31 Input/output library [input.output]

31.5 Iostreams base classes [iostreams.base]

31.5.4 Class template basic_ios [ios]

31.5.4.2 Constructors [basic.ios.cons]

explicit basic_ios(basic_streambuf<charT, traits>* sb);

Effects: Assigns initial values to its member objects by calling init(sb).

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basic_ios();

Effects: Leaves its member objects uninitialized.

The object shall be initialized by calling basic_ios::init before its first use or before it is destroyed, whichever comes first; otherwise the behavior is undefined.

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~basic_ios();

Remarks: The destructor does not destroy rdbuf().

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void init(basic_streambuf<charT, traits>* sb);

Postconditions: The postconditions of this function are indicated in Table 124 .

Table 124: basic_ios::init() effects [tab:basic.ios.cons]

🔗	Element	Value
🔗	rdbuf()	sb
🔗	tie()	0
🔗	rdstate()	goodbit if sb is not a null pointer, otherwise badbit.
🔗	exceptions()	goodbit
🔗	flags()	skipws \| dec
🔗	width()	0
🔗	precision()	6
🔗	fill()	widen(' ')
🔗	getloc()	a copy of the value returned by locale()
🔗	iarray	a null pointer
🔗	parray	a null pointer