[Bug libstdc++/50501] Insertion of complex into a stream may fail without invalidating the stream

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50501

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-23 23:58:54 UTC ---
The Standard is very precise here, and nothing changed for C++11. It says,
literally:

Effects: inserts the complex number x onto the stream o as if it were
implemented as follows:

template<class T, class charT, class traits>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& o, const complex<T>& x) {
  basic_ostringstream<charT, traits> s;
  s.flags(o.flags());
  s.imbue(o.getloc());
  s.precision(o.precision());
  s << ’(’ << x.real() << "," << x.imag() << ’)’;
  return o << s.str();
}

thus, I don't see how we could to something else, like what you are suggesting,
and remain conforming.