Called by basic_ios constructors.
void init(
    basic_streambuf<Elem,Traits> *_Sb,
    bool _Isstd = false
);
Parameters
- _Sb 
 Standard buffer to store input or output elements.
- _Isstd 
 Specifies whether this is a standard stream.
Remarks
The member function stores values in all member objects, so that:
- rdbuf returns _Sb. 
- tie returns a null pointer. 
- rdstate returns goodbit if _Sb is nonzero; otherwise, it returns badbit. 
- exceptions returns goodbit. 
- width returns 0. 
- precision returns 6. 
- fill returns the space character. 
- getloc returns locale::classic. 
- iword returns zero, and pword returns a null pointer for all argument values. 
Requirements
Header: <ios>
Namespace: std