1 |
742 |
jeremybenn |
// Reference-counted versatile string base -*- C++ -*-
|
2 |
|
|
|
3 |
|
|
// Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
|
4 |
|
|
// Free Software Foundation, Inc.
|
5 |
|
|
//
|
6 |
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
7 |
|
|
// software; you can redistribute it and/or modify it under the
|
8 |
|
|
// terms of the GNU General Public License as published by the
|
9 |
|
|
// Free Software Foundation; either version 3, or (at your option)
|
10 |
|
|
// any later version.
|
11 |
|
|
|
12 |
|
|
// This library is distributed in the hope that it will be useful,
|
13 |
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
14 |
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
15 |
|
|
// GNU General Public License for more details.
|
16 |
|
|
|
17 |
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
18 |
|
|
// permissions described in the GCC Runtime Library Exception, version
|
19 |
|
|
// 3.1, as published by the Free Software Foundation.
|
20 |
|
|
|
21 |
|
|
// You should have received a copy of the GNU General Public License and
|
22 |
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
23 |
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
24 |
|
|
// <http://www.gnu.org/licenses/>.
|
25 |
|
|
|
26 |
|
|
/** @file ext/rc_string_base.h
|
27 |
|
|
* This is an internal header file, included by other library headers.
|
28 |
|
|
* Do not attempt to use it directly. @headername{ext/vstring.h}
|
29 |
|
|
*/
|
30 |
|
|
|
31 |
|
|
#ifndef _RC_STRING_BASE_H
|
32 |
|
|
#define _RC_STRING_BASE_H 1
|
33 |
|
|
|
34 |
|
|
#include <ext/atomicity.h>
|
35 |
|
|
#include <bits/stl_iterator_base_funcs.h>
|
36 |
|
|
|
37 |
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
38 |
|
|
{
|
39 |
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
40 |
|
|
|
41 |
|
|
/**
|
42 |
|
|
* Documentation? What's that?
|
43 |
|
|
* Nathan Myers <ncm@cantrip.org>.
|
44 |
|
|
*
|
45 |
|
|
* A string looks like this:
|
46 |
|
|
*
|
47 |
|
|
* @code
|
48 |
|
|
* [_Rep]
|
49 |
|
|
* _M_length
|
50 |
|
|
* [__rc_string_base<char_type>] _M_capacity
|
51 |
|
|
* _M_dataplus _M_refcount
|
52 |
|
|
* _M_p ----------------> unnamed array of char_type
|
53 |
|
|
* @endcode
|
54 |
|
|
*
|
55 |
|
|
* Where the _M_p points to the first character in the string, and
|
56 |
|
|
* you cast it to a pointer-to-_Rep and subtract 1 to get a
|
57 |
|
|
* pointer to the header.
|
58 |
|
|
*
|
59 |
|
|
* This approach has the enormous advantage that a string object
|
60 |
|
|
* requires only one allocation. All the ugliness is confined
|
61 |
|
|
* within a single pair of inline functions, which each compile to
|
62 |
|
|
* a single @a add instruction: _Rep::_M_refdata(), and
|
63 |
|
|
* __rc_string_base::_M_rep(); and the allocation function which gets a
|
64 |
|
|
* block of raw bytes and with room enough and constructs a _Rep
|
65 |
|
|
* object at the front.
|
66 |
|
|
*
|
67 |
|
|
* The reason you want _M_data pointing to the character array and
|
68 |
|
|
* not the _Rep is so that the debugger can see the string
|
69 |
|
|
* contents. (Probably we should add a non-inline member to get
|
70 |
|
|
* the _Rep for the debugger to use, so users can check the actual
|
71 |
|
|
* string length.)
|
72 |
|
|
*
|
73 |
|
|
* Note that the _Rep object is a POD so that you can have a
|
74 |
|
|
* static <em>empty string</em> _Rep object already @a constructed before
|
75 |
|
|
* static constructors have run. The reference-count encoding is
|
76 |
|
|
* chosen so that a 0 indicates one reference, so you never try to
|
77 |
|
|
* destroy the empty-string _Rep object.
|
78 |
|
|
*
|
79 |
|
|
* All but the last paragraph is considered pretty conventional
|
80 |
|
|
* for a C++ string implementation.
|
81 |
|
|
*/
|
82 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
83 |
|
|
class __rc_string_base
|
84 |
|
|
: protected __vstring_utility<_CharT, _Traits, _Alloc>
|
85 |
|
|
{
|
86 |
|
|
public:
|
87 |
|
|
typedef _Traits traits_type;
|
88 |
|
|
typedef typename _Traits::char_type value_type;
|
89 |
|
|
typedef _Alloc allocator_type;
|
90 |
|
|
|
91 |
|
|
typedef __vstring_utility<_CharT, _Traits, _Alloc> _Util_Base;
|
92 |
|
|
typedef typename _Util_Base::_CharT_alloc_type _CharT_alloc_type;
|
93 |
|
|
typedef typename _CharT_alloc_type::size_type size_type;
|
94 |
|
|
|
95 |
|
|
private:
|
96 |
|
|
// _Rep: string representation
|
97 |
|
|
// Invariants:
|
98 |
|
|
// 1. String really contains _M_length + 1 characters: due to 21.3.4
|
99 |
|
|
// must be kept null-terminated.
|
100 |
|
|
// 2. _M_capacity >= _M_length
|
101 |
|
|
// Allocated memory is always (_M_capacity + 1) * sizeof(_CharT).
|
102 |
|
|
// 3. _M_refcount has three states:
|
103 |
|
|
// -1: leaked, one reference, no ref-copies allowed, non-const.
|
104 |
|
|
// 0: one reference, non-const.
|
105 |
|
|
// n>0: n + 1 references, operations require a lock, const.
|
106 |
|
|
// 4. All fields == 0 is an empty string, given the extra storage
|
107 |
|
|
// beyond-the-end for a null terminator; thus, the shared
|
108 |
|
|
// empty string representation needs no constructor.
|
109 |
|
|
struct _Rep
|
110 |
|
|
{
|
111 |
|
|
union
|
112 |
|
|
{
|
113 |
|
|
struct
|
114 |
|
|
{
|
115 |
|
|
size_type _M_length;
|
116 |
|
|
size_type _M_capacity;
|
117 |
|
|
_Atomic_word _M_refcount;
|
118 |
|
|
} _M_info;
|
119 |
|
|
|
120 |
|
|
// Only for alignment purposes.
|
121 |
|
|
_CharT _M_align;
|
122 |
|
|
};
|
123 |
|
|
|
124 |
|
|
typedef typename _Alloc::template rebind<_Rep>::other _Rep_alloc_type;
|
125 |
|
|
|
126 |
|
|
_CharT*
|
127 |
|
|
_M_refdata() throw()
|
128 |
|
|
{ return reinterpret_cast<_CharT*>(this + 1); }
|
129 |
|
|
|
130 |
|
|
_CharT*
|
131 |
|
|
_M_refcopy() throw()
|
132 |
|
|
{
|
133 |
|
|
__atomic_add_dispatch(&_M_info._M_refcount, 1);
|
134 |
|
|
return _M_refdata();
|
135 |
|
|
} // XXX MT
|
136 |
|
|
|
137 |
|
|
void
|
138 |
|
|
_M_set_length(size_type __n)
|
139 |
|
|
{
|
140 |
|
|
_M_info._M_refcount = 0; // One reference.
|
141 |
|
|
_M_info._M_length = __n;
|
142 |
|
|
// grrr. (per 21.3.4)
|
143 |
|
|
// You cannot leave those LWG people alone for a second.
|
144 |
|
|
traits_type::assign(_M_refdata()[__n], _CharT());
|
145 |
|
|
}
|
146 |
|
|
|
147 |
|
|
// Create & Destroy
|
148 |
|
|
static _Rep*
|
149 |
|
|
_S_create(size_type, size_type, const _Alloc&);
|
150 |
|
|
|
151 |
|
|
void
|
152 |
|
|
_M_destroy(const _Alloc&) throw();
|
153 |
|
|
|
154 |
|
|
_CharT*
|
155 |
|
|
_M_clone(const _Alloc&, size_type __res = 0);
|
156 |
|
|
};
|
157 |
|
|
|
158 |
|
|
struct _Rep_empty
|
159 |
|
|
: public _Rep
|
160 |
|
|
{
|
161 |
|
|
_CharT _M_terminal;
|
162 |
|
|
};
|
163 |
|
|
|
164 |
|
|
static _Rep_empty _S_empty_rep;
|
165 |
|
|
|
166 |
|
|
// The maximum number of individual char_type elements of an
|
167 |
|
|
// individual string is determined by _S_max_size. This is the
|
168 |
|
|
// value that will be returned by max_size(). (Whereas npos
|
169 |
|
|
// is the maximum number of bytes the allocator can allocate.)
|
170 |
|
|
// If one was to divvy up the theoretical largest size string,
|
171 |
|
|
// with a terminating character and m _CharT elements, it'd
|
172 |
|
|
// look like this:
|
173 |
|
|
// npos = sizeof(_Rep) + (m * sizeof(_CharT)) + sizeof(_CharT)
|
174 |
|
|
// + sizeof(_Rep) - 1
|
175 |
|
|
// (NB: last two terms for rounding reasons, see _M_create below)
|
176 |
|
|
// Solving for m:
|
177 |
|
|
// m = ((npos - 2 * sizeof(_Rep) + 1) / sizeof(_CharT)) - 1
|
178 |
|
|
// In addition, this implementation halves this amount.
|
179 |
|
|
enum { _S_max_size = (((static_cast<size_type>(-1) - 2 * sizeof(_Rep)
|
180 |
|
|
+ 1) / sizeof(_CharT)) - 1) / 2 };
|
181 |
|
|
|
182 |
|
|
// Data Member (private):
|
183 |
|
|
mutable typename _Util_Base::template _Alloc_hider<_Alloc> _M_dataplus;
|
184 |
|
|
|
185 |
|
|
void
|
186 |
|
|
_M_data(_CharT* __p)
|
187 |
|
|
{ _M_dataplus._M_p = __p; }
|
188 |
|
|
|
189 |
|
|
_Rep*
|
190 |
|
|
_M_rep() const
|
191 |
|
|
{ return &((reinterpret_cast<_Rep*>(_M_data()))[-1]); }
|
192 |
|
|
|
193 |
|
|
_CharT*
|
194 |
|
|
_M_grab(const _Alloc& __alloc) const
|
195 |
|
|
{
|
196 |
|
|
return (!_M_is_leaked() && _M_get_allocator() == __alloc)
|
197 |
|
|
? _M_rep()->_M_refcopy() : _M_rep()->_M_clone(__alloc);
|
198 |
|
|
}
|
199 |
|
|
|
200 |
|
|
void
|
201 |
|
|
_M_dispose()
|
202 |
|
|
{
|
203 |
|
|
// Be race-detector-friendly. For more info see bits/c++config.
|
204 |
|
|
_GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_rep()->_M_info.
|
205 |
|
|
_M_refcount);
|
206 |
|
|
if (__exchange_and_add_dispatch(&_M_rep()->_M_info._M_refcount,
|
207 |
|
|
-1) <= 0)
|
208 |
|
|
{
|
209 |
|
|
_GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_rep()->_M_info.
|
210 |
|
|
_M_refcount);
|
211 |
|
|
_M_rep()->_M_destroy(_M_get_allocator());
|
212 |
|
|
}
|
213 |
|
|
} // XXX MT
|
214 |
|
|
|
215 |
|
|
bool
|
216 |
|
|
_M_is_leaked() const
|
217 |
|
|
{ return _M_rep()->_M_info._M_refcount < 0; }
|
218 |
|
|
|
219 |
|
|
void
|
220 |
|
|
_M_set_sharable()
|
221 |
|
|
{ _M_rep()->_M_info._M_refcount = 0; }
|
222 |
|
|
|
223 |
|
|
void
|
224 |
|
|
_M_leak_hard();
|
225 |
|
|
|
226 |
|
|
// _S_construct_aux is used to implement the 21.3.1 para 15 which
|
227 |
|
|
// requires special behaviour if _InIterator is an integral type
|
228 |
|
|
template<typename _InIterator>
|
229 |
|
|
static _CharT*
|
230 |
|
|
_S_construct_aux(_InIterator __beg, _InIterator __end,
|
231 |
|
|
const _Alloc& __a, std::__false_type)
|
232 |
|
|
{
|
233 |
|
|
typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
|
234 |
|
|
return _S_construct(__beg, __end, __a, _Tag());
|
235 |
|
|
}
|
236 |
|
|
|
237 |
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
238 |
|
|
// 438. Ambiguity in the "do the right thing" clause
|
239 |
|
|
template<typename _Integer>
|
240 |
|
|
static _CharT*
|
241 |
|
|
_S_construct_aux(_Integer __beg, _Integer __end,
|
242 |
|
|
const _Alloc& __a, std::__true_type)
|
243 |
|
|
{ return _S_construct_aux_2(static_cast<size_type>(__beg),
|
244 |
|
|
__end, __a); }
|
245 |
|
|
|
246 |
|
|
static _CharT*
|
247 |
|
|
_S_construct_aux_2(size_type __req, _CharT __c, const _Alloc& __a)
|
248 |
|
|
{ return _S_construct(__req, __c, __a); }
|
249 |
|
|
|
250 |
|
|
template<typename _InIterator>
|
251 |
|
|
static _CharT*
|
252 |
|
|
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a)
|
253 |
|
|
{
|
254 |
|
|
typedef typename std::__is_integer<_InIterator>::__type _Integral;
|
255 |
|
|
return _S_construct_aux(__beg, __end, __a, _Integral());
|
256 |
|
|
}
|
257 |
|
|
|
258 |
|
|
// For Input Iterators, used in istreambuf_iterators, etc.
|
259 |
|
|
template<typename _InIterator>
|
260 |
|
|
static _CharT*
|
261 |
|
|
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
|
262 |
|
|
std::input_iterator_tag);
|
263 |
|
|
|
264 |
|
|
// For forward_iterators up to random_access_iterators, used for
|
265 |
|
|
// string::iterator, _CharT*, etc.
|
266 |
|
|
template<typename _FwdIterator>
|
267 |
|
|
static _CharT*
|
268 |
|
|
_S_construct(_FwdIterator __beg, _FwdIterator __end, const _Alloc& __a,
|
269 |
|
|
std::forward_iterator_tag);
|
270 |
|
|
|
271 |
|
|
static _CharT*
|
272 |
|
|
_S_construct(size_type __req, _CharT __c, const _Alloc& __a);
|
273 |
|
|
|
274 |
|
|
public:
|
275 |
|
|
size_type
|
276 |
|
|
_M_max_size() const
|
277 |
|
|
{ return size_type(_S_max_size); }
|
278 |
|
|
|
279 |
|
|
_CharT*
|
280 |
|
|
_M_data() const
|
281 |
|
|
{ return _M_dataplus._M_p; }
|
282 |
|
|
|
283 |
|
|
size_type
|
284 |
|
|
_M_length() const
|
285 |
|
|
{ return _M_rep()->_M_info._M_length; }
|
286 |
|
|
|
287 |
|
|
size_type
|
288 |
|
|
_M_capacity() const
|
289 |
|
|
{ return _M_rep()->_M_info._M_capacity; }
|
290 |
|
|
|
291 |
|
|
bool
|
292 |
|
|
_M_is_shared() const
|
293 |
|
|
{ return _M_rep()->_M_info._M_refcount > 0; }
|
294 |
|
|
|
295 |
|
|
void
|
296 |
|
|
_M_set_leaked()
|
297 |
|
|
{ _M_rep()->_M_info._M_refcount = -1; }
|
298 |
|
|
|
299 |
|
|
void
|
300 |
|
|
_M_leak() // for use in begin() & non-const op[]
|
301 |
|
|
{
|
302 |
|
|
if (!_M_is_leaked())
|
303 |
|
|
_M_leak_hard();
|
304 |
|
|
}
|
305 |
|
|
|
306 |
|
|
void
|
307 |
|
|
_M_set_length(size_type __n)
|
308 |
|
|
{ _M_rep()->_M_set_length(__n); }
|
309 |
|
|
|
310 |
|
|
__rc_string_base()
|
311 |
|
|
: _M_dataplus(_S_empty_rep._M_refcopy()) { }
|
312 |
|
|
|
313 |
|
|
__rc_string_base(const _Alloc& __a);
|
314 |
|
|
|
315 |
|
|
__rc_string_base(const __rc_string_base& __rcs);
|
316 |
|
|
|
317 |
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
318 |
|
|
__rc_string_base(__rc_string_base&& __rcs)
|
319 |
|
|
: _M_dataplus(__rcs._M_dataplus)
|
320 |
|
|
{ __rcs._M_data(_S_empty_rep._M_refcopy()); }
|
321 |
|
|
#endif
|
322 |
|
|
|
323 |
|
|
__rc_string_base(size_type __n, _CharT __c, const _Alloc& __a);
|
324 |
|
|
|
325 |
|
|
template<typename _InputIterator>
|
326 |
|
|
__rc_string_base(_InputIterator __beg, _InputIterator __end,
|
327 |
|
|
const _Alloc& __a);
|
328 |
|
|
|
329 |
|
|
~__rc_string_base()
|
330 |
|
|
{ _M_dispose(); }
|
331 |
|
|
|
332 |
|
|
allocator_type&
|
333 |
|
|
_M_get_allocator()
|
334 |
|
|
{ return _M_dataplus; }
|
335 |
|
|
|
336 |
|
|
const allocator_type&
|
337 |
|
|
_M_get_allocator() const
|
338 |
|
|
{ return _M_dataplus; }
|
339 |
|
|
|
340 |
|
|
void
|
341 |
|
|
_M_swap(__rc_string_base& __rcs);
|
342 |
|
|
|
343 |
|
|
void
|
344 |
|
|
_M_assign(const __rc_string_base& __rcs);
|
345 |
|
|
|
346 |
|
|
void
|
347 |
|
|
_M_reserve(size_type __res);
|
348 |
|
|
|
349 |
|
|
void
|
350 |
|
|
_M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
|
351 |
|
|
size_type __len2);
|
352 |
|
|
|
353 |
|
|
void
|
354 |
|
|
_M_erase(size_type __pos, size_type __n);
|
355 |
|
|
|
356 |
|
|
void
|
357 |
|
|
_M_clear()
|
358 |
|
|
{ _M_erase(size_type(0), _M_length()); }
|
359 |
|
|
|
360 |
|
|
bool
|
361 |
|
|
_M_compare(const __rc_string_base&) const
|
362 |
|
|
{ return false; }
|
363 |
|
|
};
|
364 |
|
|
|
365 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
366 |
|
|
typename __rc_string_base<_CharT, _Traits, _Alloc>::_Rep_empty
|
367 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::_S_empty_rep;
|
368 |
|
|
|
369 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
370 |
|
|
typename __rc_string_base<_CharT, _Traits, _Alloc>::_Rep*
|
371 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::_Rep::
|
372 |
|
|
_S_create(size_type __capacity, size_type __old_capacity,
|
373 |
|
|
const _Alloc& __alloc)
|
374 |
|
|
{
|
375 |
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
376 |
|
|
// 83. String::npos vs. string::max_size()
|
377 |
|
|
if (__capacity > size_type(_S_max_size))
|
378 |
|
|
std::__throw_length_error(__N("__rc_string_base::_Rep::_S_create"));
|
379 |
|
|
|
380 |
|
|
// The standard places no restriction on allocating more memory
|
381 |
|
|
// than is strictly needed within this layer at the moment or as
|
382 |
|
|
// requested by an explicit application call to reserve().
|
383 |
|
|
|
384 |
|
|
// Many malloc implementations perform quite poorly when an
|
385 |
|
|
// application attempts to allocate memory in a stepwise fashion
|
386 |
|
|
// growing each allocation size by only 1 char. Additionally,
|
387 |
|
|
// it makes little sense to allocate less linear memory than the
|
388 |
|
|
// natural blocking size of the malloc implementation.
|
389 |
|
|
// Unfortunately, we would need a somewhat low-level calculation
|
390 |
|
|
// with tuned parameters to get this perfect for any particular
|
391 |
|
|
// malloc implementation. Fortunately, generalizations about
|
392 |
|
|
// common features seen among implementations seems to suffice.
|
393 |
|
|
|
394 |
|
|
// __pagesize need not match the actual VM page size for good
|
395 |
|
|
// results in practice, thus we pick a common value on the low
|
396 |
|
|
// side. __malloc_header_size is an estimate of the amount of
|
397 |
|
|
// overhead per memory allocation (in practice seen N * sizeof
|
398 |
|
|
// (void*) where N is 0, 2 or 4). According to folklore,
|
399 |
|
|
// picking this value on the high side is better than
|
400 |
|
|
// low-balling it (especially when this algorithm is used with
|
401 |
|
|
// malloc implementations that allocate memory blocks rounded up
|
402 |
|
|
// to a size which is a power of 2).
|
403 |
|
|
const size_type __pagesize = 4096;
|
404 |
|
|
const size_type __malloc_header_size = 4 * sizeof(void*);
|
405 |
|
|
|
406 |
|
|
// The below implements an exponential growth policy, necessary to
|
407 |
|
|
// meet amortized linear time requirements of the library: see
|
408 |
|
|
// http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
|
409 |
|
|
if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
|
410 |
|
|
{
|
411 |
|
|
__capacity = 2 * __old_capacity;
|
412 |
|
|
// Never allocate a string bigger than _S_max_size.
|
413 |
|
|
if (__capacity > size_type(_S_max_size))
|
414 |
|
|
__capacity = size_type(_S_max_size);
|
415 |
|
|
}
|
416 |
|
|
|
417 |
|
|
// NB: Need an array of char_type[__capacity], plus a terminating
|
418 |
|
|
// null char_type() element, plus enough for the _Rep data structure,
|
419 |
|
|
// plus sizeof(_Rep) - 1 to upper round to a size multiple of
|
420 |
|
|
// sizeof(_Rep).
|
421 |
|
|
// Whew. Seemingly so needy, yet so elemental.
|
422 |
|
|
size_type __size = ((__capacity + 1) * sizeof(_CharT)
|
423 |
|
|
+ 2 * sizeof(_Rep) - 1);
|
424 |
|
|
|
425 |
|
|
const size_type __adj_size = __size + __malloc_header_size;
|
426 |
|
|
if (__adj_size > __pagesize && __capacity > __old_capacity)
|
427 |
|
|
{
|
428 |
|
|
const size_type __extra = __pagesize - __adj_size % __pagesize;
|
429 |
|
|
__capacity += __extra / sizeof(_CharT);
|
430 |
|
|
if (__capacity > size_type(_S_max_size))
|
431 |
|
|
__capacity = size_type(_S_max_size);
|
432 |
|
|
__size = (__capacity + 1) * sizeof(_CharT) + 2 * sizeof(_Rep) - 1;
|
433 |
|
|
}
|
434 |
|
|
|
435 |
|
|
// NB: Might throw, but no worries about a leak, mate: _Rep()
|
436 |
|
|
// does not throw.
|
437 |
|
|
_Rep* __place = _Rep_alloc_type(__alloc).allocate(__size / sizeof(_Rep));
|
438 |
|
|
_Rep* __p = new (__place) _Rep;
|
439 |
|
|
__p->_M_info._M_capacity = __capacity;
|
440 |
|
|
return __p;
|
441 |
|
|
}
|
442 |
|
|
|
443 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
444 |
|
|
void
|
445 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::_Rep::
|
446 |
|
|
_M_destroy(const _Alloc& __a) throw ()
|
447 |
|
|
{
|
448 |
|
|
const size_type __size = ((_M_info._M_capacity + 1) * sizeof(_CharT)
|
449 |
|
|
+ 2 * sizeof(_Rep) - 1);
|
450 |
|
|
_Rep_alloc_type(__a).deallocate(this, __size / sizeof(_Rep));
|
451 |
|
|
}
|
452 |
|
|
|
453 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
454 |
|
|
_CharT*
|
455 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::_Rep::
|
456 |
|
|
_M_clone(const _Alloc& __alloc, size_type __res)
|
457 |
|
|
{
|
458 |
|
|
// Requested capacity of the clone.
|
459 |
|
|
const size_type __requested_cap = _M_info._M_length + __res;
|
460 |
|
|
_Rep* __r = _Rep::_S_create(__requested_cap, _M_info._M_capacity,
|
461 |
|
|
__alloc);
|
462 |
|
|
|
463 |
|
|
if (_M_info._M_length)
|
464 |
|
|
__rc_string_base::_S_copy(__r->_M_refdata(), _M_refdata(), _M_info._M_length);
|
465 |
|
|
|
466 |
|
|
__r->_M_set_length(_M_info._M_length);
|
467 |
|
|
return __r->_M_refdata();
|
468 |
|
|
}
|
469 |
|
|
|
470 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
471 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
472 |
|
|
__rc_string_base(const _Alloc& __a)
|
473 |
|
|
: _M_dataplus(__a, _S_construct(size_type(), _CharT(), __a)) { }
|
474 |
|
|
|
475 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
476 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
477 |
|
|
__rc_string_base(const __rc_string_base& __rcs)
|
478 |
|
|
: _M_dataplus(__rcs._M_get_allocator(),
|
479 |
|
|
__rcs._M_grab(__rcs._M_get_allocator())) { }
|
480 |
|
|
|
481 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
482 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
483 |
|
|
__rc_string_base(size_type __n, _CharT __c, const _Alloc& __a)
|
484 |
|
|
: _M_dataplus(__a, _S_construct(__n, __c, __a)) { }
|
485 |
|
|
|
486 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
487 |
|
|
template<typename _InputIterator>
|
488 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
489 |
|
|
__rc_string_base(_InputIterator __beg, _InputIterator __end,
|
490 |
|
|
const _Alloc& __a)
|
491 |
|
|
: _M_dataplus(__a, _S_construct(__beg, __end, __a)) { }
|
492 |
|
|
|
493 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
494 |
|
|
void
|
495 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
496 |
|
|
_M_leak_hard()
|
497 |
|
|
{
|
498 |
|
|
if (_M_is_shared())
|
499 |
|
|
_M_erase(0, 0);
|
500 |
|
|
_M_set_leaked();
|
501 |
|
|
}
|
502 |
|
|
|
503 |
|
|
// NB: This is the special case for Input Iterators, used in
|
504 |
|
|
// istreambuf_iterators, etc.
|
505 |
|
|
// Input Iterators have a cost structure very different from
|
506 |
|
|
// pointers, calling for a different coding style.
|
507 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
508 |
|
|
template<typename _InIterator>
|
509 |
|
|
_CharT*
|
510 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
511 |
|
|
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
|
512 |
|
|
std::input_iterator_tag)
|
513 |
|
|
{
|
514 |
|
|
if (__beg == __end && __a == _Alloc())
|
515 |
|
|
return _S_empty_rep._M_refcopy();
|
516 |
|
|
|
517 |
|
|
// Avoid reallocation for common case.
|
518 |
|
|
_CharT __buf[128];
|
519 |
|
|
size_type __len = 0;
|
520 |
|
|
while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
|
521 |
|
|
{
|
522 |
|
|
__buf[__len++] = *__beg;
|
523 |
|
|
++__beg;
|
524 |
|
|
}
|
525 |
|
|
_Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
|
526 |
|
|
_S_copy(__r->_M_refdata(), __buf, __len);
|
527 |
|
|
__try
|
528 |
|
|
{
|
529 |
|
|
while (__beg != __end)
|
530 |
|
|
{
|
531 |
|
|
if (__len == __r->_M_info._M_capacity)
|
532 |
|
|
{
|
533 |
|
|
// Allocate more space.
|
534 |
|
|
_Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
|
535 |
|
|
_S_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
|
536 |
|
|
__r->_M_destroy(__a);
|
537 |
|
|
__r = __another;
|
538 |
|
|
}
|
539 |
|
|
__r->_M_refdata()[__len++] = *__beg;
|
540 |
|
|
++__beg;
|
541 |
|
|
}
|
542 |
|
|
}
|
543 |
|
|
__catch(...)
|
544 |
|
|
{
|
545 |
|
|
__r->_M_destroy(__a);
|
546 |
|
|
__throw_exception_again;
|
547 |
|
|
}
|
548 |
|
|
__r->_M_set_length(__len);
|
549 |
|
|
return __r->_M_refdata();
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
553 |
|
|
template<typename _InIterator>
|
554 |
|
|
_CharT*
|
555 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
556 |
|
|
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
|
557 |
|
|
std::forward_iterator_tag)
|
558 |
|
|
{
|
559 |
|
|
if (__beg == __end && __a == _Alloc())
|
560 |
|
|
return _S_empty_rep._M_refcopy();
|
561 |
|
|
|
562 |
|
|
// NB: Not required, but considered best practice.
|
563 |
|
|
if (__is_null_pointer(__beg) && __beg != __end)
|
564 |
|
|
std::__throw_logic_error(__N("__rc_string_base::"
|
565 |
|
|
"_S_construct null not valid"));
|
566 |
|
|
|
567 |
|
|
const size_type __dnew = static_cast<size_type>(std::distance(__beg,
|
568 |
|
|
__end));
|
569 |
|
|
// Check for out_of_range and length_error exceptions.
|
570 |
|
|
_Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
|
571 |
|
|
__try
|
572 |
|
|
{ __rc_string_base::_S_copy_chars(__r->_M_refdata(), __beg, __end); }
|
573 |
|
|
__catch(...)
|
574 |
|
|
{
|
575 |
|
|
__r->_M_destroy(__a);
|
576 |
|
|
__throw_exception_again;
|
577 |
|
|
}
|
578 |
|
|
__r->_M_set_length(__dnew);
|
579 |
|
|
return __r->_M_refdata();
|
580 |
|
|
}
|
581 |
|
|
|
582 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
583 |
|
|
_CharT*
|
584 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
585 |
|
|
_S_construct(size_type __n, _CharT __c, const _Alloc& __a)
|
586 |
|
|
{
|
587 |
|
|
if (__n == 0 && __a == _Alloc())
|
588 |
|
|
return _S_empty_rep._M_refcopy();
|
589 |
|
|
|
590 |
|
|
// Check for out_of_range and length_error exceptions.
|
591 |
|
|
_Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
|
592 |
|
|
if (__n)
|
593 |
|
|
__rc_string_base::_S_assign(__r->_M_refdata(), __n, __c);
|
594 |
|
|
|
595 |
|
|
__r->_M_set_length(__n);
|
596 |
|
|
return __r->_M_refdata();
|
597 |
|
|
}
|
598 |
|
|
|
599 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
600 |
|
|
void
|
601 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
602 |
|
|
_M_swap(__rc_string_base& __rcs)
|
603 |
|
|
{
|
604 |
|
|
if (_M_is_leaked())
|
605 |
|
|
_M_set_sharable();
|
606 |
|
|
if (__rcs._M_is_leaked())
|
607 |
|
|
__rcs._M_set_sharable();
|
608 |
|
|
|
609 |
|
|
_CharT* __tmp = _M_data();
|
610 |
|
|
_M_data(__rcs._M_data());
|
611 |
|
|
__rcs._M_data(__tmp);
|
612 |
|
|
|
613 |
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
614 |
|
|
// 431. Swapping containers with unequal allocators.
|
615 |
|
|
std::__alloc_swap<allocator_type>::_S_do_it(_M_get_allocator(),
|
616 |
|
|
__rcs._M_get_allocator());
|
617 |
|
|
}
|
618 |
|
|
|
619 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
620 |
|
|
void
|
621 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
622 |
|
|
_M_assign(const __rc_string_base& __rcs)
|
623 |
|
|
{
|
624 |
|
|
if (_M_rep() != __rcs._M_rep())
|
625 |
|
|
{
|
626 |
|
|
_CharT* __tmp = __rcs._M_grab(_M_get_allocator());
|
627 |
|
|
_M_dispose();
|
628 |
|
|
_M_data(__tmp);
|
629 |
|
|
}
|
630 |
|
|
}
|
631 |
|
|
|
632 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
633 |
|
|
void
|
634 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
635 |
|
|
_M_reserve(size_type __res)
|
636 |
|
|
{
|
637 |
|
|
// Make sure we don't shrink below the current size.
|
638 |
|
|
if (__res < _M_length())
|
639 |
|
|
__res = _M_length();
|
640 |
|
|
|
641 |
|
|
if (__res != _M_capacity() || _M_is_shared())
|
642 |
|
|
{
|
643 |
|
|
_CharT* __tmp = _M_rep()->_M_clone(_M_get_allocator(),
|
644 |
|
|
__res - _M_length());
|
645 |
|
|
_M_dispose();
|
646 |
|
|
_M_data(__tmp);
|
647 |
|
|
}
|
648 |
|
|
}
|
649 |
|
|
|
650 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
651 |
|
|
void
|
652 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
653 |
|
|
_M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
|
654 |
|
|
size_type __len2)
|
655 |
|
|
{
|
656 |
|
|
const size_type __how_much = _M_length() - __pos - __len1;
|
657 |
|
|
|
658 |
|
|
_Rep* __r = _Rep::_S_create(_M_length() + __len2 - __len1,
|
659 |
|
|
_M_capacity(), _M_get_allocator());
|
660 |
|
|
|
661 |
|
|
if (__pos)
|
662 |
|
|
this->_S_copy(__r->_M_refdata(), _M_data(), __pos);
|
663 |
|
|
if (__s && __len2)
|
664 |
|
|
this->_S_copy(__r->_M_refdata() + __pos, __s, __len2);
|
665 |
|
|
if (__how_much)
|
666 |
|
|
this->_S_copy(__r->_M_refdata() + __pos + __len2,
|
667 |
|
|
_M_data() + __pos + __len1, __how_much);
|
668 |
|
|
|
669 |
|
|
_M_dispose();
|
670 |
|
|
_M_data(__r->_M_refdata());
|
671 |
|
|
}
|
672 |
|
|
|
673 |
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
674 |
|
|
void
|
675 |
|
|
__rc_string_base<_CharT, _Traits, _Alloc>::
|
676 |
|
|
_M_erase(size_type __pos, size_type __n)
|
677 |
|
|
{
|
678 |
|
|
const size_type __new_size = _M_length() - __n;
|
679 |
|
|
const size_type __how_much = _M_length() - __pos - __n;
|
680 |
|
|
|
681 |
|
|
if (_M_is_shared())
|
682 |
|
|
{
|
683 |
|
|
// Must reallocate.
|
684 |
|
|
_Rep* __r = _Rep::_S_create(__new_size, _M_capacity(),
|
685 |
|
|
_M_get_allocator());
|
686 |
|
|
|
687 |
|
|
if (__pos)
|
688 |
|
|
this->_S_copy(__r->_M_refdata(), _M_data(), __pos);
|
689 |
|
|
if (__how_much)
|
690 |
|
|
this->_S_copy(__r->_M_refdata() + __pos,
|
691 |
|
|
_M_data() + __pos + __n, __how_much);
|
692 |
|
|
|
693 |
|
|
_M_dispose();
|
694 |
|
|
_M_data(__r->_M_refdata());
|
695 |
|
|
}
|
696 |
|
|
else if (__how_much && __n)
|
697 |
|
|
{
|
698 |
|
|
// Work in-place.
|
699 |
|
|
this->_S_move(_M_data() + __pos,
|
700 |
|
|
_M_data() + __pos + __n, __how_much);
|
701 |
|
|
}
|
702 |
|
|
|
703 |
|
|
_M_rep()->_M_set_length(__new_size);
|
704 |
|
|
}
|
705 |
|
|
|
706 |
|
|
template<>
|
707 |
|
|
inline bool
|
708 |
|
|
__rc_string_base<char, std::char_traits<char>,
|
709 |
|
|
std::allocator<char> >::
|
710 |
|
|
_M_compare(const __rc_string_base& __rcs) const
|
711 |
|
|
{
|
712 |
|
|
if (_M_rep() == __rcs._M_rep())
|
713 |
|
|
return true;
|
714 |
|
|
return false;
|
715 |
|
|
}
|
716 |
|
|
|
717 |
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
718 |
|
|
template<>
|
719 |
|
|
inline bool
|
720 |
|
|
__rc_string_base<wchar_t, std::char_traits<wchar_t>,
|
721 |
|
|
std::allocator<wchar_t> >::
|
722 |
|
|
_M_compare(const __rc_string_base& __rcs) const
|
723 |
|
|
{
|
724 |
|
|
if (_M_rep() == __rcs._M_rep())
|
725 |
|
|
return true;
|
726 |
|
|
return false;
|
727 |
|
|
}
|
728 |
|
|
#endif
|
729 |
|
|
|
730 |
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
731 |
|
|
} // namespace
|
732 |
|
|
|
733 |
|
|
#endif /* _RC_STRING_BASE_H */
|