I'm not sure that I like this solution (I'm pretty sure I don't), but it works (and I now see that this probably is insufficient for what you want in methods that return objects in different classes): #!/usr/bin/perl
package MyClass;
use strict;
use warnings;
use Want;
sub new {
my $class = shift;
return bless {last_op => ''}, $class;
}
sub this {
my $self = shift;
if (@_) {
$self->{this} = $_[0];
}
if ( my $op = $self->{last_op} ) {
$self->$op($self->{this});
} else {
$self->{curr_value} = $self->{this};
}
return want(qw(SCALAR REF)) ? $self : $self->{curr_value};
}
sub that {
my $self = shift;
if (@_) {
$self->{that} = $_[0];
}
if ( my $op = $self->{last_op} ) {
$self->$op($self->{that});
} else {
$self->{curr_value} = $self->{that};
}
return want(qw(SCALAR REF)) ? $self : $self->{curr_value};
}
sub andand {
my $self = shift;
$self->{last_op} = '_andand';
return $self;
}
sub _andand {
my ($self, $value) = @_;
$self->{last_op} = '';
$self->{curr_value} = $self->{curr_value} && $value;
}
package main;
use strict;
use warnings;
my $foo = MyClass->new();
$foo->this(0);
$foo->that(5);
print "This: ", $foo->this(), "\n";
print "That: ", $foo->that(), "\n";
my $value = $foo->this()->andand->that();
print "V: $value\n";
$value = $foo->that()->andand->this();
print "V: $value\n";
$foo->this(3);
$value = $foo->this()->andand->that();
print "V: $value\n";
$value = $foo->that()->andand->this();
print "V: $value\n";
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