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Showing content from https://en.cppreference.com/w/cpp/language/../io/basic_stringbuf/../ios_base/../basic_ios/init.html below:

std::basic_ios<CharT,Traits>::init - cppreference.com

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

The postconditions are as follows:

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.

[edit] Parameters sb - stream buffer to associate to [edit] See also

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