Re: Accessing Constant Hashes


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Re: Accessing Constant Hashes

by perrin (Chancellor)

on Jan 16, 2002 at 02:36 UTC ( [id://139066]=note: print w/replies, xml )

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in reply to Accessing Constant Hashes

ar0n gave the right answer, but I just want to take a moment to say that constant in the current implementation is totally lame for exactly this reason, and I think you should avoid it completely. It doesn't work in quoted strings or HERE docs either without similar tricks. Just use globals or lexicals at the top of the file for your constants.

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(lestrrat) Re(2): Accessing Constant Hashes
by lestrrat (Deacon) on Jan 16, 2002 at 02:46 UTC

I personally would recommend using a constant if there's a possibility of constant folding:

    #!/usr/local/bin/perl
    use O qw/ Deparse /;
    use constant CONDITION => 0;
    if( CONDITION ) {
        print "condition true\n";
    } else {
        print "condition false\n";
    }

    __END__
    ## and here's the output. notice that there are
    ## no if's
    me@myhost> ./test.pl
    ./test.pl syntax OK
    sub CONDITION () {
        package constant;
        $scalar;
    }
    print "condition false\n";;
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Otherwise I guess I could care less, but I use it more for a mental note than anything else -- it makes me aware that this value should be a constant

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