OpenEuphoria

Re: Reference manual

• Posted by Robert Craig <rds at RapidEuphoria.com> Aug 14, 2001
• 423 views

rforno writes:
<comments on wording of refman.doc>

Thanks. I'll see if I can improve the wording.

> Does turning off type check apply also 
> to predefined types? In such a case,
> does it increase execution speed?

Checks for "sequence" and "integer" are always maintained.
Checks for "atom" won't be performed. This might save
you a bit of time.
User-defined type checks are turned off, but
consider the following:

type color(integer x)
    return x = RED or x = BLUE or x = GREEN
end type

there will still be a simple integer-check 
performed on variables of type color, but
the code inside the type won't be performed.
The same goes for sequence type.

>Assume the following code:
>
> sequence x
> atom a
> x = {1, 2, 3}
> a = 5
> x[2] = a
>
> How much space occupies x[2]?

4 bytes, enough for the integer 5.

> And what if a = 5.0 instead?

a pointer to a single copy of the 8-byte double, 5.0,
will be stored in x[2]. i.e. x[2] and a will both point to 5.0
(plus a 4-byte reference count).

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com