Hello rootcho,

I hadn’t used the assertions module before, but playing around with it, in light of the advice in the 2007 thread how to use attributes?, I came up with this:

#! perl
use strict;
use warnings;
use Attribute::Handlers;

sub assertion : ATTR{'CODE'};

no  warnings;
sub assert(&) : assertion { &{$_[0]}() }
use warnings;

use assertions 'foo';
assert { print "asserting 'foo'\n" };

{
    use assertions qw( foo bar );
    assert { print "asserting 'foo' and 'bar'\n" };
}

{
    use assertions qw( bar );
    assert { print "asserting only 'bar'\n" };
}

{
    use assertions '_ && bar';
    assert { print "asserting 'foo' && 'bar'\n" };
}

assert { print "asserting 'foo' again\n" };

[download]

Output:

22:14 >perl 783_SoPW.pl
asserting 'foo'
asserting 'foo' and 'bar'
asserting only 'bar'
asserting 'foo' && 'bar'
asserting 'foo' again

22:17 >

[download]

Whether the optimisation also works as desired, I haven’t tested, but this should at least give you a basis for further experimentation.

Hope it helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: assertions ? how do they work.. by Athanasius
in thread assertions ? how do they work.. by rootcho

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