How to test for existance ?

From: no spam (uce_at_ftc.gov)
Date: 02/13/05

  • Next message: Mark: "Newbie: test array for lower case" 
    Date: Sun, 13 Feb 2005 01:21:43 GMT

    Here's a small script to show what I am trying to do:
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    #!/usr/bin/perl -w

    sub print_yep
      {
      print "yep...\n";
      }

    $function1 = "print_yep";
    $function2 = "rubbish";

    $vector->{ACTION1} = \&$function1;
    $vector->{ACTION2} = \&$function2;

    print "something's fishy !\n" if (! exists $vector->{ACTION2});

    $vector->{ACTION1}();
    $vector->{ACTION2}();

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    How can I test if a function exist or not ?
    Shouldn't this print "something's fishy" ??
    I've tried to use defined, to deference in different ways, but I can't get
    it working.

    Thanks,

    Yves. 

    ----
Yves Dorfsman
                                         http://www.cuug.ab.ca/dorfsmay
                                         http://www.SollerS.ca
  • Next message: Mark: "Newbie: test array for lower case"

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