[Dev-C++] String << operator overloaded (using template)

[David M. <ci...@ya...>]

Could someone tell me why the following code does not work?
 
//Allows the use of << on any data type that has it defined
//into  a string.
template <class in_type>
std::string& operator<< (std::string& output, in_type& data)
{
  std::stringstream ss;
  ss << data;
  ss >> output;
  return output;
}


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