2006/10/16, Duncan Murdoch <[EMAIL PROTECTED]>:
> As Gabor said, the third way is to give no default, but test missing()
> in the code.
I forgot this one, thank you. In my case it is probably not suited as
I just pass the arguments to a C (Pascal) function and do the checking
there.
[explanations snipped]
> So generally my advice would be:
> - Be consistent with similar existing functions.
> - Choose what you think will be convenient in current and predicted
> future versions of your function.
Ok, thank you. - Until now I always used NA but will (apart from your
advice) prefer NULL from now on. In C (Pascal) code NULL is also
easier to check than NA*
Thanks again and best regards,
Hans-Peter Suter
--
*
function riIsNull( _s: pSExp ): aRBoolean; cdecl;
vs.
function IsNaScalar( _x: pSExp ): boolean;
begin
result:= (riLength( _x ) = 1) and
(riTypeOf( _x ) in [setLglSxp, setRealSxp]) and
(rIsNa( riReal( riCoerceVector( _x, setRealSxp ) )[0] ) <> 0);
end;
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