Library writing - delegates or fp's?

[BCS]

Chad J wrote:
> So I have decided to roll my own GUI library, one dedicated to computer 
> games.  But I've run into a bit of an unpleasant design problem - for 
> handling callbacks, how should my library expose function pointers and 
> delegates?
> 
[...]

a while back someone found out that you can take a delegate and replace 
the internal function pointer with a regular function pointer and it 
still works just fine. Given this, you could wright a little 
function*-to-delegate function and let people do this


UseThisCallback(int delegate(int));

int delegate(int) f2d(int function(int) fnp){...}


int fn(int);

void main()
{
	UseThisCallback(f2d(&fn));
}


I known this is an *ugly* hack, OTOH maybe Walter can be convinced to 
add a function-pointer to delegate cast that does this in a consistent 
manner.

cast(int delegate(int))&fn