Call by reference in SWIG?

[Nok]

I can't get call-by-reference functions to work in SWIG...

Even when wrapping a trivial example like this:

/* File : trivial.i */
%module trivial
%inline
%{
  class test
  {
  public:
    void foo(int *t)
    {
      *t=42;
    }
  };
%}

I get a TypeError when trying to use it:

import trivial

x=10
c=trivial.test()
c.foo(x)

The error is:

    def foo(*args): return _trivial.test_foo(*args)
TypeError: in method 'test_foo', argument 2 of type 'int &'