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| <title>Debugging with GDB: M2 Scope</title> |
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| <a name="The-Scope-Operators-_003a_003a-and-_002e"></a> |
| <h4 class="subsubsection">15.4.8.8 The Scope Operators <code>::</code> and <code>.</code></h4> |
| <a name="index-scope"></a> |
| <a name="index-_002e_002c-Modula_002d2-scope-operator"></a> |
| <a name="index-colon_002c-doubled-as-scope-operator"></a> |
| <a name="index-_003a_003a_002c-in-Modula_002d2"></a> |
| |
| <p>There are a few subtle differences between the Modula-2 scope operator |
| (<code>.</code>) and the <small>GDB</small> scope operator (<code>::</code>). The two have |
| similar syntax: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> |
| <var>module</var> . <var>id</var> |
| <var>scope</var> :: <var>id</var> |
| </pre></div> |
| |
| <p>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> |
| <p>Using the <code>::</code> operator makes <small>GDB</small> search the scope |
| specified by <var>scope</var> for the identifier <var>id</var>. If it is not |
| found in the specified scope, then <small>GDB</small> searches all scopes |
| enclosing the one specified by <var>scope</var>. |
| </p> |
| <p>Using the <code>.</code> operator makes <small>GDB</small> 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>. |
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