                 :     int
     930               0 :     basic_string<_CharT, _Traits, _Alloc>::
     931                 :     compare(size_type __pos1, size_type __n1, const basic_string& __str,
     932                 :             size_type __pos2, size_type __n2) const
     933                 :     {
     934               0 :       _M_check(__pos1, "basic_string::compare");
     935               0 :       __str._M_check(__pos2, "basic_string::compare");
     936               0 :       __n1 = _M_limit(__pos1, __n1);
     937               0 :       __n2 = __str._M_limit(__pos2, __n2);
     938               0 :       const size_type __len = std::min(__n1, __n2);
     939                 :       int __r = traits_type::compare(_M_data() + __pos1,
     940               0 :                                      __str.data() + __pos2, __len);
     941               0 :       if (!__r)
     942               0 :         __r = _S_compare(__n1, __n2);
     943               0 :       return __r;
     944                 :     }
     945                 : 
     946                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     947                 :     int
     948               0 :     basic_string<_CharT, _Traits, _Alloc>::
     949                 :     compare(const _CharT* __s) const
     950                 :     {
     951                 :       __glibcxx_requires_string(__s);
     952               0 :       const size_type __size = this->size();
     953               0 :       const size_type __osize = traits_type::length(__s);
     954               0 :       const size_type __len = std::min(__size, __osize);
     955               0 :       int __r = traits_type::compare(_M_data(), __s, __len);
     956               0 :       if (!__r)
     957               0 :         __r = _S_compare(__size, __osize);
     958               0 :       return __r;
     959                 :     }
     960                 : 
     961                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     962                 :     int
     963               0 :     basic_string <_CharT, _Traits, _Alloc>::
     964                 :     compare(size_type __pos, size_type __n1, const _CharT* __s) const
     965                 :     {
     966                 :       __glibcxx_requires_string(__s);
     967               0 :       _M_check(__pos, "basic_string::compare");
     968               0 :       __n1 = _M_limit(__pos, __n1);
     969               0 :       const size_type __osize = traits_type::length(__s);
     970               0 :       const size_type __len = std::min(__n1, __osize);
     971               0 :       int __r = traits_type::compare(_M_data() + __pos, __s, __len);
     972               0 :       if (!__r)
     973               0 :         __r = _S_compare(__n1, __osize);
     974               0 :       return __r;
     975                 :     }
     976                 : 
     977                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     978                 :     int
     979               0 :     basic_string <_CharT, _Traits, _Alloc>::
     980                 :     compare(size_type __pos, size_type __n1, const _CharT* __s,
     981                 :             size_type __n2) const
     982                 :     {
     983                 :       __glibcxx_requires_string_len(__s, __n2);
     984               0 :       _M_check(__pos, "basic_string::compare");
     985               0 :       __n1 = _M_limit(__pos, __n1);
     986               0 :       const size_type __len = std::min(__n1, __n2);
     987               0 :       int __r = traits_type::compare(_M_data() + __pos, __s, __len);
     988               0 :       if (!__r)
     989               0 :         __r = _S_compare(__n1, __n2);
     990               0 :       return __r;
     991                 :     }
     992                 : 
     993                 :   // 21.3.7.9 basic_string::getline and operators
     994                 :   template<typename _CharT, typename _Traits, typename _Alloc>
     995                 :     basic_istream<_CharT, _Traits>&
     996                 :     operator>>(basic_istream<_CharT, _Traits>& __in,
     997                 :                basic_string<_CharT, _Traits, _Alloc>& __str)
     998                 :     {
     999                 :       typedef basic_istream<_CharT, _Traits>              __istream_type;
    1000                 :       typedef basic_string<_CharT, _Traits, _Alloc>       __string_type;
    1001                 :       typedef typename __istream_type::ios_base         __ios_base;
    1002                 :       typedef typename __istream_type::int_type         __int_type;
    1003                 :       typedef typename __string_type::size_type         __size_type;
    1004                 :       typedef ctype<_CharT>                               __ctype_type;
    1005                 :       typedef typename __ctype_type::ctype_base         __ctype_base;
    1006                 : 
    1007                 :       __size_type __extracted = 0;
    1008                 :       typename __ios_base::iostate __err = __ios_base::goodbit;
    1009                 :       typename __istream_type::sentry __cerb(__in, false);
    1010                 :       if (__cerb)
    1011                 :         {
    1012                 :           __try
    1013                 :             {
    1014                 :               // Avoid reallocation for common case.
    1015                 :               __str.erase();
    1016                 :               _CharT __buf[128];
    1017                 :               __size_type __len = 0;          
    1018                 :               const streamsize __w = __in.width();
    1019                 :               const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
    1020                 :                                               : __str.max_size();
    1021                 :               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
    1022                 :               const __int_type __eof = _Traits::eof();
    1023                 :               __int_type __c = __in.rdbuf()->sgetc();
    1024                 : 
    1025                 :               while (__extracted < __n
    1026                 :                      && !_Traits::eq_int_type(__c, __eof)
    1027                 :                      && !__ct.is(__ctype_base::space,
    1028                 :                                  _Traits::to_char_type(__c)))
    1029                 :                 {
    1030                 :                   if (__len == sizeof(__buf) / sizeof(_CharT))
    1031                 :                     {
    1032                 :                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
    1033                 :                       __len = 0;
    1034                 :                     }
    1035                 :                   __buf[__len++] = _Traits::to_char_type(__c);
    1036                 :                   ++__extracted;
    1037                 :                   __c = __in.rdbuf()->snextc();
    1038                 :                 }
    1039                 :               __str.append(__buf, __len);
    1040                 : 
    1041                 :               if (_Traits::eq_int_type(__c, __eof))
    1042                 :                 __err |= __ios_base::eofbit;
    1043                 :               __in.width(0);
    1044                 :             }
    1045                 :           __catch(__cxxabiv1::__forced_unwind&)
    1046                 :             {
    1047                 :               __in._M_setstate(__ios_base::badbit);
    1048                 :               __throw_exception_again;
    1049                 :             }
    1050                 :           __catch(...)
    1051                 :             {
    1052                 :               // _GLIBCXX_RESOLVE_LIB_DEFECTS
    1053                 :               // 91. Description of operator>> and getline() for string<>
    1054                 :               // might cause endless loop
    1055                 :               __in._M_setstate(__ios_base::badbit);
    1056                 :             }
    1057                 :         }
    1058                 :       // 211.  operator>>(istream&, string&) doesn't set failbit
    1059                 :       if (!__extracted)
    1060                 :         __err |= __ios_base::failbit;
    1061                 :       if (__err)
    1062                 :         __in.setstate(__err);
    1063                 :       return __in;
    1064                 :     }
    1065                 : 
    1066                 :   template<typename _CharT, typename _Traits, typename _Alloc>
    1067                 :     basic_istream<_CharT, _Traits>&
    1068                 :     getline(basic_istream<_CharT, _Traits>& __in,
    1069                 :             basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
    1070                 :     {
    1071                 :       typedef basic_istream<_CharT, _Traits>              __istream_type;
    1072                 :       typedef basic_string<_CharT, _Traits, _Alloc>       __string_type;
    1073                 :       typedef typename __istream_type::ios_base         __ios_base;
    1074                 :       typedef typename __istream_type::int_type         __int_type;
    1075                 :       typedef typename __string_type::size_type         __size_type;
    1076                 : 
    1077                 :       __size_type __extracted = 0;
    1078                 :       const __size_type __n = __str.max_size();
    1079                 :       typename __ios_base::iostate __err = __ios_base::goodbit;
    1080                 :       typename __istream_type::sentry __cerb(__in, true);
    1081                 :       if (__cerb)
    1082                 :         {
    1083                 :           __try
    1084                 :             {
    1085                 :               __str.erase();
    1086                 :               const __int_type __idelim = _Traits::to_int_type(__delim);
    1087                 :               const __int_type __eof = _Traits::eof();
    1088                 :               __int_type __c = __in.rdbuf()->sgetc();
    1089                 : 
    1090                 :               while (__extracted < __n
    1091                 :                      && !_Traits::eq_int_type(__c, __eof)
    1092                 :                      && !_Traits::eq_int_type(__c, __idelim))
    1093                 :                 {
    1094                 :                   __str += _Traits::to_char_type(__c);
    1095                 :                   ++__extracted;
    1096                 :                   __c = __in.rdbuf()->snextc();
    1097                 :                 }
    1098                 : 
    1099                 :               if (_Traits::eq_int_type(__c, __eof))
    1100                 :                 __err |= __ios_base::eofbit;
    1101                 :               else if (_Traits::eq_int_type(__c, __idelim))
    1102                 :                 {
    1103                 :                   ++__extracted;                  
    1104                 :                   __in.rdbuf()->sbumpc();
    1105                 :                 }
    1106                 :               else
    1107                 :                 __err |= __ios_base::failbit;
    1108                 :             }
    1109                 :           __catch(__cxxabiv1::__forced_unwind&)
    1110                 :             {
    1111                 :               __in._M_setstate(__ios_base::badbit);
    1112                 :               __throw_exception_again;
    1113                 :             }
    1114                 :           __catch(...)
    1115                 :             {
    1116                 :               // _GLIBCXX_RESOLVE_LIB_DEFECTS
    1117                 :               // 91. Description of operator>> and getline() for string<>
    1118                 :               // might cause endless loop
    1119                 :               __in._M_setstate(__ios_base::badbit);
    1120                 :             }
    1121                 :         }
    1122                 :       if (!__extracted)
    1123                 :         __err |= __ios_base::failbit;
    1124                 :       if (__err)
    1125                 :         __in.setstate(__err);
    1126                 :       return __in;
    1127                 :     }
    1128                 : 
    1129                 :   // Inhibit implicit instantiations for required instantiations,
    1130                 :   // which are defined via explicit instantiations elsewhere.
    1131                 :   // NB: This syntax is a GNU extension.
    1132                 : #if _GLIBCXX_EXTERN_TEMPLATE > 0
    1133                 :   extern template class basic_string<char>;
    1134                 :   extern template
    1135                 :     basic_istream<char>&
    1136                 :     operator>>(basic_istream<char>&, string&);
    1137                 :   extern template
    1138                 :     basic_ostream<char>&
    1139                 :     operator<<(basic_ostream<char>&, const string&);
    1140                 :   extern template
    1141                 :     basic_istream<char>&
    1142                 :     getline(basic_istream<char>&, string&, char);
    1143                 :   extern template
    1144                 :     basic_istream<char>&
    1145                 :     getline(basic_istream<char>&, string&);
    1146                 : 
    1147                 : #ifdef _GLIBCXX_USE_WCHAR_T
    1148                 :   extern template class basic_string<wchar_t>;
    1149                 :   extern template
    1150                 :     basic_istream<wchar_t>&
    1151                 :     operator>>(basic_istream<wchar_t>&, wstring&);
    1152                 :   extern template
    1153                 :     basic_ostream<wchar_t>&
    1154                 :     operator<<(basic_ostream<wchar_t>&, const wstring&);
    1155                 :   extern template
    1156                 :     basic_istream<wchar_t>&
    1157                 :     getline(basic_istream<wchar_t>&, wstring&, wchar_t);
    1158                 :   extern template
    1159                 :     basic_istream<wchar_t>&
    1160                 :     getline(basic_istream<wchar_t>&, wstring&);
    1161                 : #endif
    1162                 : #endif
    1163                 : 
    1164                 : _GLIBCXX_END_NAMESPACE
    1165                 : 
    1166                 : #endif

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