Re: generic imports? void* -> generics?

[chris <spamoff.danx@ntlworld.com>]

Matthew Heaney wrote:

> There's no binding to C type void* in Interfaces.C, but type
> System.Address should work OK.  That way you can say:

That was what I was going to do (did that in the past), but I wondered 
if there was a safer way.  I might go with it as it's simple enough to 
implement.


> This is wrong, because your Ada function to_userdata returns an object,
> not a pointer to object, as the C function does.  You need to bind to an
> access type, like this:

I changed it to use an access type in the spec, but the problem was the 
compiler rejected any attempt in the spec to specify the convention of a 
generic type.


>    function To_Userdata
>      (L : lua_state_access;
>       Pos : Index) return Userdata is
> 

snip

>       Result : constant Userdata_Access :=
>          lua_touserdata(L, Pos);
>    begin
>       return Result.all;
>    end;

Never thought of that, thanks.


Thanks,
Chris