IF ASSIGNED(X) ELSE X=" (OpenInsight 32-Bit) [Revelation On-Line Wiki]

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{{tag>category:"OpenInsight 32-Bit" author:"Martin Drenovac" author:"Bob Carten" author:"dbakke@srpcs.com's Don Bakke"}}

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==== IF ASSIGNED(X) ELSE X=" (OpenInsight 32-Bit) ====
=== At 16 OCT 2008 11:02:23PM Martin Drenovac wrote: ===
 
 
<QUOTE>
I saw Mike demo an auto commuter module generator last Wed in Sydney, and he had code along the lines of 



   If assigned(script) Else script='

   If assigned(format) Else format='



Whilst not the world's greatest OI developer, we've moved to this, which is quicker and IMHO neater:



check_assignments(script, format)





where the code for check_assignments is:



SUBROUTINE CHECK_ASSIGNMENTS(P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13)

/*        */

        

If Assigned(P1) else P1="

If Assigned(P2) else P2="

If Assigned(P3) else P3="

If Assigned(P4) else P4="

If Assigned(P5) else P5="

If Assigned(P6) else P6="

If Assigned(P7) else P7="

If Assigned(P8) else P8="

If Assigned(P9) else P9="

If Assigned(P10) else P10="

If Assigned(P11) else P11="

If Assigned(P12) else P12="

If Assigned(P13) else P13="



RETURN



Makes it so simple to code, cut/paste your module signature and stick the call to check_assignments in front:





Cheers




</QUOTE>
----

=== At 17 OCT 2008 08:16AM Bob Carten wrote:  ===

<QUOTE>

Hi Martin



Nice work.

It illustrates out the power of a consistent interface.

When all commuter modules have the same calling convention you can make helper functions, implement a form of inheritance and have dynamic substition of functions, e.g.



function specific_commuter(ctrlEntId, method, Param1, Param2, ...)

 ...

retval='

begin case

   case method=local_method"

        GoSub local_branch

   case method1,'_'=SPECIAL'

        funcname=method:'_HELPER'

        retval=function(@funcname(ctrlEntId, method, Param1,Param2, ...)

   case otherwise$

        retval=base_commuter((ctrlEntId, method, Param1,Param2, ...)

end case



if get_Status(err) then 

   ....

end



return retval



When passing parameters I have started to use two approaches:



When it is acceptable to change the parameter (pass by reference)

I use



   If Assigned(Param1) else Param1="



When it is not acceptable to change the parameter (pass by value)

I use



   p1=if assigned(Param1) then Param1 else ''



Inside the program I treat Param1 as off limits and only P1.

If I need return through a parameter I deliberately set Param1, e.g.



transfer P1 to Param1





- Bob

</QUOTE>

----

=== At 17 OCT 2008 08:38AM Martin Drenovac wrote:  ===

<QUOTE>Cheers Bob - I'm just getting to understand your Promoted Events and working on just this approach of yours in my code.



Thanks for your continuing sample code...

</QUOTE>

----

=== At 17 OCT 2008 09:16AM dbakke@srpcs.com's Don Bakke wrote:  ===

<QUOTE>We tend to put the same type of functionality into an insert so the top portion of our code contains this:


<code>
$insert [/color]EVENT_SETUP[/color][/color][/size]         
               
</code>




Then in addition to any common declares, our insert contains this:


<code>
Compile insert [/color]EVENT_SETUP 
[/color] 
[/color]// Make sure any event parameters which have not been assigned are nulled. 
[/color]If [/color]Assigned(CtrlEntId)          [/color]else [/color]CtrlEntId=[/color]"" 
[/color]If [/color]Assigned(Event)              [/color]else [/color]Event=[/color]"" 
[/color]If [/color]Assigned(Param1)             [/color]else [/color]Param1=[/color]"" 
[/color]If [/color]Assigned(Param2)             [/color]else [/color]Param2=[/color]"" 
[/color]If [/color]Assigned(Param3)             [/color]else [/color]Param3=[/color]"" 
[/color]If [/color]Assigned(Param4)             [/color]else [/color]Param4=[/color]"" 
[/color]If [/color]Assigned(Param5)             [/color]else [/color]Param5=[/color]"" 
[/color]If [/color]Assigned(Param6)             [/color]else [/color]Param6=[/color]"" 
[/color]If [/color]Assigned(Param7)             [/color]else [/color]Param7=[/color]"" 
[/color]If [/color]Assigned(Param8)             [/color]else [/color]Param8=[/color]"" 
[/color]If [/color]Assigned(Param9)             [/color]else [/color]Param9=[/color]"" 
[/color]If [/color]Assigned(Param10)            else [/color]Param10=[/color]"" 
[/color]If [/color]Assigned(Param11)            [/color]else [/color]Param11=[/color]"" 
[/color]If [/color]Assigned(Param12)            [/color]else [/color]Param12=[/color]"" 
[/color]If [/color]Assigned(Param13)            [/color]else [/color]Param13=[/color]"" 
[/color]If [/color]Assigned(Param14)            [/color]else [/color]Param14=[/color]"" 
[/color]If [/color]Assigned(Param15)            [/color]else [/color]Param15=[/color]""[/color][/color][/size]         
               
</code>




dbakke@srpcs.com

[url=http://www.srpcs.com]SRP Computer Solutions, Inc.[/url]



[img]http://www.srpcs.com/srpicon1.gif[/img]

</QUOTE>


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