Visualize variable length structure?

Hi, any ideas how to write a natvis for a variable length structure?

We have the following setup:

struct Foo
{
  u32 mask; // each bit set corresponds to a void*
  /* void* data[ bitcount(mask) ]; */
};
Now, the complications ...

The data is packed - that is, if the bit is unset, there is no void* for it. Thus a mask of 6=(2,4) corresponds to data={data2, data4}, not data={null_data1, data2, data4}. A __bitcount intrinsic would be super handy here.

The type of data depends on the mask bit. Thus it could be an integer, float, pointer of any type etc. I expect some kind of "eval" would be needed to find the type, depending on the mask to display it correctly.

Any ideas?

Stephen.