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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/cpp/Include-Operation.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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| -rw-r--r-- | share/doc/cpp/Include-Operation.html | 148 |
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diff --git a/share/doc/cpp/Include-Operation.html b/share/doc/cpp/Include-Operation.html new file mode 100644 index 0000000..28a5897 --- /dev/null +++ b/share/doc/cpp/Include-Operation.html @@ -0,0 +1,148 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1987-2023 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. A copy of +the license is included in the +section entitled "GNU Free Documentation License". + +This manual contains no Invariant Sections. The Front-Cover Texts are +(a) (see below), and the Back-Cover Texts are (b) (see below). + +(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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The C Preprocessor: Include Operation</title> + +<meta name="description" content="The C Preprocessor: Include Operation"> +<meta name="keywords" content="The C Preprocessor: Include Operation"> +<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="Index-of-Directives.html#Index-of-Directives" rel="index" title="Index of Directives"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Header-Files.html#Header-Files" rel="up" title="Header Files"> +<link href="Search-Path.html#Search-Path" rel="next" title="Search Path"> +<link href="Include-Syntax.html#Include-Syntax" rel="previous" title="Include Syntax"> +<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="Include-Operation"></a> +<div class="header"> +<p> +Next: <a href="Search-Path.html#Search-Path" accesskey="n" rel="next">Search Path</a>, Previous: <a href="Include-Syntax.html#Include-Syntax" accesskey="p" rel="previous">Include Syntax</a>, Up: <a href="Header-Files.html#Header-Files" accesskey="u" rel="up">Header Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Include-Operation-1"></a> +<h3 class="section">2.2 Include Operation</h3> + +<p>The ‘<samp>#include</samp>’ directive works by directing the C preprocessor to +scan the specified file as input before continuing with the rest of the +current file. The output from the preprocessor contains the output +already generated, followed by the output resulting from the included +file, followed by the output that comes from the text after the +‘<samp>#include</samp>’ directive. For example, if you have a header file +<samp>header.h</samp> as follows, +</p> +<div class="smallexample"> +<pre class="smallexample">char *test (void); +</pre></div> + +<p>and a main program called <samp>program.c</samp> that uses the header file, +like this, +</p> +<div class="smallexample"> +<pre class="smallexample">int x; +#include "header.h" + +int +main (void) +{ + puts (test ()); +} +</pre></div> + +<p>the compiler will see the same token stream as it would if +<samp>program.c</samp> read +</p> +<div class="smallexample"> +<pre class="smallexample">int x; +char *test (void); + +int +main (void) +{ + puts (test ()); +} +</pre></div> + +<p>Included files are not limited to declarations and macro definitions; +those are merely the typical uses. Any fragment of a C program can be +included from another file. The include file could even contain the +beginning of a statement that is concluded in the containing file, or +the end of a statement that was started in the including file. However, +an included file must consist of complete tokens. Comments and string +literals which have not been closed by the end of an included file are +invalid. For error recovery, they are considered to end at the end of +the file. +</p> +<p>To avoid confusion, it is best if header files contain only complete +syntactic units—function declarations or definitions, type +declarations, etc. +</p> +<p>The line following the ‘<samp>#include</samp>’ directive is always treated as a +separate line by the C preprocessor, even if the included file lacks a +final newline. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Search-Path.html#Search-Path" accesskey="n" rel="next">Search Path</a>, Previous: <a href="Include-Syntax.html#Include-Syntax" accesskey="p" rel="previous">Include Syntax</a>, Up: <a href="Header-Files.html#Header-Files" accesskey="u" rel="up">Header Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |