OpenEuphoria

Re: type checking ?

• Posted by Bernie Ryan <xotron at bl?efro?.com> Nov 21, 2007
• 633 views

Matt Lewis wrote:
> 
> > }}}
<eucode>
> > constant
> >   MySEQ = {1,2,3,4,5,6,7,8,9}
> > 
> > procedure useit(sequence seq_name)
> >   -- do stuff.
> > end procedure
> > 
> > -- The user can enter this which is WRONG
> > useit("MySEQ")
> > 
> > -- Or the user can enter this is CORRECT
> > useit(MySEQ)
> > 
> > -- NOTE they are both sequences so procedure will accept either.
> > 
> > </eucode>
{{{

> 
> Unfortunately, this hasn't cleared it up for me.  I guess that I have a
> couple of responses.  If the passed value is incorrect, then you can
> simply validate it using equal().  Also, if the only correct value is a
> specific constant, then why pass it as a parameter at all?  That seems
> to be just increasing typing for no benefit.
> 
> I suspect that there's something more to this that you haven't made clear
> yet.  What is the effect of one being WRONG and the other CORRECT?
> 
> What about (in the above example):
> }}}
<eucode>
>     useit({1,2,3,4,5,6,7,8,9})
> </eucode>
{{{


Matt:

The useit() procedure will try to process the sequence weather it is

a constant name sequence or the actual constant sequence because they

depending how the user calls the procedure.

I do not know in advance what the constant sequence will be because it is

added by the user via include file. 

Of course if user passes the name as a sequence the procedure will crash. 

I will just have to spell it out in the users manual and

HOPE that they read it. 

Bernie

My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API 

Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan