Teaching swig about arrays of structs within a struct?

I have a swigged struct looking like:

typedef struct { int i; } A;
typedef struct { A *a; } B;   // actually an array of (say) size 5

A *A_alloc();
B *B_alloc();

I can %extend the type B as

%extend B {
    A *get_a(int i) { return self->a[i]; }
}

and (in python) talk about
   b = B_alloc()
   a = b.get_a(2)
to get (in C-speak) b->a[2].

What I haven't figured out how to do is to be able to say
   a = b.a[2]
as this merely subscripts b.a, which it thinks is a string.  Ideas?

This is using swig 1.3.22.  While I'm writing, thanks for the updated
documentation.

                                                                R

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