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      1 // -*- C++ -*-
      2 //===---------------------------- ios -------------------------------------===//
      3 //
      4 //                     The LLVM Compiler Infrastructure
      5 //
      6 // This file is dual licensed under the MIT and the University of Illinois Open
      7 // Source Licenses. See LICENSE.TXT for details.
      8 //
      9 //===----------------------------------------------------------------------===//
     10 
     11 #ifndef _LIBCPP_IOS
     12 #define _LIBCPP_IOS
     13 
     14 /*
     15     ios synopsis
     16 
     17 #include <iosfwd>
     18 
     19 namespace std
     20 {
     21 
     22 typedef OFF_T streamoff;
     23 typedef SZ_T streamsize;
     24 template <class stateT> class fpos;
     25 
     26 class ios_base
     27 {
     28 public:
     29     class failure;
     30 
     31     typedef T1 fmtflags;
     32     static constexpr fmtflags boolalpha;
     33     static constexpr fmtflags dec;
     34     static constexpr fmtflags fixed;
     35     static constexpr fmtflags hex;
     36     static constexpr fmtflags internal;
     37     static constexpr fmtflags left;
     38     static constexpr fmtflags oct;
     39     static constexpr fmtflags right;
     40     static constexpr fmtflags scientific;
     41     static constexpr fmtflags showbase;
     42     static constexpr fmtflags showpoint;
     43     static constexpr fmtflags showpos;
     44     static constexpr fmtflags skipws;
     45     static constexpr fmtflags unitbuf;
     46     static constexpr fmtflags uppercase;
     47     static constexpr fmtflags adjustfield;
     48     static constexpr fmtflags basefield;
     49     static constexpr fmtflags floatfield;
     50 
     51     typedef T2 iostate;
     52     static constexpr iostate badbit;
     53     static constexpr iostate eofbit;
     54     static constexpr iostate failbit;
     55     static constexpr iostate goodbit;
     56 
     57     typedef T3 openmode;
     58     static constexpr openmode app;
     59     static constexpr openmode ate;
     60     static constexpr openmode binary;
     61     static constexpr openmode in;
     62     static constexpr openmode out;
     63     static constexpr openmode trunc;
     64 
     65     typedef T4 seekdir;
     66     static constexpr seekdir beg;
     67     static constexpr seekdir cur;
     68     static constexpr seekdir end;
     69 
     70     class Init;
     71 
     72     // 27.5.2.2 fmtflags state:
     73     fmtflags flags() const;
     74     fmtflags flags(fmtflags fmtfl);
     75     fmtflags setf(fmtflags fmtfl);
     76     fmtflags setf(fmtflags fmtfl, fmtflags mask);
     77     void unsetf(fmtflags mask);
     78 
     79     streamsize precision() const;
     80     streamsize precision(streamsize prec);
     81     streamsize width() const;
     82     streamsize width(streamsize wide);
     83 
     84     // 27.5.2.3 locales:
     85     locale imbue(const locale& loc);
     86     locale getloc() const;
     87 
     88     // 27.5.2.5 storage:
     89     static int xalloc();
     90     long& iword(int index);
     91     void*& pword(int index);
     92 
     93     // destructor
     94     virtual ~ios_base();
     95 
     96     // 27.5.2.6 callbacks;
     97     enum event { erase_event, imbue_event, copyfmt_event };
     98     typedef void (*event_callback)(event, ios_base&, int index);
     99     void register_callback(event_callback fn, int index);
    100 
    101     ios_base(const ios_base&) = delete;
    102     ios_base& operator=(const ios_base&) = delete;
    103 
    104     static bool sync_with_stdio(bool sync = true);
    105 
    106 protected:
    107     ios_base();
    108 };
    109 
    110 template <class charT, class traits = char_traits<charT> >
    111 class basic_ios
    112     : public ios_base
    113 {
    114 public:
    115     // types:
    116     typedef charT char_type;
    117     typedef typename traits::int_type int_type;  // removed in C++17
    118     typedef typename traits::pos_type pos_type;  // removed in C++17
    119     typedef typename traits::off_type off_type;  // removed in C++17
    120     typedef traits traits_type;
    121 
    122     operator unspecified-bool-type() const;
    123     bool operator!() const;
    124     iostate rdstate() const;
    125     void clear(iostate state = goodbit);
    126     void setstate(iostate state);
    127     bool good() const;
    128     bool eof() const;
    129     bool fail() const;
    130     bool bad() const;
    131 
    132     iostate exceptions() const;
    133     void exceptions(iostate except);
    134 
    135     // 27.5.4.1 Constructor/destructor:
    136     explicit basic_ios(basic_streambuf<charT,traits>* sb);
    137     virtual ~basic_ios();
    138 
    139     // 27.5.4.2 Members:
    140     basic_ostream<charT,traits>* tie() const;
    141     basic_ostream<charT,traits>* tie(basic_ostream<charT,traits>* tiestr);
    142 
    143     basic_streambuf<charT,traits>* rdbuf() const;
    144     basic_streambuf<charT,traits>* rdbuf(basic_streambuf<charT,traits>* sb);
    145 
    146     basic_ios& copyfmt(const basic_ios& rhs);
    147 
    148     char_type fill() const;
    149     char_type fill(char_type ch);
    150 
    151     locale imbue(const locale& loc);
    152 
    153     char narrow(char_type c, char dfault) const;
    154     char_type widen(char c) const;
    155 
    156     basic_ios(const basic_ios& ) = delete;
    157     basic_ios& operator=(const basic_ios&) = delete;
    158 
    159 protected:
    160     basic_ios();
    161     void init(basic_streambuf<charT,traits>* sb);
    162     void move(basic_ios& rhs);
    163     void swap(basic_ios& rhs) noexcept;
    164     void set_rdbuf(basic_streambuf<charT, traits>* sb);
    165 };
    166 
    167 // 27.5.5, manipulators:
    168 ios_base& boolalpha (ios_base& str);
    169 ios_base& noboolalpha(ios_base& str);
    170 ios_base& showbase (ios_base& str);
    171 ios_base& noshowbase (ios_base& str);
    172 ios_base& showpoint (ios_base& str);
    173 ios_base& noshowpoint(ios_base& str);
    174 ios_base& showpos (ios_base& str);
    175 ios_base& noshowpos (ios_base& str);
    176 ios_base& skipws (ios_base& str);
    177 ios_base& noskipws (ios_base& str);
    178 ios_base& uppercase (ios_base& str);
    179 ios_base& nouppercase(ios_base& str);
    180 ios_base& unitbuf (ios_base& str);
    181 ios_base& nounitbuf (ios_base& str);
    182 
    183 // 27.5.5.2 adjustfield:
    184 ios_base& internal (ios_base& str);
    185 ios_base& left (ios_base& str);
    186 ios_base& right (ios_base& str);
    187 
    188 // 27.5.5.3 basefield:
    189 ios_base& dec (ios_base& str);
    190 ios_base& hex (ios_base& str);
    191 ios_base& oct (ios_base& str);
    192 
    193 // 27.5.5.4 floatfield:
    194 ios_base& fixed (ios_base& str);
    195 ios_base& scientific (ios_base& str);
    196 ios_base& hexfloat (ios_base& str);
    197 ios_base& defaultfloat(ios_base& str);
    198 
    199 // 27.5.5.5 error reporting:
    200 enum class io_errc
    201 {
    202     stream = 1
    203 };
    204 
    205 concept_map ErrorCodeEnum<io_errc> { };
    206 error_code make_error_code(io_errc e) noexcept; 
    207 error_condition make_error_condition(io_errc e) noexcept; 
    208 storage-class-specifier const error_category& iostream_category() noexcept;
    209 
    210 }  // std
    211 
    212 */
    213 
    214 #include <__config>
    215 #include <iosfwd>
    216 #include <__locale>
    217 #include <system_error>
    218 
    219 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
    220 #include <atomic>     // for __xindex_
    221 #endif
    222 
    223 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
    224 #pragma GCC system_header
    225 #endif
    226 
    227 _LIBCPP_BEGIN_NAMESPACE_STD
    228 
    229 typedef ptrdiff_t streamsize;
    230 
    231 class _LIBCPP_TYPE_VIS ios_base
    232 {
    233 public:
    234     class _LIBCPP_EXCEPTION_ABI failure;
    235 
    236     typedef unsigned int fmtflags;
    237     static const fmtflags boolalpha   = 0x0001;
    238     static const fmtflags dec         = 0x0002;
    239     static const fmtflags fixed       = 0x0004;
    240     static const fmtflags hex         = 0x0008;
    241     static const fmtflags internal    = 0x0010;
    242     static const fmtflags left        = 0x0020;
    243     static const fmtflags oct         = 0x0040;
    244     static const fmtflags right       = 0x0080;
    245     static const fmtflags scientific  = 0x0100;
    246     static const fmtflags showbase    = 0x0200;
    247     static const fmtflags showpoint   = 0x0400;
    248     static const fmtflags showpos     = 0x0800;
    249     static const fmtflags skipws      = 0x1000;
    250     static const fmtflags unitbuf     = 0x2000;
    251     static const fmtflags uppercase   = 0x4000;
    252     static const fmtflags adjustfield = left | right | internal;
    253     static const fmtflags basefield   = dec | oct | hex;
    254     static const fmtflags floatfield  = scientific | fixed;
    255 
    256     typedef unsigned int iostate;
    257     static const iostate badbit  = 0x1;
    258     static const iostate eofbit  = 0x2;
    259     static const iostate failbit = 0x4;
    260     static const iostate goodbit = 0x0;
    261 
    262     typedef unsigned int openmode;
    263     static const openmode app    = 0x01;
    264     static const openmode ate    = 0x02;
    265     static const openmode binary = 0x04;
    266     static const openmode in     = 0x08;
    267     static const openmode out    = 0x10;
    268     static const openmode trunc  = 0x20;
    269 
    270     enum seekdir {beg, cur, end};
    271 
    272 #if _LIBCPP_STD_VER <= 14
    273     typedef iostate      io_state;
    274     typedef openmode     open_mode;
    275     typedef seekdir      seek_dir;
    276 
    277     typedef _VSTD::streamoff streamoff;
    278     typedef _VSTD::streampos streampos;
    279 #endif
    280 
    281     class _LIBCPP_TYPE_VIS Init;
    282 
    283     // 27.5.2.2 fmtflags state:
    284     _LIBCPP_INLINE_VISIBILITY fmtflags flags() const;
    285     _LIBCPP_INLINE_VISIBILITY fmtflags flags(fmtflags __fmtfl);
    286     _LIBCPP_INLINE_VISIBILITY fmtflags setf(fmtflags __fmtfl);
    287     _LIBCPP_INLINE_VISIBILITY fmtflags setf(fmtflags __fmtfl, fmtflags __mask);
    288     _LIBCPP_INLINE_VISIBILITY void unsetf(fmtflags __mask);
    289 
    290     _LIBCPP_INLINE_VISIBILITY streamsize precision() const;
    291     _LIBCPP_INLINE_VISIBILITY streamsize precision(streamsize __prec);
    292     _LIBCPP_INLINE_VISIBILITY streamsize width() const;
    293     _LIBCPP_INLINE_VISIBILITY streamsize width(streamsize __wide);
    294 
    295     // 27.5.2.3 locales:
    296     locale imbue(const locale& __loc);
    297     locale getloc() const;
    298 
    299     // 27.5.2.5 storage:
    300     static int xalloc();
    301     long& iword(int __index);
    302     void*& pword(int __index);
    303 
    304     // destructor
    305     virtual ~ios_base();
    306 
    307     // 27.5.2.6 callbacks;
    308     enum event { erase_event, imbue_event, copyfmt_event };
    309     typedef void (*event_callback)(event, ios_base&, int __index);
    310     void register_callback(event_callback __fn, int __index);
    311 
    312 private:
    313     ios_base(const ios_base&); // = delete;
    314     ios_base& operator=(const ios_base&); // = delete;
    315 
    316 public:
    317     static bool sync_with_stdio(bool __sync = true);
    318 
    319     _LIBCPP_INLINE_VISIBILITY iostate rdstate() const;
    320     void clear(iostate __state = goodbit);
    321     _LIBCPP_INLINE_VISIBILITY void setstate(iostate __state);
    322 
    323     _LIBCPP_INLINE_VISIBILITY bool good() const;
    324     _LIBCPP_INLINE_VISIBILITY bool eof() const;
    325     _LIBCPP_INLINE_VISIBILITY bool fail() const;
    326     _LIBCPP_INLINE_VISIBILITY bool bad() const;
    327 
    328     _LIBCPP_INLINE_VISIBILITY iostate exceptions() const;
    329     _LIBCPP_INLINE_VISIBILITY void exceptions(iostate __iostate);
    330 
    331     void __set_badbit_and_consider_rethrow();
    332     void __set_failbit_and_consider_rethrow();
    333 
    334 protected:
    335     _LIBCPP_INLINE_VISIBILITY
    336     ios_base() {// purposefully does no initialization
    337                }
    338 
    339     void init(void* __sb);
    340     _LIBCPP_ALWAYS_INLINE void* rdbuf() const {return __rdbuf_;}
    341 
    342     _LIBCPP_ALWAYS_INLINE
    343     void rdbuf(void* __sb)
    344     {
    345         __rdbuf_ = __sb;
    346         clear();
    347     }
    348 
    349     void __call_callbacks(event);
    350     void copyfmt(const ios_base&);
    351     void move(ios_base&);
    352     void swap(ios_base&) _NOEXCEPT;
    353 
    354     _LIBCPP_ALWAYS_INLINE
    355     void set_rdbuf(void* __sb)
    356     {
    357         __rdbuf_ = __sb;
    358     }
    359 
    360 private:
    361     // All data members must be scalars
    362     fmtflags        __fmtflags_;
    363     streamsize      __precision_;
    364     streamsize      __width_;
    365     iostate         __rdstate_;
    366     iostate         __exceptions_;
    367     void*           __rdbuf_;
    368     void*           __loc_;
    369     event_callback* __fn_;
    370     int*            __index_;
    371     size_t          __event_size_;
    372     size_t          __event_cap_;
    373 // TODO(EricWF): Enable this for both Clang and GCC. Currently it is only
    374 // enabled with clang.
    375 #if defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_NO_THREADS)
    376     static atomic<int> __xindex_;
    377 #else
    378     static int      __xindex_;
    379 #endif
    380     long*           __iarray_;
    381     size_t          __iarray_size_;
    382     size_t          __iarray_cap_;
    383     void**          __parray_;
    384     size_t          __parray_size_;
    385     size_t          __parray_cap_;
    386 };
    387 
    388 //enum class io_errc
    389 _LIBCPP_DECLARE_STRONG_ENUM(io_errc)
    390 {
    391     stream = 1
    392 };
    393 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(io_errc)
    394 
    395 template <>
    396 struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<io_errc> : public true_type { };
    397 
    398 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
    399 template <>
    400 struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<io_errc::__lx> : public true_type { };
    401 #endif
    402 
    403 _LIBCPP_FUNC_VIS
    404 const error_category& iostream_category() _NOEXCEPT;
    405 
    406 inline _LIBCPP_INLINE_VISIBILITY
    407 error_code
    408 make_error_code(io_errc __e) _NOEXCEPT
    409 {
    410     return error_code(static_cast<int>(__e), iostream_category());
    411 }
    412 
    413 inline _LIBCPP_INLINE_VISIBILITY
    414 error_condition
    415 make_error_condition(io_errc __e) _NOEXCEPT
    416 {
    417     return error_condition(static_cast<int>(__e), iostream_category());
    418 }
    419 
    420 class _LIBCPP_EXCEPTION_ABI ios_base::failure
    421     : public system_error
    422 {
    423 public:
    424     explicit failure(const string& __msg, const error_code& __ec = io_errc::stream);
    425     explicit failure(const char* __msg, const error_code& __ec = io_errc::stream);
    426     virtual ~failure() throw();
    427 };
    428 
    429 class _LIBCPP_TYPE_VIS ios_base::Init
    430 {
    431 public:
    432     Init();
    433     ~Init();
    434 };
    435 
    436 // fmtflags
    437 
    438 inline _LIBCPP_INLINE_VISIBILITY
    439 ios_base::fmtflags
    440 ios_base::flags() const
    441 {
    442     return __fmtflags_;
    443 }
    444 
    445 inline _LIBCPP_INLINE_VISIBILITY
    446 ios_base::fmtflags
    447 ios_base::flags(fmtflags __fmtfl)
    448 {
    449     fmtflags __r = __fmtflags_;
    450     __fmtflags_ = __fmtfl;
    451     return __r;
    452 }
    453 
    454 inline _LIBCPP_INLINE_VISIBILITY
    455 ios_base::fmtflags
    456 ios_base::setf(fmtflags __fmtfl)
    457 {
    458     fmtflags __r = __fmtflags_;
    459     __fmtflags_ |= __fmtfl;
    460     return __r;
    461 }
    462 
    463 inline _LIBCPP_INLINE_VISIBILITY
    464 void
    465 ios_base::unsetf(fmtflags __mask)
    466 {
    467     __fmtflags_ &= ~__mask;
    468 }
    469 
    470 inline _LIBCPP_INLINE_VISIBILITY
    471 ios_base::fmtflags
    472 ios_base::setf(fmtflags __fmtfl, fmtflags __mask)
    473 {
    474     fmtflags __r = __fmtflags_;
    475     unsetf(__mask);
    476     __fmtflags_ |= __fmtfl & __mask;
    477     return __r;
    478 }
    479 
    480 // precision
    481 
    482 inline _LIBCPP_INLINE_VISIBILITY
    483 streamsize
    484 ios_base::precision() const
    485 {
    486     return __precision_;
    487 }
    488 
    489 inline _LIBCPP_INLINE_VISIBILITY
    490 streamsize
    491 ios_base::precision(streamsize __prec)
    492 {
    493     streamsize __r = __precision_;
    494     __precision_ = __prec;
    495     return __r;
    496 }
    497 
    498 // width
    499 
    500 inline _LIBCPP_INLINE_VISIBILITY
    501 streamsize
    502 ios_base::width() const
    503 {
    504     return __width_;
    505 }
    506 
    507 inline _LIBCPP_INLINE_VISIBILITY
    508 streamsize
    509 ios_base::width(streamsize __wide)
    510 {
    511     streamsize __r = __width_;
    512     __width_ = __wide;
    513     return __r;
    514 }
    515 
    516 // iostate
    517 
    518 inline _LIBCPP_INLINE_VISIBILITY
    519 ios_base::iostate
    520 ios_base::rdstate() const
    521 {
    522     return __rdstate_;
    523 }
    524 
    525 inline _LIBCPP_INLINE_VISIBILITY
    526 void
    527 ios_base::setstate(iostate __state)
    528 {
    529     clear(__rdstate_ | __state);
    530 }
    531 
    532 inline _LIBCPP_INLINE_VISIBILITY
    533 bool
    534 ios_base::good() const
    535 {
    536     return __rdstate_ == 0;
    537 }
    538 
    539 inline _LIBCPP_INLINE_VISIBILITY
    540 bool
    541 ios_base::eof() const
    542 {
    543     return (__rdstate_ & eofbit) != 0;
    544 }
    545 
    546 inline _LIBCPP_INLINE_VISIBILITY
    547 bool
    548 ios_base::fail() const
    549 {
    550     return (__rdstate_ & (failbit | badbit)) != 0;
    551 }
    552 
    553 inline _LIBCPP_INLINE_VISIBILITY
    554 bool
    555 ios_base::bad() const
    556 {
    557     return (__rdstate_ & badbit) != 0;
    558 }
    559 
    560 inline _LIBCPP_INLINE_VISIBILITY
    561 ios_base::iostate
    562 ios_base::exceptions() const
    563 {
    564     return __exceptions_;
    565 }
    566 
    567 inline _LIBCPP_INLINE_VISIBILITY
    568 void
    569 ios_base::exceptions(iostate __iostate)
    570 {
    571     __exceptions_ = __iostate;
    572     clear(__rdstate_);
    573 }
    574 
    575 template <class _CharT, class _Traits>
    576 class _LIBCPP_TYPE_VIS_ONLY basic_ios
    577     : public ios_base
    578 {
    579 public:
    580     // types:
    581     typedef _CharT char_type;
    582     typedef _Traits traits_type;
    583 
    584     typedef typename traits_type::int_type int_type;
    585     typedef typename traits_type::pos_type pos_type;
    586     typedef typename traits_type::off_type off_type;
    587 
    588     _LIBCPP_ALWAYS_INLINE
    589         _LIBCPP_EXPLICIT
    590         operator bool() const {return !fail();}
    591     _LIBCPP_ALWAYS_INLINE bool operator!() const    {return  fail();}
    592     _LIBCPP_ALWAYS_INLINE iostate rdstate() const   {return ios_base::rdstate();}
    593     _LIBCPP_ALWAYS_INLINE void clear(iostate __state = goodbit) {ios_base::clear(__state);}
    594     _LIBCPP_ALWAYS_INLINE void setstate(iostate __state) {ios_base::setstate(__state);}
    595     _LIBCPP_ALWAYS_INLINE bool good() const {return ios_base::good();}
    596     _LIBCPP_ALWAYS_INLINE bool eof() const  {return ios_base::eof();}
    597     _LIBCPP_ALWAYS_INLINE bool fail() const {return ios_base::fail();}
    598     _LIBCPP_ALWAYS_INLINE bool bad() const  {return ios_base::bad();}
    599 
    600     _LIBCPP_ALWAYS_INLINE iostate exceptions() const {return ios_base::exceptions();}
    601     _LIBCPP_ALWAYS_INLINE void exceptions(iostate __iostate) {ios_base::exceptions(__iostate);}
    602 
    603     // 27.5.4.1 Constructor/destructor:
    604     _LIBCPP_INLINE_VISIBILITY
    605     explicit basic_ios(basic_streambuf<char_type,traits_type>* __sb);
    606     virtual ~basic_ios();
    607 
    608     // 27.5.4.2 Members:
    609     _LIBCPP_INLINE_VISIBILITY 
    610     basic_ostream<char_type, traits_type>* tie() const;
    611     _LIBCPP_INLINE_VISIBILITY 
    612     basic_ostream<char_type, traits_type>* tie(basic_ostream<char_type, traits_type>* __tiestr);
    613 
    614     _LIBCPP_INLINE_VISIBILITY 
    615     basic_streambuf<char_type, traits_type>* rdbuf() const;
    616     _LIBCPP_INLINE_VISIBILITY 
    617     basic_streambuf<char_type, traits_type>* rdbuf(basic_streambuf<char_type, traits_type>* __sb);
    618 
    619     basic_ios& copyfmt(const basic_ios& __rhs);
    620 
    621     _LIBCPP_INLINE_VISIBILITY 
    622     char_type fill() const;
    623     _LIBCPP_INLINE_VISIBILITY 
    624     char_type fill(char_type __ch);
    625 
    626     _LIBCPP_INLINE_VISIBILITY 
    627     locale imbue(const locale& __loc);
    628 
    629     _LIBCPP_INLINE_VISIBILITY 
    630     char narrow(char_type __c, char __dfault) const;
    631     _LIBCPP_INLINE_VISIBILITY 
    632     char_type widen(char __c) const;
    633 
    634 protected:
    635     _LIBCPP_ALWAYS_INLINE
    636     basic_ios() {// purposefully does no initialization
    637                 }
    638     _LIBCPP_INLINE_VISIBILITY 
    639     void init(basic_streambuf<char_type, traits_type>* __sb);
    640 
    641     _LIBCPP_INLINE_VISIBILITY 
    642     void move(basic_ios& __rhs);
    643 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    644     _LIBCPP_ALWAYS_INLINE
    645     void move(basic_ios&& __rhs) {move(__rhs);}
    646 #endif
    647     _LIBCPP_INLINE_VISIBILITY 
    648     void swap(basic_ios& __rhs) _NOEXCEPT;
    649     _LIBCPP_INLINE_VISIBILITY 
    650     void set_rdbuf(basic_streambuf<char_type, traits_type>* __sb);
    651 private:
    652     basic_ostream<char_type, traits_type>* __tie_;
    653      mutable int_type __fill_;
    654 };
    655 
    656 template <class _CharT, class _Traits>
    657 inline _LIBCPP_INLINE_VISIBILITY
    658 basic_ios<_CharT, _Traits>::basic_ios(basic_streambuf<char_type,traits_type>* __sb)
    659 {
    660     init(__sb);
    661 }
    662 
    663 template <class _CharT, class _Traits>
    664 basic_ios<_CharT, _Traits>::~basic_ios()
    665 {
    666 }
    667 
    668 template <class _CharT, class _Traits>
    669 inline _LIBCPP_INLINE_VISIBILITY
    670 void
    671 basic_ios<_CharT, _Traits>::init(basic_streambuf<char_type, traits_type>* __sb)
    672 {
    673     ios_base::init(__sb);
    674     __tie_ = 0;
    675     __fill_ = traits_type::eof();
    676 }
    677 
    678 template <class _CharT, class _Traits>
    679 inline _LIBCPP_INLINE_VISIBILITY
    680 basic_ostream<_CharT, _Traits>*
    681 basic_ios<_CharT, _Traits>::tie() const
    682 {
    683     return __tie_;
    684 }
    685 
    686 template <class _CharT, class _Traits>
    687 inline _LIBCPP_INLINE_VISIBILITY
    688 basic_ostream<_CharT, _Traits>*
    689 basic_ios<_CharT, _Traits>::tie(basic_ostream<char_type, traits_type>* __tiestr)
    690 {
    691     basic_ostream<char_type, traits_type>* __r = __tie_;
    692     __tie_ = __tiestr;
    693     return __r;
    694 }
    695 
    696 template <class _CharT, class _Traits>
    697 inline _LIBCPP_INLINE_VISIBILITY
    698 basic_streambuf<_CharT, _Traits>*
    699 basic_ios<_CharT, _Traits>::rdbuf() const
    700 {
    701     return static_cast<basic_streambuf<char_type, traits_type>*>(ios_base::rdbuf());
    702 }
    703 
    704 template <class _CharT, class _Traits>
    705 inline _LIBCPP_INLINE_VISIBILITY
    706 basic_streambuf<_CharT, _Traits>*
    707 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<char_type, traits_type>* __sb)
    708 {
    709     basic_streambuf<char_type, traits_type>* __r = rdbuf();
    710     ios_base::rdbuf(__sb);
    711     return __r;
    712 }
    713 
    714 template <class _CharT, class _Traits>
    715 inline _LIBCPP_INLINE_VISIBILITY
    716 locale
    717 basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
    718 {
    719     locale __r = getloc();
    720     ios_base::imbue(__loc);
    721     if (rdbuf())
    722         rdbuf()->pubimbue(__loc);
    723     return __r;
    724 }
    725 
    726 template <class _CharT, class _Traits>
    727 inline _LIBCPP_INLINE_VISIBILITY
    728 char
    729 basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
    730 {
    731     return use_facet<ctype<char_type> >(getloc()).narrow(__c, __dfault);
    732 }
    733 
    734 template <class _CharT, class _Traits>
    735 inline _LIBCPP_INLINE_VISIBILITY
    736 _CharT
    737 basic_ios<_CharT, _Traits>::widen(char __c) const
    738 {
    739     return use_facet<ctype<char_type> >(getloc()).widen(__c);
    740 }
    741 
    742 template <class _CharT, class _Traits>
    743 inline _LIBCPP_INLINE_VISIBILITY
    744 _CharT
    745 basic_ios<_CharT, _Traits>::fill() const
    746 {
    747     if (traits_type::eq_int_type(traits_type::eof(), __fill_))
    748         __fill_ = widen(' ');
    749     return __fill_;
    750 }
    751 
    752 template <class _CharT, class _Traits>
    753 inline _LIBCPP_INLINE_VISIBILITY
    754 _CharT
    755 basic_ios<_CharT, _Traits>::fill(char_type __ch)
    756 {
    757     char_type __r = __fill_;
    758     __fill_ = __ch;
    759     return __r;
    760 }
    761 
    762 template <class _CharT, class _Traits>
    763 basic_ios<_CharT, _Traits>&
    764 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    765 {
    766     if (this != &__rhs)
    767     {
    768         __call_callbacks(erase_event);
    769         ios_base::copyfmt(__rhs);
    770         __tie_ = __rhs.__tie_;
    771         __fill_ = __rhs.__fill_;
    772         __call_callbacks(copyfmt_event);
    773         exceptions(__rhs.exceptions());
    774     }
    775     return *this;
    776 }
    777 
    778 template <class _CharT, class _Traits>
    779 inline _LIBCPP_INLINE_VISIBILITY
    780 void
    781 basic_ios<_CharT, _Traits>::move(basic_ios& __rhs)
    782 {
    783     ios_base::move(__rhs);
    784     __tie_ = __rhs.__tie_;
    785     __rhs.__tie_ = 0;
    786     __fill_ = __rhs.__fill_;
    787 }
    788 
    789 template <class _CharT, class _Traits>
    790 inline _LIBCPP_INLINE_VISIBILITY
    791 void
    792 basic_ios<_CharT, _Traits>::swap(basic_ios& __rhs) _NOEXCEPT
    793 {
    794     ios_base::swap(__rhs);
    795     _VSTD::swap(__tie_, __rhs.__tie_);
    796     _VSTD::swap(__fill_, __rhs.__fill_);
    797 }
    798 
    799 template <class _CharT, class _Traits>
    800 inline _LIBCPP_INLINE_VISIBILITY
    801 void
    802 basic_ios<_CharT, _Traits>::set_rdbuf(basic_streambuf<char_type, traits_type>* __sb)
    803 {
    804     ios_base::set_rdbuf(__sb);
    805 }
    806 
    807 inline _LIBCPP_INLINE_VISIBILITY
    808 ios_base&
    809 boolalpha(ios_base& __str)
    810 {
    811     __str.setf(ios_base::boolalpha);
    812     return __str;
    813 }
    814 
    815 inline _LIBCPP_INLINE_VISIBILITY
    816 ios_base&
    817 noboolalpha(ios_base& __str)
    818 {
    819     __str.unsetf(ios_base::boolalpha);
    820     return __str;
    821 }
    822 
    823 inline _LIBCPP_INLINE_VISIBILITY
    824 ios_base&
    825 showbase(ios_base& __str)
    826 {
    827     __str.setf(ios_base::showbase);
    828     return __str;
    829 }
    830 
    831 inline _LIBCPP_INLINE_VISIBILITY
    832 ios_base&
    833 noshowbase(ios_base& __str)
    834 {
    835     __str.unsetf(ios_base::showbase);
    836     return __str;
    837 }
    838 
    839 inline _LIBCPP_INLINE_VISIBILITY
    840 ios_base&
    841 showpoint(ios_base& __str)
    842 {
    843     __str.setf(ios_base::showpoint);
    844     return __str;
    845 }
    846 
    847 inline _LIBCPP_INLINE_VISIBILITY
    848 ios_base&
    849 noshowpoint(ios_base& __str)
    850 {
    851     __str.unsetf(ios_base::showpoint);
    852     return __str;
    853 }
    854 
    855 inline _LIBCPP_INLINE_VISIBILITY
    856 ios_base&
    857 showpos(ios_base& __str)
    858 {
    859     __str.setf(ios_base::showpos);
    860     return __str;
    861 }
    862 
    863 inline _LIBCPP_INLINE_VISIBILITY
    864 ios_base&
    865 noshowpos(ios_base& __str)
    866 {
    867     __str.unsetf(ios_base::showpos);
    868     return __str;
    869 }
    870 
    871 inline _LIBCPP_INLINE_VISIBILITY
    872 ios_base&
    873 skipws(ios_base& __str)
    874 {
    875     __str.setf(ios_base::skipws);
    876     return __str;
    877 }
    878 
    879 inline _LIBCPP_INLINE_VISIBILITY
    880 ios_base&
    881 noskipws(ios_base& __str)
    882 {
    883     __str.unsetf(ios_base::skipws);
    884     return __str;
    885 }
    886 
    887 inline _LIBCPP_INLINE_VISIBILITY
    888 ios_base&
    889 uppercase(ios_base& __str)
    890 {
    891     __str.setf(ios_base::uppercase);
    892     return __str;
    893 }
    894 
    895 inline _LIBCPP_INLINE_VISIBILITY
    896 ios_base&
    897 nouppercase(ios_base& __str)
    898 {
    899     __str.unsetf(ios_base::uppercase);
    900     return __str;
    901 }
    902 
    903 inline _LIBCPP_INLINE_VISIBILITY
    904 ios_base&
    905 unitbuf(ios_base& __str)
    906 {
    907     __str.setf(ios_base::unitbuf);
    908     return __str;
    909 }
    910 
    911 inline _LIBCPP_INLINE_VISIBILITY
    912 ios_base&
    913 nounitbuf(ios_base& __str)
    914 {
    915     __str.unsetf(ios_base::unitbuf);
    916     return __str;
    917 }
    918 
    919 inline _LIBCPP_INLINE_VISIBILITY
    920 ios_base&
    921 internal(ios_base& __str)
    922 {
    923     __str.setf(ios_base::internal, ios_base::adjustfield);
    924     return __str;
    925 }
    926 
    927 inline _LIBCPP_INLINE_VISIBILITY
    928 ios_base&
    929 left(ios_base& __str)
    930 {
    931     __str.setf(ios_base::left, ios_base::adjustfield);
    932     return __str;
    933 }
    934 
    935 inline _LIBCPP_INLINE_VISIBILITY
    936 ios_base&
    937 right(ios_base& __str)
    938 {
    939     __str.setf(ios_base::right, ios_base::adjustfield);
    940     return __str;
    941 }
    942 
    943 inline _LIBCPP_INLINE_VISIBILITY
    944 ios_base&
    945 dec(ios_base& __str)
    946 {
    947     __str.setf(ios_base::dec, ios_base::basefield);
    948     return __str;
    949 }
    950 
    951 inline _LIBCPP_INLINE_VISIBILITY
    952 ios_base&
    953 hex(ios_base& __str)
    954 {
    955     __str.setf(ios_base::hex, ios_base::basefield);
    956     return __str;
    957 }
    958 
    959 inline _LIBCPP_INLINE_VISIBILITY
    960 ios_base&
    961 oct(ios_base& __str)
    962 {
    963     __str.setf(ios_base::oct, ios_base::basefield);
    964     return __str;
    965 }
    966 
    967 inline _LIBCPP_INLINE_VISIBILITY
    968 ios_base&
    969 fixed(ios_base& __str)
    970 {
    971     __str.setf(ios_base::fixed, ios_base::floatfield);
    972     return __str;
    973 }
    974 
    975 inline _LIBCPP_INLINE_VISIBILITY
    976 ios_base&
    977 scientific(ios_base& __str)
    978 {
    979     __str.setf(ios_base::scientific, ios_base::floatfield);
    980     return __str;
    981 }
    982 
    983 inline _LIBCPP_INLINE_VISIBILITY
    984 ios_base&
    985 hexfloat(ios_base& __str)
    986 {
    987     __str.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield);
    988     return __str;
    989 }
    990 
    991 inline _LIBCPP_INLINE_VISIBILITY
    992 ios_base&
    993 defaultfloat(ios_base& __str)
    994 {
    995     __str.unsetf(ios_base::floatfield);
    996     return __str;
    997 }
    998 
    999 template <class _CharT, class _Traits>
   1000 class __save_flags
   1001 {
   1002     typedef basic_ios<_CharT, _Traits> __stream_type;
   1003     typedef typename __stream_type::fmtflags fmtflags;
   1004 
   1005     __stream_type& __stream_;
   1006     fmtflags       __fmtflags_;
   1007     _CharT         __fill_;
   1008 
   1009     __save_flags(const __save_flags&);
   1010     __save_flags& operator=(const __save_flags&);
   1011 public:
   1012     _LIBCPP_INLINE_VISIBILITY
   1013     explicit __save_flags(__stream_type& __stream)
   1014         : __stream_(__stream),
   1015           __fmtflags_(__stream.flags()),
   1016           __fill_(__stream.fill())
   1017         {}
   1018     _LIBCPP_INLINE_VISIBILITY
   1019     ~__save_flags()
   1020     {
   1021         __stream_.flags(__fmtflags_);
   1022         __stream_.fill(__fill_);
   1023     }
   1024 };
   1025 
   1026 _LIBCPP_END_NAMESPACE_STD
   1027 
   1028 #endif  // _LIBCPP_IOS
   1029