vstring.h

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// Versatile string -*- C++ -*-

// Copyright (C) 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.

/** @file ext/vstring.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

#ifndef _VSTRING_H
#define _VSTRING_H 1

#pragma GCC system_header

#include <ext/vstring_util.h>
#include <ext/rc_string_base.h>
#include <ext/sso_string_base.h>

namespace __gnu_cxx
{
  /**
   *  @class __versa_string vstring.h
   *  @brief  Managing sequences of characters and character-like objects.
   */

  // Template class __versa_string
  template<typename _CharT, typename _Traits, typename _Alloc,
	   template <typename, typename, typename> class _Base>
    class __versa_string
    : private _Base<_CharT, _Traits, _Alloc>
    {
      typedef _Base<_CharT, _Traits, _Alloc>                __vstring_base;      
      typedef typename __vstring_base::_CharT_alloc_type    _CharT_alloc_type;

      // Types:
    public:
      typedef _Traits					    traits_type;
      typedef typename _Traits::char_type		    value_type;
      typedef _Alloc					    allocator_type;
      typedef typename _CharT_alloc_type::size_type	    size_type;
      typedef typename _CharT_alloc_type::difference_type   difference_type;
      typedef typename _CharT_alloc_type::reference	    reference;
      typedef typename _CharT_alloc_type::const_reference   const_reference;
      typedef typename _CharT_alloc_type::pointer	    pointer;
      typedef typename _CharT_alloc_type::const_pointer	    const_pointer;
      typedef __gnu_cxx::__normal_iterator<pointer, __versa_string>  iterator;
      typedef __gnu_cxx::__normal_iterator<const_pointer, __versa_string>
                                                            const_iterator;
      typedef std::reverse_iterator<const_iterator>	const_reverse_iterator;
      typedef std::reverse_iterator<iterator>		    reverse_iterator;

      // Data Member (public):
      // NB: This is an unsigned type, and thus represents the maximum
      // size that the allocator can hold.
      ///  Value returned by various member functions when they fail.
      static const size_type	npos = static_cast<size_type>(-1);

    private:
      size_type
      _M_check(size_type __pos, const char* __s) const
      {
	if (__pos > this->size())
	  std::__throw_out_of_range(__N(__s));
	return __pos;
      }

      void
      _M_check_length(size_type __n1, size_type __n2, const char* __s) const
      {
	if (this->max_size() - (this->size() - __n1) < __n2)
	  std::__throw_length_error(__N(__s));
      }

      // NB: _M_limit doesn't check for a bad __pos value.
      size_type
      _M_limit(size_type __pos, size_type __off) const
      {
	const bool __testoff =  __off < this->size() - __pos;
	return __testoff ? __off : this->size() - __pos;
      }

      // True if _Rep and source do not overlap.
      bool
      _M_disjunct(const _CharT* __s) const
      {
	return (std::less<const _CharT*>()(__s, this->_M_data())
		|| std::less<const _CharT*>()(this->_M_data()
					      + this->size(), __s));
      }

      // For the internal use we have functions similar to `begin'/`end'
      // but they do not call _M_leak.
      iterator
      _M_ibegin() const
      { return iterator(this->_M_data()); }

      iterator
      _M_iend() const
      { return iterator(this->_M_data() + this->_M_length()); }

    public:
      // Construct/copy/destroy:
      // NB: We overload ctors in some cases instead of using default
      // arguments, per 17.4.4.4 para. 2 item 2.

      /**
       *  @brief  Default constructor creates an empty string.
       */
      __versa_string()
      : __vstring_base() { }
      
      /**
       *  @brief  Construct an empty string using allocator @a a.
       */
      explicit
      __versa_string(const _Alloc& __a)
      : __vstring_base(__a) { }

      // NB: per LWG issue 42, semantics different from IS:
      /**
       *  @brief  Construct string with copy of value of @a str.
       *  @param  str  Source string.
       */
      __versa_string(const __versa_string& __str)
      : __vstring_base(__str) { }

      /**
       *  @brief  Construct string as copy of a substring.
       *  @param  str  Source string.
       *  @param  pos  Index of first character to copy from.
       *  @param  n  Number of characters to copy (default remainder).
       */
      __versa_string(const __versa_string& __str, size_type __pos,
		     size_type __n = npos)
      : __vstring_base(__str._M_data()
		       + __str._M_check(__pos,
					"__versa_string::__versa_string"),
		       __str._M_data() + __str._M_limit(__pos, __n)
		       + __pos, _Alloc()) { }

      /**
       *  @brief  Construct string as copy of a substring.
       *  @param  str  Source string.
       *  @param  pos  Index of first character to copy from.
       *  @param  n  Number of characters to copy.
       *  @param  a  Allocator to use.
       */
      __versa_string(const __versa_string& __str, size_type __pos,
		     size_type __n, const _Alloc& __a)
      : __vstring_base(__str._M_data()
		       + __str._M_check(__pos,
					"__versa_string::__versa_string"),
		       __str._M_data() + __str._M_limit(__pos, __n)
		       + __pos, __a) { }

      /**
       *  @brief  Construct string initialized by a character array.
       *  @param  s  Source character array.
       *  @param  n  Number of characters to copy.
       *  @param  a  Allocator to use (default is default allocator).
       *
       *  NB: @a s must have at least @a n characters, '\0' has no special
       *  meaning.
       */
      __versa_string(const _CharT* __s, size_type __n,
		     const _Alloc& __a = _Alloc())
      : __vstring_base(__s, __s + __n, __a) { }

      /**
       *  @brief  Construct string as copy of a C string.
       *  @param  s  Source C string.
       *  @param  a  Allocator to use (default is default allocator).
       */
      __versa_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      : __vstring_base(__s, __s ? __s + traits_type::length(__s) :
		       __s + npos, __a) { }

      /**
       *  @brief  Construct string as multiple characters.
       *  @param  n  Number of characters.
       *  @param  c  Character to use.
       *  @param  a  Allocator to use (default is default allocator).
       */
      __versa_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      : __vstring_base(__n, __c, __a) { }

      /**
       *  @brief  Construct string as copy of a range.
       *  @param  beg  Start of range.
       *  @param  end  End of range.
       *  @param  a  Allocator to use (default is default allocator).
       */
      template<class _InputIterator>
        __versa_string(_InputIterator __beg, _InputIterator __end,
		       const _Alloc& __a = _Alloc())
	: __vstring_base(__beg, __end, __a) { }

      /**
       *  @brief  Destroy the string instance.
       */
      ~__versa_string() { }	

      /**
       *  @brief  Assign the value of @a str to this string.
       *  @param  str  Source string.
       */
      __versa_string&
      operator=(const __versa_string& __str) 
      { return this->assign(__str); }

      /**
       *  @brief  Copy contents of @a s into this string.
       *  @param  s  Source null-terminated string.
       */
      __versa_string&
      operator=(const _CharT* __s) 
      { return this->assign(__s); }

      /**
       *  @brief  Set value to string of length 1.
       *  @param  c  Source character.
       *
       *  Assigning to a character makes this string length 1 and
       *  (*this)[0] == @a c.
       */
      __versa_string&
      operator=(_CharT __c) 
      { 
	this->assign(1, __c); 
	return *this;
      }

      // Iterators:
      /**
       *  Returns a read/write iterator that points to the first character in
       *  the %string.  Unshares the string.
       */
      iterator
      begin()
      {
	this->_M_leak();
	return iterator(this->_M_data());
      }

      /**
       *  Returns a read-only (constant) iterator that points to the first
       *  character in the %string.
       */
      const_iterator
      begin() const
      { return const_iterator(this->_M_data()); }

      /**
       *  Returns a read/write iterator that points one past the last
       *  character in the %string.  Unshares the string.
       */
      iterator
      end()
      {
	this->_M_leak();
	return iterator(this->_M_data() + this->size());
      }

      /**
       *  Returns a read-only (constant) iterator that points one past the
       *  last character in the %string.
       */
      const_iterator
      end() const
      { return const_iterator(this->_M_data() + this->size()); }

      /**
       *  Returns a read/write reverse iterator that points to the last
       *  character in the %string.  Iteration is done in reverse element
       *  order.  Unshares the string.
       */
      reverse_iterator
      rbegin()
      { return reverse_iterator(this->end()); }

      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to the last character in the %string.  Iteration is done in
       *  reverse element order.
       */
      const_reverse_iterator
      rbegin() const
      { return const_reverse_iterator(this->end()); }

      /**
       *  Returns a read/write reverse iterator that points to one before the
       *  first character in the %string.  Iteration is done in reverse
       *  element order.  Unshares the string.
       */
      reverse_iterator
      rend()
      { return reverse_iterator(this->begin()); }

      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to one before the first character in the %string.  Iteration
       *  is done in reverse element order.
       */
      const_reverse_iterator
      rend() const
      { return const_reverse_iterator(this->begin()); }

    public:
      // Capacity:
      ///  Returns the number of characters in the string, not including any
      ///  null-termination.
      size_type
      size() const
      { return this->_M_length(); }

      ///  Returns the number of characters in the string, not including any
      ///  null-termination.
      size_type