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Showing content from https://timsong-cpp.github.io/cppwp/n4140/iostreams.base below:

[iostreams.base]

27 Input/output library [input.output] 27.5 Iostreams base classes [iostreams.base] 27.5.1 Overview [iostreams.base.overview]

Header <ios> synopsis

#include <iosfwd>

namespace std {
  typedef implementation-defined streamoff;
  typedef implementation-defined streamsize;
  template <class stateT> class fpos;

  class ios_base;
  template <class charT, class traits = char_traits<charT> >
    class basic_ios;

    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);

    ios_base& internal   (ios_base& str);
  ios_base& left       (ios_base& str);
  ios_base& right      (ios_base& str);

    ios_base& dec        (ios_base& str);
  ios_base& hex        (ios_base& str);
  ios_base& oct        (ios_base& str);

    ios_base& fixed      (ios_base& str);
  ios_base& scientific (ios_base& str);
  ios_base& hexfloat   (ios_base& str);
  ios_base& defaultfloat(ios_base& str);

    enum class io_errc {
    stream = 1
  };

  template <> struct is_error_code_enum<io_errc> : public true_type { };
  error_code make_error_code(io_errc e) noexcept;
  error_condition make_error_condition(io_errc e) noexcept;
  const error_category& iostream_category() noexcept;
}

27.5.2 Types [stream.types]

typedef implementation-defined streamoff;

The type streamoff is a synonym for one of the signed basic integral types of sufficient size to represent the maximum possible file size for the operating system.297

typedef implementation-defined streamsize;

The type streamsize is a synonym for one of the signed basic integral types. It is used to represent the number of characters transferred in an I/O operation, or the size of I/O buffers.298

27.5.3 Class ios_base [ios.base]

namespace std {
  class ios_base {
  public:
    class failure;

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

        typedef T2 iostate;
    static constexpr iostate badbit = unspecified;
    static constexpr iostate eofbit = unspecified;
    static constexpr iostate failbit = unspecified;
    static constexpr iostate goodbit = see below;

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

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

    class Init;

        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);

        locale imbue(const locale& loc);
    locale getloc() const;

        static int xalloc();
    long&  iword(int index);
    void*& pword(int index);

        virtual ~ios_base();

        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();

  private:
    static int index;      long* iarray;          void** parray;       };
}

ios_base defines several member types:

a class failure derived from system_error;
a class Init;
three bitmask types, fmtflags, iostate, and openmode;
an enumerated type, seekdir.

It maintains several kinds of data:

state information that reflects the integrity of the stream buffer;
control information that influences how to interpret (format) input sequences and how to generate (format) output sequences;
additional information that is stored by the program for its private use.

[ Note: For the sake of exposition, the maintained data is presented here as:

static int index, specifies the next available unique index for the integer or pointer arrays maintained for the private use of the program, initialized to an unspecified value;
long* iarray, points to the first element of an arbitrary-length long array maintained for the private use of the program;
void** parray, points to the first element of an arbitrary-length pointer array maintained for the private use of the program. — end note ]

27.5.3.1 Types [ios.types] 27.5.3.1.1 Class ios_base::failure [ios::failure]

namespace std {
  class 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);
  };
}

The class failure defines the base class for the types of all objects thrown as exceptions, by functions in the iostreams library, to report errors detected during stream buffer operations.

When throwing ios_base::failure exceptions, implementations should provide values of ec that identify the specific reason for the failure. [ Note: Errors arising from the operating system would typically be reported as system_category() errors with an error value of the error number reported by the operating system. Errors arising from within the stream library would typically be reported as error_code(io_errc::stream, iostream_category()). — end note ]

explicit failure(const string& msg, const error_code& ec = io_errc::stream);

Effects: Constructs an object of class failure by constructing the base class with msg and ec.

explicit failure(const char* msg, const error_code& ec = io_errc::stream);

Effects: Constructs an object of class failure by constructing the base class with msg and ec.

27.5.3.1.2 Type ios_base::fmtflags [ios::fmtflags]

typedef T1 fmtflags;

The type fmtflags is a bitmask type ([bitmask.types]). Setting its elements has the effects indicated in Table [tab:iostreams.fmtflags.effects].

Table

122

—

fmtflags

effects

Element Effect(s) if set boolalpha insert and extract bool type in alphabetic format dec converts integer input or generates integer output in decimal base fixed generate floating-point output in fixed-point notation hex converts integer input or generates integer output in hexadecimal base internal adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated left adds fill characters on the right (final positions) of certain generated output oct converts integer input or generates integer output in octal base right adds fill characters on the left (initial positions) of certain generated output scientific generates floating-point output in scientific notation showbase generates a prefix indicating the numeric base of generated integer output showpoint generates a decimal-point character unconditionally in generated floating-point output showpos generates a + sign in non-negative generated numeric output skipws skips leading whitespace before certain input operations unitbuf flushes output after each output operation uppercase replaces certain lowercase letters with their uppercase equivalents in generated output

Type fmtflags also defines the constants indicated in Table [tab:iostreams.fmtflags.constants].

Table

123

—

fmtflags

constants

typedef T2 iostate;

The type iostate is a bitmask type ([bitmask.types]) that contains the elements indicated in Table [tab:iostreams.iostate.effects].

Table

124

—

iostate

effects

Element Effect(s) if set badbit indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file); eofbit indicates that an input operation reached the end of an input sequence; failbit indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.

Type iostate also defines the constant:

goodbit, the value zero.

27.5.3.1.4 Type ios_base::openmode [ios::openmode]

typedef T3 openmode;

The type openmode is a bitmask type ([bitmask.types]). It contains the elements indicated in Table [tab:iostreams.openmode.effects].

Table

125

—

openmode

effects

Element Effect(s) if set app seek to end before each write ate open and seek to end immediately after opening binary perform input and output in binary mode (as opposed to text mode) in open for input out open for output trunc truncate an existing stream when opening 27.5.3.1.5 Type ios_base::seekdir [ios::seekdir]

typedef T4 seekdir;

The type seekdir is an enumerated type ([enumerated.types]) that contains the elements indicated in Table [tab:iostreams.seekdir.effects].

Table

126

—

seekdir

effects

Element Meaning beg request a seek (for subsequent input or output) relative to the beginning of the stream cur request a seek relative to the current position within the sequence end request a seek relative to the current end of the sequence 27.5.3.1.6 Class ios_base::Init [ios::Init]

namespace std {
  class ios_base::Init {
  public:
    Init();
   ~Init();
  private:
    static int init_cnt;   };
}

The class Init describes an object whose construction ensures the construction of the eight objects declared in <iostream> ([iostream.objects]) that associate file stream buffers with the standard C streams provided for by the functions declared in <cstdio> ([c.files]).

For the sake of exposition, the maintained data is presented here as:

static int init_cnt, counts the number of constructor and destructor calls for class Init, initialized to zero.

Init();

Effects: Constructs an object of class Init. Constructs and initializes the objects cin, cout, cerr, clog, wcin, wcout, wcerr, and wclog if they have not already been constructed and initialized.

~Init();

Effects: Destroys an object of class Init. If there are no other instances of the class still in existence, calls cout.flush(), cerr.flush(), clog.flush(), wcout.flush(), wcerr.flush(), wclog.flush().

27.5.3.2 ios_base state functions [fmtflags.state]

fmtflags flags() const;

Returns: The format control information for both input and output.

fmtflags flags(fmtflags fmtfl);

Postcondition: fmtfl == flags().

Returns: The previous value of flags().

fmtflags setf(fmtflags fmtfl);

Effects: Sets fmtfl in flags().

Returns: The previous value of flags().

fmtflags setf(fmtflags fmtfl, fmtflags mask);

Effects: Clears mask in flags(), sets fmtfl & mask in flags().

Returns: The previous value of flags().

void unsetf(fmtflags mask);

Effects: Clears mask in flags().

streamsize precision() const;

Returns: The precision to generate on certain output conversions.

streamsize precision(streamsize prec);

Postcondition: prec == precision().

Returns: The previous value of precision().

streamsize width() const;

Returns: The minimum field width (number of characters) to generate on certain output conversions.

streamsize width(streamsize wide);

Postcondition: wide == width().

Returns: The previous value of width().

27.5.3.3 ios_base functions [ios.base.locales]

locale imbue(const locale& loc);

Effects: Calls each registered callback pair (fn,index) ([ios.base.callback]) as (*fn)(imbue_event,*this,index) at such a time that a call to ios_base::getloc() from within fn returns the new locale value loc.

Returns: The previous value of getloc().

Postcondition: loc == getloc().

locale getloc() const;

Returns: If no locale has been imbued, a copy of the global C++ locale, locale(), in effect at the time of construction. Otherwise, returns the imbued locale, to be used to perform locale-dependent input and output operations.

27.5.3.4 ios_base static members [ios.members.static]

bool sync_with_stdio(bool sync = true);

Returns: true if the previous state of the standard iostream objects ([iostream.objects]) was synchronized and otherwise returns false. The first time it is called, the function returns true.

Effects: If any input or output operation has occurred using the standard streams prior to the call, the effect is implementation-defined. Otherwise, called with a false argument, it allows the standard streams to operate independently of the standard C streams.

When a standard iostream object str is synchronized with a standard stdio stream f, the effect of inserting a character c by

fputc(f, c);

is the same as the effect of

str.rdbuf()->sputc(c);

for any sequences of characters; the effect of extracting a character c by

c = fgetc(f);

is the same as the effect of

c = str.rdbuf()->sbumpc();

for any sequences of characters; and the effect of pushing back a character c by

ungetc(c, f);

is the same as the effect of

str.rdbuf()->sputbackc(c);

for any sequence of characters.299

27.5.3.5 ios_base storage functions [ios.base.storage]

static int xalloc();

Remarks: Concurrent access to this function by multiple threads shall not result in a data race ([intro.multithread]).

long& iword(int idx);

Effects: If iarray is a null pointer, allocates an array of long of unspecified size and stores a pointer to its first element in iarray. The function then extends the array pointed at by iarray as necessary to include the element iarray[idx]. Each newly allocated element of the array is initialized to zero. The reference returned is invalid after any other operations on the object.300 However, the value of the storage referred to is retained, so that until the next call to copyfmt, calling iword with the same index yields another reference to the same value. If the function fails301 and *this is a base subobject of a basic_ios<> object or subobject, the effect is equivalent to calling basic_ios<>::setstate(badbit) on the derived object (which may throw failure).

Returns: On success iarray[idx]. On failure, a valid long& initialized to 0.

void*& pword(int idx);

Effects: If parray is a null pointer, allocates an array of pointers to void of unspecified size and stores a pointer to its first element in parray. The function then extends the array pointed at by parray as necessary to include the element parray[idx]. Each newly allocated element of the array is initialized to a null pointer. The reference returned is invalid after any other operations on the object. However, the value of the storage referred to is retained, so that until the next call to copyfmt, calling pword with the same index yields another reference to the same value. If the function fails302 and *this is a base subobject of a basic_ios<> object or subobject, the effect is equivalent to calling basic_ios<>::setstate(badbit) on the derived object (which may throw failure).

Returns: On success parray[idx]. On failure a valid void*& initialized to 0.

Remarks: After a subsequent call to pword(int) for the same object, the earlier return value may no longer be valid.

27.5.3.6 ios_base callbacks [ios.base.callback]

void register_callback(event_callback fn, int index);

Effects: Registers the pair (fn,index) such that during calls to imbue() ([ios.base.locales]), copyfmt(), or ~ios_base() ([ios.base.cons]), the function fn is called with argument index. Functions registered are called when an event occurs, in opposite order of registration. Functions registered while a callback function is active are not called until the next event.

Requires: The function fn shall not throw exceptions.

Remarks: Identical pairs are not merged. A function registered twice will be called twice.

27.5.3.7 ios_base constructors/destructor [ios.base.cons]

ios_base();

Effects: Each ios_base member has an indeterminate value after construction. The object's members shall be initialized by calling basic_ios::init before the object's first use or before it is destroyed, whichever comes first; otherwise the behavior is undefined.

~ios_base();

Effects: Destroys an object of class ios_base. Calls each registered callback pair (fn, index) ([ios.base.callback]) as (*fn)(erase_event, *this, index) at such time that any ios_base member function called from within fn has well defined results.

27.5.4 Class template fpos [fpos]

namespace std {
  template <class stateT> class fpos {
  public:
        stateT state() const;
    void state(stateT);
  private;
    stateT st;   };
}

27.5.4.1 fpos members [fpos.members]

void state(stateT s);

stateT state() const;

Returns: Current value of st.

27.5.4.2 fpos requirements [fpos.operations]

Operations specified in Table [tab:iostreams.position.requirements] are permitted. In that table,

P refers to an instance of fpos,
p and q refer to values of type P,
O refers to type streamoff,
o refers to a value of type streamoff,
sz refers to a value of type streamsize and
i refers to a value of type int.

Table

127

— Position type requirements

Expression Return type Operational Assertion/note semantics pre-/post-condition P(i) p == P(i)
note: a destructor is assumed. P p(i);
P p = i; post: p == P(i). P(o) fpos converts from offset O(p) streamoff converts to offset P(O(p)) == p p == q convertible to bool == is an equivalence relation p != q convertible to bool !(p == q) q = p + o
p += o fpos + offset q - o == p q = p - o
p -= o fpos - offset q + o == p o = p - q streamoff distance q + o == p streamsize(o)
O(sz) streamsize
streamoff converts
converts streamsize(O(sz)) == sz
streamsize(O(sz)) == sz

[ Note: Every implementation is required to supply overloaded operators on fpos objects to satisfy the requirements of [fpos.operations]. It is unspecified whether these operators are members of fpos, global operators, or provided in some other way. — end note ]

Stream operations that return a value of type traits::pos_type return P(O(-1)) as an invalid value to signal an error. If this value is used as an argument to any istream, ostream, or streambuf member that accepts a value of type traits::pos_type then the behavior of that function is undefined.

27.5.5 Class template basic_ios [ios] 27.5.5.1 Overview [ios.overview]

namespace std {
  template <class charT, class traits = char_traits<charT> >
  class basic_ios : public ios_base {
  public:

        typedef charT                     char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;
    typedef traits                    traits_type;

    explicit operator bool() 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);

        explicit basic_ios(basic_streambuf<charT,traits>* sb);
    virtual ~basic_ios();

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

  };
}

27.5.5.2 basic_ios constructors [basic.ios.cons]

explicit basic_ios(basic_streambuf<charT,traits>* sb);

Effects: Constructs an object of class basic_ios, assigning initial values to its member objects by calling init(sb).

basic_ios();

Effects: Constructs an object of class basic_ios ([ios.base.cons]) leaving its member objects uninitialized. The object shall be initialized by calling basic_ios::init before its first use or before it is destroyed, whichever comes first; otherwise the behavior is undefined.

~basic_ios();

Remarks: The destructor does not destroy rdbuf().

void init(basic_streambuf<charT,traits>* sb);

Postconditions: The postconditions of this function are indicated in Table [tab:iostreams.basicios.init.effects].

Table

128

—

basic_ios::init()

effects

Element Value rdbuf() sb tie() 0 rdstate() goodbit if sb is not a null pointer, otherwise badbit. exceptions() goodbit flags() skipws | dec width() 0 precision() 6 fill() widen(' '); getloc() a copy of the value returned by locale() iarray a null pointer parray a null pointer 27.5.5.3 Member functions [basic.ios.members]

basic_ostream<charT,traits>* tie() const;

Returns: An output sequence that is tied to (synchronized with) the sequence controlled by the stream buffer.

basic_ostream<charT,traits>* tie(basic_ostream<charT,traits>* tiestr);

Requires: If tiestr is not null, tiestr must not be reachable by traversing the linked list of tied stream objects starting from tiestr->tie().

Postcondition: tiestr == tie().

Returns: The previous value of tie().

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

Returns: A pointer to the streambuf associated with the stream.

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

Postcondition: sb == rdbuf().

Returns: The previous value of rdbuf().

locale imbue(const locale& loc);

Returns: The prior value of ios_base::imbue().

char narrow(char_type c, char dfault) const;

Returns: use_facet< ctype<char_type> >(getloc()).narrow(c,dfault)

char_type widen(char c) const;

Returns: use_facet< ctype<char_type> >(getloc()).widen(c)

char_type fill() const;

Returns: The character used to pad (fill) an output conversion to the specified field width.

char_type fill(char_type fillch);

Postcondition: traits::eq(fillch, fill())

Returns: The previous value of fill().

basic_ios& copyfmt(const basic_ios& rhs);

Effects: If (this == &rhs) does nothing. Otherwise assigns to the member objects of *this the corresponding member objects of rhs as follows:

calls each registered callback pair (fn, index) as (*fn)(erase_event, *this, index);
assigns to the member objects of *this the corresponding member objects of rhs, except that
- rdstate(), rdbuf(), and exceptions() are left unchanged;
- the contents of arrays pointed at by pword and iword are copied, not the pointers themselves;303 and
- if any newly stored pointer values in *this point at objects stored outside the object rhs and those objects are destroyed when rhs is destroyed, the newly stored pointer values are altered to point at newly constructed copies of the objects;
calls each callback pair that was copied from rhs as (*fn)(copyfmt_event, *this, index);
calls exceptions(rhs.except()).

Note: The second pass through the callback pairs permits a copied pword value to be zeroed, or to have its referent deep copied or reference counted, or to have other special action taken.

Postconditions: The postconditions of this function are indicated in Table [tab:iostreams.copyfmt.effects].

Table

129

—

basic_ios::copyfmt()

effects

Element Value rdbuf() unchanged tie() rhs.tie() rdstate() unchanged exceptions() rhs.exceptions() flags() rhs.flags() width() rhs.width() precision() rhs.precision() fill() rhs.fill() getloc() rhs.getloc()

void move(basic_ios& rhs); void move(basic_ios&& rhs);

Postconditions: *this shall have the state that rhs had before the function call, except that rdbuf() shall return 0. rhs shall be in a valid but unspecified state, except that rhs.rdbuf() shall return the same value as it returned before the function call, and rhs.tie() shall return 0.

void swap(basic_ios& rhs) noexcept;

Effects: The states of *this and rhs shall be exchanged, except that rdbuf() shall return the same value as it returned before the function call, and rhs.rdbuf() shall return the same value as it returned before the function call.

void set_rdbuf(basic_streambuf<charT, traits>* sb);

Effects: Associates the basic_streambuf object pointed to by sb with this stream without calling clear().

Postconditions: rdbuf() == sb.

27.5.5.4 basic_ios flags functions [iostate.flags]

explicit operator bool() const;

bool operator!() const;

iostate rdstate() const;

Returns: The error state of the stream buffer.

void clear(iostate state = goodbit);

Postcondition: If rdbuf()!=0 then state == rdstate(); otherwise rdstate()==(state | ios_base::badbit).

Effects: If ((state | (rdbuf() ? goodbit : badbit)) & exceptions()) == 0, returns. Otherwise, the function throws an object fail of class basic_ios::failure ([ios::failure]), constructed with implementation-defined argument values.

void setstate(iostate state);

Effects: Calls clear(rdstate() | state) (which may throw basic_ios::failure ([ios::failure])).

bool good() const;

bool eof() const;

Returns: true if eofbit is set in rdstate().

bool fail() const;

Returns: true if failbit or badbit is set in rdstate().304

bool bad() const;

Returns: true if badbit is set in rdstate().

iostate exceptions() const;

Returns: A mask that determines what elements set in rdstate() cause exceptions to be thrown.

void exceptions(iostate except);

Postcondition: except == exceptions().

Effects: Calls clear(rdstate()).

27.5.6 ios_base manipulators [std.ios.manip] 27.5.6.1 fmtflags manipulators [fmtflags.manip]

ios_base& boolalpha(ios_base& str);

Effects: Calls str.setf(ios_base::boolalpha).

ios_base& noboolalpha(ios_base& str);

Effects: Calls str.unsetf(ios_base::boolalpha).

ios_base& showbase(ios_base& str);

Effects: Calls str.setf(ios_base::showbase).

ios_base& noshowbase(ios_base& str);

Effects: Calls str.unsetf(ios_base::showbase).

ios_base& showpoint(ios_base& str);

Effects: Calls str.setf(ios_base::showpoint).

ios_base& noshowpoint(ios_base& str);

Effects: Calls str.unsetf(ios_base::showpoint).

ios_base& showpos(ios_base& str);

Effects: Calls str.setf(ios_base::showpos).

ios_base& noshowpos(ios_base& str);

Effects: Calls str.unsetf(ios_base::showpos).

ios_base& skipws(ios_base& str);

Effects: Calls str.setf(ios_base::skipws).

ios_base& noskipws(ios_base& str);

Effects: Calls str.unsetf(ios_base::skipws).

ios_base& uppercase(ios_base& str);

Effects: Calls str.setf(ios_base::uppercase).

ios_base& nouppercase(ios_base& str);

Effects: Calls str.unsetf(ios_base::uppercase).

ios_base& unitbuf(ios_base& str);

Effects: Calls str.setf(ios_base::unitbuf).

ios_base& nounitbuf(ios_base& str);

Effects: Calls str.unsetf(ios_base::unitbuf).

27.5.6.2 adjustfield manipulators [adjustfield.manip]

ios_base& internal(ios_base& str);

Effects: Calls str.setf(ios_base::internal, ios_base::adjustfield).

ios_base& left(ios_base& str);

Effects: Calls str.setf(ios_base::left, ios_base::adjustfield).

ios_base& right(ios_base& str);

Effects: Calls str.setf(ios_base::right, ios_base::adjustfield).

27.5.6.3 basefield manipulators [basefield.manip]

ios_base& dec(ios_base& str);

Effects: Calls str.setf(ios_base::dec, ios_base::basefield).

ios_base& hex(ios_base& str);

Effects: Calls str.setf(ios_base::hex, ios_base::basefield).

ios_base& oct(ios_base& str);

Effects: Calls str.setf(ios_base::oct, ios_base::basefield).

27.5.6.4 floatfield manipulators [floatfield.manip]

ios_base& fixed(ios_base& str);

Effects: Calls str.setf(ios_base::fixed, ios_base::floatfield).

ios_base& scientific(ios_base& str);

Effects: Calls str.setf(ios_base::scientific, ios_base::floatfield).

ios_base& hexfloat(ios_base& str);

Effects: Calls str.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield).

[ Note: The more obvious use of ios_base::hex to specify hexadecimal floating-point format would change the meaning of existing well defined programs. C++2003 gives no meaning to the combination of fixed and scientific. — end note ]

ios_base& defaultfloat(ios_base& str);

Effects: Calls str.unsetf(ios_base::floatfield).

27.5.6.5 Error reporting [error.reporting]

error_code make_error_code(io_errc e) noexcept;

Returns: error_code(static_cast<int>(e), iostream_category()).

error_condition make_error_condition(io_errc e) noexcept;

Returns: error_condition(static_cast<int>(e), iostream_category()).

const error_category& iostream_category() noexcept;

Returns: A reference to an object of a type derived from class error_category.

The object's default_error_condition and equivalent virtual functions shall behave as specified for the class error_category. The object's name virtual function shall return a pointer to the string "iostream".

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