---
name: "Text::Bidi::Array"
section: "3pm"
platform: "linux"
package: "libtext-bidi-perl"
version: "2.18-1+b3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Text::Bidi::Array"
---

# Text::Bidi::Array(3pm)

Base class for dual life arrays

## NAME

Text::Bidi::Array - Base class for dual life arrays

## VERSION

version 2.18

## SYNOPSIS

```
    use Text::Bidi::Array::Byte;
    my $a = new Text::Bidi::Array::Byte "abc";
    say $a->[1]; # says 98
    say $$a; # says abc
    say "$a"; # also says abc
```

## DESCRIPTION

This is an abstract base class for objects that function as \`\`dual-life''  arrays: When viewed as an array reference, it functions as a usual array of  numbers. When used as a scalar reference, it returns the same array as a  packed string. The packing specification depends on the sub-class. These  classes are used in Text::Bidi to conveniently pass arrays to the  underlying fribidi library, but could be of independent interest.

## OVERLOADED OPERATORS

An object of this type can be dereferenced either as a scalar or as an array.   In the first case, it returns the packed (string) representation of the  array. In the second, it returns the unpacked array of numbers.

The packed representation is also returned when the object is used as a  string.

## CONSTRUCTION

```
    $a = new Text::Bidi::Array::<Type> $data
```

Create a new array of the given **Type**, and initialise it with *$data*.   *$data* can be either a string, which the new object then view as an array  of the given type, or an array reference (more precisely, anything that can  be dereferenced as an array), which is then packed according to the rules of  **Type**. If no *$data* is given, it defaults to 0.

## SEE ALSO

Text::Bidi::Array::Byte, Text::Bidi::Array::Long

## FOR IMPLEMENTORS

The rest of this documentation is for writing specific derived classes. The  object is represented internally as a hashref. To implement a particular  instance, the following methods should be implemented.  Each of these should  manipulate the field `"data"`, which is the string that stores the actual  value. Unimplemented methods will lead to croaking. See  Text::Bidi::Array::Byte and Text::Bidi::Array::Long for examples.

- $self-\>pack(@data)

  Convert (pack) an array of numbers into a string according to the format of  the current class (this will probably be a class method). Returns the string.

The following methods should behave as described in Tie::Array.

- $self-\>STORE($index, $value)

  Store the *$value* in the part of `"$self->{'data'}"` corresponding to  *$index*.

- $self-\>FETCH($index)

  Fetch the value at *$index* from the correct part of `"$self->{'data'}"`.

- $self-\>STORESIZE($count)

  Modify `"$self->{'data'}"` to represent an array of size *$count*.

- $self-\>**FETCHSIZE()**

  Return the size of the array represented by `"$self->{'data'}"`.

## AUTHOR

Moshe Kamensky \<kamensky@cpan.org\>

## COPYRIGHT AND LICENSE

This software is copyright (c) 2015 by Moshe Kamensky.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.