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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/gcc/Static-Definitions.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/gcc/Static-Definitions.html')
| -rw-r--r-- | share/doc/gcc/Static-Definitions.html | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/share/doc/gcc/Static-Definitions.html b/share/doc/gcc/Static-Definitions.html new file mode 100644 index 0000000..0e1f779 --- /dev/null +++ b/share/doc/gcc/Static-Definitions.html @@ -0,0 +1,120 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 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; 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): Static Definitions</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Static Definitions"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Static Definitions"> +<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="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="C_002b_002b-Misunderstandings.html#C_002b_002b-Misunderstandings" rel="up" title="C++ Misunderstandings"> +<link href="Name-lookup.html#Name-lookup" rel="next" title="Name lookup"> +<link href="C_002b_002b-Misunderstandings.html#C_002b_002b-Misunderstandings" rel="previous" title="C++ Misunderstandings"> +<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_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Static-Definitions"></a> +<div class="header"> +<p> +Next: <a href="Name-lookup.html#Name-lookup" accesskey="n" rel="next">Name lookup</a>, Up: <a href="C_002b_002b-Misunderstandings.html#C_002b_002b-Misunderstandings" accesskey="u" rel="up">C++ Misunderstandings</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Declare-and-Define-Static-Members"></a> +<h4 class="subsection">14.7.1 Declare <em>and</em> Define Static Members</h4> + +<a name="index-C_002b_002b-static-data_002c-declaring-and-defining"></a> +<a name="index-static-data-in-C_002b_002b_002c-declaring-and-defining"></a> +<a name="index-declaring-static-data-in-C_002b_002b"></a> +<a name="index-defining-static-data-in-C_002b_002b"></a> +<p>When a class has static data members, it is not enough to <em>declare</em> +the static member; you must also <em>define</em> it. For example: +</p> +<div class="smallexample"> +<pre class="smallexample">class Foo +{ + … + void method(); + static int bar; +}; +</pre></div> + +<p>This declaration only establishes that the class <code>Foo</code> has an +<code>int</code> named <code>Foo::bar</code>, and a member function named +<code>Foo::method</code>. But you still need to define <em>both</em> +<code>method</code> and <code>bar</code> elsewhere. According to the ISO +standard, you must supply an initializer in one (and only one) source +file, such as: +</p> +<div class="smallexample"> +<pre class="smallexample">int Foo::bar = 0; +</pre></div> + +<p>Other C++ compilers may not correctly implement the standard behavior. +As a result, when you switch to <code>g++</code> from one of these compilers, +you may discover that a program that appeared to work correctly in fact +does not conform to the standard: <code>g++</code> reports as undefined +symbols any static data members that lack definitions. +</p> + + + + +</body> +</html> |