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C++ and Java are very similar when it comes to their internal representation and treatment of objects, and so we can comfortably lump the two together when we make a comparison back to Perl Perhaps the most significant difference is that Perl is much more relaxed about its object implementation C++ (and Java) require you to explicitly declare a new class (using the class keyword), and you must explicitly specify a function as separate from a method using the static keyword You must declare your classes separately from their implementations; the class goes in a header file and the implementation in a separate file, except in the case of inline definitions C++ also requires you to specify the privacy of a method, object, or class explicitly There is no such feature within Perl; if you need to protect the privacy of a method or function, don t advertise it If you want to protect a variable, then use a lexically scoped one instead We can also get away with using a constructor with any name we don t have to create a constructor with the same name as the class we are creating Although we typically use new in Perl, this is a convention, rather than a restriction Finally, because C++ (and indeed Java) are compiled languages, the class information (that is the definition, supported methods, inheritance, etc) must be known at compile time Perl allows the definition of everything at run time We can even modify the inheritance hierarchy by making modifications to the @ISA array, while simultaneously making changes to the methods and even format dynamically

Within Perl (versions 5 and up) you can tie a variable type to a particular class The class implements the core methods that create, access, update, and destroy the elements of the underlying data type they are tied to You can tie a scalar, array, or hash to any external data source The most obvious use is for DBM files, which are hash-based database files we ll see more of them in 13 You can tie a hash to an external DBM file (which uses a hashing system to store data in a physical file) and then use the normal hash constructs to access the keys and values within the external file

n Demonstrate your basic understanding of how common classes work n Demonstrate your ability to use the API

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that are required and those that are optional Table 6-1 shows some examples taken from the perlsub man page In the last three examples in Table 6-1, Perl treats the declarations slightly differently The mygrep function is passed as a true list operator, interpreting the following arguments as elements of a list and not as further arguments to the original mygrep function The myrand function behaves like a true unary operator, and the mytime function is treated as a function with no arguments at all This means you can get away with statements like

and you ll end up with the return value of mytime added to the static value, instead of Perl calling mytime with an argument of +2

sub mylink ($$) sub myvec ($$$) sub myindex ($$;$) sub mysyswrite ($$$;$) sub myreverse (@) sub myjoin ($@) sub mypop (\@) sub mysplice (\@$$@) sub mykeys (\%) sub myopen (*;$) sub mypipe (**) sub mygrep (&@) sub myrand ($) sub mytime () Table 6-1

For example, let s say that a year from now you have to use the Date and Calendar classes The exam creation team will be happy if you say to yourself: I don t remember exactly how to do this stuff, but I do remember that some of these classes use factory methods, and that there s something tricky about Locales being immutable

mylink $old, $new myvec $var, $offset, 1 myindex &getstring, "substr" mysyswrite $buf, 0, length($buf) - $off, myreverse $a, $b, $c myjoin ":", $a, $b, $c mypop @array mysplice @array, @array, 0, @pushme mykeys %{$hashref} myopen HANDLE, $name mypipe READHANDLE, WRITEHANDLE mygrep { /foo/ } $a, $b, $c myrand 42 mytime

6:

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