Declaring a variable is just as much fooling around with the symbol table just as much as using a sub declaration and AUTOLOAD (which is to say, not very much).
But using AUTOLOAD without sub declarations in a situation where there is inheritance going on is indeed foolish. | [reply] |
I find that a strange attitude. Symbol tables are essentially, hashes. And subs/methods are essentially a hash-based dispatch table. And it seems to me that dispatch tables have recently been lauded here.
Come to that, you could consider inheritance, mixins, importing symbols, localising globals all as "fooling with the symbol table.
Equally, plenty of people post to Perlmonks the first (and second and third...) time they use regex, or references and many other Perl techniques and constructs. Should we avoid all of these because they are sometimes difficult to get to grips with at first?
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The difference between all of those is that mucking about with the symbol table has special significance to the interpreter. Of course, this is why we do it. But, I would argue that greater care and thought needs to be put into symbol-table mucking than, say, your own hash-based dispatch table. You have a greater capacity to introduce subtle bugs that you would with a dispatch table, mixins, and the like.
Now, inheritance, symbol importation, mixins, and localising globals are different in my mind because there is an interface for doing this. The code behind the interface is tested, so you're not building it from scratch. Remember the lesson of Netscape.
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