C++ Library - <basic_ios>

---

Introduction

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.

Definition

Below is definition of basic_ios as shown below −

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

Parameters

Parameters of basic_ios should be like this −

• parameters − Character type.

• traits − Character traits class that defines essential properties of the characters used by stream objects (see char_traits).

Member types

Sr.No.	Member types	Definition
1	event	Type to indicate event type
2	event_callback	Event callback function type
3	failure	Base class for stream exceptions
4	fmtflags	Type for stream format flags
5	Init	Initialize standard stream objects
6	iostate	Type for stream state flags
7	openmode	Type for stream opening mode flags
8	seekdir	Type for stream seeking direction flag

Public Member Functions

Sr.No.	Member types	Definition
1	(constructor)	Construct object (public member function )
2	(destructor)	Destruct object (public member function )

State flag functions

Sr.No.	Member types	Definition
1	good	It is used to check whether state of stream is good
2	eof	It is used to check whether eofbit is set
3	fail	It is used to check whether either failbit or badbit is set
4	bad	It is used to check whether badbit is set
5	operator!	Evaluate stream
6	rdstate	It is used to get error state flags
7	setstate	It is used to set error state flag
8	clear	It is used to set error state flag

Formatting

Sr.No.	Member types	Definition
1	copyfmt	Copy formatting information
2	fill	Get/set fill character

Others

Sr.No.	Member types	Definition
1	exceptions	It is used to get/set exceptions mask
2	imbue	Imbue locale
3	tie	It is used to get/set tied stream
4	rdbuf	It is used to get/set stream buffer
5	narrow	Narrow character
6	widen	Widen character

Protected member functions

Sr.No.	Member types	Definition
1	init	Initialize object
2	move	Move internals
3	swap	Swap internals
4	set_rdbuf	It is used to set stream buffer