78 lines
3.6 KiB
HTML
78 lines
3.6 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>M2 Scope - Debugging with GDB</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Debugging with GDB">
|
|
<meta name="generator" content="makeinfo 4.13">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Modula_002d2.html#Modula_002d2" title="Modula-2">
|
|
<link rel="prev" href="M2-Checks.html#M2-Checks" title="M2 Checks">
|
|
<link rel="next" href="GDB_002fM2.html#GDB_002fM2" title="GDB/M2">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
Copyright (C) 1988-2019 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 ``Free Software'' and ``Free Software Needs
|
|
Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
|
|
and with the Back-Cover Texts as in (a) below.
|
|
|
|
(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
|
developing GNU and promoting software freedom.''
|
|
-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family:serif; font-weight:normal; }
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<a name="M2-Scope"></a>
|
|
<p>
|
|
Next: <a rel="next" accesskey="n" href="GDB_002fM2.html#GDB_002fM2">GDB/M2</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="M2-Checks.html#M2-Checks">M2 Checks</a>,
|
|
Up: <a rel="up" accesskey="u" href="Modula_002d2.html#Modula_002d2">Modula-2</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h5 class="subsubsection">15.4.9.8 The Scope Operators <code>::</code> and <code>.</code></h5>
|
|
|
|
<p><a name="index-scope-1051"></a><a name="index-g_t_0040code_007b_002e_007d_002c-Modula_002d2-scope-operator-1052"></a><a name="index-colon_002c-doubled-as-scope-operator-1053"></a><a name="index-g_t_003a_003a_0040r_007b_002c-in-Modula_002d2_007d-1054"></a>
|
|
There are a few subtle differences between the Modula-2 scope operator
|
|
(<code>.</code>) and the <span class="sc">gdb</span> scope operator (<code>::</code>). The two have
|
|
similar syntax:
|
|
|
|
<pre class="smallexample">
|
|
<var>module</var> . <var>id</var>
|
|
<var>scope</var> :: <var>id</var>
|
|
</pre>
|
|
<p class="noindent">where <var>scope</var> is the name of a module or a procedure,
|
|
<var>module</var> the name of a module, and <var>id</var> is any declared
|
|
identifier within your program, except another module.
|
|
|
|
<p>Using the <code>::</code> operator makes <span class="sc">gdb</span> search the scope
|
|
specified by <var>scope</var> for the identifier <var>id</var>. If it is not
|
|
found in the specified scope, then <span class="sc">gdb</span> searches all scopes
|
|
enclosing the one specified by <var>scope</var>.
|
|
|
|
<p>Using the <code>.</code> operator makes <span class="sc">gdb</span> search the current scope for
|
|
the identifier specified by <var>id</var> that was imported from the
|
|
definition module specified by <var>module</var>. With this operator, it is
|
|
an error if the identifier <var>id</var> was not imported from definition
|
|
module <var>module</var>, or if <var>id</var> is not an identifier in
|
|
<var>module</var>.
|
|
|
|
</body></html>
|
|
|