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Index > Compiler Internals > "out of scope" - please, explain...

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IronFelix



Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region
IronFelix
Hi all!
Please explain what does it mean "symbol ... out of scope"? What leads to this message and how to avoid it? Give me please some examples.
Thanks.

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Post 27 Feb 2009, 18:42
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7797
Location: Kraków, Poland
Tomasz Grysztar
This error happens only when you try to forward-reference assembly-time variable (that is, the numerical constant that gets re-defined).

Example of valid forward referencing:
Code:
dd a

a = 1 ; defined just once in code, 
      ; so it's numerical constant and can be forward-referenced    


Example of invalid forward referencing (causing "out of scope" error):
Code:
dd a  ; error happens here 

a = 1

dd a  ; here "a" has value 1

a = 2 ; re-defined, thus it is numerical variable, 
      ; and cannot be forward-referenced

dd a  ; here "a" has value 2    
Post 27 Feb 2009, 22:52
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IronFelix



Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region
IronFelix
Thank you very much, Tomasz. Now it is clear for me what should be done in such case.
Post 28 Feb 2009, 10:47
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