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Deep vs shallow binding

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Submitted on: 7/29/2000 10:54:31 PM
By: Found on the World Wide Web 
Level: Intermediate
User Rating: By 2 Users
Compatibility:5.0 (all versions), 4.0 (all versions)

Users have accessed this article 2037 times.
 
 
     What's the difference between deep and shallow binding?

 

In deep binding, lexical variables mentioned in anonymous subroutines are the same ones that were in scope when the subroutine was created. In shallow binding, they are whichever variables with the same names happen to be in scope when the subroutine is called. Perl always uses deep binding of lexical variables (i.e., those created with my()). However, dynamic variables (aka global, local, or package variables) are effectively shallowly bound. Consider this just one more reason not to use them.


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