78 lines
3.6 KiB
HTML
78 lines
3.6 KiB
HTML
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<html lang="en">
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<head>
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<title>M2 Scope - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Modula_002d2.html#Modula_002d2" title="Modula-2">
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<link rel="prev" href="M2-Checks.html#M2-Checks" title="M2 Checks">
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<link rel="next" href="GDB_002fM2.html#GDB_002fM2" title="GDB/M2">
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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</head>
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<body>
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<div class="node">
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<a name="M2-Scope"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="GDB_002fM2.html#GDB_002fM2">GDB/M2</a>,
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Previous: <a rel="previous" accesskey="p" href="M2-Checks.html#M2-Checks">M2 Checks</a>,
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Up: <a rel="up" accesskey="u" href="Modula_002d2.html#Modula_002d2">Modula-2</a>
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<hr>
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</div>
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<h5 class="subsubsection">15.4.9.8 The Scope Operators <code>::</code> and <code>.</code></h5>
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<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>
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There are a few subtle differences between the Modula-2 scope operator
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(<code>.</code>) and the <span class="sc">gdb</span> scope operator (<code>::</code>). The two have
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similar syntax:
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<pre class="smallexample">
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<var>module</var> . <var>id</var>
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<var>scope</var> :: <var>id</var>
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</pre>
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<p class="noindent">where <var>scope</var> is the name of a module or a procedure,
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<var>module</var> the name of a module, and <var>id</var> is any declared
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identifier within your program, except another module.
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<p>Using the <code>::</code> operator makes <span class="sc">gdb</span> search the scope
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specified by <var>scope</var> for the identifier <var>id</var>. If it is not
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found in the specified scope, then <span class="sc">gdb</span> searches all scopes
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enclosing the one specified by <var>scope</var>.
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<p>Using the <code>.</code> operator makes <span class="sc">gdb</span> search the current scope for
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the identifier specified by <var>id</var> that was imported from the
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definition module specified by <var>module</var>. With this operator, it is
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an error if the identifier <var>id</var> was not imported from definition
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module <var>module</var>, or if <var>id</var> is not an identifier in
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<var>module</var>.
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</body></html>
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