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Re: Perl oddities

by BrowserUk (Pope)
on Mar 02, 2005 at 08:41 UTC ( #435725=note: print w/ replies, xml ) Need Help??


in reply to Perl oddities

My other "love to hate" oddity of Perl 5 is lvalue subs. To quote me:

As they are, the only thing that can be done with the assigned value is ... well, to assign it to something. Sure, you can decide what to assign it to using the values past via the normal @_ mechanism to make the determination, but there is absolutely no way to inspect the value of the assign value either before you assign it nor after is was assigned. That means it is impossible to perform any verification on the assigned value. This may work for things like substr and splice, that simply don't care what is assigned, but it makes using lvaue subs for any other purpose pretty much useless. I note that vec can and does inspect the value assigned in that it will reject non-numerical assignments as it has to process them in order to use them. This is exactly the facility I would like to use.

I'd really like to see lvalue subs made useful:(


Examine what is said, not who speaks.
Silence betokens consent.
Love the truth but pardon error.


Comment on Re: Perl oddities
Re^2: Perl oddities
by theorbtwo (Prior) on Mar 02, 2005 at 12:25 UTC

    lvalue subs will be useful, but only with a lot of ugly syntax. I hope that macros and attributes will be powerful enough to fix this, and suspect that they will be, though it still jars me that I'll need to depend on the module that has the macros in it.


    Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).

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