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package Tie::Scalar;
=head1 NAME
Tie::Scalar, Tie::StdScalar - base class definitions for tied scalars
=head1 SYNOPSIS
package NewScalar;
require Tie::Scalar;
@ISA = (Tie::Scalar);
sub FETCH { ... } # Provide a needed method
sub TIESCALAR { ... } # Overrides inherited method
package NewStdScalar;
require Tie::Scalar;
@ISA = (Tie::StdScalar);
# All methods provided by default, so define only what needs be overridden
sub FETCH { ... }
package main;
tie $new_scalar, 'NewScalar';
tie $new_std_scalar, 'NewStdScalar';
=head1 DESCRIPTION
This module provides some skeletal methods for scalar-tying classes. See
L<perltie> for a list of the functions required in tying a scalar to a
package. The basic B<Tie::Scalar> package provides a C<new> method, as well
as methods C<TIESCALAR>, C<FETCH> and C<STORE>. The B<Tie::StdScalar>
package provides all the methods specified in L<perltie>. It inherits from
B<Tie::Scalar> and causes scalars tied to it to behave exactly like the
built-in scalars, allowing for selective overloading of methods. The C<new>
method is provided as a means of grandfathering, for classes that forget to
provide their own C<TIESCALAR> method.
For developers wishing to write their own tied-scalar classes, the methods
are summarized below. The L<perltie> section not only documents these, but
has sample code as well:
=over
=item TIESCALAR classname, LIST
The method invoked by the command C<tie $scalar, classname>. Associates a new
scalar instance with the specified class. C<LIST> would represent additional
arguments (along the lines of L<AnyDBM_File> and compatriots) needed to
complete the association.
=item FETCH this
Retrieve the value of the tied scalar referenced by I<this>.
=item STORE this, value
Store data I<value> in the tied scalar referenced by I<this>.
=item DESTROY this
Free the storage associated with the tied scalar referenced by I<this>.
This is rarely needed, as Perl manages its memory quite well. But the
option exists, should a class wish to perform specific actions upon the
destruction of an instance.
=back
=head1 MORE INFORMATION
The L<perltie> section uses a good example of tying scalars by associating
process IDs with priority.
=cut
use Carp;
sub new {
my $pkg = shift;
$pkg->TIESCALAR(@_);
}
# "Grandfather" the new, a la Tie::Hash
sub TIESCALAR {
my $pkg = shift;
if (defined &{"{$pkg}::new"}) {
carp "WARNING: calling ${pkg}->new since ${pkg}->TIESCALAR is missing"
if $^W;
$pkg->new(@_);
}
else {
croak "$pkg doesn't define a TIESCALAR method";
}
}
sub FETCH {
my $pkg = ref $_[0];
croak "$pkg doesn't define a FETCH method";
}
sub STORE {
my $pkg = ref $_[0];
croak "$pkg doesn't define a STORE method";
}
#
# The Tie::StdScalar package provides scalars that behave exactly like
# Perl's built-in scalars. Good base to inherit from, if you're only going to
# tweak a small bit.
#
package Tie::StdScalar;
@ISA = (Tie::Scalar);
sub TIESCALAR {
my $class = shift;
my $instance = shift || undef;
return bless \$instance => $class;
}
sub FETCH {
return ${$_[0]};
}
sub STORE {
${$_[0]} = $_[1];
}
sub DESTROY {
undef ${$_[0]};
}
1;
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