OpenEuphoria

Re: Re[2]: (Another) (small) Eu 2.5 feature request.

• Posted by Derek Parnell <ddparnell at bigpond.com> Sep 24, 2004
• 482 views

Pete Lomax wrote:

[snip]
> 
> Do you mean slower than eg
> 
> Constant PersonalName=1,
> 		FamilyName=2,
> 		...
> type customer(sequence s)
> 	if length(s)!=5 then return 0 end if
> 	if not sequence(s[PersonalName]) then return 0 end if
> 	...
> end type
> 

Yes, I think it would. 

The 'type' behaviour only slows down access to variables of that
type, but if any variable could be a struct, then every append, concatenate,
assign, etc... would have to do an additional check to handle the
possibility - even if you had not defined any structs.

 
> >In which case, the interpreter would need to add extra checks to
> >append(), prepend(), &, slicing and assignment to make sure it was
> >not changing the target's length, or datatypes. 
> Hmmm. You got me thinking about ways to make some of that illegal in
> the eyes of the compiler...

Yes, a compiler has more opportunity to catch these things before 
execution begins. However you still have to cater for things like ...

 object Temp
 Temp = CurrentCust
 Temp.ZIPCode = 1234

-- 
Derek Parnell
Melbourne, Australia