C++ reference: ios

basic_ios
ios
wios
Base class for both input and output streams

iostream library

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Public member functions:

ios members:

(constructor) Construct an object.

operator void * Convert stream to pointer.

operator ! Evaluate stream object.

bad Check if an unrecoverable error has occurred.

clear Set control states.

copyfmt Copy formatting information.

eof Check if End-Of-File has been reached.

exceptions Get/set the exception mask.

fail Check if failure has occurred.

fill Get/set the fill character.

good Check if stream is good for i/o operations.

imbue Imbue locale.

narrow Narrow character.

rdbuf Get/set the associated streambuf object.

rdstate Get control state.

setstate Set control state.

tie Get/set the tied stream.

widen Widen character.

(destructor) No-op [virtual]

members inherited from ios_base:

flags Get/set format flags.

getloc Get current locale.

imbue Imbue locale.

iword Get reference to a long element of the internal extensible array.

precision Get/set floating-point decimal presision.

pword Get reference to a void* element of the internal extensible array.

register_callback Register event callback function.

setf Set some format flags.

sync_with_stdio Activates / Deactivates synchronization with cstdio functions. [static]

unsetf Clear format flag.

width Get/set field width.

xalloc Return a new index for the internal extensible array. [static]

Protected member functions:

ios members:

(constructor) Construct an object

init Initialize internal values

This is a base class for all the hierarchy of stream classes, both input and output classes.
Both the ios class and its parent ios_base class define the members of every stream that are independent of wether the stream object is an input or an output stream. ios_base describes the members that are template-independent while ios describes the members that are template-dependent (i.e. the part that depends on the type of character used by the stream).

The ios class mantains internally the following information of a stream:

fill character: caracter used to pad a field up to the field width. It can be obtained/modified by calling member fill..

pointer to tied stream: pointer to the output stream tied to this object. It can be obtained/modified by calling to tie.

pointer to stream buffer: pointer to the associated streambuf object. It can be obtained/modified by calling to rdbuf.

Standard hierarchy

Public member functions:

Protected member functions:

Description

ios members:
(constructor)	Construct an object.
operator void *	Convert stream to pointer.
operator !	Evaluate stream object.
bad	Check if an unrecoverable error has occurred.
clear	Set control states.
copyfmt	Copy formatting information.
eof	Check if End-Of-File has been reached.
exceptions	Get/set the exception mask.
fail	Check if failure has occurred.
fill	Get/set the fill character.
good	Check if stream is good for i/o operations.
imbue	Imbue locale.
narrow	Narrow character.
rdbuf	Get/set the associated streambuf object.
rdstate	Get control state.
setstate	Set control state.
tie	Get/set the tied stream.
widen	Widen character.
(destructor)	No-op [virtual]
members inherited from ios_base:
flags	Get/set format flags.
getloc	Get current locale.
imbue	Imbue locale.
iword	Get reference to a long element of the internal extensible array.
precision	Get/set floating-point decimal presision.
pword	Get reference to a void* element of the internal extensible array.
register_callback	Register event callback function.
setf	Set some format flags.
sync_with_stdio	Activates / Deactivates synchronization with cstdio functions. [static]
unsetf	Clear format flag.
width	Get/set field width.
xalloc	Return a new index for the internal extensible array. [static]

ios members:
(constructor)	Construct an object
init	Initialize internal values