class

std::ios_base

class ios_base;

Base class for streams

ios_base
basic_ios

Base class for the entire hierarchy of stream classes in the standard input/output library, describing the most basic part of a stream which is common to all stream objects, independently of their character type.

It has no public constructors, and thus no objects of this class can be declared.

Both ios_base and its derived class basic_ios define the components of streams that do not depend on whether the stream is an input or an output stream: ios_base describes the members that are independent of the template parameters (i.e. the character type and traits), while basic_ios describes the members that do depend on them.

More specifically, the ios_base class maintains the following information of a stream:

field	member functions	description
Formatting	format flags	`flags` `setf` `unsetf`	A set of internal flags that affect how certain input/output operations are interpreted or generated. See member type `fmtflags` .
	field width	`width`	Width of the next formatted element to insert.
	display precision	`precision`	Decimal precision for the next floating-point value inserted.
	locale	`getloc` `imbue`	The `locale` object used by the function for formatted input/output operations affected by localization properties.
Other	callback stack	`register_callback`	Stack of pointers to functions that are called when certain events occur.
Other	extensible arrays	`iword` `pword` `xalloc`	Internal arrays to store objects of type `long` and `void*`.

Member Functions

(constructor): Construct object (public member function)

(destructor): Destruct object (public member function)

Formatting:

flags: Get/set format flags (public member function)

setf: Set specific format flags (public member function)

unsetf: Clear specific format flags (public member function)

precision: Get/Set floating-point decimal precision (public member function)

width: Get/set field width (public member function)

Locales:

imbue: Imbue locale (public member function)

getloc: Get current locale (public member function)

Internal extensible array:

xalloc: Get new index for extensible array [static] (public static member function)

iword: Get integer element of extensible array (public member function)

pword: Get pointer element of extensible array (public member function)

Others:

register_callback: Register event callback function (public member function)

sync_with_stdio: Toggle synchronization with cstdio streams [static] (public static member function)

Member types

event: Type to indicate event type (public member type)

event_callback: Event callback function type (public member type)

fmtflags: Type for stream format flags (public member type)

iostate: Type for stream state flags (public member type)

openmode: Type for stream opening mode flags (public member type)

seekdir: Type for stream seeking direction flag (public member type)

Member classes

failure: Base class for stream exceptions (public member class)

Init: Initialize standard stream objects (public member class)

Member constants

Streams have member constants with the possible values for member types fmtflags , iostate , openmode and seekdir (see the description of each type for more info).

types

manipulators

other functions

member functions

member types

std::ios_base

Member Functions

Member types

Member classes

Member constants