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#include <iostream>
#include <sstream>
#include <fstream>
 
int main()
{
  std::ifstream input("file.txt");
  std::stringstream sstr;
 
  while(input >> sstr);
 
  std::cout << sstr.str() << std::endl;
}

prog.cpp: In function 'int main()':
prog.cpp:10:18: error: cannot bind 'std::basic_istream<char>' lvalue to 'std::basic_istream<char>&&'
   while(input >> sstr);
                  ^
In file included from /usr/include/c++/4.9/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/istream:872:5: note: initializing argument 1 of 'std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::basic_stringstream<char>]'
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^

Standard output is empty