xref: /llvm-project/libcxx/include/codecvt (revision b9a2658a3e8bd13b0f9e7a8a440832a95b377216) 
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_CODECVT
11#define _LIBCPP_CODECVT
12
13/*
14    codecvt synopsis
15
16namespace std
17{
18
19enum codecvt_mode
20{
21    consume_header = 4,
22    generate_header = 2,
23    little_endian = 1
24};
25
26template <class Elem, unsigned long Maxcode = 0x10ffff,
27          codecvt_mode Mode = (codecvt_mode)0>
28class codecvt_utf8
29    : public codecvt<Elem, char, mbstate_t>
30{
31    explicit codecvt_utf8(size_t refs = 0);
32    ~codecvt_utf8();
33};
34
35template <class Elem, unsigned long Maxcode = 0x10ffff,
36          codecvt_mode Mode = (codecvt_mode)0>
37class codecvt_utf16
38    : public codecvt<Elem, char, mbstate_t>
39{
40    explicit codecvt_utf16(size_t refs = 0);
41    ~codecvt_utf16();
42};
43
44template <class Elem, unsigned long Maxcode = 0x10ffff,
45          codecvt_mode Mode = (codecvt_mode)0>
46class codecvt_utf8_utf16
47    : public codecvt<Elem, char, mbstate_t>
48{
49    explicit codecvt_utf8_utf16(size_t refs = 0);
50    ~codecvt_utf8_utf16();
51};
52
53}  // std
54
55*/
56
57#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
58#  include <__cxx03/codecvt>
59#else
60#  include <__config>
61#  include <__locale>
62#  include <version>
63
64#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
65#    pragma GCC system_header
66#  endif
67
68#  if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
69
70_LIBCPP_BEGIN_NAMESPACE_STD
71
72enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 };
73
74// codecvt_utf8
75
76template <class _Elem>
77class __codecvt_utf8;
78
79#    if _LIBCPP_HAS_WIDE_CHARACTERS
80template <>
81class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
82  unsigned long __maxcode_;
83  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
84  codecvt_mode __mode_;
85  _LIBCPP_SUPPRESS_DEPRECATED_POP
86
87public:
88  typedef wchar_t intern_type;
89  typedef char extern_type;
90  typedef mbstate_t state_type;
91
92  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
93  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
94      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
95  _LIBCPP_SUPPRESS_DEPRECATED_POP
96
97protected:
98  result do_out(state_type& __st,
99                const intern_type* __frm,
100                const intern_type* __frm_end,
101                const intern_type*& __frm_nxt,
102                extern_type* __to,
103                extern_type* __to_end,
104                extern_type*& __to_nxt) const override;
105  result do_in(state_type& __st,
106               const extern_type* __frm,
107               const extern_type* __frm_end,
108               const extern_type*& __frm_nxt,
109               intern_type* __to,
110               intern_type* __to_end,
111               intern_type*& __to_nxt) const override;
112  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
113  int do_encoding() const _NOEXCEPT override;
114  bool do_always_noconv() const _NOEXCEPT override;
115  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
116  int do_max_length() const _NOEXCEPT override;
117};
118#    endif // _LIBCPP_HAS_WIDE_CHARACTERS
119
120_LIBCPP_SUPPRESS_DEPRECATED_PUSH
121template <>
122class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char16_t> : public codecvt<char16_t, char, mbstate_t> {
123  unsigned long __maxcode_;
124  codecvt_mode __mode_;
125
126public:
127  typedef char16_t intern_type;
128  typedef char extern_type;
129  typedef mbstate_t state_type;
130
131  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
132      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
133  _LIBCPP_SUPPRESS_DEPRECATED_POP
134
135protected:
136  result do_out(state_type& __st,
137                const intern_type* __frm,
138                const intern_type* __frm_end,
139                const intern_type*& __frm_nxt,
140                extern_type* __to,
141                extern_type* __to_end,
142                extern_type*& __to_nxt) const override;
143  result do_in(state_type& __st,
144               const extern_type* __frm,
145               const extern_type* __frm_end,
146               const extern_type*& __frm_nxt,
147               intern_type* __to,
148               intern_type* __to_end,
149               intern_type*& __to_nxt) const override;
150  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
151  int do_encoding() const _NOEXCEPT override;
152  bool do_always_noconv() const _NOEXCEPT override;
153  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
154  int do_max_length() const _NOEXCEPT override;
155};
156
157_LIBCPP_SUPPRESS_DEPRECATED_PUSH
158template <>
159class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char32_t> : public codecvt<char32_t, char, mbstate_t> {
160  unsigned long __maxcode_;
161  codecvt_mode __mode_;
162
163public:
164  typedef char32_t intern_type;
165  typedef char extern_type;
166  typedef mbstate_t state_type;
167
168  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
169      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
170  _LIBCPP_SUPPRESS_DEPRECATED_POP
171
172protected:
173  result do_out(state_type& __st,
174                const intern_type* __frm,
175                const intern_type* __frm_end,
176                const intern_type*& __frm_nxt,
177                extern_type* __to,
178                extern_type* __to_end,
179                extern_type*& __to_nxt) const override;
180  result do_in(state_type& __st,
181               const extern_type* __frm,
182               const extern_type* __frm_end,
183               const extern_type*& __frm_nxt,
184               intern_type* __to,
185               intern_type* __to_end,
186               intern_type*& __to_nxt) const override;
187  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
188  int do_encoding() const _NOEXCEPT override;
189  bool do_always_noconv() const _NOEXCEPT override;
190  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
191  int do_max_length() const _NOEXCEPT override;
192};
193
194_LIBCPP_SUPPRESS_DEPRECATED_PUSH
195template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
196class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8 : public __codecvt_utf8<_Elem> {
197public:
198  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8(size_t __refs = 0) : __codecvt_utf8<_Elem>(__refs, _Maxcode, _Mode) {}
199
200  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8() {}
201};
202_LIBCPP_SUPPRESS_DEPRECATED_POP
203
204// codecvt_utf16
205
206template <class _Elem, bool _LittleEndian>
207class __codecvt_utf16;
208
209#    if _LIBCPP_HAS_WIDE_CHARACTERS
210template <>
211class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, false> : public codecvt<wchar_t, char, mbstate_t> {
212  unsigned long __maxcode_;
213  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
214  codecvt_mode __mode_;
215  _LIBCPP_SUPPRESS_DEPRECATED_POP
216
217public:
218  typedef wchar_t intern_type;
219  typedef char extern_type;
220  typedef mbstate_t state_type;
221
222  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
223  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
224      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
225  _LIBCPP_SUPPRESS_DEPRECATED_POP
226
227protected:
228  result do_out(state_type& __st,
229                const intern_type* __frm,
230                const intern_type* __frm_end,
231                const intern_type*& __frm_nxt,
232                extern_type* __to,
233                extern_type* __to_end,
234                extern_type*& __to_nxt) const override;
235  result do_in(state_type& __st,
236               const extern_type* __frm,
237               const extern_type* __frm_end,
238               const extern_type*& __frm_nxt,
239               intern_type* __to,
240               intern_type* __to_end,
241               intern_type*& __to_nxt) const override;
242  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
243  int do_encoding() const _NOEXCEPT override;
244  bool do_always_noconv() const _NOEXCEPT override;
245  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
246  int do_max_length() const _NOEXCEPT override;
247};
248
249template <>
250class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, true> : public codecvt<wchar_t, char, mbstate_t> {
251  unsigned long __maxcode_;
252  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
253  codecvt_mode __mode_;
254  _LIBCPP_SUPPRESS_DEPRECATED_POP
255
256public:
257  typedef wchar_t intern_type;
258  typedef char extern_type;
259  typedef mbstate_t state_type;
260
261  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
262  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
263      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
264  _LIBCPP_SUPPRESS_DEPRECATED_POP
265
266protected:
267  result do_out(state_type& __st,
268                const intern_type* __frm,
269                const intern_type* __frm_end,
270                const intern_type*& __frm_nxt,
271                extern_type* __to,
272                extern_type* __to_end,
273                extern_type*& __to_nxt) const override;
274  result do_in(state_type& __st,
275               const extern_type* __frm,
276               const extern_type* __frm_end,
277               const extern_type*& __frm_nxt,
278               intern_type* __to,
279               intern_type* __to_end,
280               intern_type*& __to_nxt) const override;
281  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
282  int do_encoding() const _NOEXCEPT override;
283  bool do_always_noconv() const _NOEXCEPT override;
284  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
285  int do_max_length() const _NOEXCEPT override;
286};
287#    endif // _LIBCPP_HAS_WIDE_CHARACTERS
288
289_LIBCPP_SUPPRESS_DEPRECATED_PUSH
290template <>
291class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, false> : public codecvt<char16_t, char, mbstate_t> {
292  unsigned long __maxcode_;
293  codecvt_mode __mode_;
294
295public:
296  typedef char16_t intern_type;
297  typedef char extern_type;
298  typedef mbstate_t state_type;
299
300  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
301      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
302  _LIBCPP_SUPPRESS_DEPRECATED_POP
303
304protected:
305  result do_out(state_type& __st,
306                const intern_type* __frm,
307                const intern_type* __frm_end,
308                const intern_type*& __frm_nxt,
309                extern_type* __to,
310                extern_type* __to_end,
311                extern_type*& __to_nxt) const override;
312  result do_in(state_type& __st,
313               const extern_type* __frm,
314               const extern_type* __frm_end,
315               const extern_type*& __frm_nxt,
316               intern_type* __to,
317               intern_type* __to_end,
318               intern_type*& __to_nxt) const override;
319  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
320  int do_encoding() const _NOEXCEPT override;
321  bool do_always_noconv() const _NOEXCEPT override;
322  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
323  int do_max_length() const _NOEXCEPT override;
324};
325
326_LIBCPP_SUPPRESS_DEPRECATED_PUSH
327template <>
328class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, true> : public codecvt<char16_t, char, mbstate_t> {
329  unsigned long __maxcode_;
330  codecvt_mode __mode_;
331
332public:
333  typedef char16_t intern_type;
334  typedef char extern_type;
335  typedef mbstate_t state_type;
336
337  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
338      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
339  _LIBCPP_SUPPRESS_DEPRECATED_POP
340
341protected:
342  result do_out(state_type& __st,
343                const intern_type* __frm,
344                const intern_type* __frm_end,
345                const intern_type*& __frm_nxt,
346                extern_type* __to,
347                extern_type* __to_end,
348                extern_type*& __to_nxt) const override;
349  result do_in(state_type& __st,
350               const extern_type* __frm,
351               const extern_type* __frm_end,
352               const extern_type*& __frm_nxt,
353               intern_type* __to,
354               intern_type* __to_end,
355               intern_type*& __to_nxt) const override;
356  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
357  int do_encoding() const _NOEXCEPT override;
358  bool do_always_noconv() const _NOEXCEPT override;
359  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
360  int do_max_length() const _NOEXCEPT override;
361};
362
363_LIBCPP_SUPPRESS_DEPRECATED_PUSH
364template <>
365class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, false> : public codecvt<char32_t, char, mbstate_t> {
366  unsigned long __maxcode_;
367  codecvt_mode __mode_;
368
369public:
370  typedef char32_t intern_type;
371  typedef char extern_type;
372  typedef mbstate_t state_type;
373
374  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
375      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
376  _LIBCPP_SUPPRESS_DEPRECATED_POP
377
378protected:
379  result do_out(state_type& __st,
380                const intern_type* __frm,
381                const intern_type* __frm_end,
382                const intern_type*& __frm_nxt,
383                extern_type* __to,
384                extern_type* __to_end,
385                extern_type*& __to_nxt) const override;
386  result do_in(state_type& __st,
387               const extern_type* __frm,
388               const extern_type* __frm_end,
389               const extern_type*& __frm_nxt,
390               intern_type* __to,
391               intern_type* __to_end,
392               intern_type*& __to_nxt) const override;
393  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
394  int do_encoding() const _NOEXCEPT override;
395  bool do_always_noconv() const _NOEXCEPT override;
396  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
397  int do_max_length() const _NOEXCEPT override;
398};
399
400_LIBCPP_SUPPRESS_DEPRECATED_PUSH
401template <>
402class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, true> : public codecvt<char32_t, char, mbstate_t> {
403  unsigned long __maxcode_;
404  codecvt_mode __mode_;
405
406public:
407  typedef char32_t intern_type;
408  typedef char extern_type;
409  typedef mbstate_t state_type;
410
411  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
412      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
413  _LIBCPP_SUPPRESS_DEPRECATED_POP
414
415protected:
416  result do_out(state_type& __st,
417                const intern_type* __frm,
418                const intern_type* __frm_end,
419                const intern_type*& __frm_nxt,
420                extern_type* __to,
421                extern_type* __to_end,
422                extern_type*& __to_nxt) const override;
423  result do_in(state_type& __st,
424               const extern_type* __frm,
425               const extern_type* __frm_end,
426               const extern_type*& __frm_nxt,
427               intern_type* __to,
428               intern_type* __to_end,
429               intern_type*& __to_nxt) const override;
430  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
431  int do_encoding() const _NOEXCEPT override;
432  bool do_always_noconv() const _NOEXCEPT override;
433  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
434  int do_max_length() const _NOEXCEPT override;
435};
436
437_LIBCPP_SUPPRESS_DEPRECATED_PUSH
438template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
439class _LIBCPP_TEMPLATE_VIS
440_LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf16 : public __codecvt_utf16<_Elem, _Mode & little_endian> {
441public:
442  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf16(size_t __refs = 0)
443      : __codecvt_utf16<_Elem, _Mode & little_endian>(__refs, _Maxcode, _Mode) {}
444
445  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf16() {}
446};
447_LIBCPP_SUPPRESS_DEPRECATED_POP
448
449// codecvt_utf8_utf16
450
451template <class _Elem>
452class __codecvt_utf8_utf16;
453
454#    if _LIBCPP_HAS_WIDE_CHARACTERS
455template <>
456class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
457  unsigned long __maxcode_;
458  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
459  codecvt_mode __mode_;
460  _LIBCPP_SUPPRESS_DEPRECATED_POP
461
462public:
463  typedef wchar_t intern_type;
464  typedef char extern_type;
465  typedef mbstate_t state_type;
466
467  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
468  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
469      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
470  _LIBCPP_SUPPRESS_DEPRECATED_POP
471
472protected:
473  result do_out(state_type& __st,
474                const intern_type* __frm,
475                const intern_type* __frm_end,
476                const intern_type*& __frm_nxt,
477                extern_type* __to,
478                extern_type* __to_end,
479                extern_type*& __to_nxt) const override;
480  result do_in(state_type& __st,
481               const extern_type* __frm,
482               const extern_type* __frm_end,
483               const extern_type*& __frm_nxt,
484               intern_type* __to,
485               intern_type* __to_end,
486               intern_type*& __to_nxt) const override;
487  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
488  int do_encoding() const _NOEXCEPT override;
489  bool do_always_noconv() const _NOEXCEPT override;
490  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
491  int do_max_length() const _NOEXCEPT override;
492};
493#    endif // _LIBCPP_HAS_WIDE_CHARACTERS
494
495_LIBCPP_SUPPRESS_DEPRECATED_PUSH
496template <>
497class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char32_t> : public codecvt<char32_t, char, mbstate_t> {
498  unsigned long __maxcode_;
499  codecvt_mode __mode_;
500
501public:
502  typedef char32_t intern_type;
503  typedef char extern_type;
504  typedef mbstate_t state_type;
505
506  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
507      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
508  _LIBCPP_SUPPRESS_DEPRECATED_POP
509
510protected:
511  result do_out(state_type& __st,
512                const intern_type* __frm,
513                const intern_type* __frm_end,
514                const intern_type*& __frm_nxt,
515                extern_type* __to,
516                extern_type* __to_end,
517                extern_type*& __to_nxt) const override;
518  result do_in(state_type& __st,
519               const extern_type* __frm,
520               const extern_type* __frm_end,
521               const extern_type*& __frm_nxt,
522               intern_type* __to,
523               intern_type* __to_end,
524               intern_type*& __to_nxt) const override;
525  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
526  int do_encoding() const _NOEXCEPT override;
527  bool do_always_noconv() const _NOEXCEPT override;
528  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
529  int do_max_length() const _NOEXCEPT override;
530};
531
532_LIBCPP_SUPPRESS_DEPRECATED_PUSH
533template <>
534class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char16_t> : public codecvt<char16_t, char, mbstate_t> {
535  unsigned long __maxcode_;
536  codecvt_mode __mode_;
537
538public:
539  typedef char16_t intern_type;
540  typedef char extern_type;
541  typedef mbstate_t state_type;
542
543  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
544      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
545  _LIBCPP_SUPPRESS_DEPRECATED_POP
546
547protected:
548  result do_out(state_type& __st,
549                const intern_type* __frm,
550                const intern_type* __frm_end,
551                const intern_type*& __frm_nxt,
552                extern_type* __to,
553                extern_type* __to_end,
554                extern_type*& __to_nxt) const override;
555  result do_in(state_type& __st,
556               const extern_type* __frm,
557               const extern_type* __frm_end,
558               const extern_type*& __frm_nxt,
559               intern_type* __to,
560               intern_type* __to_end,
561               intern_type*& __to_nxt) const override;
562  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
563  int do_encoding() const _NOEXCEPT override;
564  bool do_always_noconv() const _NOEXCEPT override;
565  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
566  int do_max_length() const _NOEXCEPT override;
567};
568
569_LIBCPP_SUPPRESS_DEPRECATED_PUSH
570template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
571class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8_utf16 : public __codecvt_utf8_utf16<_Elem> {
572public:
573  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8_utf16(size_t __refs = 0)
574      : __codecvt_utf8_utf16<_Elem>(__refs, _Maxcode, _Mode) {}
575
576  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8_utf16() {}
577};
578_LIBCPP_SUPPRESS_DEPRECATED_POP
579
580_LIBCPP_END_NAMESPACE_STD
581
582#  endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
583
584#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
585#    include <atomic>
586#    include <concepts>
587#    include <cstddef>
588#    include <cstdlib>
589#    include <cstring>
590#    include <initializer_list>
591#    include <iosfwd>
592#    include <limits>
593#    include <mutex>
594#    include <new>
595#    include <stdexcept>
596#    include <type_traits>
597#    include <typeinfo>
598#  endif
599#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
600
601#endif // _LIBCPP_CODECVT
602