# std::basic_ios<CharT,Traits>::init

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< cpp‎ | io‎ | basic ios

protected: void init( std::basic_streambuf<CharT,Traits>* sb ); |  |

Sets the associated stream buffer to sb and initializes the internal state.

The postconditions are as follows:

Element | Value
--- | ---
rdbuf() | sb
tie() | null pointer
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 std::locale()

This member function is protected: it is called by the constructors of the derived stream classes std::basic_istream and std::basic_ostream once the associated stream buffer is known. Until this function is called, every member function (including the destructor) of the default-constructed std::basic_ios invokes undefined behavior. Note that `basic_ios` is a virtual base class, and therefore its constructor is not called by the constructors of those directly derived classes, which is why two-stage initialization is necessary.

### Parameters

sb | - | stream buffer to associate to

### See also

(constructor) | constructs the object (public member function)

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