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Skips white space in the stream.
template class<Elem, Tr>
basic_istream<Elem, Tr>& ws(
basic_istream<Elem, Tr>& _Istr
The manipulator extracts and discards any elements ch for which use_facet< ctype<Elem> >(getloc). is(ctype<Elem>::space, ch) is true.
The function calls setstate(eofbit) if it encounters end of file while extracting elements. It returns _Istr.