http://www.perlmonks.org?node_id=196893


in reply to Dynamic operators

Eval is probably the way to go with this, as others have shown. For extra style points, make it into an anonymous sub so as to ensure that the overhead of eval only happens once:

sub makeop {
  my $op = shift;
  return eval 'sub {$_[0] '.$op.' $_[1]}';
}

my $x = 42;
my $y = 50;
my $op = makeop(">=");
if ($op->($x, $y)) {
  ...
}

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perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'

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Re: Re: Dynamic operators
by John M. Dlugosz (Monsignor) on Sep 11, 2002 at 18:43 UTC
    Didn't I read that in Perl6, all the built-in operators could have references taken to them? So, you would not need to make your own closure, but would use some new syntax to refer to the one that exists. However, you might still need an eval to do that, if there is no "symbolic ref" way to look up the builtin.

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