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#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream
 
int main () {
 
  std::stringstream stream("1234");
 
  //stream = std::move(std::stringstream("5678"));
 
  stream.operator=(std::move(std::stringstream("5678")));
 
  //stream.operator=(std::stringstream("5678"));
 
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:11:56: error: use of deleted function ‘std::basic_stringstream<char>& std::basic_stringstream<char>::operator=(const std::basic_stringstream<char>&)’
   stream.operator=(std::move(std::stringstream("5678")));
                                                        ^
In file included from prog.cpp:3:0:
/usr/include/c++/4.8/sstream:502:11: note: ‘std::basic_stringstream<char>& std::basic_stringstream<char>::operator=(const std::basic_stringstream<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_stringstream : public basic_iostream<_CharT, _Traits>
           ^
/usr/include/c++/4.8/sstream:502:11: error: use of deleted function ‘std::basic_iostream<char>& std::basic_iostream<char>::operator=(const std::basic_iostream<char>&)’
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/istream:795:11: note: ‘std::basic_iostream<char>& std::basic_iostream<char>::operator=(const std::basic_iostream<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_iostream
           ^
/usr/include/c++/4.8/istream:795:11: error: use of deleted function ‘std::basic_istream<char>& std::basic_istream<char>::operator=(const std::basic_istream<char>&)’
/usr/include/c++/4.8/istream:58:11: note: ‘std::basic_istream<char>& std::basic_istream<char>::operator=(const std::basic_istream<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_istream : virtual public basic_ios<_CharT, _Traits>
           ^
/usr/include/c++/4.8/istream:58:11: error: use of deleted function ‘std::basic_ios<char>& std::basic_ios<char>::operator=(const std::basic_ios<char>&)’
In file included from /usr/include/c++/4.8/ios:44:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/basic_ios.h:66:11: note: ‘std::basic_ios<char>& std::basic_ios<char>::operator=(const std::basic_ios<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_ios : public ios_base
           ^
In file included from /usr/include/c++/4.8/ios:42:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/ios_base.h:789:5: error: ‘std::ios_base& std::ios_base::operator=(const std::ios_base&)’ is private
     operator=(const ios_base&);
     ^
In file included from /usr/include/c++/4.8/ios:44:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/basic_ios.h:66:11: error: within this context
     class basic_ios : public ios_base
           ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/istream:795:11: error: use of deleted function ‘std::basic_ostream<char>& std::basic_ostream<char>::operator=(const std::basic_ostream<char>&)’
     class basic_iostream
           ^
In file included from /usr/include/c++/4.8/iostream:39:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/ostream:58:11: note: ‘std::basic_ostream<char>& std::basic_ostream<char>::operator=(const std::basic_ostream<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_ostream : virtual public basic_ios<_CharT, _Traits>
           ^
/usr/include/c++/4.8/ostream:58:11: error: use of deleted function ‘std::basic_ios<char>& std::basic_ios<char>::operator=(const std::basic_ios<char>&)’
In file included from prog.cpp:3:0:
/usr/include/c++/4.8/sstream:502:11: error: use of deleted function ‘std::basic_stringbuf<char>& std::basic_stringbuf<char>::operator=(const std::basic_stringbuf<char>&)’
     class basic_stringstream : public basic_iostream<_CharT, _Traits>
           ^
/usr/include/c++/4.8/sstream:64:11: note: ‘std::basic_stringbuf<char>& std::basic_stringbuf<char>::operator=(const std::basic_stringbuf<char>&)’ is implicitly deleted because the default definition would be ill-formed:
     class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
           ^
In file included from /usr/include/c++/4.8/ios:43:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/4.8/streambuf:810:7: error: ‘std::basic_streambuf<_CharT, _Traits>& std::basic_streambuf<_CharT, _Traits>::operator=(const std::basic_streambuf<_CharT, _Traits>&) [with _CharT = char; _Traits = std::char_traits<char>]’ is private
       operator=(const basic_streambuf&) { return *this; };
       ^
In file included from prog.cpp:3:0:
/usr/include/c++/4.8/sstream:64:11: error: within this context
     class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
           ^

Standard output is empty