ios(3C++std)

basic_ios , fpos , ios , ios_base , streamoff , streampos , streamsize , wios , wstreampos , Manipulators: boolalpha , dec , fixed , hex , internal , left , noboolalpha , noshowbase , noshowpoint , noshowpos , noskipws , nounitbuf , nouppercase , oct , right , scientific , showbase , showpoint , showpos , skipws , unitbuf , uppercase - defines the template class that serves as the base for many iostreams classes

Synopsis

   namespace std {
   typedef T1 streamoff;
   typedef T2 streamsize;
   class ios_base;

           // TEMPLATE CLASSES
   template <class E, class T = char_traits<E> >
       class basic_ios;
   typedef basic_ios<char, char_traits<char> > ios;
   typedef basic_ios<wchar_t, char_traits<wchar_t> >
       wios;
   template <class St>
       class fpos;
   typedef fpos<mbstate_t> streampos;
   typedef fpos<mbstate_t> wstreampos;

           // 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& unitbuf(ios_base& str);
   ios_base& nounitbuf(ios_base& str);
   ios_base& uppercase(ios_base& str);
   ios_base& nouppercase(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);
       };

Description

Include the iostreams standard header <ios> to define several types and functions basic to the operation of iostreams. (This header is typically included for you by another of the iostreams headers. You seldom have occasion to include it directly.)

A large group of functions are manipulators. A manipulator declared in <ios> alters the values stored in its argument object of class ios_base. Other manipulators perform actions on streams controlled by objects of a type derived from this class, such as a specialization of one of the template classes basic_istream or basic_ostream. For example, noskipws(str) clears the format flag ios_base::skipws in the object str, which might be of one of these types.

You can also call a manipulator by inserting it into an output stream or extracting it from an input stream, thanks to some special machinery supplied in the classes derived from ios_base. For example:

   istr >> noskipws;

calls noskipws(istr).

basic_ios

bad , basic_ios , char_type , clear , copyfmt , eof , exceptions , init , fail , good , imbue , init , int_type , narrow , off_type , operator! , operator void * , pos_type , rdbuf , rdstate , setstate , tie , traits_type , widen

   template <class E, class T = char_traits<E> >
       class basic_ios : public ios_base {
   public:
       typedef E char_type;
       typedef T traits_type;
       typedef typename T::int_type int_type;
       typedef typename T::pos_type pos_type;
       typedef typename T::off_type off_type;
       explicit basic_ios(basic_streambuf<E, T> *sb);
       virtual ~basic_ios();
       operator void *() 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;
       iostate exceptions(iostate except);
       basic_ios& copyfmt(const basic_ios& rhs);
       locale imbue(const locale& loc);
       char_type widen(char ch);
       char narrow(char_type ch, char dflt);
       char_type fill() const;
       char_type fill(char_type ch);
       basic_ostream<E, T> *tie() const;
       basic_ostream<E, T> *tie(basic_ostream<E, T> *str);
       basic_streambuf<E, T> *rdbuf() const;
       basic_streambuf<E, T>
           *rdbuf(basic_streambuf<E, T> *sb);
       E widen(char ch);
       char narrow(E ch, char dflt);
   protected:
       void init(basic_streambuf<E, T> *sb);
       basic_ios();
       basic_ios(const facet&);     // not defined
       void operator=(const facet&) // not defined
           };

The template class describes the storage and member functions common to both input streams (of template class basic_istream) and output streams (of template class basic_ostream) that depend on the template parameters. (The class ios_base describes what is common and not dependent on template parameters. An object of class basic_ios<E, T> helps control a stream with elements of type E, whose character traits are determined by the class T.

An object of class basic_ios<E, T> stores:

a tie pointer to an object of type basic_ostream<E, T>
a stream buffer pointer to an object of type basic_streambuf<E, T>
formatting information
stream state information in a base object of type ios_base
a fill character in an object of type char_type

basic_ios::bad

   bool bad() const;

The member function returns true if rdstate() & badbit is nonzero.

basic_ios::basic_ios

   explicit basic_ios(basic_streambuf<E, T> *sb);
   basic_ios();

The first constructor initializes its member objects by calling init(sb). The second (protected) constructor leaves its member objects uninitialized. A later call to init must initialize the object before it can be safely destroyed.

basic_ios::char_type

   typedef E char_type;

The type is a synonym for the template parameter E.

basic_ios::clear

   void clear(iostate state = goodbit);

The member function replaces the stored stream state information with state | (rdbuf() != 0 ? goodbit : badbit). If state & exceptions() is nonzero, it then throws an object of class failure.

basic_ios::copyfmt

   basic_ios& copyfmt(const basic_ios& rhs);

The member function reports the callback event erase_event. It then copies from rhs into *this the fill character, the tie pointer, and the formatting information. Before altering the exception mask, it reports the callback event copyfmt_event. If, after the copy is complete, state & exceptions() is nonzero, the function effectively calls clear with the argument rdstate(). It returns *this.

basic_ios::eof

   bool eof() const;

The member function returns true if rdstate() & eofbit is nonzero.

basic_ios::exceptions

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

The first member function returns the stored exception mask. The second member function stores except in the exception mask and returns its previous stored value. Note that storing a new exception mask can throw an exception just like the call clear( rdstate()).

basic_ios::fail

   bool fail() const;

The member function returns true if rdstate() & failbit is nonzero.

basic_ios::fill

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

The first member function returns the stored fill character. The second member function stores ch in the fill character and returns its previous stored value.

basic_ios::good

   bool good() const;

The member function returns true if rdstate() == goodbit (no state flags are set).

basic_ios::imbue

   locale imbue(const locale& loc);

If rdbuf is not a null pointer, the member function calls rdbuf()->pubimbue(loc). In any case, it returns ios_base::imbue(loc).

basic_ios::init

   void init(basic_streambuf<E, T> *sb);

The member function stores values in all member objects, so that:

rdbuf() returns sb
tie() returns a null pointer
rdstate() returns goodbit if sb is nonzero; otherwise, it returns badbit
exceptions() returns goodbit
flags() returns skipws | dec
width() returns zero
precision() returns 6
fill() returns the space character
getloc() returns locale::classic()
iword returns zero and pword returns a null pointer for all argument value

basic_ios::int_type

   typedef typename T::int_type int_type;

The type is a synonym for T::int_type.

basic_ios::narrow

   char narrow(char_type ch, char dflt);

The member function returns use_facet< ctype<E> >( getloc()). narrow(ch, dflt).

basic_ios::off_type

   typedef typename T::off_type off_type;

The type is a synonym for T::off_type.

basic_ios::operator void *

   operator void *() const;

The operator returns a null pointer only if fail().

basic_ios::operator!

   bool operator!() const;

The operator returns fail().

basic_ios::pos_type

   typedef typename T::pos_type pos_type;

The type is a synonym for T::pos_type.

basic_ios::rdbuf

   basic_streambuf<E, T> *rdbuf() const;
   basic_streambuf<E, T> *rdbuf(basic_streambuf<E, T> *sb);

The first member function returns the stored stream buffer pointer.

The second member function stores sb in the stored stream buffer pointer and returns the previously stored value.

basic_ios::rdstate

   iostate rdstate() const;

The member function returns the stored stream state information.

basic_ios::setstate

   void setstate(iostate state);

The member function effectively calls clear(state | rdstate()).

basic_ios::tie

   basic_ostream<E, T> *tie() const;
   basic_ostream<E, T> *tie(basic_ostream<E, T> *str);

The first member function returns the stored tie pointer. The second member function stores str in the tie pointer and returns its previous stored value.

basic_ios::traits_type

   typedef T traits_type;

The type is a synonym for the template parameter T.

basic_ios::widen

   char_type widen(char ch);

The member function returns use_facet< ctype<E> >( getloc()). widen(ch).

boolalpha

   ios_base& boolalpha(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: boolalpha), then returns str.

dec

   ios_base& dec(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: dec, ios_base:: basefield), then returns str.

fixed

   ios_base& fixed(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: fixed, ios_base:: floatfield), then returns str.

fpos

   template <class St>
       class fpos {
   public:
       fpos(streamoff off);
       explicit fpos(St state);
       St state() const;
       void state(St state);
       operator streamoff() const;
       streamoff operator-(const fpos& rhs) const;
       fpos& operator+=(streamoff off);
       fpos& operator-=(streamoff off);
       fpos operator+(streamoff off) const;
       fpos operator-(streamoff off) const;
       bool operator==(const fpos& rhs) const;
       bool operator!=(const fpos& rhs) const;
       };

The template class describes an object that can store all the information needed to restore an arbitrary file-position indicator within any stream. An object of class fpos<St> effectively stores at least two member objects:

a byte offset, of type streamoff
a conversion state, for use by an object of class basic_filebuf, of type St, typically mbstate_t

It can also store an arbitrary file position, for use by an object of class basic_filebuf, of type fpos_t. For an environment with limited file size, however, streamoff and fpos_t may sometimes be used interchangeably. And for an environment with no streams that have a state-dependent encoding, mbstate_t may actually be unused. So the number of member objects stored may vary.

fpos::fpos

   fpos(streamoff off);
   explicit fpos(St state);

The first constructor stores the offset off, relative to the beginning of file and in the initial conversion state (if that matters). If off is -1, the resulting object represents an invalid stream position.

The second constructor stores a zero offset and the object state.

fpos::operator!=

   bool operator!=(const fpos& rhs) const;

The member function returns !(*this == rhs).

fpos::operator+

   fpos operator+(streamoff off) const;

The member function returns fpos(*this) += off.

fpos::operator+=

   fpos& operator+=(streamoff off);

The member function adds off to the stored offset member object, then returns *this. For positioning within a file, the result is generally valid only for binary streams that do not have a state-dependent encoding.

fpos::operator-

   streamoff operator-(const fpos& rhs) const;
   fpos operator-(streamoff off) const;

The first member function returns (streamoff)*this - (streamoff)rhs. The second member function returns fpos(*this) -= off.

fpos::operator-=

   fpos& operator-=(streamoff off);

The member function returns fpos(*this) -= off. For positioning within a file, the result is generally valid only for binary streams that do not have a state-dependent encoding.

fpos::operator==

   bool operator==(const fpos& rhs) const;

The member function returns (streamoff)*this == (streamoff)rhs.

fpos::operator streamoff

   operator streamoff() const;

The member function returns the stored offset member object, plus any additional offset stored as part of the fpos_t member object.

fpos::state

   St state() const;
   void state(St state);

The first member function returns the value stored in the St member object. The second member function stores state in the St member object.

hex

   ios_base& hex(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: hex, ios_base:: basefield), then returns str.

internal

   ios_base& internal(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: internal, ios_base:: adjustfield), then returns str.

ios

   typedef basic_ios<char, char_traits<char> > ios;

The type is a synonym for template class basic_ios, specialized for elements of type char with default character traits.

ios_base

event , event_callback , failure , flags , fmtflags , getloc , imbue , Init , ios_base , iostate , iword , openmode , operator= , precision , pword , register_callback , seekdir , setf , sync_with_stdio , unsetf , width , xalloc

   class ios_base {
   public:
       class failure;
       typedef T1 fmtflags;
       static const fmtflags boolalpha, dec, fixed, hex,
           internal, left, oct, right, scientific,
           showbase, showpoint, showpos, skipws, unitbuf,
           uppercase, adjustfield, basefield, floatfield;
       typedef T2 iostate;
       static const iostate badbit, eofbit, failbit,
           goodbit;
       typedef T3 openmode;
       static const openmode app, ate, binary, in, out,
           trunc;
       typedef T4 seekdir;
       static const seekdir beg, cur, end;
       enum event {
           copyfmt_event, erase_event,
           imbue_event};
       static const event copyfmt_event, erase_event,
           copyfmt_event;
       class Init;
       ios_base& operator=(const ios_base& rhs);
       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;
       stramsize width(streamsize wide);
       locale imbue(const locale& loc);
       locale getloc() const;
       static int xalloc();
       long& iword(int idx);
       void *& pword(int idx);
       typedef void *(event_callback(event ev,
           ios_base& ios, int idx);
       void register_callback(event_callback pfn, int idx);
       static bool sync_with_stdio(bool sync = true);
   protected:
       ios_base();
       };

The class describes the storage and member functions common to both input and output streams that does not depend on the template parameters. (The template class basic_ios describes what is common and is dependent on template parameters.

An object of class ios_base stores formatting information, which consists of:

format flags in an object of type fmtflags
an exception mask in an object of type iostate
a field width in an object of type int
a display precison in an object of type int
a locale object in an object of type locale
two extensible arrays, with elements of type long and void pointer

An object of class ios_base also stores stream state information, in an object of type iostate, and a callback stack.

ios_base::event

   enum event {
       copyfmt_event, erase_event,
       imbue_event};

The type is an enumeration that describes an object that can store the callback event used as an argument to a function registered with register_callback. The distinct event values are:

copyfmt_event, to identify a callback that occurs near the end of a call to copyfmt, just before the exception mask is copied.
erase_event, to identify a callback that occurs at the beginning of a call to copyfmt, or at the beginning of a call to the destructor for *this.
imbue_event, to identify a callback that occurs at the end of a call to imbue, just before the function returns.

`ios_base::event_callback`

   typedef void *(event_callback(event ev,
           ios_base& ios, int idx);

The type describes a pointer to a function that can be registered with register_callback. Such a function must not throw an exception.

ios_base::failure

   class failure : public exception {
   public:
       explicit failure(const string& what_arg) {
       };

The member class serves as the base class for all exceptions thrown by the member function clear in template class basic_ios. The value returned by what() is what_arg.data().

ios_base::flags

   fmtflags flags() const;
   fmtflags flags(fmtflags fmtfl);

The first member function returns the stored format flags. The second member function stores fmtfl in the format flags and returns its previous stored value.

ios_base::fmtflags

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

The type is a bitmask type T1 that describes an object that can store format flags. The distinct flag values (elements) are:

boolalpha, to insert or extract objects of type bool as names (such as true and false) rather than as numeric values
dec, to insert or extract integer values in decimal format
fixed, to insert floating-point values in fixed-point format (with no exponent field)
hex, to insert or extract integer values in hexadecimal format
internal, to pad to a field width as needed by inserting fill characters at a point internal to a generated numeric field
left, to pad to a field width as needed by inserting fill characters at the end of a generated field (left justification)
oct, to insert or extract integer values in octal format
right, to pad to a field width as needed by inserting fill characters at the beginning of a generated field (right justification)
scientific, to insert floating-point values in scientific format (with an exponent field)
showbase, to insert a prefix that reveals the base of a generated integer field
showpoint, to insert a decimal point unconditionally in a generated floating-point field
showpos, to insert a plus sign in a non-negative generated numeric field
skipws, to skip leading white space before certain extractions
unitbuf, to flush output after each insertion
uppercase, to insert uppercase equivalents of lowercase letters in certain insertions

In addition, several useful values are:

adjustfield, internal | left | right
basefield, dec | hex | oct
floatfield, fixed | scientific

ios_base::getloc

   locale getloc() const;

The member function returns the stored locale object.

ios_base::imbue

   locale imbue(const locale& loc);

The member function stores loc in the locale object, then reports the callback event imbue_event. It returns the previous stored value.

ios_base::Init

   class Init {
       };

The nested class describes an object whose construction ensures that the standard iostreams objects are properly constructed, even before the execution of a constructor for an arbitrary static object.

ios_base::ios_base

   ios_base();

The (protected) constructor does nothing. A later call to basic_ios::init must initialize the object before it can be safely destroyed. Thus, the only safe use for class ios_base is as a base class for template class basic_ios.

ios_base::iostate

   typedef T2 iostate;
   static const iostate badbit, eofbit, failbit, goodbit;

The type is a bitmask type T2 that describes an object that can store stream state information. The distinct flag values (elements) are:

badbit, to record a loss of integrity of the stream buffer
eofbit, to record end-of-file while extracting from a stream
failbit, to record a failure to extract a valid field from a stream

In addition, a useful value is:

goodbit, no bits set

ios_base::iword

   long& iword(int idx);

The member function returns a reference to element idx of the extensible array with elements of type long. All elements are effectively present and initially store the value zero. The returned reference is invalid after the next call to iword for the object, after the object is altered by a call to basic_ios::copyfmt, or after the object is destroyed.

If idx is negative, or if unique storage is unavailable for the element, the function calls setstate(badbit) and returns a reference that might not be unique.

To obtain a unique index, for use across all objects of type ios_base, call xalloc.

ios_base::openmode

   typedef T3 openmode;
   static const openmode app, ate, binary, in, out, trunc;

The type is a bitmask type T3 that describes an object that can store the opening mode for several iostreams objects. The distinct flag values (elements) are:

app, to seek to the end of a stream before each insertion
ate, to seek to the end of a stream when its controlling object is first created
binary, to read a file as a binary stream, rather than as a text stream
in, to permit extraction from a stream
out, to permit insertion to a stream
trunc, to truncate an existing file when its controlling object is first created

ios_base::operator=

   ios_base& operator=(const ios_base& rhs);

The operator copies the stored formatting information, making a new copy of any extensible arrays. It then returns *this. Note that the callback stack is not copied.

ios_base::precision

   streamsize precision() const;
   streamsize precision(streamsize prec);

The first member function returns the stored display precision. The second member function stores prec in the display precision and returns its previous stored value.

ios_base::pword

   void *& pword(int idx);

The member function returns a reference to element idx of the extensible array with elements of type void pointer. All elements are effectively present and initially store the null pointer. The returned reference is invalid after the next call to pword for the object, after the object is altered by a call to basic_ios::copyfmt, or after the object is destroyed.

If idx is negative, or if unique storage is unavailable for the element, the function calls setstate(badbit) and returns a reference that might not be unique.

To obtain a unique index, for use across all objects of type ios_base, call xalloc.

`ios_base::register_callback`

   void register_callback(event_callback pfn, int idx);

The member function pushes the pair {pfn, idx} onto the stored callback stack. When a callback event ev is reported, the functions are called, in reverse order of registry, by the expression (*pfn)(ev, *this, idx).

ios_base::seekdir

   typedef T4 seekdir;
   static const seekdir beg, cur, end;

The type is an enumerated type T4 that describes an object that can store the seek mode used as an argument to the member functions of several iostreams classes. The distinct flag values are:

beg, to seek (alter the current read or write position) relative to the beginning oc a sequence (array, stream, or file)
cur, to seek relative to the current position within a sequence
end, to seek relative to the end of a sequence

ios_base::setf

   void setf(fmtflags mask);
   fmtflags setf(fmtflags fmtfl, fmtflags mask);

The first member function effectively calls flags(mask | flags()) (set selected bits), then returns the previous format flags. The second member function effectively calls flags(mask & fmtfl, flags() & ~mask) (replace selected bits under a mask), then returns the previous format flags.

ios_base::sync_with_stdio

   static bool sync_with_stdio(bool sync = true);

The static member function stores a stdio sync flag, which is initially true. When true, this flag ensures that operations on the same file are properly synchronized between the iostreams functions and those defined in the Standard C library. Otherwise, synchronization may or may not be guaranteed, but performance may be improved. The function stores sync in the stdio sync flag and returns its previous stored value. You can call it reliably only before performing any operations on the standard streams.

ios_base::unsetf

   void unsetf(fmtflags mask);

The member function effectively calls flags(~mask & flags()) (clear selected bits).

ios_base::width

   streamsize width() const;
   streamsize width(streamsize wide);

The first member function returns the stored field width. The second member function stores wide in the field width and returns its previous stored value.

ios_base::xalloc

   static int xalloc();

The static member function returns a stored static value, which it increments on each call. You can use the return value as a unique index argument when calling the member functions iword or pword.

left

   ios_base& left(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: left, ios_base:: adjustfield), then returns str.

noboolalpha

   ios_base& noboolalpha(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: boolalpha), then returns str.

noshowbase

   ios_base& noshowbase(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: showbase), then returns str.

noshowpoint

   ios_base& noshowpoint(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: showpoint), then returns str.

noshowpos

   ios_base& noshowpos(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: showpos"), then returns str.

noskipws

   ios_base& noskipws(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: skipws), then returns str.

nounitbuf

   ios_base& nounitbuf(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: unitbuf), then returns str.

nouppercase

   ios_base& nouppercase(ios_base& str);

The manipulator effectively calls str.unsetf(ios_base:: uppercase), then returns str.

oct

   ios_base& oct(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: oct, ios_base:: basefield), then returns str.

right

   ios_base& right(ios_base& str);

The maiipulator effectively calls str.setf(ios_base:: right, ios_base:: adjustfield), then returns str.

scientific

   ios_base& scientific(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: scientific, ios_base:: floatfield), then returns str.

showbase

   ios_base& showbase(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: showbase), then returns str.

showpoint

   ios_base& showpoint(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: showpoint), then returns str.

showpos

   ios_base& showpos(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: showpos), then returns str.

skipws

   ios_base& skipws(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: skipws), then returns str.

streamoff

   typedef T1 streamoff;

The type is a signed integer type T1 that describes an object that can store a byte offset involved in various stream positioning operations. Its representation has at least 32 value bits. It is not necessarily large enough to represent an arbitrary byte position within a stream. The value streamoff(-1) generally indicates an erroneous offset.

streampos

   typedef fpos<mbstate_t> streampos;

The type is a synonym for fpos< mbstate_t>.

streamsize

   typedef T2 streamsize;

The type is a signed integer type T3 that describes an object that can store a count of the number of elements involved in various stream operations. Its representation has at least 16 bits. It is not necessarily large enough to represent an arbitrary byte position within a stream.

unitbuf

   ios_base& unitbuf(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: unitbuf), then returns str.

uppercase

   ios_base& uppercase(ios_base& str);

The manipulator effectively calls str.setf(ios_base:: uppercase), then returns str.

wios

   typedef basic_ios<wchar_t, char_traits<wchar_t> > wios;

The type is a synonym for template class basic_ios, specialized for elements of type wchar_t with default character traits.

wstreampos

   typedef fpos<mbstate_t> wstreampos;

The type is a synonym for fpos< mbstate_t>.

References

exception(3C++std) , fstream(3C++std) , ios(3C++std) , iostream(3C++std) , istream(3C++std) , locale(3C++std) , ostream(3C++std) , stdio(5) , streambuf(3C++std) , string(3C++std) , wchar(5)