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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for GNU Texinfo (version 6.8, 8 June 2021), a documentation system that can produce both online information and a printed manual from a single source using semantic markup. Copyright (C) 1988, 1990-1993, 1995-1999, 2001-2021 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". --> <title>Object-Oriented Variables (GNU Texinfo 6.8)</title> <meta name="description" content="Object-Oriented Variables (GNU Texinfo 6.8)"> <meta name="keywords" content="Object-Oriented Variables (GNU Texinfo 6.8)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2any"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Command-and-Variable-Index.html" rel="index" title="Command and Variable Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Abstract-Objects.html" rel="up" title="Abstract Objects"> <link href="Object_002dOriented-Methods.html" rel="next" title="Object-Oriented Methods"> <style type="text/css"> <!-- a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em} a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} span:hover a.copiable-anchor {visibility: visible} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <div class="subsubsection" id="Object_002dOriented-Variables"> <div class="header"> <p> Next: <a href="Object_002dOriented-Methods.html" accesskey="n" rel="next">Object-Oriented Methods</a>, Up: <a href="Abstract-Objects.html" accesskey="u" rel="up">Object-Oriented Programming</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p> </div> <hr> <span id="Object_002dOriented-Variables-1"></span><h4 class="subsubsection">13.5.6.1 Object-Oriented Variables</h4> <span id="index-Variables_002c-object_002doriented"></span> <p>These commands allow you to define different sorts of variables in object-oriented programming languages. </p> <dl compact="compact"> <dt id='index-defcv'><span><code>@defcv <var>category</var> <var>class</var> <var>name</var></code><a href='#index-defcv' class='copiable-anchor'> ¶</a></span></dt> <dd><p>The <code>@defcv</code> command is the general definition command for variables associated with classes in object-oriented programming. The <code>@defcv</code> command is followed by three arguments: the category of thing being defined, the class to which it belongs, and its name. For instance: </p> <div class="example"> <pre class="example">@defcv {Class Option} Window border-pattern … @end defcv </pre></div> <p>produces: </p><dl class="def"> <dt id="index-border_002dpattern"><span>Class Option of Window: <strong>border-pattern</strong><a href='#index-border_002dpattern' class='copiable-anchor'> ¶</a></span></dt> <dd><p>… </p></dd></dl> <p><code>@defcv</code> creates an entry in the index of variables. </p> </dd> <dt id='index-deftypecv'><span><code>@deftypecv <var>category</var> <var>class</var> <var>data-type</var> <var>name</var></code><a href='#index-deftypecv' class='copiable-anchor'> ¶</a></span></dt> <dd><p>The <code>@deftypecv</code> command is the definition command for typed class variables in object-oriented programming. It is analogous to <code>@defcv</code> with the addition of the <var>data-type</var> parameter to specify the type of the instance variable. Ordinarily, the data type is a programming language construct that should be marked with <code>@code</code>. For instance: </p> <div class="example"> <pre class="example">@deftypecv {Class Option} Window @code{int} border-pattern … @end deftypecv </pre></div> <p>produces: </p> <dl class="def"> <dt id="index-border_002dpattern-of-Window"><span>Class Option of Window: <em><code>int</code></em> <strong>border-pattern</strong><a href='#index-border_002dpattern-of-Window' class='copiable-anchor'> ¶</a></span></dt> <dd><p>… </p></dd></dl> <p><code>@deftypecv</code> creates an entry in the index of variables. </p> </dd> <dt id='index-defivar'><span><code>@defivar <var>class</var> <var>name</var></code><a href='#index-defivar' class='copiable-anchor'> ¶</a></span></dt> <dd><p>The <code>@defivar</code> command is the definition command for instance variables in object-oriented programming. <code>@defivar</code> is equivalent to ‘<samp>@defcv {Instance Variable} …</samp>’. For instance: </p> <div class="example"> <pre class="example">@defivar Window border-pattern … @end defivar </pre></div> <p>produces: </p> <dl class="def"> <dt id="index-border_002dpattern-of-Window-1"><span>Instance Variable of Window: <strong>border-pattern</strong><a href='#index-border_002dpattern-of-Window-1' class='copiable-anchor'> ¶</a></span></dt> <dd><p>… </p></dd></dl> <p><code>@defivar</code> creates an entry in the index of variables. </p> </dd> <dt id='index-deftypeivar'><span><code>@deftypeivar <var>class</var> <var>data-type</var> <var>name</var></code><a href='#index-deftypeivar' class='copiable-anchor'> ¶</a></span></dt> <dd><p>The <code>@deftypeivar</code> command is the definition command for typed instance variables in object-oriented programming. It is analogous to <code>@defivar</code> with the addition of the <var>data-type</var> parameter to specify the type of the instance variable. Ordinarily, the data type is a programming language construct that should be marked with <code>@code</code>. For instance: </p> <div class="example"> <pre class="example">@deftypeivar Window @code{int} border-pattern … @end deftypeivar </pre></div> <p>produces: </p> <dl class="def"> <dt id="index-border_002dpattern-of-Window-2"><span>Instance Variable of Window: <em><code>int</code></em> <strong>border-pattern</strong><a href='#index-border_002dpattern-of-Window-2' class='copiable-anchor'> ¶</a></span></dt> <dd><p>… </p></dd></dl> <p><code>@deftypeivar</code> creates an entry in the index of variables. </p> </dd> </dl> </div> <hr> <div class="header"> <p> Next: <a href="Object_002dOriented-Methods.html">Object-Oriented Methods</a>, Up: <a href="Abstract-Objects.html">Object-Oriented Programming</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p> </div> </body> </html>