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basic_ios::copyfmt
basic_ios& copyfmt(const basic_ios& rhs);
The member function reports the callback eventerase_event. It then copies the fill character, the tie pointer, and the formatting information from rhs into *this. Before altering the exception mask, it reports the callback event copyfmt_event. If, after the copy is complete, state & exceptions() is nonzero, the function effectively calls clear with the argument rdstate(). It returns *this.