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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_TEMPLATE_VIS is_error_code_enum<io_errc> : public true_type { };
    397 
    398 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
    399 template <>
    400 struct _LIBCPP_TEMPLATE_VIS 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 #if defined(_LIBCPP_CXX03_LANG)
    576 struct _LIBCPP_TYPE_VIS __cxx03_bool {
    577   typedef void (__cxx03_bool::*__bool_type)();
    578   void __true_value() {}
    579 };
    580 #endif
    581 
    582 template <class _CharT, class _Traits>
    583 class _LIBCPP_TEMPLATE_VIS basic_ios
    584     : public ios_base
    585 {
    586 public:
    587     // types:
    588     typedef _CharT char_type;
    589     typedef _Traits traits_type;
    590 
    591     typedef typename traits_type::int_type int_type;
    592     typedef typename traits_type::pos_type pos_type;
    593     typedef typename traits_type::off_type off_type;
    594 
    595   // __true_value will generate undefined references when linking unless
    596   // we give it internal linkage.
    597 
    598 #if defined(_LIBCPP_CXX03_LANG)
    599     _LIBCPP_ALWAYS_INLINE
    600     operator __cxx03_bool::__bool_type() const {
    601         return !fail() ? &__cxx03_bool::__true_value : nullptr;
    602     }
    603 #else
    604     _LIBCPP_ALWAYS_INLINE
    605     _LIBCPP_EXPLICIT operator bool() const {return !fail();}
    606 #endif
    607 
    608     _LIBCPP_ALWAYS_INLINE bool operator!() const    {return  fail();}
    609     _LIBCPP_ALWAYS_INLINE iostate rdstate() const   {return ios_base::rdstate();}
    610     _LIBCPP_ALWAYS_INLINE void clear(iostate __state = goodbit) {ios_base::clear(__state);}
    611     _LIBCPP_ALWAYS_INLINE void setstate(iostate __state) {ios_base::setstate(__state);}
    612     _LIBCPP_ALWAYS_INLINE bool good() const {return ios_base::good();}
    613     _LIBCPP_ALWAYS_INLINE bool eof() const  {return ios_base::eof();}
    614     _LIBCPP_ALWAYS_INLINE bool fail() const {return ios_base::fail();}
    615     _LIBCPP_ALWAYS_INLINE bool bad() const  {return ios_base::bad();}
    616 
    617     _LIBCPP_ALWAYS_INLINE iostate exceptions() const {return ios_base::exceptions();}
    618     _LIBCPP_ALWAYS_INLINE void exceptions(iostate __iostate) {ios_base::exceptions(__iostate);}
    619 
    620     // 27.5.4.1 Constructor/destructor:
    621     _LIBCPP_INLINE_VISIBILITY
    622     explicit basic_ios(basic_streambuf<char_type,traits_type>* __sb);
    623     virtual ~basic_ios();
    624 
    625     // 27.5.4.2 Members:
    626     _LIBCPP_INLINE_VISIBILITY 
    627     basic_ostream<char_type, traits_type>* tie() const;
    628     _LIBCPP_INLINE_VISIBILITY 
    629     basic_ostream<char_type, traits_type>* tie(basic_ostream<char_type, traits_type>* __tiestr);
    630 
    631     _LIBCPP_INLINE_VISIBILITY 
    632     basic_streambuf<char_type, traits_type>* rdbuf() const;
    633     _LIBCPP_INLINE_VISIBILITY 
    634     basic_streambuf<char_type, traits_type>* rdbuf(basic_streambuf<char_type, traits_type>* __sb);
    635 
    636     basic_ios& copyfmt(const basic_ios& __rhs);
    637 
    638     _LIBCPP_INLINE_VISIBILITY 
    639     char_type fill() const;
    640     _LIBCPP_INLINE_VISIBILITY 
    641     char_type fill(char_type __ch);
    642 
    643     _LIBCPP_INLINE_VISIBILITY 
    644     locale imbue(const locale& __loc);
    645 
    646     _LIBCPP_INLINE_VISIBILITY 
    647     char narrow(char_type __c, char __dfault) const;
    648     _LIBCPP_INLINE_VISIBILITY 
    649     char_type widen(char __c) const;
    650 
    651 protected:
    652     _LIBCPP_ALWAYS_INLINE
    653     basic_ios() {// purposefully does no initialization
    654                 }
    655     _LIBCPP_INLINE_VISIBILITY 
    656     void init(basic_streambuf<char_type, traits_type>* __sb);
    657 
    658     _LIBCPP_INLINE_VISIBILITY 
    659     void move(basic_ios& __rhs);
    660 #ifndef _LIBCPP_CXX03_LANG
    661     _LIBCPP_ALWAYS_INLINE
    662     void move(basic_ios&& __rhs) {move(__rhs);}
    663 #endif
    664     _LIBCPP_INLINE_VISIBILITY 
    665     void swap(basic_ios& __rhs) _NOEXCEPT;
    666     _LIBCPP_INLINE_VISIBILITY 
    667     void set_rdbuf(basic_streambuf<char_type, traits_type>* __sb);
    668 private:
    669     basic_ostream<char_type, traits_type>* __tie_;
    670      mutable int_type __fill_;
    671 };
    672 
    673 template <class _CharT, class _Traits>
    674 inline _LIBCPP_INLINE_VISIBILITY
    675 basic_ios<_CharT, _Traits>::basic_ios(basic_streambuf<char_type,traits_type>* __sb)
    676 {
    677     init(__sb);
    678 }
    679 
    680 template <class _CharT, class _Traits>
    681 basic_ios<_CharT, _Traits>::~basic_ios()
    682 {
    683 }
    684 
    685 template <class _CharT, class _Traits>
    686 inline _LIBCPP_INLINE_VISIBILITY
    687 void
    688 basic_ios<_CharT, _Traits>::init(basic_streambuf<char_type, traits_type>* __sb)
    689 {
    690     ios_base::init(__sb);
    691     __tie_ = 0;
    692     __fill_ = traits_type::eof();
    693 }
    694 
    695 template <class _CharT, class _Traits>
    696 inline _LIBCPP_INLINE_VISIBILITY
    697 basic_ostream<_CharT, _Traits>*
    698 basic_ios<_CharT, _Traits>::tie() const
    699 {
    700     return __tie_;
    701 }
    702 
    703 template <class _CharT, class _Traits>
    704 inline _LIBCPP_INLINE_VISIBILITY
    705 basic_ostream<_CharT, _Traits>*
    706 basic_ios<_CharT, _Traits>::tie(basic_ostream<char_type, traits_type>* __tiestr)
    707 {
    708     basic_ostream<char_type, traits_type>* __r = __tie_;
    709     __tie_ = __tiestr;
    710     return __r;
    711 }
    712 
    713 template <class _CharT, class _Traits>
    714 inline _LIBCPP_INLINE_VISIBILITY
    715 basic_streambuf<_CharT, _Traits>*
    716 basic_ios<_CharT, _Traits>::rdbuf() const
    717 {
    718     return static_cast<basic_streambuf<char_type, traits_type>*>(ios_base::rdbuf());
    719 }
    720 
    721 template <class _CharT, class _Traits>
    722 inline _LIBCPP_INLINE_VISIBILITY
    723 basic_streambuf<_CharT, _Traits>*
    724 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<char_type, traits_type>* __sb)
    725 {
    726     basic_streambuf<char_type, traits_type>* __r = rdbuf();
    727     ios_base::rdbuf(__sb);
    728     return __r;
    729 }
    730 
    731 template <class _CharT, class _Traits>
    732 inline _LIBCPP_INLINE_VISIBILITY
    733 locale
    734 basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
    735 {
    736     locale __r = getloc();
    737     ios_base::imbue(__loc);
    738     if (rdbuf())
    739         rdbuf()->pubimbue(__loc);
    740     return __r;
    741 }
    742 
    743 template <class _CharT, class _Traits>
    744 inline _LIBCPP_INLINE_VISIBILITY
    745 char
    746 basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
    747 {
    748     return use_facet<ctype<char_type> >(getloc()).narrow(__c, __dfault);
    749 }
    750 
    751 template <class _CharT, class _Traits>
    752 inline _LIBCPP_INLINE_VISIBILITY
    753 _CharT
    754 basic_ios<_CharT, _Traits>::widen(char __c) const
    755 {
    756     return use_facet<ctype<char_type> >(getloc()).widen(__c);
    757 }
    758 
    759 template <class _CharT, class _Traits>
    760 inline _LIBCPP_INLINE_VISIBILITY
    761 _CharT
    762 basic_ios<_CharT, _Traits>::fill() const
    763 {
    764     if (traits_type::eq_int_type(traits_type::eof(), __fill_))
    765         __fill_ = widen(' ');
    766     return __fill_;
    767 }
    768 
    769 template <class _CharT, class _Traits>
    770 inline _LIBCPP_INLINE_VISIBILITY
    771 _CharT
    772 basic_ios<_CharT, _Traits>::fill(char_type __ch)
    773 {
    774     char_type __r = __fill_;
    775     __fill_ = __ch;
    776     return __r;
    777 }
    778 
    779 template <class _CharT, class _Traits>
    780 basic_ios<_CharT, _Traits>&
    781 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    782 {
    783     if (this != &__rhs)
    784     {
    785         __call_callbacks(erase_event);
    786         ios_base::copyfmt(__rhs);
    787         __tie_ = __rhs.__tie_;
    788         __fill_ = __rhs.__fill_;
    789         __call_callbacks(copyfmt_event);
    790         exceptions(__rhs.exceptions());
    791     }
    792     return *this;
    793 }
    794 
    795 template <class _CharT, class _Traits>
    796 inline _LIBCPP_INLINE_VISIBILITY
    797 void
    798 basic_ios<_CharT, _Traits>::move(basic_ios& __rhs)
    799 {
    800     ios_base::move(__rhs);
    801     __tie_ = __rhs.__tie_;
    802     __rhs.__tie_ = 0;
    803     __fill_ = __rhs.__fill_;
    804 }
    805 
    806 template <class _CharT, class _Traits>
    807 inline _LIBCPP_INLINE_VISIBILITY
    808 void
    809 basic_ios<_CharT, _Traits>::swap(basic_ios& __rhs) _NOEXCEPT
    810 {
    811     ios_base::swap(__rhs);
    812     _VSTD::swap(__tie_, __rhs.__tie_);
    813     _VSTD::swap(__fill_, __rhs.__fill_);
    814 }
    815 
    816 template <class _CharT, class _Traits>
    817 inline _LIBCPP_INLINE_VISIBILITY
    818 void
    819 basic_ios<_CharT, _Traits>::set_rdbuf(basic_streambuf<char_type, traits_type>* __sb)
    820 {
    821     ios_base::set_rdbuf(__sb);
    822 }
    823 
    824 inline _LIBCPP_INLINE_VISIBILITY
    825 ios_base&
    826 boolalpha(ios_base& __str)
    827 {
    828     __str.setf(ios_base::boolalpha);
    829     return __str;
    830 }
    831 
    832 inline _LIBCPP_INLINE_VISIBILITY
    833 ios_base&
    834 noboolalpha(ios_base& __str)
    835 {
    836     __str.unsetf(ios_base::boolalpha);
    837     return __str;
    838 }
    839 
    840 inline _LIBCPP_INLINE_VISIBILITY
    841 ios_base&
    842 showbase(ios_base& __str)
    843 {
    844     __str.setf(ios_base::showbase);
    845     return __str;
    846 }
    847 
    848 inline _LIBCPP_INLINE_VISIBILITY
    849 ios_base&
    850 noshowbase(ios_base& __str)
    851 {
    852     __str.unsetf(ios_base::showbase);
    853     return __str;
    854 }
    855 
    856 inline _LIBCPP_INLINE_VISIBILITY
    857 ios_base&
    858 showpoint(ios_base& __str)
    859 {
    860     __str.setf(ios_base::showpoint);
    861     return __str;
    862 }
    863 
    864 inline _LIBCPP_INLINE_VISIBILITY
    865 ios_base&
    866 noshowpoint(ios_base& __str)
    867 {
    868     __str.unsetf(ios_base::showpoint);
    869     return __str;
    870 }
    871 
    872 inline _LIBCPP_INLINE_VISIBILITY
    873 ios_base&
    874 showpos(ios_base& __str)
    875 {
    876     __str.setf(ios_base::showpos);
    877     return __str;
    878 }
    879 
    880 inline _LIBCPP_INLINE_VISIBILITY
    881 ios_base&
    882 noshowpos(ios_base& __str)
    883 {
    884     __str.unsetf(ios_base::showpos);
    885     return __str;
    886 }
    887 
    888 inline _LIBCPP_INLINE_VISIBILITY
    889 ios_base&
    890 skipws(ios_base& __str)
    891 {
    892     __str.setf(ios_base::skipws);
    893     return __str;
    894 }
    895 
    896 inline _LIBCPP_INLINE_VISIBILITY
    897 ios_base&
    898 noskipws(ios_base& __str)
    899 {
    900     __str.unsetf(ios_base::skipws);
    901     return __str;
    902 }
    903 
    904 inline _LIBCPP_INLINE_VISIBILITY
    905 ios_base&
    906 uppercase(ios_base& __str)
    907 {
    908     __str.setf(ios_base::uppercase);
    909     return __str;
    910 }
    911 
    912 inline _LIBCPP_INLINE_VISIBILITY
    913 ios_base&
    914 nouppercase(ios_base& __str)
    915 {
    916     __str.unsetf(ios_base::uppercase);
    917     return __str;
    918 }
    919 
    920 inline _LIBCPP_INLINE_VISIBILITY
    921 ios_base&
    922 unitbuf(ios_base& __str)
    923 {
    924     __str.setf(ios_base::unitbuf);
    925     return __str;
    926 }
    927 
    928 inline _LIBCPP_INLINE_VISIBILITY
    929 ios_base&
    930 nounitbuf(ios_base& __str)
    931 {
    932     __str.unsetf(ios_base::unitbuf);
    933     return __str;
    934 }
    935 
    936 inline _LIBCPP_INLINE_VISIBILITY
    937 ios_base&
    938 internal(ios_base& __str)
    939 {
    940     __str.setf(ios_base::internal, ios_base::adjustfield);
    941     return __str;
    942 }
    943 
    944 inline _LIBCPP_INLINE_VISIBILITY
    945 ios_base&
    946 left(ios_base& __str)
    947 {
    948     __str.setf(ios_base::left, ios_base::adjustfield);
    949     return __str;
    950 }
    951 
    952 inline _LIBCPP_INLINE_VISIBILITY
    953 ios_base&
    954 right(ios_base& __str)
    955 {
    956     __str.setf(ios_base::right, ios_base::adjustfield);
    957     return __str;
    958 }
    959 
    960 inline _LIBCPP_INLINE_VISIBILITY
    961 ios_base&
    962 dec(ios_base& __str)
    963 {
    964     __str.setf(ios_base::dec, ios_base::basefield);
    965     return __str;
    966 }
    967 
    968 inline _LIBCPP_INLINE_VISIBILITY
    969 ios_base&
    970 hex(ios_base& __str)
    971 {
    972     __str.setf(ios_base::hex, ios_base::basefield);
    973     return __str;
    974 }
    975 
    976 inline _LIBCPP_INLINE_VISIBILITY
    977 ios_base&
    978 oct(ios_base& __str)
    979 {
    980     __str.setf(ios_base::oct, ios_base::basefield);
    981     return __str;
    982 }
    983 
    984 inline _LIBCPP_INLINE_VISIBILITY
    985 ios_base&
    986 fixed(ios_base& __str)
    987 {
    988     __str.setf(ios_base::fixed, ios_base::floatfield);
    989     return __str;
    990 }
    991 
    992 inline _LIBCPP_INLINE_VISIBILITY
    993 ios_base&
    994 scientific(ios_base& __str)
    995 {
    996     __str.setf(ios_base::scientific, ios_base::floatfield);
    997     return __str;
    998 }
    999 
   1000 inline _LIBCPP_INLINE_VISIBILITY
   1001 ios_base&
   1002 hexfloat(ios_base& __str)
   1003 {
   1004     __str.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield);
   1005     return __str;
   1006 }
   1007 
   1008 inline _LIBCPP_INLINE_VISIBILITY
   1009 ios_base&
   1010 defaultfloat(ios_base& __str)
   1011 {
   1012     __str.unsetf(ios_base::floatfield);
   1013     return __str;
   1014 }
   1015 
   1016 template <class _CharT, class _Traits>
   1017 class __save_flags
   1018 {
   1019     typedef basic_ios<_CharT, _Traits> __stream_type;
   1020     typedef typename __stream_type::fmtflags fmtflags;
   1021 
   1022     __stream_type& __stream_;
   1023     fmtflags       __fmtflags_;
   1024     _CharT         __fill_;
   1025 
   1026     __save_flags(const __save_flags&);
   1027     __save_flags& operator=(const __save_flags&);
   1028 public:
   1029     _LIBCPP_INLINE_VISIBILITY
   1030     explicit __save_flags(__stream_type& __stream)
   1031         : __stream_(__stream),
   1032           __fmtflags_(__stream.flags()),
   1033           __fill_(__stream.fill())
   1034         {}
   1035     _LIBCPP_INLINE_VISIBILITY
   1036     ~__save_flags()
   1037     {
   1038         __stream_.flags(__fmtflags_);
   1039         __stream_.fill(__fill_);
   1040     }
   1041 };
   1042 
   1043 _LIBCPP_END_NAMESPACE_STD
   1044 
   1045 #endif  // _LIBCPP_IOS
   1046