b6cb8dc2d8
2005-11-21 Paolo Carlini <pcarlini@suse.de> * include/ext/sso_string_base.h: Minor formatting and stylistic fixes. (__sso_string_base<>::_M_get_allocator): Return by const ref. * include/ext/rc_string_base.h: Likewise. (__rc_string_base<>::_M_get_allocator): Return by const ref. (__rc_string_base<>::_M_dispose): Take void, use _M_get_allocator. (__rc_string_base<>::_M_grab): Take one alloc, use _M_get_allocator. (__rc_string_base<>::~__rc_string_base, __rc_string_base(const __rc_string_base&), _M_assign, _M_reserve, _M_mutate): Adjust. * include/ext/vstring_util.h: Minor stylistic fixes. From-SVN: r107317
541 lines
16 KiB
C++
541 lines
16 KiB
C++
// Short-string-optimized versatile string base -*- 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/sso_string_base.h
|
|
* This file is a GNU extension to the Standard C++ Library.
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef _SSO_STRING_BASE_H
|
|
#define _SSO_STRING_BASE_H 1
|
|
|
|
namespace __gnu_cxx
|
|
{
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
class __sso_string_base
|
|
: protected __vstring_utility<_CharT, _Traits, _Alloc>
|
|
{
|
|
public:
|
|
typedef _Traits traits_type;
|
|
typedef typename _Traits::char_type value_type;
|
|
typedef _Alloc allocator_type;
|
|
|
|
typedef __vstring_utility<_CharT, _Traits, _Alloc> _Util_Base;
|
|
typedef typename _Util_Base::_CharT_alloc_type _CharT_alloc_type;
|
|
typedef typename _CharT_alloc_type::size_type size_type;
|
|
|
|
private:
|
|
// The maximum number of individual char_type elements of an
|
|
// individual string is determined by _S_max_size. This is the
|
|
// value that will be returned by max_size(). (Whereas npos
|
|
// is the maximum number of bytes the allocator can allocate.)
|
|
// If one was to divvy up the theoretical largest size string,
|
|
// with a terminating character and m _CharT elements, it'd
|
|
// look like this:
|
|
// npos = m * sizeof(_CharT) + sizeof(_CharT)
|
|
// Solving for m:
|
|
// m = npos / sizeof(_CharT) - 1
|
|
// In addition, this implementation quarters this amount.
|
|
enum { _S_max_size = (((static_cast<size_type>(-1)
|
|
/ sizeof(_CharT)) - 1) / 4) };
|
|
|
|
// Data Members (private):
|
|
typename _Util_Base::template _Alloc_hider<_Alloc> _M_dataplus;
|
|
size_type _M_string_length;
|
|
|
|
enum { _S_local_capacity = 15 };
|
|
|
|
union
|
|
{
|
|
_CharT _M_local_data[_S_local_capacity + 1];
|
|
size_type _M_allocated_capacity;
|
|
};
|
|
|
|
void
|
|
_M_data(_CharT* __p)
|
|
{ _M_dataplus._M_p = __p; }
|
|
|
|
void
|
|
_M_length(size_type __length)
|
|
{ _M_string_length = __length; }
|
|
|
|
void
|
|
_M_capacity(size_type __capacity)
|
|
{ _M_allocated_capacity = __capacity; }
|
|
|
|
bool
|
|
_M_is_local() const
|
|
{ return _M_data() == _M_local_data; }
|
|
|
|
// Create & Destroy
|
|
_CharT*
|
|
_M_create(size_type&, size_type);
|
|
|
|
void
|
|
_M_dispose()
|
|
{
|
|
if (!_M_is_local())
|
|
_M_destroy(_M_allocated_capacity + 1);
|
|
}
|
|
|
|
void
|
|
_M_destroy(size_type) throw();
|
|
|
|
// _M_construct_aux is used to implement the 21.3.1 para 15 which
|
|
// requires special behaviour if _InIterator is an integral type
|
|
template<typename _InIterator>
|
|
void
|
|
_M_construct_aux(_InIterator __beg, _InIterator __end, __false_type)
|
|
{
|
|
typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
|
|
_M_construct(__beg, __end, _Tag());
|
|
}
|
|
|
|
template<typename _InIterator>
|
|
void
|
|
_M_construct_aux(_InIterator __beg, _InIterator __end, __true_type)
|
|
{ _M_construct(static_cast<size_type>(__beg),
|
|
static_cast<value_type>(__end)); }
|
|
|
|
template<typename _InIterator>
|
|
void
|
|
_M_construct(_InIterator __beg, _InIterator __end)
|
|
{
|
|
typedef typename std::__is_integer<_InIterator>::__type _Integral;
|
|
_M_construct_aux(__beg, __end, _Integral());
|
|
}
|
|
|
|
// For Input Iterators, used in istreambuf_iterators, etc.
|
|
template<typename _InIterator>
|
|
void
|
|
_M_construct(_InIterator __beg, _InIterator __end,
|
|
std::input_iterator_tag);
|
|
|
|
// For forward_iterators up to random_access_iterators, used for
|
|
// string::iterator, _CharT*, etc.
|
|
template<typename _FwdIterator>
|
|
void
|
|
_M_construct(_FwdIterator __beg, _FwdIterator __end,
|
|
std::forward_iterator_tag);
|
|
|
|
void
|
|
_M_construct(size_type __req, _CharT __c);
|
|
|
|
public:
|
|
size_type
|
|
_M_max_size() const
|
|
{ return size_type(_S_max_size); }
|
|
|
|
_CharT*
|
|
_M_data() const
|
|
{ return _M_dataplus._M_p; }
|
|
|
|
size_type
|
|
_M_length() const
|
|
{ return _M_string_length; }
|
|
|
|
size_type
|
|
_M_capacity() const
|
|
{
|
|
return _M_is_local() ? size_type(_S_local_capacity)
|
|
: _M_allocated_capacity;
|
|
}
|
|
|
|
bool
|
|
_M_is_shared() const
|
|
{ return false; }
|
|
|
|
void
|
|
_M_set_leaked() { }
|
|
|
|
void
|
|
_M_leak() { }
|
|
|
|
void
|
|
_M_set_length(size_type __n)
|
|
{
|
|
_M_length(__n);
|
|
traits_type::assign(_M_data()[__n], _CharT());
|
|
}
|
|
|
|
__sso_string_base()
|
|
: _M_dataplus(_Alloc(), _M_local_data)
|
|
{ _M_set_length(0); }
|
|
|
|
__sso_string_base(const _Alloc& __a);
|
|
|
|
__sso_string_base(const __sso_string_base& __rcs);
|
|
|
|
__sso_string_base(size_type __n, _CharT __c, const _Alloc& __a);
|
|
|
|
template<typename _InputIterator>
|
|
__sso_string_base(_InputIterator __beg, _InputIterator __end,
|
|
const _Alloc& __a);
|
|
|
|
~__sso_string_base()
|
|
{ _M_dispose(); }
|
|
|
|
const allocator_type&
|
|
_M_get_allocator() const
|
|
{ return _M_dataplus; }
|
|
|
|
void
|
|
_M_swap(__sso_string_base& __rcs);
|
|
|
|
void
|
|
_M_assign(const __sso_string_base& __rcs);
|
|
|
|
void
|
|
_M_reserve(size_type __res);
|
|
|
|
void
|
|
_M_mutate(size_type __pos, size_type __len1, size_type __len2);
|
|
};
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_destroy(size_type __size) throw()
|
|
{ _CharT_alloc_type(_M_get_allocator()).deallocate(_M_data(), __size); }
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_swap(__sso_string_base& __rcs)
|
|
{
|
|
// NB: Implement Option 3 of DR 431 (see N1599).
|
|
_M_dataplus._M_alloc_swap(__rcs._M_dataplus);
|
|
|
|
if (_M_is_local())
|
|
if (__rcs._M_is_local())
|
|
{
|
|
if (_M_length() && __rcs._M_length())
|
|
{
|
|
_CharT __tmp_data[_S_local_capacity + 1];
|
|
traits_type::copy(__tmp_data, __rcs._M_local_data,
|
|
_S_local_capacity + 1);
|
|
traits_type::copy(__rcs._M_local_data, _M_local_data,
|
|
_S_local_capacity + 1);
|
|
traits_type::copy(_M_local_data, __tmp_data,
|
|
_S_local_capacity + 1);
|
|
}
|
|
else if (__rcs._M_length())
|
|
{
|
|
traits_type::copy(_M_local_data, __rcs._M_local_data,
|
|
_S_local_capacity + 1);
|
|
_M_length(__rcs._M_length());
|
|
__rcs._M_set_length(0);
|
|
return;
|
|
}
|
|
else if (_M_length())
|
|
{
|
|
traits_type::copy(__rcs._M_local_data, _M_local_data,
|
|
_S_local_capacity + 1);
|
|
__rcs._M_length(_M_length());
|
|
_M_set_length(0);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
const size_type __tmp_capacity = __rcs._M_allocated_capacity;
|
|
traits_type::copy(__rcs._M_local_data, _M_local_data,
|
|
_S_local_capacity + 1);
|
|
_M_data(__rcs._M_data());
|
|
__rcs._M_data(__rcs._M_local_data);
|
|
_M_capacity(__tmp_capacity);
|
|
}
|
|
else
|
|
{
|
|
const size_type __tmp_capacity = _M_allocated_capacity;
|
|
if (__rcs._M_is_local())
|
|
{
|
|
traits_type::copy(_M_local_data, __rcs._M_local_data,
|
|
_S_local_capacity + 1);
|
|
__rcs._M_data(_M_data());
|
|
_M_data(_M_local_data);
|
|
}
|
|
else
|
|
{
|
|
_CharT* __tmp_ptr = _M_data();
|
|
_M_data(__rcs._M_data());
|
|
__rcs._M_data(__tmp_ptr);
|
|
_M_capacity(__rcs._M_allocated_capacity);
|
|
}
|
|
__rcs._M_capacity(__tmp_capacity);
|
|
}
|
|
|
|
const size_type __tmp_length = _M_length();
|
|
_M_length(__rcs._M_length());
|
|
__rcs._M_length(__tmp_length);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
_CharT*
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_create(size_type& __capacity, size_type __old_capacity)
|
|
{
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 83. String::npos vs. string::max_size()
|
|
if (__capacity > size_type(_S_max_size))
|
|
std::__throw_length_error(__N("__sso_string_base::_M_create"));
|
|
|
|
// The below implements an exponential growth policy, necessary to
|
|
// meet amortized linear time requirements of the library: see
|
|
// http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
|
|
if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
|
|
__capacity = 2 * __old_capacity;
|
|
|
|
// NB: Need an array of char_type[__capacity], plus a terminating
|
|
// null char_type() element.
|
|
return _CharT_alloc_type(_M_get_allocator()).allocate(__capacity + 1);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
__sso_string_base(const _Alloc& __a)
|
|
: _M_dataplus(__a, _M_local_data)
|
|
{ _M_set_length(0); }
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
__sso_string_base(const __sso_string_base& __rcs)
|
|
: _M_dataplus(__rcs._M_get_allocator(), _M_local_data)
|
|
{ _M_construct(__rcs._M_data(), __rcs._M_data() + __rcs._M_length()); }
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
__sso_string_base(size_type __n, _CharT __c, const _Alloc& __a)
|
|
: _M_dataplus(__a, _M_local_data)
|
|
{ _M_construct(__n, __c); }
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
template<typename _InputIterator>
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
__sso_string_base(_InputIterator __beg, _InputIterator __end,
|
|
const _Alloc& __a)
|
|
: _M_dataplus(__a, _M_local_data)
|
|
{ _M_construct(__beg, __end); }
|
|
|
|
// 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 _InIterator>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_construct(_InIterator __beg, _InIterator __end,
|
|
std::input_iterator_tag)
|
|
{
|
|
size_type __len = 0;
|
|
size_type __capacity = size_type(_S_local_capacity);
|
|
|
|
while (__beg != __end && __len < __capacity)
|
|
{
|
|
_M_data()[__len++] = *__beg;
|
|
++__beg;
|
|
}
|
|
|
|
try
|
|
{
|
|
while (__beg != __end)
|
|
{
|
|
if (__len == __capacity)
|
|
{
|
|
// Allocate more space.
|
|
__capacity = __len + 1;
|
|
_CharT* __another = _M_create(__capacity, __len);
|
|
_S_copy(__another, _M_data(), __len);
|
|
_M_dispose();
|
|
_M_data(__another);
|
|
_M_capacity(__capacity);
|
|
}
|
|
_M_data()[__len++] = *__beg;
|
|
++__beg;
|
|
}
|
|
}
|
|
catch(...)
|
|
{
|
|
_M_dispose();
|
|
__throw_exception_again;
|
|
}
|
|
|
|
_M_set_length(__len);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
template<typename _InIterator>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_construct(_InIterator __beg, _InIterator __end,
|
|
std::forward_iterator_tag)
|
|
{
|
|
// NB: Not required, but considered best practice.
|
|
if (__builtin_expect(_S_is_null_pointer(__beg) && __beg != __end, 0))
|
|
std::__throw_logic_error(__N("__sso_string_base::"
|
|
"_M_construct NULL not valid"));
|
|
|
|
size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
|
|
|
|
if (__dnew > size_type(_S_local_capacity))
|
|
{
|
|
_M_data(_M_create(__dnew, size_type(0)));
|
|
_M_capacity(__dnew);
|
|
}
|
|
|
|
// Check for out_of_range and length_error exceptions.
|
|
try
|
|
{ _S_copy_chars(_M_data(), __beg, __end); }
|
|
catch(...)
|
|
{
|
|
_M_dispose();
|
|
__throw_exception_again;
|
|
}
|
|
|
|
_M_set_length(__dnew);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_construct(size_type __n, _CharT __c)
|
|
{
|
|
if (__n > size_type(_S_local_capacity))
|
|
{
|
|
_M_data(_M_create(__n, size_type(0)));
|
|
_M_capacity(__n);
|
|
}
|
|
|
|
if (__n)
|
|
_S_assign(_M_data(), __n, __c);
|
|
|
|
_M_set_length(__n);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_assign(const __sso_string_base& __rcs)
|
|
{
|
|
if (this != &__rcs)
|
|
{
|
|
size_type __size = __rcs._M_length();
|
|
|
|
_CharT* __tmp = _M_local_data;
|
|
if (__size > size_type(_S_local_capacity))
|
|
__tmp = _M_create(__size, size_type(0));
|
|
|
|
_M_dispose();
|
|
_M_data(__tmp);
|
|
|
|
if (__size)
|
|
_S_copy(_M_data(), __rcs._M_data(), __size);
|
|
|
|
if (!_M_is_local())
|
|
_M_capacity(__size);
|
|
|
|
_M_set_length(__size);
|
|
}
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_reserve(size_type __res)
|
|
{
|
|
const size_type __capacity = _M_capacity();
|
|
if (__res != __capacity)
|
|
{
|
|
// Make sure we don't shrink below the current size.
|
|
if (__res < _M_length())
|
|
__res = _M_length();
|
|
|
|
if (__res > __capacity
|
|
|| __res > size_type(_S_local_capacity))
|
|
{
|
|
_CharT* __tmp = _M_create(__res, __capacity);
|
|
if (_M_length())
|
|
_S_copy(__tmp, _M_data(), _M_length());
|
|
_M_dispose();
|
|
_M_data(__tmp);
|
|
_M_capacity(__res);
|
|
}
|
|
else if (!_M_is_local())
|
|
{
|
|
const size_type __tmp_capacity = _M_allocated_capacity;
|
|
if (_M_length())
|
|
_S_copy(_M_local_data, _M_data(), _M_length());
|
|
_M_destroy(__tmp_capacity + 1);
|
|
_M_data(_M_local_data);
|
|
}
|
|
|
|
_M_set_length(_M_length());
|
|
}
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_mutate(size_type __pos, size_type __len1, size_type __len2)
|
|
{
|
|
const size_type __old_size = _M_length();
|
|
const size_type __new_size = __old_size + __len2 - __len1;
|
|
const size_type __how_much = __old_size - __pos - __len1;
|
|
|
|
if (__new_size > _M_capacity())
|
|
{
|
|
// Must reallocate.
|
|
size_type __new_capacity = __new_size;
|
|
_CharT* __r = _M_create(__new_capacity, _M_capacity());
|
|
|
|
if (__pos)
|
|
_S_copy(__r, _M_data(), __pos);
|
|
if (__how_much)
|
|
_S_copy(__r + __pos + __len2,
|
|
_M_data() + __pos + __len1, __how_much);
|
|
|
|
_M_dispose();
|
|
_M_data(__r);
|
|
_M_capacity(__new_capacity);
|
|
}
|
|
else if (__how_much && __len1 != __len2)
|
|
{
|
|
// Work in-place.
|
|
_S_move(_M_data() + __pos + __len2,
|
|
_M_data() + __pos + __len1, __how_much);
|
|
}
|
|
|
|
_M_set_length(__new_size);
|
|
}
|
|
} // namespace __gnu_cxx
|
|
|
|
#endif /* _SSO_STRING_BASE_H */
|