Tie::Scalar(3) — IRIX 6.5.3f



Tie::Scalar(3)                                                  Tie::Scalar(3)



NAME
     Tie::Scalar, Tie::StdScalar - base class definitions for tied scalars

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';


DESCRIPTION
     This module provides some skeletal methods for scalar-tying classes. See
     the perltie manpage for a list of the functions required in tying a
     scalar to a package. The basic Tie::Scalar package provides a new method,
     as well as methods TIESCALAR, FETCH and STORE. The Tie::StdScalar package
     provides all the methods specified in  the perltie manpage. It inherits
     from Tie::Scalar and causes scalars tied to it to behave exactly like the
     built-in scalars, allowing for selective overloading of methods. The new
     method is provided as a means of grandfathering, for classes that forget
     to provide their own TIESCALAR method.

     For developers wishing to write their own tied-scalar classes, the
     methods are summarized below. The the perltie manpage section not only
     documents these, but has sample code as well:

     TIESCALAR classname, LIST
          The method invoked by the command tie $scalar, classname. Associates
          a new scalar instance with the specified class. LIST would represent
          additional arguments (along the lines of the AnyDBM_File manpage and
          compatriots) needed to complete the association.

     FETCH this
          Retrieve the value of the tied scalar referenced by this.




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Tie::Scalar(3)                                                  Tie::Scalar(3)



     STORE this, value
          Store data value in the tied scalar referenced by this.

     DESTROY this
          Free the storage associated with the tied scalar referenced by 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.

MORE INFORMATION
     The the perltie manpage section uses a good example of tying scalars by
     associating process IDs with priority.











































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