in reply to A "harmless" alternative to 'map{}'?

How about wrapping it in a sub, thusly?

sub new_lamps_for_old (\@) {
    my $old;
    map {
        $old = $_;
        $_ = Lamp->new();
        $old; } @{$_[0]};
}

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The prototype is used to guarantee that the map acts on lvalues.

I have been known to propose placing map in void context when modifying its arguments, just to call attention to the fact. I didn't really mind losing on that proposal.

After Compline,
Zaxo

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Re: Re: A "harmless" alternative to 'map{}'?
by Juerd (Abbot) on Sep 09, 2002 at 06:48 UTC

    The prototype is used to guarantee that the map acts on lvalues.

    No. Prototypes cannot provide any guarantee. 

    - Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

[reply]
      Prototypes cannot provide any guarantee.

      The \@ prototype guarantees barfing if the argument doesn't start with an @, though. And seeing that arrays tend to be lvalues...

      Am I missing anything?

      — Arien

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[d/l]
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        Prototypes can be circumvented using a & and are completely disregarded for object method calls.

        Makeshifts last the longest.

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