basic_string.tcc

俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）的全部源代码。

// Components for manipulating sequences of characters -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

//
// ISO C++ 14882: 21  Strings library
//

// This file is included by <string>.  It is not meant to be included
// separately.

// Written by Jason Merrill based upon the specification by Takanori Adachi
// in ANSI X3J16/94-0013R2.  Rewritten by Nathan Myers to ISO-14882.

#ifndef _CPP_BITS_STRING_TCC
#define _CPP_BITS_STRING_TCC 1

#pragma GCC system_header

namespace std
{
  template<typename _CharT, typename _Traits, typename _Alloc>
    const typename basic_string<_CharT, _Traits, _Alloc>::size_type 
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_max_size = (((npos - sizeof(_Rep))/sizeof(_CharT)) - 1) / 4;

  template<typename _CharT, typename _Traits, typename _Alloc>
    const _CharT 
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_terminal = _CharT();

  template<typename _CharT, typename _Traits, typename _Alloc>
    const typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::npos;

  // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
  // at static init time (before static ctors are run).
  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::_S_empty_rep_storage[
    (sizeof(_Rep) + sizeof(_CharT) + sizeof(size_type) - 1)/sizeof(size_type)];

  // NB: This is the special case for Input Iterators, used in
  // istreambuf_iterators, etc.
  // Input Iterators have a cost structure very different from
  // pointers, calling for a different coding style.
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InIter>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIter __beg, _InIter __end, const _Alloc& __a,
		   input_iterator_tag)
      {
	if (__beg == __end && __a == _Alloc())
	  return _S_empty_rep()._M_refcopy();
	// Avoid reallocation for common case.
	_CharT __buf[100];
	size_type __i = 0;
	while (__beg != __end && __i < sizeof(__buf) / sizeof(_CharT))
	  { 
	    __buf[__i++] = *__beg; 
	    ++__beg; 
	  }
	_Rep* __r = _Rep::_S_create(__i, __a);
	traits_type::copy(__r->_M_refdata(), __buf, __i);
	__r->_M_length = __i;
	try 
	  {
	    // NB: this loop looks precisely this way because
	    // it avoids comparing __beg != __end any more
	    // than strictly necessary; != might be expensive!
	    for (;;)
	      {
		_CharT* __p = __r->_M_refdata() + __r->_M_length;
		_CharT* __last = __r->_M_refdata() + __r->_M_capacity;
		for (;;)
		  {
		    if (__beg == __end)
		      {
			__r->_M_length = __p - __r->_M_refdata();
			*__p = _Rep::_S_terminal;       // grrr.
			return __r->_M_refdata();
		      }
		    if (__p == __last)
		      break;
		    *__p++ = *__beg; 
		    ++__beg;
		  }
		// Allocate more space.
		size_type __len = __p - __r->_M_refdata();
		_Rep* __another = _Rep::_S_create(__len + 1, __a);
		traits_type::copy(__another->_M_refdata(), 
				  __r->_M_refdata(), __len);
		__r->_M_destroy(__a);
		__r = __another;
		__r->_M_length = __len;
	      }
	  }
	catch(...) 
	  {
	    __r->_M_destroy(__a); 
	    __throw_exception_again;
	  }
	return 0;
      }
  
  template<typename _CharT, typename _Traits, typename _Alloc>
    template <class _InIter>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIter __beg, _InIter __end, const _Alloc& __a, 
		   forward_iterator_tag)
      {
	if (__beg == __end && __a == _Alloc())
	  return _S_empty_rep()._M_refcopy();

	// NB: Not required, but considered best practice.
	if (__builtin_expect(__beg == _InIter(), 0))
	  __throw_logic_error("attempt to create string with null pointer");

	size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
	
	// Check for out_of_range and length_error exceptions.
	_Rep* __r = _Rep::_S_create(__dnew, __a);
	try 
	  { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
	catch(...) 
	  { 
	    __r->_M_destroy(__a); 
	    __throw_exception_again;
	  }
	__r->_M_length = __dnew;

	__r->_M_refdata()[__dnew] = _Rep::_S_terminal;  // grrr.
	return __r->_M_refdata();
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    _CharT*
    basic_string<_CharT, _Traits, _Alloc>::
    _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
    {
      if (__n == 0 && __a == _Alloc())
	return _S_empty_rep()._M_refcopy();

      // Check for out_of_range and length_error exceptions.
      _Rep* __r = _Rep::_S_create(__n, __a);
      try 
	{ 
	  if (__n) 
	    traits_type::assign(__r->_M_refdata(), __n, __c); 
	}
      catch(...) 
	{ 
	  __r->_M_destroy(__a); 
	  __throw_exception_again;
	}
      __r->_M_length = __n;
      __r->_M_refdata()[__n] = _Rep::_S_terminal;  // grrr
      return __r->_M_refdata();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str)
    : _M_dataplus(__str._M_rep()->_M_grab(_Alloc(), __str.get_allocator()),
		 __str.get_allocator())
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _Alloc& __a)
    : _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
    { }
 
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos, size_type __n)
    : _M_dataplus(_S_construct(__str._M_check(__pos), 
			       __str._M_fold(__pos, __n), _Alloc()), _Alloc())
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos,
		 size_type __n, const _Alloc& __a)
    : _M_dataplus(_S_construct(__str._M_check(__pos), 
			       __str._M_fold(__pos, __n), __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
    : _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _CharT* __s, const _Alloc& __a)
    : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
			       __s + npos, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(size_type __n, _CharT __c, const _Alloc& __a)
    : _M_dataplus(_S_construct(__n, __c, __a), __a)
    { }
 
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InputIter>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(_InputIter __beg, _InputIter __end, const _Alloc& __a)
    : _M_dataplus(_S_construct(__beg, __end, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::assign(const basic_string& __str)
    {
      if (_M_rep() != __str._M_rep())
	{
	  // XXX MT
	  allocator_type __a = this->get_allocator();
	  _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
	  _M_rep()->_M_dispose(__a);
	  _M_data(__tmp);
	}
      return *this;
    }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     assign(const basic_string& __str, size_type __pos, size_type __n)
     {
       const size_type __strsize = __str.size();
       if (__pos > __strsize)
	 __throw_out_of_range("basic_string::assign");
       const bool __testn = __n < __strsize - __pos;
       const size_type __newsize = __testn ? __n : __strsize - __pos;
       return this->assign(__str._M_data() + __pos, __newsize);
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     assign(const _CharT* __s, size_type __n)
     {
       if (__n > this->max_size())
	 __throw_length_error("basic_string::assign");
       if (_M_rep()->_M_is_shared() || less<const _CharT*>()(__s, _M_data())
	   || less<const _CharT*>()(_M_data() + this->size(), __s))
	 return _M_replace_safe(_M_ibegin(), _M_iend(), __s, __s + __n);
       else
	 {
	   // Work in-place
	   const size_type __pos = __s - _M_data();
	   if (__pos >= __n)
	     traits_type::copy(_M_data(), __s, __n);
	   else if (__pos)
	     traits_type::move(_M_data(), __s, __n);
	   _M_rep()->_M_length = __n;
	   _M_data()[__n] = _Rep::_S_terminal;  // grr.
	   return *this;
	 }
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     insert(size_type __pos1, const basic_string& __str,
            size_type __pos2, size_type __n)
     {
       const size_type __strsize = __str.size();
       if (__pos2 > __strsize)
	 __throw_out_of_range("basic_string::insert");
       const bool __testn = __n < __strsize - __pos2;
       const size_type __newsize = __testn ? __n : __strsize - __pos2;
       return this->insert(__pos1, __str._M_data() + __pos2, __newsize);
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     insert(size_type __pos, const _CharT* __s, size_type __n)
     {
       const size_type __size = this->size();
       if (__pos > __size)
         __throw_out_of_range("basic_string::insert");
       if (__size > this->max_size() - __n)
         __throw_length_error("basic_string::insert");
       if (_M_rep()->_M_is_shared() || less<const _CharT*>()(__s, _M_data())
           || less<const _CharT*>()(_M_data() + __size, __s))
         return _M_replace_safe(_M_ibegin() + __pos, _M_ibegin() + __pos,
                                __s, __s + __n);
       else
         {
           // Work in-place. If _M_mutate reallocates the string, __s
           // does not point anymore to valid data, therefore we save its
           // offset, then we restore it.
           const size_type __off = __s - _M_data();
           _M_mutate(__pos, 0, __n);
           __s = _M_data() + __off;
           _CharT* __p = _M_data() + __pos;
           if (__s  + __n <= __p)
             traits_type::copy(__p, __s, __n);
           else if (__s >= __p)
             traits_type::copy(__p, __s + __n, __n);
           else
             {
               traits_type::copy(__p, __s, __p - __s);
               traits_type::copy(__p + (__p-__s), __p + __n, __n - (__p-__s));
             }
           return *this;
         }
     }
 
   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     replace(size_type __pos, size_type __n1, const _CharT* __s,
	     size_type __n2)
     {
       const size_type __size = this->size();
       if (__pos > __size)
         __throw_out_of_range("basic_string::replace");
       const bool __testn1 = __n1 < __size - __pos;
       const size_type __foldn1 = __testn1 ? __n1 : __size - __pos;
       if (__size - __foldn1 > this->max_size() - __n2)
         __throw_length_error("basic_string::replace");
       if (_M_rep()->_M_is_shared() || less<const _CharT*>()(__s, _M_data())
           || less<const _CharT*>()(_M_data() + __size, __s))
         return _M_replace_safe(_M_ibegin() + __pos,
				_M_ibegin() + __pos + __foldn1, __s, __s + __n2);
       // Todo: optimized in-place replace.
       else
	 return _M_replace(_M_ibegin() + __pos, _M_ibegin() + __pos + __foldn1,
			   __s, __s + __n2,