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Another interesting case of extending a parent object is writing the parent object such that it extends itself in order to reflect the circumstances under which it was created There is no particular reason why a constructor cannot create an object of a different class from the one it is in or the one passed to it If we define an @ISA array for a newly invented class (which we can do simply by assigning it with a fully qualified package name), we can also have this new class inherit its methods from another class This gives us the possibility of creating different versions of a parent class for different occasions.

For example, a common approach taken by other object-oriented languages is to represent errors as objects (generically known as exception objects) rather than as raw numbers or some other basic data type, so errors can be handled in a more object-oriented style without relying on an arbitrary system error value While Perl does not support such a concept natively, we can create an error object class that supports various different methods for handling errors We can then subclass this class on the fly when a new type of error occurs By choosing this approach, we need not create subclasses for every error type, and we automatically support any new errors that may arise without needing to change our code.

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The following example demonstrates an object class that translates system errors, as communicated by the special variable $! (or $ERRNO, if using the English module), into objects whose class is based on the common name for the error, ENOENT for error number 2, for example Each object class is created on the fly if it does not exist, and an @ISA array is placed into it to subclass it from the class name passed to the constructor (which is either the parent class itself or something that inherits from it, either way, the methods of our class can be called from the new subclass) The key parts of the module are the new constructor and the _error_from_errno subroutine: # ErrorClasspm package ErrorClass; use strict; use Errno; no strict 'refs'; my %errcache;.

DefaultFieldNameList#" hint="The field names to be selected by the query"> <cfargument name="OrderBy" type="string" required="no" default="#variablesDefaultOrderBy#" hint="The sort order of the query"> <cfset var GetbyFilter =""> <cfquery name="GetbyFilter" datasource="#variablesdatasource#"> SELECT #argumentsFieldNameList# FROM #variablesTableName# WHERE #argumentsFilter# ORDER BY #argumentsOrderBy# </cfquery> <cfreturn GetbyFilter> </cffunction> There are all kinds of issues with this code Some are simple For example, this will break if the Filter or OrderBy arguments are of zero length Others are more profound For instance, the query doesn t have any cfqueryparam tags, so the important associated security and performance benefits are lost However, this is just a simple example, so please bear with me First, notice that all of the arguments are optional So, if we just wanted to get a default field list with any default filters in the default order for (say) a product, we would call ProductDAOgetbyFilter().

sub new { my ($class, $error) = @_; $class = (ref $class) || $class; $error = $error || $!; # construct the subclass name my $subclass = $class. '::'. _error_from_errno($error); # cause subclass to inherit from us unless (@{$subclass. '::ISA'}) { @{$subclass. '::ISA'} = qw(ErrorClass); } # return reference to error, blessed into subclass return bless \$error, $subclass; } # return the integer value of the error sub number { my $self = shift; return int($$self); } # return the message of the error sub message { my $self = shift; return ''.$$self; } # accessor/mutator sub error { my ($self, $error) = @_; if (defined $error) { my $old = $$self; $$self = $error; return $old; } return $$self; } # subroutine to find the name of an error number sub _error_from_errno { my $errno = int(shift); # do we already know this one by name if (defined $errcache{$errno}) { return $errcache{$errno}; } # otherwise, search for it in the export list my ($name, $number); foreach $name (@Errno::EXPORT_OK) { $number = Errno->$name; $errcache{$number} = $name; return $name if $errno == $number; }

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