Indexer (programming): Difference between revisions

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{{Short description|Object-oriented programming concept}}

In [[object-oriented programming]], an '''indexer''' allows instances of a particular class or struct to be indexed just like arrays.<ref>{{cite web|access-date=2011-08-01 |author=jagadish980 |date=2008-01-29 |website=SURESHKUMAR.NET FORUMS |title=C# - What is an indexer in C# |url=http://forums.sureshkumar.net/vb-asp-net-interview-technical-questions/16320-c-what-indexer-c.html |archive-url=https://web.archive.org/web/20090922193214/http://forums.sureshkumar.net/vb-asp-net-interview-technical-questions/16320-c-what-indexer-c.html |archive-date=September 22, 2009 }}</ref> It is a form of [[operator overloading]].

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In [[PHP]] indexing can be implemented via the predefined {{code|ArrayAccess}} interface,<ref>{{cite web|url=https://www.php.net/manual/en/class.arrayaccess.php|title=PHP ArrayAccess interface}}</ref>

<syntaxhighlight lang="php">

<?php

class Vector implements ArrayAccess

{

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for ($i = 0; $i < $vector->size; $i++) $vector[$i] = $i + 1;

for ($i = 0; $i < $vector->size; $i++) print "{$vector[$i]}\n";

?>

</syntaxhighlight>

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== See also ==

{{Portal|Computer programming}}

* [[Mutator method]]