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| <h3 class="section">7.7 C++-Specific Variable, Function, and Type Attributes</h3> |
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| <p>Some attributes only make sense for C++ programs. |
| |
| <dl> |
| <dt><code>init_priority (</code><var>priority</var><code>)</code><dd><a name="index-init_005fpriority-attribute-3189"></a> |
| |
| <p>In Standard C++, objects defined at namespace scope are guaranteed to be |
| initialized in an order in strict accordance with that of their definitions |
| <em>in a given translation unit</em>. No guarantee is made for initializations |
| across translation units. However, GNU C++ allows users to control the |
| order of initialization of objects defined at namespace scope with the |
| <code>init_priority</code> attribute by specifying a relative <var>priority</var>, |
| a constant integral expression currently bounded between 101 and 65535 |
| inclusive. Lower numbers indicate a higher priority. |
| |
| <p>In the following example, <code>A</code> would normally be created before |
| <code>B</code>, but the <code>init_priority</code> attribute has reversed that order: |
| |
| <pre class="smallexample"> Some_Class A __attribute__ ((init_priority (2000))); |
| Some_Class B __attribute__ ((init_priority (543))); |
| </pre> |
| <p class="noindent">Note that the particular values of <var>priority</var> do not matter; only their |
| relative ordering. |
| |
| <br><dt><code>java_interface</code><dd><a name="index-java_005finterface-attribute-3190"></a> |
| This type attribute informs C++ that the class is a Java interface. It may |
| only be applied to classes declared within an <code>extern "Java"</code> block. |
| Calls to methods declared in this interface will be dispatched using GCJ's |
| interface table mechanism, instead of regular virtual table dispatch. |
| |
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