workaround for closure problem needed

[BCS]

Reply to Jérôme,

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> BCS wrote:
> 
>> OTOH (WARNING: TOTAL HACK) if you want to go one step cheaper; state
>> is 32bits, the same as a void*.
>> 
> Doesn't work on 64 bits platforms!
> 

Actually it should work. You Just get 32bits of junk passed around that is 
ignored. The reverse is the one that wont work (ulong+64bit works but ulong+32bit 
fails)

To be on the safe side the union should have:

static assert((void*).sizeof >= Union.sizeof);

and the other struct should have:

static assert(0 == Struct.sizeof);

> Jerome
> - --
> +------------------------- Jerome M. BERGER ---------------------+
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