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| <h5 class="subsubsection">15.4.6.8 The Scope Operators <code>::</code> and <code>.</code></h5> |
| |
| <p><a name="index-scope-853"></a><a name="index-g_t_0040code_007b_002e_007d_002c-Modula_002d2-scope-operator-854"></a><a name="index-colon_002c-doubled-as-scope-operator-855"></a><a name="index-g_t_003a_003a_0040r_007b_002c-in-Modula_002d2_007d-856"></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>. |
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