const char_type* operator()(const char_type* __first, const char_type* __last) const { return _M_ctype->scan_is(ctype_base::space, __first, __last); }
const char_type* operator()(const char_type* __first, const char_type* __last) const { __last = find_if(__first, __last, _Eq_char_bound<_Traits>(char_type())); return _M_ctype->scan_is(ctype_base::space, __first, __last); }