Swig Problem string&

[lubiao]

Hi

 I have created a simple function called  'addTheString(string& str,
string appstr)' and the intension
 is to append the 'appstr' to 'str' and use 'str'.

 I tried swigging this method. My swigtest.i file is okay as I think
I have added both
    - stl.i at top
    - std_string.i

  However, I am running into the problem. I get error messages as follows

  -- error --
 TypeError: argument number 1: a 'std::string&' is expected,
  -- end error --