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Naveg

Sat Mar 12, 2005 12:52 pm


* before identifier

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I've seen a * used before an identifier before while reading other people's code. like...var *person:string. What does this do?


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Delos

Sat Mar 12, 2005 4:15 pm



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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:


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.


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Naveg

Sat Mar 12, 2005 4:36 pm



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that only happens if you export?


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Delos

Sun Mar 13, 2005 12:42 am



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Not the exporting part...add the line 

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...