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Perl and Prolog and Continuations... oh my!

by adrianh (Chancellor)
on Aug 29, 2002 at 03:01 UTC ( #193649=perlmeditation: print w/ replies, xml ) Need Help??

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  1. or download this
    sub foo {
        bar() or die "we failed";
    ...
    };
    
    die "it worked" if foo();
    
  2. or download this
    sub foo {
        my $c = shift;
    ...
    };
    
    foo( sub {die 'it worked'} ) || die "we failed\";
    
  3. or download this
    /* frank and dean are male */
    male(frank).
    ...
    /* frank sang with judy, frank sang with dean */
    sang_with(frank, judy).
    sang_with(frank, dean).
    
  4. or download this
    use Test::More 'no_plan';
    
    ...
    ok(!$v2->bind($v1),            'cannot bind bound var');
    ok( $v1->bind($v2),            'can bind unbound var');
    is( $v1->value, "hello",    '  to correct value');
    
  5. or download this
    use strict;
    use warnings;
    ...
        my $self = shift;
        $$self = \undef;
    };
    
  6. or download this
    sub unify {
        my ($v1, $v2, $continuation) = @_;
    ...
        };
        return(0);
    };
    
  7. or download this
    male(frank).
    male(dean).
    
  8. or download this
    sub male {
        my ($var, $continuation) = @_;
        unify("frank", $var, $continuation);
        unify("dean", $var, $continuation);
    };
    
  9. or download this
    sub male {
        unify("frank", @_);
        unify("dean", @_);
    };
    
  10. or download this
    # print out all the males
    my $a = Var->new;
    ...
    # is dean male
    eval {male("dean", sub {Success->throw})};
    print $@ ? "dean is male" : "dean is not male", "\n";
    
  11. or download this
    
    sub female {
    ...
        my ($var, $continuation) = @_;
        female($var, sub {acts($var, $continuation)});
    };
    
  12. or download this
    # print out all of the actors
    my $c = Var->new;
    ...
    # is ella an actress
    eval {actress("ella", sub {Success->throw})};
    print $@ ? "ella is an actress" : "ella is not an actress", "\n";
    
  13. or download this
    /* frank sang with judy, frank sang with dean */
    sang_with(frank, judy).
    sang_with(frank, dean).
    
  14. or download this
    sub sang_with {
        my ($p1, $p2, $continuation) = @_;    
        unify($p1, 'frank', sub {unify($p2, 'judy', $continuation)});
        unify($p1, 'frank', sub {unify($p2, 'dean', $continuation)});
    };
    
  15. or download this
    sub unify_all {
        my ($a, $b, $continuation) = @_;
    ...
        };
        return(0);
    };
    
  16. or download this
    sub sang_with {
        my ($p1, $p2, $continuation) = @_;
        unify_all(['frank', 'judy'], [$p1, $p2], $continuation);
        unify_all(['frank', 'dean'], [$p1, $p2], $continuation);
    };
    
  17. or download this
    my $x = Var->new;
    eval { 
    ...
        )
    };
    print "frank did sing with an actor\n" if $@;
    
  18. or download this
    my $x = Var->new;
    my $succeed = sub { Success->throw };
    my $sang_with = sub { sang_with("frank", $x, $succeed) };
    eval { actor($x, $sang_with) };
    print "frank did sing with an actor\n" if $@;
    

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