OpenEuphoria

1. Re: Euphoria Command Query Seperation

• Posted by Michael Nelson <mikestar13 at sbcglobal.net> Sep 21, 2005
• 586 views
• Last edited Sep 22, 2005

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I think open would have to be a procedure in a CQS language and then 
you 
would need another function get the the file_descriptor from the 
filename.    

procedure open(filename,how)
function getfd(filename)

Euphoria has the property of pass by value.  Nothing passed into a 
function is modified to the caller unless it is a global and that is 
what makes Euphoria a beauty.

I think SQL standard has CQS, except for reporting success or failure 
when
executing commands nothing is returned by commands and queries are only
queries.

Shawn Pringle

 

A simpler approach might be to allow procedures (commands) to user pass by
reference (when declared in the procedure definition). So we would have

procedure open(sequence filename,sequence mode, byref integer filenumber)

and our code would look like:

integer fn                                                                      
                                 open("xxx.txt","a",fn)                          
                                                                  if fn=-1 then
-- error handling

 

 

 



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<DIV>
<DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
BORDER-LEFT: #1010ff 2px solid">
<P>posted by: Shawn &lt;pringle at techie.com&gt;<BR><BR>I think open would have
to be a procedure in a CQS language and then <BR>you <BR>would need another
function get the the file_descriptor from the <BR>filename.&nbsp;&nbsp;&nbsp;
<BR><BR>procedure open(filename,how)<BR>function getfd(filename)<BR><BR>Euphoria
has the property of pass by value.&nbsp; Nothing passed into a <BR>function is
modified to the caller unless it is a global and that is <BR>what makes Euphoria
a beauty.<BR><BR>I think SQL standard has CQS, except for reporting success or
failure <BR>when<BR>executing commands nothing is returned by commands and
queries are only<BR>queries.<BR><BR>Shawn Pringle</P>
<P>&nbsp;</P>
<P>A simpler approach might be to allow procedures (commands) to user pass by
reference (when declared in the procedure definition). So we would have </P>
<P>procedure open(sequence filename,sequence mode, byref integer filenumber)</P>
<P>and our code would look like:</P>
<P>integer
fn&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
open("xxx.txt","a",fn)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 if fn=-1 then -- error handling</P>
<P>&nbsp;</P>
<P>&nbsp;</P>
<P>&nbsp;</P></BLOCKQUOTE></DIV></DIV>
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