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Since writing destructors for object classes in multiple-inheritance scenarios can be more than a little tricky, the NEXT module again comes to our rescue with simplified semantics to make the job a little easier. Essentially we have two strategies: use NEXT in each DESTROY block to redispatch the method search to the next block in line, or rename all DESTROY blocks into ordinary methods and use EVERY in the top-level superclass to call them all. In both cases, the destructors will be called in the correct order, first-to-last and youngest-to-oldest. Here is how we would rewrite the previous example with NEXT: sub DESTROY { $self = shift;

...destroy our own resources... $self->NEXT::DESTROY(); } Of course, for this to work, all the inherited classes involved must each invoke NEXT::DESTROY or the chain will be broken. The alternative is to create a superclass with a universal destructor in it and have it call all destructor subroutines, now renamed to something else such as destroy: #!/usr/bin/perl # everydestructor.pl use strict; use warnings; { package Ancestor; use NEXT; sub new { return bless {}, ref($_[0]) || $_[0]; } sub DESTROY { print "We'll all"; shift->EVERY::destroy(); } sub destroy { print " we go\n"; } package Parent; our @ISA=qw(Ancestor); sub destroy { print " when"; } package Child; our @ISA=qw(Parent); sub destroy { print " go together"; } } my $object=new Child; When the program terminates, it will print (as its dying action) We ll all go together when we go. This shows that the DESTROY method of Ancestor is called first, then the destroy methods in the correct youngest-to-oldest order, finishing with the Ancestor s own destroy method. Notice that unlike the NEXT-based approach, only the Ancestor package needs access to the functionality of the NEXT module here.

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So far we have looked at objects from the point of view of methods. We can get quite a long way like this, but sometimes it becomes desirable to be able to treat objects as if they were conventional data types. For instance, if we have an object class, which can in some sense be added or concatenated with another object of the same type, we would like to be able to say $object1 += $object2; Or, rather than presuming we have an add method for the purpose: $object1->add($object2); Unfortunately, we cannot add objects or easily apply any other operator to them, because they are at heart just references, and they obey the same rules that normal references do. Furthermore, objects represent opaque values, so we should not even be able to express the idea of adding them it is nonsensical. Instead, we need to redefine the + operator (and by inference, the += operator) in such a way that the object s class can provide the implementation for us.

We also discussed deploying smart device applications, including the OTA, MSI, and sneakernet approaches. Often, you need to use a variety of deployment approaches. For example, you may need to use sneakernet for the initial deployment, and then use OTA for updates. Finally, we introduced some of the up-and-coming features in Visual Studio 2005. In the next chapter, we ll discuss a feature that is common to all of the various types of smart clients: offline support.

Now, go ahead and run the simulator again. Our fancy new icon and more user-friendly name will be displayed on the home screen, just like in Figure 2-33!

This redefinition of standard operators for objects is known as operator overloading, and Perl supports it through the overload module Presuming that we have an add method for a given object class, we can assign it to the + operator so that when an object of our class is added to anything, it is called to perform the actual addition instead of the default + operator supplied by Perl Here is an example of an object class that handles addition and addition assignment operations: # addition.

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