---
name: "std::ios_base"
section: "3cxx"
platform: "linux"
package: "libstdc++-12-doc"
version: "12.4.0-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/std::ios_base/3cxx"
---

# std::ios\_base(3cxx)

The base of the I/O class hierarchy.

## NAME

std::ios\_base - The base of the I/O class hierarchy.

## SYNOPSIS

`#include <ios>`

Inherited by **std::basic\_ios\< char, \_Traits \>**, **std::basic\_ios\< \_CharT, char\_traits\< \_CharT \> \>**, and **std::basic\_ios\< \_CharT, \_Traits \>**.

### Classes

class **failure**\
 These are thrown to indicate problems with io.

### Public Types

enum **event** { **erase\_event**, **imbue\_event**, **copyfmt\_event** }\
 The set of events that may be passed to an event callback.  **typedef** **void**(\* **event\_callback**) (**event** \_\_e, **ios\_base** &\_\_b, int \_\_i)\
 The type of an event callback function.  **typedef** \_Ios\_Fmtflags **fmtflags**\
 This is a bitmask type.  **typedef** \_Ios\_Iostate **iostate**\
 This is a bitmask type.  **typedef** \_Ios\_Openmode **openmode**\
 This is a bitmask type.  **typedef** \_Ios\_Seekdir **seekdir**\
 This is an enumerated type.

### Public Member Functions

**ios\_base** (const **ios\_base** &)=**delete**\
 **virtual** **~ios\_base** ()\
 const **locale** & **\_M\_getloc** () const\
 Locale access.  **fmtflags** **flags** () const\
 Access to format flags.  **fmtflags** **flags** (**fmtflags** **\_\_fmtfl**)\
 Setting new format flags all at once.  **locale** **getloc** () const\
 Locale access.  **locale** **imbue** (const **locale** &**\_\_loc**)  **throw** ()\
 Setting a new locale.  long & **iword** (int **\_\_ix**)\
 Access to integer array.  **ios\_base** & **operator=** (const **ios\_base** &)=**delete**\
 **streamsize** **precision** () const\
 Flags access.  **streamsize** **precision** (**streamsize** **\_\_prec**)\
 Changing flags.  **void** \*& **pword** (int **\_\_ix**)\
 Access to void pointer array.  **void** **register\_callback** (**event\_callback** **\_\_fn**, int \_\_index)\
 Add the callback \_\_fn with parameter \_\_index.  **fmtflags** **setf** (**fmtflags** **\_\_fmtfl**)\
 Setting new format flags.  **fmtflags** **setf** (**fmtflags** **\_\_fmtfl**, **fmtflags** \_\_mask)\
 Setting new format flags.  **void** **unsetf** (**fmtflags** \_\_mask)\
 Clearing format flags.  **streamsize** **width** () const\
 Flags access.  **streamsize** **width** (**streamsize** **\_\_wide**)\
 Changing flags.

### Static Public Member Functions

**static** bool **sync\_with\_stdio** (bool **\_\_sync**=**true**)\
 Interaction with the standard C I/O objects.  **static** int **xalloc** ()  **throw** ()\
 Access to unique indices.

### Static Public Attributes

**static** const **openmode** **\_\_noreplace**\
 **static** const **fmtflags** **adjustfield**\
 A mask of left\|right\|internal. Useful for the 2-arg form of `setf`.  **static** const **openmode** **app**\
 Seek to end before each write.  **static** const **openmode** **ate**\
 Open and seek to end immediately after opening.  **static** const **iostate** **badbit**\
 Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file).  **static** const **fmtflags** **basefield**\
 A mask of dec\|oct\|hex. Useful for the 2-arg form of `setf`.  **static** const **seekdir** **beg**\
 Request a seek relative to the beginning of the stream.  **static** const **openmode** **binary**\
 Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.  **static** const **fmtflags** **boolalpha**\
 Insert/extract `bool` in alphabetic rather than numeric format.  **static** const **seekdir** **cur**\
 Request a seek relative to the current position within the sequence.  **static** const **fmtflags** **dec**\
 Converts integer input or generates integer output in decimal base.  **static** const **seekdir** **end**\
 Request a seek relative to the current end of the sequence.  **static** const **iostate** **eofbit**\
 Indicates that an input operation reached the end of an input sequence.  **static** const **iostate** **failbit**\
 Indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.  **static** const **fmtflags** **fixed**\
 Generate floating-point output in fixed-point notation.  **static** const **fmtflags** **floatfield**\
 A mask of scientific\|fixed. Useful for the 2-arg form of `setf`.  **static** const **iostate** **goodbit**\
 Indicates all is well.  **static** const **fmtflags** **hex**\
 Converts integer input or generates integer output in hexadecimal base.  **static** const **openmode** **in**\
 Open for input. Default for `ifstream` and fstream.  **static** const **fmtflags** **internal**\
 Adds fill characters at a designated internal point in certain generated output, or identical to `right` if no such point is designated.  **static** const **fmtflags** **left**\
 Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.)  **static** const **fmtflags** **oct**\
 Converts integer input or generates integer output in octal base.  **static** const **openmode** **out**\
 Open for output. Default for `ofstream` and fstream.  **static** const **fmtflags** **right**\
 Adds fill characters on the left (initial positions) of certain generated output. (I.e., the thing you print is flush right.)  **static** const **fmtflags** **scientific**\
 Generates floating-point output in scientific notation.  **static** const **fmtflags** **showbase**\
 Generates a prefix indicating the numeric base of generated integer output.  **static** const **fmtflags** **showpoint**\
 Generates a decimal-point character unconditionally in generated floating-point output.  **static** const **fmtflags** **showpos**\
 Generates a + sign in non-negative generated numeric output.  **static** const **fmtflags** **skipws**\
 Skips leading white space before certain input operations.  **static** const **openmode** **trunc**\
 Truncate an existing stream when opening. Default for `ofstream`.  **static** const **fmtflags** **unitbuf**\
 Flushes output after each output operation.  **static** const **fmtflags** **uppercase**\
 Replaces certain lowercase letters with their uppercase equivalents in generated output.

### Protected Types

enum { **\_S\_local\_word\_size** }\

### Protected Member Functions

**void** **\_M\_call\_callbacks** (**event** **\_\_ev**)  **throw** ()\
 **void** **\_M\_dispose\_callbacks** (**void**)  **throw** ()\
 \_Words & **\_M\_grow\_words** (int \_\_index, bool **\_\_iword**)\
 **void** **\_M\_init** ()  **throw** ()\
 **void** **\_M\_move** (**ios\_base** &) noexcept\
 **void** **\_M\_swap** (**ios\_base** &**\_\_rhs**) noexcept\

### Protected Attributes

\_Callback\_list \* **\_M\_callbacks**\
 **iostate** **\_M\_exception**\
 **fmtflags** **\_M\_flags**\
 **locale** **\_M\_ios\_locale**\
 \_Words **\_M\_local\_word** \[\_S\_local\_word\_size\]\
 **streamsize** **\_M\_precision**\
 **iostate** **\_M\_streambuf\_state**\
 **streamsize** **\_M\_width**\
 \_Words \* **\_M\_word**\
 int **\_M\_word\_size**\
 \_Words **\_M\_word\_zero**\

## Detailed Description

The base of the I/O class hierarchy.

This class defines everything that can be defined about I/O that does not depend on the type of characters being input or output. Most people will only see `ios_base` when they need to specify the full name of the various I/O flags (e.g., the openmodes).

## Member Typedef Documentation

### typedef void(\* std::ios\_base::event\_callback) (event \_\_e, ios\_base &\_\_b, int \_\_i)

The type of an event callback function.

**Parameters**

*\_\_e* One of the members of the event enum. \
 *\_\_b* Reference to the ios\_base object. \
 *\_\_i* The integer provided when the callback was registered.

Event callbacks are user defined functions that get called during several ios\_base and basic\_ios functions, specifically imbue(), copyfmt(), and ~ios().

### typedef \_Ios\_Fmtflags std::ios\_base::fmtflags

This is a bitmask type. *\_Ios\_Fmtflags*` is` *implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type fmtflags are:*

- •

  *boolalpha*

- •

  *dec*

- •

  *fixed*

- •

  *hex*

- •

  *internal*

- •

  *left*

- •

  *oct*

- •

  *right*

- •

  *scientific*

- •

  *showbase*

- •

  *showpoint*

- •

  *showpos*

- •

  *skipws*

- •

  *unitbuf*

- •

  *uppercase*

- •

  *adjustfield*

- •

  *basefield*

- •

  *floatfield*

### typedef \_Ios\_Iostate std::ios\_base::iostate

*This is a bitmask type. \_Ios\_Iostate*` is` *implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type iostate are:*

- •

  *badbit*

- •

  *eofbit*

- •

  *failbit*

- •

  *goodbit*

### typedef \_Ios\_Openmode std::ios\_base::openmode

*This is a bitmask type. \_Ios\_Openmode*` is` *implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type openmode are:*

- •

  *app*

- •

  *ate*

- •

  *binary*

- •

  *in*

- •

  *out*

- •

  *trunc*

### typedef \_Ios\_Seekdir std::ios\_base::seekdir

*This is an enumerated type. \_Ios\_Seekdir*` is` *implementation-defined. Defined values of type seekdir are:*

- •

  *beg*

- •

  *cur, equivalent to* `SEEK_CUR` *in the C standard library.*

- •

  *end, equivalent to* `SEEK_END` *in the C standard library.*

## Member Enumeration Documentation

### enum std::ios\_base::event

*The set of events that may be passed to an event callback. erase\_event is used during ~ios() and copyfmt(). imbue\_event is used during imbue(). copyfmt\_event is used during copyfmt().*

## Constructor & Destructor Documentation

### virtual std::ios\_base::~ios\_base ()` [virtual]`

*Invokes each callback with erase\_event. Destroys local storage.*

*Note that the ios\_base object for the standard streams never gets destroyed. As a result, any callbacks registered with the standard streams will not get invoked with erase\_event (unless copyfmt is used).*

## Member Function Documentation

### const locale & std::ios\_base::\_M\_getloc () const` [inline]`

*Locale access.*

**Returns**

*A reference to the current locale.*

*Like getloc above, but returns a reference instead of generating a copy.*

### fmtflags std::ios\_base::flags () const` [inline]`

*Access to format flags.*

**Returns**

*The format control flags for both input and output.*

### fmtflags std::ios\_base::flags (fmtflags \_\_fmtfl)` [inline]`

*Setting new format flags all at once.*

**Parameters**

*\_\_fmtfl The new flags to set.*

**Returns**

*The previous format control flags.*

*This function overwrites all the format flags with \_\_fmtfl.*

### locale std::ios\_base::getloc () const` [inline]`

*Locale access.*

**Returns**

*A copy of the current locale.*

*If* `imbue(loc)` *has previously been called, then this function returns* `loc`*. Otherwise, it returns a copy of* `std::locale()`*, the global C++ locale.*

### locale std::ios\_base::imbue (const locale & \_\_loc)

*Setting a new locale.*

**Parameters**

*\_\_loc The new locale.*

**Returns**

*The previous locale.*

*Sets the new locale for this stream, and then invokes each callback with imbue\_event.*

*Referenced by* **std::basic\_ios\< \_CharT, \_Traits \>::imbue()***.*

### long & std::ios\_base::iword (int \_\_ix)` [inline]`

*Access to integer array.*

**Parameters**

*\_\_ix Index into the array.*

**Returns**

*A reference to an integer associated with the index.*

*The iword function provides access to an array of integers that can be used for any purpose. The array grows as required to hold the supplied index. All integers in the array are initialized to 0.*

*The implementation reserves several indices. You should use xalloc to obtain an index that is safe to use. Also note that since the array can grow dynamically, it is not safe to hold onto the reference.*

### streamsize std::ios\_base::precision () const` [inline]`

*Flags access.*

**Returns**

*The precision to generate on certain output operations.*

*Be careful if you try to give a definition of precision here; see DR 189.*

### streamsize std::ios\_base::precision (streamsize \_\_prec)` [inline]`

*Changing flags.*

**Parameters**

*\_\_prec The new precision value.*

**Returns**

*The previous value of precision().*

### void \*& std::ios\_base::pword (int \_\_ix)` [inline]`

*Access to void pointer array.*

**Parameters**

*\_\_ix Index into the array.*

**Returns**

*A reference to a void\* associated with the index.*

*The pword function provides access to an array of pointers that can be used for any purpose. The array grows as required to hold the supplied index. All pointers in the array are initialized to 0.*

*The implementation reserves several indices. You should use xalloc to obtain an index that is safe to use. Also note that since the array can grow dynamically, it is not safe to hold onto the reference.*

### void std::ios\_base::register\_callback (event\_callback \_\_fn, int \_\_index)

*Add the callback \_\_fn with parameter \_\_index.*

**Parameters**

*\_\_fn The function to add.* \
 *\_\_index The integer to pass to the function when invoked.*

*Registers a function as an event callback with an integer parameter to be passed to the function when invoked. Multiple copies of the function are allowed. If there are multiple callbacks, they are invoked in the order they were registered.*

### fmtflags std::ios\_base::setf (fmtflags \_\_fmtfl)` [inline]`

*Setting new format flags.*

**Parameters**

*\_\_fmtfl Additional flags to set.*

**Returns**

*The previous format control flags.*

*This function sets additional flags in format control. Flags that were previously set remain set.*

### fmtflags std::ios\_base::setf (fmtflags \_\_fmtfl, fmtflags \_\_mask)` [inline]`

*Setting new format flags.*

**Parameters**

*\_\_fmtfl Additional flags to set.* \
 *\_\_mask The flags mask for fmtfl.*

**Returns**

*The previous format control flags.*

*This function clears mask in the format flags, then sets fmtfl* `&` *mask. An example mask is* `ios_base::adjustfield`*.*

### static bool std::ios\_base::sync\_with\_stdio (bool \_\_sync = true)` [static]`

*Interaction with the standard C I/O objects.*

**Parameters**

*\_\_sync Whether to synchronize or not.*

**Returns**

*True if the standard streams were previously synchronized.*

*The synchronization referred to is only that between the standard C facilities (e.g., stdout) and the standard C++ objects (e.g., cout). User-declared streams are unaffected. See https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary*

### void std::ios\_base::unsetf (fmtflags \_\_mask)` [inline]`

*Clearing format flags.*

**Parameters**

*\_\_mask The flags to unset.*

*This function clears \_\_mask in the format flags.*

### streamsize std::ios\_base::width () const` [inline]`

*Flags access.*

**Returns**

*The minimum field width to generate on output operations.*

*Minimum field width refers to the number of characters.*

### streamsize std::ios\_base::width (streamsize \_\_wide)` [inline]`

*Changing flags.*

**Parameters**

*\_\_wide The new width value.*

**Returns**

*The previous value of width().*

### static int std::ios\_base::xalloc ()` [static]`

*Access to unique indices.*

**Returns**

*An integer different from all previous calls.*

*This function returns a unique integer every time it is called. It can be used for any purpose, but is primarily intended to be a unique index for the iword and pword functions. The expectation is that an application calls xalloc in order to obtain an index in the iword and pword arrays that can be used without fear of conflict.*

*The implementation maintains a static variable that is incremented and returned on each invocation. xalloc is guaranteed to return an index that is safe to use in the iword and pword arrays.*

## Member Data Documentation

### const fmtflags std::ios\_base::adjustfield` [static]`

*A mask of left\|right\|internal. Useful for the 2-arg form of* `setf`*.*

*Referenced by* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***,* **std::internal()***,* **std::left()***, and* **std::right()***.*

### const openmode std::ios\_base::app` [static]`

*Seek to end before each write.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::overflow()***, and* **std::basic\_filebuf\< \_CharT, \_Traits \>::xsputn()***.*

### const openmode std::ios\_base::ate` [static]`

*Open and seek to end immediately after opening.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::open()***.*

### const iostate std::ios\_base::badbit` [static]`

*Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file).*

*Referenced by* **std::basic\_istream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::basic\_ios\< \_CharT, \_Traits \>::bad()***,* **std::basic\_ios\< \_CharT, \_Traits \>::fail()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::flush()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::basic\_istream\< char \>::get()***,* **std::basic\_ostream\< char, \_Traits \>::operator\<\<()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::operator\<\<()***,* **std::basic\_ostream\< char, \_Traits \>::operator\<\<()***,* **std::operator\>\>()***,* **std::basic\_istream\< char \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::peek()***,* **std::basic\_istream\< char \>::peek()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::put()***,* **std::basic\_istream\< \_CharT, \_Traits \>::putback()***,* **std::basic\_istream\< \_CharT, \_Traits \>::read()***,* **std::basic\_istream\< \_CharT, \_Traits \>::readsome()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::sync()***,* **std::basic\_istream\< \_CharT, \_Traits \>::tellg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::unget()***, and* **std::ws()***.*

### const fmtflags std::ios\_base::basefield` [static]`

*A mask of dec\|oct\|hex. Useful for the 2-arg form of* `setf`*.*

*Referenced by* **std::dec()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***,* **std::hex()***, and* **std::oct()***.*

### const seekdir std::ios\_base::beg` [static]`

*Request a seek relative to the beginning of the stream.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::seekpos()***.*

### const openmode std::ios\_base::binary` [static]`

*Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::showmanyc()***.*

### const fmtflags std::ios\_base::boolalpha` [static]`

*Insert/extract* `bool` *in alphabetic rather than numeric format.*

*Referenced by* **std::boolalpha()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***, and* **std::noboolalpha()***.*

### const seekdir std::ios\_base::cur` [static]`

*Request a seek relative to the current position within the sequence.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::imbue()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::overflow()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::pbackfail()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::seekoff()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekoff()***,* **std::basic\_istream\< \_CharT, \_Traits \>::tellg()***, and* **std::basic\_ostream\< \_CharT, \_Traits \>::tellp()***.*

### const fmtflags std::ios\_base::dec` [static]`

*Converts integer input or generates integer output in decimal base.*

*Referenced by* **std::dec()***.*

### const seekdir std::ios\_base::end` [static]`

*Request a seek relative to the current end of the sequence.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::open()***, and* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekoff()***.*

### const iostate std::ios\_base::eofbit` [static]`

*Indicates that an input operation reached the end of an input sequence.*

*Referenced by* **std::basic\_istream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_date()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_monthname()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_time()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_weekday()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_year()***,* **std::basic\_ios\< \_CharT, \_Traits \>::eof()***,* **std::basic\_istream\< char \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::time\_get\< \_CharT, \_InIter \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::peek()***,* **std::basic\_istream\< \_CharT, \_Traits \>::putback()***,* **std::basic\_istream\< \_CharT, \_Traits \>::read()***,* **std::basic\_istream\< \_CharT, \_Traits \>::readsome()***,* **std::basic\_istream\< char \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::unget()***, and* **std::ws()***.*

### const iostate std::ios\_base::failbit` [static]`

*Indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.*

*Referenced by* **std::basic\_istream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_monthname()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_weekday()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_year()***,* **std::basic\_ios\< \_CharT, \_Traits \>::fail()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::time\_get\< \_CharT, \_InIter \>::get()***,* **std::basic\_istream\< char \>::ignore()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::operator\>\>()***,* **std::basic\_istream\< char \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::read()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::seekp()***, and* **std::basic\_ostream\< \_CharT, \_Traits \>::seekp()***.*

### const fmtflags std::ios\_base::fixed` [static]`

*Generate floating-point output in fixed-point notation.*

*Referenced by* **std::fixed()***, and* **std::hexfloat()***.*

### const fmtflags std::ios\_base::floatfield` [static]`

*A mask of scientific\|fixed. Useful for the 2-arg form of* `setf`*.*

*Referenced by* **std::defaultfloat()***,* **std::fixed()***,* **std::hexfloat()***, and* **std::scientific()***.*

### const iostate std::ios\_base::goodbit` [static]`

*Indicates all is well.*

*Referenced by* **std::basic\_istream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_monthname()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_weekday()***,* **std::time\_get\< \_CharT, \_InIter \>::do\_get\_year()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::flush()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::get()***,* **std::time\_get\< \_CharT, \_InIter \>::get()***,* **std::basic\_istream\< \_CharT, \_Traits \>::getline()***,* **std::basic\_istream\< \_CharT, \_Traits \>::ignore()***,* **std::basic\_istream\< \_CharT, \_Traits \>::ignore()***,* **std::basic\_istream\< \_CharT, \_Traits \>::ignore()***,* **std::basic\_ostream\< char, \_Traits \>::operator\<\<()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::operator\<\<()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::operator\>\>()***,* **std::basic\_istream\< char \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::operator\>\>()***,* **std::basic\_istream\< \_CharT, \_Traits \>::peek()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::put()***,* **std::basic\_istream\< \_CharT, \_Traits \>::putback()***,* **std::basic\_istream\< \_CharT, \_Traits \>::read()***,* **std::basic\_istream\< \_CharT, \_Traits \>::readsome()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::sync()***,* **std::basic\_istream\< \_CharT, \_Traits \>::unget()***, and* **std::ws()***.*

### const fmtflags std::ios\_base::hex` [static]`

*Converts integer input or generates integer output in hexadecimal base.*

*Referenced by* **std::num\_get\< \_CharT, \_InIter \>::do\_get()***,* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***, and* **std::hex()***.*

### const openmode std::ios\_base::in` [static]`

*Open for input. Default for* `ifstream` *and fstream.*

*Referenced by* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::overflow()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::pbackfail()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_istream\< \_CharT, \_Traits \>::seekg()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekoff()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekpos()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::showmanyc()***,* **std::basic\_istream\< \_CharT, \_Traits \>::tellg()***,* **std::basic\_filebuf\< \_CharT, \_Traits \>::underflow()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::underflow()***, and* **std::basic\_filebuf\< \_CharT, \_Traits \>::xsgetn()***.*

### const fmtflags std::ios\_base::internal` [static]`

*Adds fill characters at a designated internal point in certain generated output, or identical to* `right` *if no such point is designated.*

*Referenced by* **std::internal()***.*

### const fmtflags std::ios\_base::left` [static]`

*Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.)*

*Referenced by* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***, and* **std::left()***.*

### const fmtflags std::ios\_base::oct` [static]`

*Converts integer input or generates integer output in octal base.*

*Referenced by* **std::oct()***.*

### const openmode std::ios\_base::out` [static]`

*Open for output. Default for* `ofstream` *and fstream.*

*Referenced by* **std::basic\_filebuf\< \_CharT, \_Traits \>::overflow()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::overflow()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::pbackfail()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekoff()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::seekp()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::seekp()***,* **std::basic\_stringbuf\< \_CharT, \_Traits, \_Alloc \>::seekpos()***,* **std::basic\_ostream\< \_CharT, \_Traits \>::tellp()***, and* **std::basic\_filebuf\< \_CharT, \_Traits \>::xsputn()***.*

### const fmtflags std::ios\_base::right` [static]`

*Adds fill characters on the left (initial positions) of certain generated output. (I.e., the thing you print is flush right.)*

*Referenced by* **std::right()***.*

### const fmtflags std::ios\_base::scientific` [static]`

*Generates floating-point output in scientific notation.*

*Referenced by* **std::hexfloat()***, and* **std::scientific()***.*

### const fmtflags std::ios\_base::showbase` [static]`

*Generates a prefix indicating the numeric base of generated integer output.*

*Referenced by* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***,* **std::noshowbase()***, and* **std::showbase()***.*

### const fmtflags std::ios\_base::showpoint` [static]`

*Generates a decimal-point character unconditionally in generated floating-point output.*

*Referenced by* **std::noshowpoint()***, and* **std::showpoint()***.*

### const fmtflags std::ios\_base::showpos` [static]`

*Generates a + sign in non-negative generated numeric output.*

*Referenced by* **std::noshowpos()***, and* **std::showpos()***.*

### const fmtflags std::ios\_base::skipws` [static]`

*Skips leading white space before certain input operations.*

*Referenced by* **std::basic\_istream\< \_CharT, \_Traits \>::sentry::sentry()***,* **std::noskipws()***,* **std::\_\_detail::operator\>\>()***, and* **std::skipws()***.*

### const openmode std::ios\_base::trunc` [static]`

*Truncate an existing stream when opening. Default for* `ofstream`*.*

### const fmtflags std::ios\_base::unitbuf` [static]`

*Flushes output after each output operation.*

*Referenced by* **std::nounitbuf()***, and* **std::unitbuf()***.*

### const fmtflags std::ios\_base::uppercase` [static]`

*Replaces certain lowercase letters with their uppercase equivalents in generated output.*

*Referenced by* **std::num\_put\< \_CharT, \_OutIter \>::do\_put()***,* **std::nouppercase()***, and* **std::uppercase()***.*

## Author

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