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std::basic_ios::basic_ios

From cppreference.com
basic_ios();
(2)
explicit basic_ios( std::basic_streambuf<CharT,Traits>* sb );
(1)

Constructs new basic_ios object.

1) Default constructor. The internal state is not initialized. init() must be called before the first use of the object or before destructor, otherwise the behavior is undefined.

2) Initializes the internal state by calling init(sb). The associated stream buffer is set to sb.

[edit] Parameters

sb - stream buffer to associate to