Templates: Checking if template instance exists 1998-09-08 -- Brian Staff Newsgroups: topspeed.products.c4
> I am writing a Procedure Estension template. This template call a
> function at %ProgramSetup. However, when I include this template in
> more than one procedure, it generates that function call for each
> procedure it is included in. I only need the function called once
> regardless of the number of procedures that include this extension
> template.
>
> How can the above be done?
#DECLARE(%FirstInstance)
#DECLARE(%LastInstance)
#DECLARE(%ThisTemplate)
#SET(%ThisTemplate,%ActiveTemplate)
#!do NOT put the UNIQUE attribute on the following DECLARE - it will cause
the ADD to sort
#DECLARE(%AllInstances),MULTI
#FOR(%ActiveTemplate),WHERE(%ActiveTemplate=%ThisTemplate)
#FOR(%ActiveTemplateInstance)
#ADD(%AllInstances,%ActiveTemplateInstance)
#ENDFOR
#ENDFOR
#SELECT(%AllInstances,1)
#IF(%AllInstances=%ActiveTemplateInstance)
#SET(%FirstInstance,1)
#ELSE
#SET(%FirstInstance,0)
#ENDIF
#SELECT(%AllInstances,ITEMS(%AllInstances))
#IF(%AllInstances=%ActiveTemplateInstance)
#SET(%LastInstance,1)
#ELSE
#SET(%LastInstance,0)
#ENDIF
#AT(%GlobalData)
#IF(%FirstInstance)
Myvariable LONG
#ENDIF
#ENDAT
This technique also allows you to build complex structures like:
#IF(%FirstInstance)
CASE MyVariable
#ENDIF
OF Whatever !one for every instance
DO Something
#IF(%LastInstance)
END
#ENDIF
HTH
Brian Staff (Phoenix) - Team TopSpeed [CW]
http://ourworld.compuserve.com/homepages/BrianStaff/
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