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Re: libstdc++/9424: i/ostream::operator>>/<<(streambuf*) drops characters

Nathan Myers wrote:
...


  __xtrct = __charsread = 0;
  while (true)
    {
      int_type __c = __sbin->sbumpc();
      if (_Traits::eq_int_type(__c ), _Traits_type::eof())
      	break;
      ++__charsread;
      __c = __sbout->sputc(__c);
      if (_Traits::eq_int_type(__c, _Traits_type::eof()))
      	break;


I might be missing some context, so please forgive me if I'm off
base, but wouldn't 27.6.2.5.3, p7, bullet 2 seem to preclude this
implementation since the character must not be extracted if the
insertion fails?

Regards
Martin

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