summaryrefslogtreecommitdiff
path: root/data/iphoneos-sdk/v1/system_error
blob: c577edceee8263556f8b4367a731141398e1d8ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
// -*- C++ -*-
//===---------------------------- system_error ----------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_SYSTEM_ERROR
#define _LIBCPP_SYSTEM_ERROR

/*
    system_error synopsis

namespace std
{

class error_category
{
public:
    virtual ~error_category() noexcept;

    constexpr error_category();
    error_category(const error_category&) = delete;
    error_category& operator=(const error_category&) = delete;

    virtual const char* name() const noexcept = 0;
    virtual error_condition default_error_condition(int ev) const noexcept;
    virtual bool equivalent(int code, const error_condition& condition) const noexcept;
    virtual bool equivalent(const error_code& code, int condition) const noexcept;
    virtual string message(int ev) const = 0;

    bool operator==(const error_category& rhs) const noexcept;
    bool operator!=(const error_category& rhs) const noexcept;
    bool operator<(const error_category& rhs) const noexcept;
};

const error_category& generic_category() noexcept;
const error_category& system_category() noexcept;

template <class T> struct is_error_code_enum
    : public false_type {};

template <class T> struct is_error_condition_enum
    : public false_type {};

template <class _Tp>
inline constexpr size_t is_error_condition_enum_v = is_error_condition_enum<_Tp>::value; // C++17

template <class _Tp>
inline constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value; // C++17

class error_code
{
public:
    // constructors:
    error_code() noexcept;
    error_code(int val, const error_category& cat) noexcept;
    template <class ErrorCodeEnum>
        error_code(ErrorCodeEnum e) noexcept;

    // modifiers:
    void assign(int val, const error_category& cat) noexcept;
    template <class ErrorCodeEnum>
        error_code& operator=(ErrorCodeEnum e) noexcept;
    void clear() noexcept;

    // observers:
    int value() const noexcept;
    const error_category& category() const noexcept;
    error_condition default_error_condition() const noexcept;
    string message() const;
    explicit operator bool() const noexcept;
};

// non-member functions:
bool operator<(const error_code& lhs, const error_code& rhs) noexcept;
template <class charT, class traits>
    basic_ostream<charT,traits>&
    operator<<(basic_ostream<charT,traits>& os, const error_code& ec);

class error_condition
{
public:
    // constructors:
    error_condition() noexcept;
    error_condition(int val, const error_category& cat) noexcept;
    template <class ErrorConditionEnum>
        error_condition(ErrorConditionEnum e) noexcept;

    // modifiers:
    void assign(int val, const error_category& cat) noexcept;
    template <class ErrorConditionEnum>
        error_condition& operator=(ErrorConditionEnum e) noexcept;
    void clear() noexcept;

    // observers:
    int value() const noexcept;
    const error_category& category() const noexcept;
    string message() const noexcept;
    explicit operator bool() const noexcept;
};

bool operator<(const error_condition& lhs, const error_condition& rhs) noexcept;

class system_error
    : public runtime_error
{
public:
    system_error(error_code ec, const string& what_arg);
    system_error(error_code ec, const char* what_arg);
    system_error(error_code ec);
    system_error(int ev, const error_category& ecat, const string& what_arg);
    system_error(int ev, const error_category& ecat, const char* what_arg);
    system_error(int ev, const error_category& ecat);

    const error_code& code() const noexcept;
    const char* what() const noexcept;
};

enum class errc
{
    address_family_not_supported,       // EAFNOSUPPORT
    address_in_use,                     // EADDRINUSE
    address_not_available,              // EADDRNOTAVAIL
    already_connected,                  // EISCONN
    argument_list_too_long,             // E2BIG
    argument_out_of_domain,             // EDOM
    bad_address,                        // EFAULT
    bad_file_descriptor,                // EBADF
    bad_message,                        // EBADMSG
    broken_pipe,                        // EPIPE
    connection_aborted,                 // ECONNABORTED
    connection_already_in_progress,     // EALREADY
    connection_refused,                 // ECONNREFUSED
    connection_reset,                   // ECONNRESET
    cross_device_link,                  // EXDEV
    destination_address_required,       // EDESTADDRREQ
    device_or_resource_busy,            // EBUSY
    directory_not_empty,                // ENOTEMPTY
    executable_format_error,            // ENOEXEC
    file_exists,                        // EEXIST
    file_too_large,                     // EFBIG
    filename_too_long,                  // ENAMETOOLONG
    function_not_supported,             // ENOSYS
    host_unreachable,                   // EHOSTUNREACH
    identifier_removed,                 // EIDRM
    illegal_byte_sequence,              // EILSEQ
    inappropriate_io_control_operation, // ENOTTY
    interrupted,                        // EINTR
    invalid_argument,                   // EINVAL
    invalid_seek,                       // ESPIPE
    io_error,                           // EIO
    is_a_directory,                     // EISDIR
    message_size,                       // EMSGSIZE
    network_down,                       // ENETDOWN
    network_reset,                      // ENETRESET
    network_unreachable,                // ENETUNREACH
    no_buffer_space,                    // ENOBUFS
    no_child_process,                   // ECHILD
    no_link,                            // ENOLINK
    no_lock_available,                  // ENOLCK
    no_message_available,               // ENODATA
    no_message,                         // ENOMSG
    no_protocol_option,                 // ENOPROTOOPT
    no_space_on_device,                 // ENOSPC
    no_stream_resources,                // ENOSR
    no_such_device_or_address,          // ENXIO
    no_such_device,                     // ENODEV
    no_such_file_or_directory,          // ENOENT
    no_such_process,                    // ESRCH
    not_a_directory,                    // ENOTDIR
    not_a_socket,                       // ENOTSOCK
    not_a_stream,                       // ENOSTR
    not_connected,                      // ENOTCONN
    not_enough_memory,                  // ENOMEM
    not_supported,                      // ENOTSUP
    operation_canceled,                 // ECANCELED
    operation_in_progress,              // EINPROGRESS
    operation_not_permitted,            // EPERM
    operation_not_supported,            // EOPNOTSUPP
    operation_would_block,              // EWOULDBLOCK
    owner_dead,                         // EOWNERDEAD
    permission_denied,                  // EACCES
    protocol_error,                     // EPROTO
    protocol_not_supported,             // EPROTONOSUPPORT
    read_only_file_system,              // EROFS
    resource_deadlock_would_occur,      // EDEADLK
    resource_unavailable_try_again,     // EAGAIN
    result_out_of_range,                // ERANGE
    state_not_recoverable,              // ENOTRECOVERABLE
    stream_timeout,                     // ETIME
    text_file_busy,                     // ETXTBSY
    timed_out,                          // ETIMEDOUT
    too_many_files_open_in_system,      // ENFILE
    too_many_files_open,                // EMFILE
    too_many_links,                     // EMLINK
    too_many_symbolic_link_levels,      // ELOOP
    value_too_large,                    // EOVERFLOW
    wrong_protocol_type                 // EPROTOTYPE
};

template <> struct is_error_condition_enum<errc>
    : true_type { }

error_code make_error_code(errc e) noexcept;
error_condition make_error_condition(errc e) noexcept;

// Comparison operators:
bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
bool operator!=(const error_code& lhs, const error_code& rhs) noexcept;
bool operator!=(const error_code& lhs, const error_condition& rhs) noexcept;
bool operator!=(const error_condition& lhs, const error_code& rhs) noexcept;
bool operator!=(const error_condition& lhs, const error_condition& rhs) noexcept;

template <> struct hash<std::error_code>;
template <> struct hash<std::error_condition>;

}  // std

*/

#include <__config>
#include <cerrno>
#include <type_traits>
#include <stdexcept>
#include <__functional_base>
#include <string>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

// is_error_code_enum

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum
    : public false_type {};

#if _LIBCPP_STD_VER > 14
template <class _Tp>
_LIBCPP_INLINE_VAR constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value;
#endif

// is_error_condition_enum

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum
    : public false_type {};

#if _LIBCPP_STD_VER > 14
template <class _Tp>
_LIBCPP_INLINE_VAR constexpr size_t is_error_condition_enum_v = is_error_condition_enum<_Tp>::value;
#endif

// Some error codes are not present on all platforms, so we provide equivalents
// for them:

//enum class errc
_LIBCPP_DECLARE_STRONG_ENUM(errc)
{
    address_family_not_supported        = EAFNOSUPPORT,
    address_in_use                      = EADDRINUSE,
    address_not_available               = EADDRNOTAVAIL,
    already_connected                   = EISCONN,
    argument_list_too_long              = E2BIG,
    argument_out_of_domain              = EDOM,
    bad_address                         = EFAULT,
    bad_file_descriptor                 = EBADF,
    bad_message                         = EBADMSG,
    broken_pipe                         = EPIPE,
    connection_aborted                  = ECONNABORTED,
    connection_already_in_progress      = EALREADY,
    connection_refused                  = ECONNREFUSED,
    connection_reset                    = ECONNRESET,
    cross_device_link                   = EXDEV,
    destination_address_required        = EDESTADDRREQ,
    device_or_resource_busy             = EBUSY,
    directory_not_empty                 = ENOTEMPTY,
    executable_format_error             = ENOEXEC,
    file_exists                         = EEXIST,
    file_too_large                      = EFBIG,
    filename_too_long                   = ENAMETOOLONG,
    function_not_supported              = ENOSYS,
    host_unreachable                    = EHOSTUNREACH,
    identifier_removed                  = EIDRM,
    illegal_byte_sequence               = EILSEQ,
    inappropriate_io_control_operation  = ENOTTY,
    interrupted                         = EINTR,
    invalid_argument                    = EINVAL,
    invalid_seek                        = ESPIPE,
    io_error                            = EIO,
    is_a_directory                      = EISDIR,
    message_size                        = EMSGSIZE,
    network_down                        = ENETDOWN,
    network_reset                       = ENETRESET,
    network_unreachable                 = ENETUNREACH,
    no_buffer_space                     = ENOBUFS,
    no_child_process                    = ECHILD,
    no_link                             = ENOLINK,
    no_lock_available                   = ENOLCK,
#ifdef ENODATA
    no_message_available                = ENODATA,
#else
    no_message_available                = ENOMSG,
#endif
    no_message                          = ENOMSG,
    no_protocol_option                  = ENOPROTOOPT,
    no_space_on_device                  = ENOSPC,
#ifdef ENOSR
    no_stream_resources                 = ENOSR,
#else
    no_stream_resources                 = ENOMEM,
#endif
    no_such_device_or_address           = ENXIO,
    no_such_device                      = ENODEV,
    no_such_file_or_directory           = ENOENT,
    no_such_process                     = ESRCH,
    not_a_directory                     = ENOTDIR,
    not_a_socket                        = ENOTSOCK,
#ifdef ENOSTR
    not_a_stream                        = ENOSTR,
#else
    not_a_stream                        = EINVAL,
#endif
    not_connected                       = ENOTCONN,
    not_enough_memory                   = ENOMEM,
    not_supported                       = ENOTSUP,
    operation_canceled                  = ECANCELED,
    operation_in_progress               = EINPROGRESS,
    operation_not_permitted             = EPERM,
    operation_not_supported             = EOPNOTSUPP,
    operation_would_block               = EWOULDBLOCK,
    owner_dead                          = EOWNERDEAD,
    permission_denied                   = EACCES,
    protocol_error                      = EPROTO,
    protocol_not_supported              = EPROTONOSUPPORT,
    read_only_file_system               = EROFS,
    resource_deadlock_would_occur       = EDEADLK,
    resource_unavailable_try_again      = EAGAIN,
    result_out_of_range                 = ERANGE,
    state_not_recoverable               = ENOTRECOVERABLE,
#ifdef ETIME
    stream_timeout                      = ETIME,
#else
    stream_timeout                      = ETIMEDOUT,
#endif
    text_file_busy                      = ETXTBSY,
    timed_out                           = ETIMEDOUT,
    too_many_files_open_in_system       = ENFILE,
    too_many_files_open                 = EMFILE,
    too_many_links                      = EMLINK,
    too_many_symbolic_link_levels       = ELOOP,
    value_too_large                     = EOVERFLOW,
    wrong_protocol_type                 = EPROTOTYPE
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(errc)

template <>
struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc>
    : true_type { };

#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
template <>
struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx>
    : true_type { };
#endif

class _LIBCPP_TYPE_VIS error_condition;
class _LIBCPP_TYPE_VIS error_code;

// class error_category

class _LIBCPP_HIDDEN __do_message;

class _LIBCPP_TYPE_VIS error_category
{
public:
    virtual ~error_category() _NOEXCEPT;

#if defined(_LIBCPP_BUILDING_SYSTEM_ERROR) && \
    defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS)
    error_category() _NOEXCEPT;
#else
    _LIBCPP_ALWAYS_INLINE
    _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT _LIBCPP_DEFAULT
#endif
private:
    error_category(const error_category&);// = delete;
    error_category& operator=(const error_category&);// = delete;

public:
    virtual const char* name() const _NOEXCEPT = 0;
    virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
    virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
    virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
    virtual string message(int __ev) const = 0;

    _LIBCPP_ALWAYS_INLINE
    bool operator==(const error_category& __rhs) const _NOEXCEPT {return this == &__rhs;}

    _LIBCPP_ALWAYS_INLINE
    bool operator!=(const error_category& __rhs) const _NOEXCEPT {return !(*this == __rhs);}

    _LIBCPP_ALWAYS_INLINE
    bool operator< (const error_category& __rhs) const _NOEXCEPT {return this < &__rhs;}

    friend class _LIBCPP_HIDDEN __do_message;
};

class _LIBCPP_HIDDEN __do_message
    : public error_category
{
public:
    virtual string message(int ev) const;
};

_LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
_LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;

class _LIBCPP_TYPE_VIS error_condition
{
    int __val_;
    const error_category* __cat_;
public:
    _LIBCPP_ALWAYS_INLINE
    error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}

    _LIBCPP_ALWAYS_INLINE
    error_condition(int __val, const error_category& __cat) _NOEXCEPT
        : __val_(__val), __cat_(&__cat) {}

    template <class _Ep>
        _LIBCPP_ALWAYS_INLINE
        error_condition(_Ep __e,
              typename enable_if<is_error_condition_enum<_Ep>::value>::type* = 0
                                                                     ) _NOEXCEPT
            {*this = make_error_condition(__e);}

    _LIBCPP_ALWAYS_INLINE
    void assign(int __val, const error_category& __cat) _NOEXCEPT
    {
        __val_ = __val;
        __cat_ = &__cat;
    }

    template <class _Ep>
        _LIBCPP_ALWAYS_INLINE
        typename enable_if
        <
            is_error_condition_enum<_Ep>::value,
            error_condition&
        >::type
        operator=(_Ep __e) _NOEXCEPT
            {*this = make_error_condition(__e); return *this;}

    _LIBCPP_ALWAYS_INLINE
    void clear() _NOEXCEPT
    {
        __val_ = 0;
        __cat_ = &generic_category();
    }

    _LIBCPP_ALWAYS_INLINE
    int value() const _NOEXCEPT {return __val_;}

    _LIBCPP_ALWAYS_INLINE
    const error_category& category() const _NOEXCEPT {return *__cat_;}
    string message() const;

    _LIBCPP_ALWAYS_INLINE
        _LIBCPP_EXPLICIT
        operator bool() const _NOEXCEPT {return __val_ != 0;}
};

inline _LIBCPP_INLINE_VISIBILITY
error_condition
make_error_condition(errc __e) _NOEXCEPT
{
    return error_condition(static_cast<int>(__e), generic_category());
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{
    return __x.category() < __y.category()
        || (__x.category() == __y.category() && __x.value() < __y.value());
}

// error_code

class _LIBCPP_TYPE_VIS error_code
{
    int __val_;
    const error_category* __cat_;
public:
    _LIBCPP_ALWAYS_INLINE
    error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}

    _LIBCPP_ALWAYS_INLINE
    error_code(int __val, const error_category& __cat) _NOEXCEPT
        : __val_(__val), __cat_(&__cat) {}

    template <class _Ep>
        _LIBCPP_ALWAYS_INLINE
        error_code(_Ep __e,
                   typename enable_if<is_error_code_enum<_Ep>::value>::type* = 0
                                                                     ) _NOEXCEPT
            {*this = make_error_code(__e);}

    _LIBCPP_ALWAYS_INLINE
    void assign(int __val, const error_category& __cat) _NOEXCEPT
    {
        __val_ = __val;
        __cat_ = &__cat;
    }

    template <class _Ep>
        _LIBCPP_ALWAYS_INLINE
        typename enable_if
        <
            is_error_code_enum<_Ep>::value,
            error_code&
        >::type
        operator=(_Ep __e) _NOEXCEPT
            {*this = make_error_code(__e); return *this;}

    _LIBCPP_ALWAYS_INLINE
    void clear() _NOEXCEPT
    {
        __val_ = 0;
        __cat_ = &system_category();
    }

    _LIBCPP_ALWAYS_INLINE
    int value() const _NOEXCEPT {return __val_;}

    _LIBCPP_ALWAYS_INLINE
    const error_category& category() const _NOEXCEPT {return *__cat_;}

    _LIBCPP_ALWAYS_INLINE
    error_condition default_error_condition() const _NOEXCEPT
        {return __cat_->default_error_condition(__val_);}

    string message() const;

    _LIBCPP_ALWAYS_INLINE
        _LIBCPP_EXPLICIT
        operator bool() const _NOEXCEPT {return __val_ != 0;}
};

inline _LIBCPP_INLINE_VISIBILITY
error_code
make_error_code(errc __e) _NOEXCEPT
{
    return error_code(static_cast<int>(__e), generic_category());
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const error_code& __x, const error_code& __y) _NOEXCEPT
{
    return __x.category() < __y.category()
        || (__x.category() == __y.category() && __x.value() < __y.value());
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_code& __x, const error_code& __y) _NOEXCEPT
{
    return __x.category() == __y.category() && __x.value() == __y.value();
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT
{
    return __x.category().equivalent(__x.value(), __y)
        || __y.category().equivalent(__x, __y.value());
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT
{
    return __y == __x;
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{
    return __x.category() == __y.category() && __x.value() == __y.value();
}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
{return !(__x == __y);}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT
{return !(__x == __y);}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT
{return !(__x == __y);}

inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{return !(__x == __y);}

template <>
struct _LIBCPP_TEMPLATE_VIS hash<error_code>
    : public unary_function<error_code, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(const error_code& __ec) const _NOEXCEPT
    {
        return static_cast<size_t>(__ec.value());
    }
};

template <>
struct _LIBCPP_TEMPLATE_VIS hash<error_condition>
    : public unary_function<error_condition, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(const error_condition& __ec) const _NOEXCEPT
    {
        return static_cast<size_t>(__ec.value());
    }
};

// system_error

class _LIBCPP_TYPE_VIS system_error
    : public runtime_error
{
    error_code __ec_;
public:
    system_error(error_code __ec, const string& __what_arg);
    system_error(error_code __ec, const char* __what_arg);
    system_error(error_code __ec);
    system_error(int __ev, const error_category& __ecat, const string& __what_arg);
    system_error(int __ev, const error_category& __ecat, const char* __what_arg);
    system_error(int __ev, const error_category& __ecat);
    ~system_error() _NOEXCEPT;

    _LIBCPP_ALWAYS_INLINE
    const error_code& code() const _NOEXCEPT {return __ec_;}

private:
    static string __init(const error_code&, string);
};

_LIBCPP_NORETURN _LIBCPP_FUNC_VIS
void __throw_system_error(int ev, const char* what_arg);

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_SYSTEM_ERROR