[ новости /+++ | форум | теги | ]

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.

     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.









Поиск по тексту MAN-ов: 


























Партнёры:










Хостинг:










Закладки на сайте

Проследить за страницей


Created 1996-2024 by Maxim Chirkov

Добавить, Поддержать, Вебмастеру