huangmeng
/
Embedded_AI


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106
							<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2017 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 the
Invariant Sections being "Funding Free Software", the Front-Cover
Texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below).  A copy of the license is included in the section entitled
"GNU Free Documentation License".

(a) The FSF's Front-Cover Text is:

A GNU Manual

(b) The FSF's Back-Cover Text is:

You have freedom to copy and modify this GNU Manual, like GNU
     software.  Copies published by the Free Software Foundation raise
     funds for GNU development. -->
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
<head>
<title>Using the GNU Compiler Collection (GCC): GNU Objective-C runtime API</title>

<meta name="description" content="Using the GNU Compiler Collection (GCC): GNU Objective-C runtime API">
<meta name="keywords" content="Using the GNU Compiler Collection (GCC): GNU Objective-C runtime API">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Objective_002dC.html#Objective_002dC" rel="up" title="Objective-C">
<link href="Modern-GNU-Objective_002dC-runtime-API.html#Modern-GNU-Objective_002dC-runtime-API" rel="next" title="Modern GNU Objective-C runtime API">
<link href="Objective_002dC.html#Objective_002dC" rel="prev" title="Objective-C">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
div.smalllisp {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}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="GNU-Objective_002dC-runtime-API"></a>
<div class="header">
<p>
Next: <a href="Executing-code-before-main.html#Executing-code-before-main" accesskey="n" rel="next">Executing code before main</a>, Up: <a href="Objective_002dC.html#Objective_002dC" accesskey="u" rel="up">Objective-C</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="GNU-Objective_002dC-Runtime-API"></a>
<h3 class="section">8.1 GNU Objective-C Runtime API</h3>

<p>This section is specific for the GNU Objective-C runtime.  If you are
using a different runtime, you can skip it.
</p>
<p>The GNU Objective-C runtime provides an API that allows you to
interact with the Objective-C runtime system, querying the live
runtime structures and even manipulating them.  This allows you for
example to inspect and navigate classes, methods and protocols; to
define new classes or new methods, and even to modify existing classes
or protocols.
</p>
<p>If you are using a &ldquo;Foundation&rdquo; library such as GNUstep-Base, this
library will provide you with a rich set of functionality to do most
of the inspection tasks, and you probably will only need direct access
to the GNU Objective-C runtime API to define new classes or methods.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Modern-GNU-Objective_002dC-runtime-API.html#Modern-GNU-Objective_002dC-runtime-API" accesskey="1">Modern GNU Objective-C runtime API</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Traditional-GNU-Objective_002dC-runtime-API.html#Traditional-GNU-Objective_002dC-runtime-API" accesskey="2">Traditional GNU Objective-C runtime API</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>


</body>
</html>