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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
// -*- C++ -*-
//===---------------------------- ios -------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_IOS
#define _LIBCPP_IOS

/*
    ios synopsis

#include <iosfwd>

namespace std
{

typedef OFF_T streamoff;
typedef SZ_T streamsize;
template <class stateT> class fpos;

class ios_base
{
public:
    class failure;

    typedef T1 fmtflags;
    static constexpr fmtflags boolalpha;
    static constexpr fmtflags dec;
    static constexpr fmtflags fixed;
    static constexpr fmtflags hex;
    static constexpr fmtflags internal;
    static constexpr fmtflags left;
    static constexpr fmtflags oct;
    static constexpr fmtflags right;
    static constexpr fmtflags scientific;
    static constexpr fmtflags showbase;
    static constexpr fmtflags showpoint;
    static constexpr fmtflags showpos;
    static constexpr fmtflags skipws;
    static constexpr fmtflags unitbuf;
    static constexpr fmtflags uppercase;
    static constexpr fmtflags adjustfield;
    static constexpr fmtflags basefield;
    static constexpr fmtflags floatfield;

    typedef T2 iostate;
    static constexpr iostate badbit;
    static constexpr iostate eofbit;
    static constexpr iostate failbit;
    static constexpr iostate goodbit;

    typedef T3 openmode;
    static constexpr openmode app;
    static constexpr openmode ate;
    static constexpr openmode binary;
    static constexpr openmode in;
    static constexpr openmode out;
    static constexpr openmode trunc;

    typedef T4 seekdir;
    static constexpr seekdir beg;
    static constexpr seekdir cur;
    static constexpr seekdir end;

    class Init;

    // 27.5.2.2 fmtflags state:
    fmtflags flags() const;
    fmtflags flags(fmtflags fmtfl);
    fmtflags setf(fmtflags fmtfl);
    fmtflags setf(fmtflags fmtfl, fmtflags mask);
    void unsetf(fmtflags mask);

    streamsize precision() const;
    streamsize precision(streamsize prec);
    streamsize width() const;
    streamsize width(streamsize wide);

    // 27.5.2.3 locales:
    locale imbue(const locale& loc);
    locale getloc() const;

    // 27.5.2.5 storage:
    static int xalloc();
    long& iword(int index);
    void*& pword(int index);

    // destructor
    virtual ~ios_base();

    // 27.5.2.6 callbacks;
    enum event { erase_event, imbue_event, copyfmt_event };
    typedef void (*event_callback)(event, ios_base&, int index);
    void register_callback(event_callback fn, int index);

    ios_base(const ios_base&) = delete;
    ios_base& operator=(const ios_base&) = delete;

    static bool sync_with_stdio(bool sync = true);

protected:
    ios_base();
};

template <class charT, class traits = char_traits<charT> >
class basic_ios
    : public ios_base
{
public:
    // types:
    typedef charT char_type;
    typedef typename traits::int_type int_type;  // removed in C++17
    typedef typename traits::pos_type pos_type;  // removed in C++17
    typedef typename traits::off_type off_type;  // removed in C++17
    typedef traits traits_type;

    operator unspecified-bool-type() const;
    bool operator!() const;
    iostate rdstate() const;
    void clear(iostate state = goodbit);
    void setstate(iostate state);
    bool good() const;
    bool eof() const;
    bool fail() const;
    bool bad() const;

    iostate exceptions() const;
    void exceptions(iostate except);

    // 27.5.4.1 Constructor/destructor:
    explicit basic_ios(basic_streambuf<charT,traits>* sb);
    virtual ~basic_ios();

    // 27.5.4.2 Members:
    basic_ostream<charT,traits>* tie() const;
    basic_ostream<charT,traits>* tie(basic_ostream<charT,traits>* tiestr);

    basic_streambuf<charT,traits>* rdbuf() const;
    basic_streambuf<charT,traits>* rdbuf(basic_streambuf<charT,traits>* sb);

    basic_ios& copyfmt(const basic_ios& rhs);

    char_type fill() const;
    char_type fill(char_type ch);

    locale imbue(const locale& loc);

    char narrow(char_type c, char dfault) const;
    char_type widen(char c) const;

    basic_ios(const basic_ios& ) = delete;
    basic_ios& operator=(const basic_ios&) = delete;

protected:
    basic_ios();
    void init(basic_streambuf<charT,traits>* sb);
    void move(basic_ios& rhs);
    void swap(basic_ios& rhs) noexcept;
    void set_rdbuf(basic_streambuf<charT, traits>* sb);
};

// 27.5.5, manipulators:
ios_base& boolalpha (ios_base& str);
ios_base& noboolalpha(ios_base& str);
ios_base& showbase (ios_base& str);
ios_base& noshowbase (ios_base& str);
ios_base& showpoint (ios_base& str);
ios_base& noshowpoint(ios_base& str);
ios_base& showpos (ios_base& str);
ios_base& noshowpos (ios_base& str);
ios_base& skipws (ios_base& str);
ios_base& noskipws (ios_base& str);
ios_base& uppercase (ios_base& str);
ios_base& nouppercase(ios_base& str);
ios_base& unitbuf (ios_base& str);
ios_base& nounitbuf (ios_base& str);

// 27.5.5.2 adjustfield:
ios_base& internal (ios_base& str);
ios_base& left (ios_base& str);
ios_base& right (ios_base& str);

// 27.5.5.3 basefield:
ios_base& dec (ios_base& str);
ios_base& hex (ios_base& str);
ios_base& oct (ios_base& str);

// 27.5.5.4 floatfield:
ios_base& fixed (ios_base& str);
ios_base& scientific (ios_base& str);
ios_base& hexfloat (ios_base& str);
ios_base& defaultfloat(ios_base& str);

// 27.5.5.5 error reporting:
enum class io_errc
{
    stream = 1
};

concept_map ErrorCodeEnum<io_errc> { };
error_code make_error_code(io_errc e) noexcept;
error_condition make_error_condition(io_errc e) noexcept;
storage-class-specifier const error_category& iostream_category() noexcept;

}  // std

*/

#include <__config>
#include <iosfwd>
#include <__locale>
#include <system_error>

#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
#include <atomic>     // for __xindex_
#endif

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

_LIBCPP_BEGIN_NAMESPACE_STD

typedef ptrdiff_t streamsize;

class _LIBCPP_TYPE_VIS ios_base
{
public:
    class _LIBCPP_EXCEPTION_ABI failure;

    typedef unsigned int fmtflags;
    static const fmtflags boolalpha   = 0x0001;
    static const fmtflags dec         = 0x0002;
    static const fmtflags fixed       = 0x0004;
    static const fmtflags hex         = 0x0008;
    static const fmtflags internal    = 0x0010;
    static const fmtflags left        = 0x0020;
    static const fmtflags oct         = 0x0040;
    static const fmtflags right       = 0x0080;
    static const fmtflags scientific  = 0x0100;
    static const fmtflags showbase    = 0x0200;
    static const fmtflags showpoint   = 0x0400;
    static const fmtflags showpos     = 0x0800;
    static const fmtflags skipws      = 0x1000;
    static const fmtflags unitbuf     = 0x2000;
    static const fmtflags uppercase   = 0x4000;
    static const fmtflags adjustfield = left | right | internal;
    static const fmtflags basefield   = dec | oct | hex;
    static const fmtflags floatfield  = scientific | fixed;

    typedef unsigned int iostate;
    static const iostate badbit  = 0x1;
    static const iostate eofbit  = 0x2;
    static const iostate failbit = 0x4;
    static const iostate goodbit = 0x0;

    typedef unsigned int openmode;
    static const openmode app    = 0x01;
    static const openmode ate    = 0x02;
    static const openmode binary = 0x04;
    static const openmode in     = 0x08;
    static const openmode out    = 0x10;
    static const openmode trunc  = 0x20;

    enum seekdir {beg, cur, end};

#if _LIBCPP_STD_VER <= 14
    typedef iostate      io_state;
    typedef openmode     open_mode;
    typedef seekdir      seek_dir;

    typedef _VSTD::streamoff streamoff;
    typedef _VSTD::streampos streampos;
#endif

    class _LIBCPP_TYPE_VIS Init;

    // 27.5.2.2 fmtflags state:
    _LIBCPP_INLINE_VISIBILITY fmtflags flags() const;
    _LIBCPP_INLINE_VISIBILITY fmtflags flags(fmtflags __fmtfl);
    _LIBCPP_INLINE_VISIBILITY fmtflags setf(fmtflags __fmtfl);
    _LIBCPP_INLINE_VISIBILITY fmtflags setf(fmtflags __fmtfl, fmtflags __mask);
    _LIBCPP_INLINE_VISIBILITY void unsetf(fmtflags __mask);

    _LIBCPP_INLINE_VISIBILITY streamsize precision() const;
    _LIBCPP_INLINE_VISIBILITY streamsize precision(streamsize __prec);
    _LIBCPP_INLINE_VISIBILITY streamsize width() const;
    _LIBCPP_INLINE_VISIBILITY streamsize width(streamsize __wide);

    // 27.5.2.3 locales:
    locale imbue(const locale& __loc);
    locale getloc() const;

    // 27.5.2.5 storage:
    static int xalloc();
    long& iword(int __index);
    void*& pword(int __index);

    // destructor
    virtual ~ios_base();

    // 27.5.2.6 callbacks;
    enum event { erase_event, imbue_event, copyfmt_event };
    typedef void (*event_callback)(event, ios_base&, int __index);
    void register_callback(event_callback __fn, int __index);

private:
    ios_base(const ios_base&); // = delete;
    ios_base& operator=(const ios_base&); // = delete;

public:
    static bool sync_with_stdio(bool __sync = true);

    _LIBCPP_INLINE_VISIBILITY iostate rdstate() const;
    void clear(iostate __state = goodbit);
    _LIBCPP_INLINE_VISIBILITY void setstate(iostate __state);

    _LIBCPP_INLINE_VISIBILITY bool good() const;
    _LIBCPP_INLINE_VISIBILITY bool eof() const;
    _LIBCPP_INLINE_VISIBILITY bool fail() const;
    _LIBCPP_INLINE_VISIBILITY bool bad() const;

    _LIBCPP_INLINE_VISIBILITY iostate exceptions() const;
    _LIBCPP_INLINE_VISIBILITY void exceptions(iostate __iostate);

    void __set_badbit_and_consider_rethrow();
    void __set_failbit_and_consider_rethrow();

    _LIBCPP_INLINE_VISIBILITY
    void __setstate_nothrow(iostate __state)
    {
        if (__rdbuf_)
            __rdstate_ |= __state;
        else
            __rdstate_ |= __state | ios_base::badbit;
    }

protected:
    _LIBCPP_INLINE_VISIBILITY
    ios_base() {// purposefully does no initialization
               }

    void init(void* __sb);
    _LIBCPP_INLINE_VISIBILITY void* rdbuf() const {return __rdbuf_;}

    _LIBCPP_INLINE_VISIBILITY
    void rdbuf(void* __sb)
    {
        __rdbuf_ = __sb;
        clear();
    }

    void __call_callbacks(event);
    void copyfmt(const ios_base&);
    void move(ios_base&);
    void swap(ios_base&) _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    void set_rdbuf(void* __sb)
    {
        __rdbuf_ = __sb;
    }

private:
    // All data members must be scalars
    fmtflags        __fmtflags_;
    streamsize      __precision_;
    streamsize      __width_;
    iostate         __rdstate_;
    iostate         __exceptions_;
    void*           __rdbuf_;
    void*           __loc_;
    event_callback* __fn_;
    int*            __index_;
    size_t          __event_size_;
    size_t          __event_cap_;
// TODO(EricWF): Enable this for both Clang and GCC. Currently it is only
// enabled with clang.
#if defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_NO_THREADS)
    static atomic<int> __xindex_;
#else
    static int      __xindex_;
#endif
    long*           __iarray_;
    size_t          __iarray_size_;
    size_t          __iarray_cap_;
    void**          __parray_;
    size_t          __parray_size_;
    size_t          __parray_cap_;
};

//enum class io_errc
_LIBCPP_DECLARE_STRONG_ENUM(io_errc)
{
    stream = 1
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(io_errc)

template <>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<io_errc> : public true_type { };

#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
template <>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<io_errc::__lx> : public true_type { };
#endif

_LIBCPP_FUNC_VIS
const error_category& iostream_category() _NOEXCEPT;

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

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

class _LIBCPP_EXCEPTION_ABI ios_base::failure
    : public system_error
{
public:
    explicit failure(const string& __msg, const error_code& __ec = io_errc::stream);
    explicit failure(const char* __msg, const error_code& __ec = io_errc::stream);
    failure(const failure&) _NOEXCEPT = default;
    virtual ~failure() _NOEXCEPT;
};

_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
void __throw_failure(char const* __msg) {
#ifndef _LIBCPP_NO_EXCEPTIONS
    throw ios_base::failure(__msg);
#else
    ((void)__msg);
    _VSTD::abort();
#endif
}

class _LIBCPP_TYPE_VIS ios_base::Init
{
public:
    Init();
    ~Init();
};

// fmtflags

inline _LIBCPP_INLINE_VISIBILITY
ios_base::fmtflags
ios_base::flags() const
{
    return __fmtflags_;
}

inline _LIBCPP_INLINE_VISIBILITY
ios_base::fmtflags
ios_base::flags(fmtflags __fmtfl)
{
    fmtflags __r = __fmtflags_;
    __fmtflags_ = __fmtfl;
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
ios_base::fmtflags
ios_base::setf(fmtflags __fmtfl)
{
    fmtflags __r = __fmtflags_;
    __fmtflags_ |= __fmtfl;
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
void
ios_base::unsetf(fmtflags __mask)
{
    __fmtflags_ &= ~__mask;
}

inline _LIBCPP_INLINE_VISIBILITY
ios_base::fmtflags
ios_base::setf(fmtflags __fmtfl, fmtflags __mask)
{
    fmtflags __r = __fmtflags_;
    unsetf(__mask);
    __fmtflags_ |= __fmtfl & __mask;
    return __r;
}

// precision

inline _LIBCPP_INLINE_VISIBILITY
streamsize
ios_base::precision() const
{
    return __precision_;
}

inline _LIBCPP_INLINE_VISIBILITY
streamsize
ios_base::precision(streamsize __prec)
{
    streamsize __r = __precision_;
    __precision_ = __prec;
    return __r;
}

// width

inline _LIBCPP_INLINE_VISIBILITY
streamsize
ios_base::width() const
{
    return __width_;
}

inline _LIBCPP_INLINE_VISIBILITY
streamsize
ios_base::width(streamsize __wide)
{
    streamsize __r = __width_;
    __width_ = __wide;
    return __r;
}

// iostate

inline _LIBCPP_INLINE_VISIBILITY
ios_base::iostate
ios_base::rdstate() const
{
    return __rdstate_;
}

inline _LIBCPP_INLINE_VISIBILITY
void
ios_base::setstate(iostate __state)
{
    clear(__rdstate_ | __state);
}

inline _LIBCPP_INLINE_VISIBILITY
bool
ios_base::good() const
{
    return __rdstate_ == 0;
}

inline _LIBCPP_INLINE_VISIBILITY
bool
ios_base::eof() const
{
    return (__rdstate_ & eofbit) != 0;
}

inline _LIBCPP_INLINE_VISIBILITY
bool
ios_base::fail() const
{
    return (__rdstate_ & (failbit | badbit)) != 0;
}

inline _LIBCPP_INLINE_VISIBILITY
bool
ios_base::bad() const
{
    return (__rdstate_ & badbit) != 0;
}

inline _LIBCPP_INLINE_VISIBILITY
ios_base::iostate
ios_base::exceptions() const
{
    return __exceptions_;
}

inline _LIBCPP_INLINE_VISIBILITY
void
ios_base::exceptions(iostate __iostate)
{
    __exceptions_ = __iostate;
    clear(__rdstate_);
}

#if defined(_LIBCPP_CXX03_LANG)
struct _LIBCPP_TYPE_VIS __cxx03_bool {
  typedef void (__cxx03_bool::*__bool_type)();
  void __true_value() {}
};
#endif

template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_ios
    : public ios_base
{
public:
    // types:
    typedef _CharT char_type;
    typedef _Traits traits_type;

    typedef typename traits_type::int_type int_type;
    typedef typename traits_type::pos_type pos_type;
    typedef typename traits_type::off_type off_type;

    static_assert((is_same<_CharT, typename traits_type::char_type>::value),
                  "traits_type::char_type must be the same type as CharT");

  // __true_value will generate undefined references when linking unless
  // we give it internal linkage.

#if defined(_LIBCPP_CXX03_LANG)
    _LIBCPP_INLINE_VISIBILITY
    operator __cxx03_bool::__bool_type() const {
        return !fail() ? &__cxx03_bool::__true_value : nullptr;
    }
#else
    _LIBCPP_INLINE_VISIBILITY
    _LIBCPP_EXPLICIT operator bool() const {return !fail();}
#endif

    _LIBCPP_INLINE_VISIBILITY bool operator!() const    {return  fail();}
    _LIBCPP_INLINE_VISIBILITY iostate rdstate() const   {return ios_base::rdstate();}
    _LIBCPP_INLINE_VISIBILITY void clear(iostate __state = goodbit) {ios_base::clear(__state);}
    _LIBCPP_INLINE_VISIBILITY void setstate(iostate __state) {ios_base::setstate(__state);}
    _LIBCPP_INLINE_VISIBILITY bool good() const {return ios_base::good();}
    _LIBCPP_INLINE_VISIBILITY bool eof() const  {return ios_base::eof();}
    _LIBCPP_INLINE_VISIBILITY bool fail() const {return ios_base::fail();}
    _LIBCPP_INLINE_VISIBILITY bool bad() const  {return ios_base::bad();}

    _LIBCPP_INLINE_VISIBILITY iostate exceptions() const {return ios_base::exceptions();}
    _LIBCPP_INLINE_VISIBILITY void exceptions(iostate __iostate) {ios_base::exceptions(__iostate);}

    // 27.5.4.1 Constructor/destructor:
    _LIBCPP_INLINE_VISIBILITY
    explicit basic_ios(basic_streambuf<char_type,traits_type>* __sb);
    virtual ~basic_ios();

    // 27.5.4.2 Members:
    _LIBCPP_INLINE_VISIBILITY
    basic_ostream<char_type, traits_type>* tie() const;
    _LIBCPP_INLINE_VISIBILITY
    basic_ostream<char_type, traits_type>* tie(basic_ostream<char_type, traits_type>* __tiestr);

    _LIBCPP_INLINE_VISIBILITY
    basic_streambuf<char_type, traits_type>* rdbuf() const;
    _LIBCPP_INLINE_VISIBILITY
    basic_streambuf<char_type, traits_type>* rdbuf(basic_streambuf<char_type, traits_type>* __sb);

    basic_ios& copyfmt(const basic_ios& __rhs);

    _LIBCPP_INLINE_VISIBILITY
    char_type fill() const;
    _LIBCPP_INLINE_VISIBILITY
    char_type fill(char_type __ch);

    _LIBCPP_INLINE_VISIBILITY
    locale imbue(const locale& __loc);

    _LIBCPP_INLINE_VISIBILITY
    char narrow(char_type __c, char __dfault) const;
    _LIBCPP_INLINE_VISIBILITY
    char_type widen(char __c) const;

protected:
    _LIBCPP_INLINE_VISIBILITY
    basic_ios() {// purposefully does no initialization
                }
    _LIBCPP_INLINE_VISIBILITY
    void init(basic_streambuf<char_type, traits_type>* __sb);

    _LIBCPP_INLINE_VISIBILITY
    void move(basic_ios& __rhs);
#ifndef _LIBCPP_CXX03_LANG
    _LIBCPP_INLINE_VISIBILITY
    void move(basic_ios&& __rhs) {move(__rhs);}
#endif
    _LIBCPP_INLINE_VISIBILITY
    void swap(basic_ios& __rhs) _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    void set_rdbuf(basic_streambuf<char_type, traits_type>* __sb);
private:
    basic_ostream<char_type, traits_type>* __tie_;
    mutable int_type __fill_;
};

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
basic_ios<_CharT, _Traits>::basic_ios(basic_streambuf<char_type,traits_type>* __sb)
{
    init(__sb);
}

template <class _CharT, class _Traits>
basic_ios<_CharT, _Traits>::~basic_ios()
{
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
basic_ios<_CharT, _Traits>::init(basic_streambuf<char_type, traits_type>* __sb)
{
    ios_base::init(__sb);
    __tie_ = 0;
    __fill_ = traits_type::eof();
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
basic_ostream<_CharT, _Traits>*
basic_ios<_CharT, _Traits>::tie() const
{
    return __tie_;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
basic_ostream<_CharT, _Traits>*
basic_ios<_CharT, _Traits>::tie(basic_ostream<char_type, traits_type>* __tiestr)
{
    basic_ostream<char_type, traits_type>* __r = __tie_;
    __tie_ = __tiestr;
    return __r;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
basic_streambuf<_CharT, _Traits>*
basic_ios<_CharT, _Traits>::rdbuf() const
{
    return static_cast<basic_streambuf<char_type, traits_type>*>(ios_base::rdbuf());
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
basic_streambuf<_CharT, _Traits>*
basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<char_type, traits_type>* __sb)
{
    basic_streambuf<char_type, traits_type>* __r = rdbuf();
    ios_base::rdbuf(__sb);
    return __r;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
locale
basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
{
    locale __r = getloc();
    ios_base::imbue(__loc);
    if (rdbuf())
        rdbuf()->pubimbue(__loc);
    return __r;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
char
basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
{
    return use_facet<ctype<char_type> >(getloc()).narrow(__c, __dfault);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
_CharT
basic_ios<_CharT, _Traits>::widen(char __c) const
{
    return use_facet<ctype<char_type> >(getloc()).widen(__c);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
_CharT
basic_ios<_CharT, _Traits>::fill() const
{
    if (traits_type::eq_int_type(traits_type::eof(), __fill_))
        __fill_ = widen(' ');
    return __fill_;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
_CharT
basic_ios<_CharT, _Traits>::fill(char_type __ch)
{
    char_type __r = __fill_;
    __fill_ = __ch;
    return __r;
}

template <class _CharT, class _Traits>
basic_ios<_CharT, _Traits>&
basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
{
    if (this != &__rhs)
    {
        __call_callbacks(erase_event);
        ios_base::copyfmt(__rhs);
        __tie_ = __rhs.__tie_;
        __fill_ = __rhs.__fill_;
        __call_callbacks(copyfmt_event);
        exceptions(__rhs.exceptions());
    }
    return *this;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
basic_ios<_CharT, _Traits>::move(basic_ios& __rhs)
{
    ios_base::move(__rhs);
    __tie_ = __rhs.__tie_;
    __rhs.__tie_ = 0;
    __fill_ = __rhs.__fill_;
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
basic_ios<_CharT, _Traits>::swap(basic_ios& __rhs) _NOEXCEPT
{
    ios_base::swap(__rhs);
    _VSTD::swap(__tie_, __rhs.__tie_);
    _VSTD::swap(__fill_, __rhs.__fill_);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
basic_ios<_CharT, _Traits>::set_rdbuf(basic_streambuf<char_type, traits_type>* __sb)
{
    ios_base::set_rdbuf(__sb);
}

inline
ios_base&
boolalpha(ios_base& __str)
{
    __str.setf(ios_base::boolalpha);
    return __str;
}

inline
ios_base&
noboolalpha(ios_base& __str)
{
    __str.unsetf(ios_base::boolalpha);
    return __str;
}

inline
ios_base&
showbase(ios_base& __str)
{
    __str.setf(ios_base::showbase);
    return __str;
}

inline
ios_base&
noshowbase(ios_base& __str)
{
    __str.unsetf(ios_base::showbase);
    return __str;
}

inline
ios_base&
showpoint(ios_base& __str)
{
    __str.setf(ios_base::showpoint);
    return __str;
}

inline
ios_base&
noshowpoint(ios_base& __str)
{
    __str.unsetf(ios_base::showpoint);
    return __str;
}

inline
ios_base&
showpos(ios_base& __str)
{
    __str.setf(ios_base::showpos);
    return __str;
}

inline
ios_base&
noshowpos(ios_base& __str)
{
    __str.unsetf(ios_base::showpos);
    return __str;
}

inline
ios_base&
skipws(ios_base& __str)
{
    __str.setf(ios_base::skipws);
    return __str;
}

inline
ios_base&
noskipws(ios_base& __str)
{
    __str.unsetf(ios_base::skipws);
    return __str;
}

inline
ios_base&
uppercase(ios_base& __str)
{
    __str.setf(ios_base::uppercase);
    return __str;
}

inline
ios_base&
nouppercase(ios_base& __str)
{
    __str.unsetf(ios_base::uppercase);
    return __str;
}

inline
ios_base&
unitbuf(ios_base& __str)
{
    __str.setf(ios_base::unitbuf);
    return __str;
}

inline
ios_base&
nounitbuf(ios_base& __str)
{
    __str.unsetf(ios_base::unitbuf);
    return __str;
}

inline
ios_base&
internal(ios_base& __str)
{
    __str.setf(ios_base::internal, ios_base::adjustfield);
    return __str;
}

inline
ios_base&
left(ios_base& __str)
{
    __str.setf(ios_base::left, ios_base::adjustfield);
    return __str;
}

inline
ios_base&
right(ios_base& __str)
{
    __str.setf(ios_base::right, ios_base::adjustfield);
    return __str;
}

inline
ios_base&
dec(ios_base& __str)
{
    __str.setf(ios_base::dec, ios_base::basefield);
    return __str;
}

inline
ios_base&
hex(ios_base& __str)
{
    __str.setf(ios_base::hex, ios_base::basefield);
    return __str;
}

inline
ios_base&
oct(ios_base& __str)
{
    __str.setf(ios_base::oct, ios_base::basefield);
    return __str;
}

inline
ios_base&
fixed(ios_base& __str)
{
    __str.setf(ios_base::fixed, ios_base::floatfield);
    return __str;
}

inline
ios_base&
scientific(ios_base& __str)
{
    __str.setf(ios_base::scientific, ios_base::floatfield);
    return __str;
}

inline
ios_base&
hexfloat(ios_base& __str)
{
    __str.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield);
    return __str;
}

inline
ios_base&
defaultfloat(ios_base& __str)
{
    __str.unsetf(ios_base::floatfield);
    return __str;
}

template <class _CharT, class _Traits>
class __save_flags
{
    typedef basic_ios<_CharT, _Traits> __stream_type;
    typedef typename __stream_type::fmtflags fmtflags;

    __stream_type& __stream_;
    fmtflags       __fmtflags_;
    _CharT         __fill_;

    __save_flags(const __save_flags&);
    __save_flags& operator=(const __save_flags&);
public:
    _LIBCPP_INLINE_VISIBILITY
    explicit __save_flags(__stream_type& __stream)
        : __stream_(__stream),
          __fmtflags_(__stream.flags()),
          __fill_(__stream.fill())
        {}
    _LIBCPP_INLINE_VISIBILITY
    ~__save_flags()
    {
        __stream_.flags(__fmtflags_);
        __stream_.fill(__fill_);
    }
};

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_IOS