[amibroker] How to tell if a variable is defined?

[Dennis Brown <see3d@xxxxxxxxxxx>]

Hello,

I am building a program in a modular way with #includes.  I would like  
modules to contain all their needed variables included as default  
values, but I would like let the values be pre-defined to override the  
defaults.  I know how to do this with static variables since an  
undefined static variable will return a null or "" depending on the  
type.  However, I wanted to do this with regular variables and I did  
not want to define them all ahead of time (like explicitly assigning  
them null to use the default).  That way I can add functionality to an  
#include file without having to worry about changing all the old  
programs that use it to add the new variables.

For instance using a hypothetical isDefined() function:

myVar1 = myOverrideValue;


// #include starts here:

if( not isDefined( myVar1 ) { myVar1 = DefaultValue1; } // this one is  
overridden
if( not isDefined( myVar2 ) { myVar2 = DefaultValue2; } // this one is  
not

... AFL stuff

// #include ends

I  would appreciate any ideas.

Thanks,
Dennis


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