Computer Science Canada

* before identifier
Author:  Naveg [ Sat Mar 12, 2005 12:52 pm ]
Post subject:  * before identifier
I've seen a * used before an identifier before while reading other people's code. like...var *person:string. What does this do?
Author:  Delos [ Sat Mar 12, 2005 4:15 pm ]
Post subject: 
The * is the short form for "pervasive". This means that the variable is...umm..universal, and needn't be imported into an modules or other such containers within a proggie.

Try it:

code:

var superVar : string := "Muwahahaha"

module test

export main

proc main
put superVar
end main
end test

test.main



Try run that. It crashes. Now add a "*" infront of 'superVar'. Run again. Magic.
This becomes more useful when you need to programme things that get really complicated and require a large number of classes and modules and other such object-type thingies.
Author:  Naveg [ Sat Mar 12, 2005 4:36 pm ]
Post subject: 
that only happens if you export?
Author:  Delos [ Sun Mar 13, 2005 12:42 am ]
Post subject: 
Not the exporting part...add the line
code:

import superVar


to the beginning of the module and leave the variable as non-pervasive. There you go...manual importation of req'd vars. Once again, the uses may not seem apparent...

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