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.\" ========================================================================
.\"
.IX Title "Tie::Scalar 3"
.TH Tie::Scalar 3 "2012-10-11" "perl v5.12.5" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Tie::Scalar, Tie::StdScalar \- base class definitions for tied scalars
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    package NewScalar;
\&    require Tie::Scalar;
\&
\&    @ISA = qw(Tie::Scalar);
\&
\&    sub FETCH { ... }           # Provide a needed method
\&    sub TIESCALAR { ... }       # Overrides inherited method
\&
\&
\&    package NewStdScalar;
\&    require Tie::Scalar;
\&
\&    @ISA = qw(Tie::StdScalar);
\&
\&    # All methods provided by default, so define only what needs be overridden
\&    sub FETCH { ... }
\&
\&
\&    package main;
\&
\&    tie $new_scalar, \*(AqNewScalar\*(Aq;
\&    tie $new_std_scalar, \*(AqNewStdScalar\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides some skeletal methods for scalar-tying classes. See
perltie for a list of the functions required in tying a scalar to a
package. The basic \fBTie::Scalar\fR package provides a \f(CW\*(C`new\*(C'\fR method, as well
as methods \f(CW\*(C`TIESCALAR\*(C'\fR, \f(CW\*(C`FETCH\*(C'\fR and \f(CW\*(C`STORE\*(C'\fR. The \fBTie::StdScalar\fR
package provides all the methods specified in  perltie. It inherits from
\&\fBTie::Scalar\fR and causes scalars tied to it to behave exactly like the
built-in scalars, allowing for selective overloading of methods. The \f(CW\*(C`new\*(C'\fR
method is provided as a means of grandfathering, for classes that forget to
provide their own \f(CW\*(C`TIESCALAR\*(C'\fR method.
.PP
For developers wishing to write their own tied-scalar classes, the methods
are summarized below. The perltie section not only documents these, but
has sample code as well:
.IP "\s-1TIESCALAR\s0 classname, \s-1LIST\s0" 4
.IX Item "TIESCALAR classname, LIST"
The method invoked by the command \f(CW\*(C`tie $scalar, classname\*(C'\fR. Associates a new
scalar instance with the specified class. \f(CW\*(C`LIST\*(C'\fR would represent additional
arguments (along the lines of AnyDBM_File and compatriots) needed to
complete the association.
.IP "\s-1FETCH\s0 this" 4
.IX Item "FETCH this"
Retrieve the value of the tied scalar referenced by \fIthis\fR.
.IP "\s-1STORE\s0 this, value" 4
.IX Item "STORE this, value"
Store data \fIvalue\fR in the tied scalar referenced by \fIthis\fR.
.IP "\s-1DESTROY\s0 this" 4
.IX Item "DESTROY this"
Free the storage associated with the tied scalar referenced by \fIthis\fR.
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.
.SS "Tie::Scalar vs Tie::StdScalar"
.IX Subsection "Tie::Scalar vs Tie::StdScalar"
\&\f(CW\*(C`Tie::Scalar\*(C'\fR provides all the necessary methods, but one should realize
they do not do anything useful. Calling \f(CW\*(C`Tie::Scalar::FETCH\*(C'\fR or 
\&\f(CW\*(C`Tie::Scalar::STORE\*(C'\fR results in a (trappable) croak. And if you inherit
from \f(CW\*(C`Tie::Scalar\*(C'\fR, you \fImust\fR provide either a \f(CW\*(C`new\*(C'\fR or a
\&\f(CW\*(C`TIESCALAR\*(C'\fR method.
.PP
If you are looking for a class that does everything for you you don't
define yourself, use the \f(CW\*(C`Tie::StdScalar\*(C'\fR class, not the
\&\f(CW\*(C`Tie::Scalar\*(C'\fR one.
.SH "MORE INFORMATION"
.IX Header "MORE INFORMATION"
The perltie section uses a good example of tying scalars by associating
process IDs with priority.


.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	runtime/perl-512
=
Stability	Uncommitted
.TE 
.PP

.SH NOTES

.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.cpan.org/src/5.0/perl-5.12.5.tar.bz2

Further information about this software can be found on the open source community website at http://www.perl.org/.