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| <h3 class="section">5.4 Subrange Types</h3> |
| |
| <p>The ‘<samp><span class="samp">r</span></samp>’ type descriptor defines a type as a subrange of another |
| type. It is followed by type information for the type of which it is a |
| subrange, a semicolon, an integral lower bound, a semicolon, an |
| integral upper bound, and a semicolon. The AIX documentation does not |
| specify the trailing semicolon, in an effort to specify array indexes |
| more cleanly, but a subrange which is not an array index has always |
| included a trailing semicolon (see <a href="Arrays.html#Arrays">Arrays</a>). |
| |
| <p>Instead of an integer, either bound can be one of the following: |
| |
| <dl> |
| <dt><code>A </code><var>offset</var><dd>The bound is passed by reference on the stack at offset <var>offset</var> |
| from the argument list. See <a href="Parameters.html#Parameters">Parameters</a>, for more information on such |
| offsets. |
| |
| <br><dt><code>T </code><var>offset</var><dd>The bound is passed by value on the stack at offset <var>offset</var> from |
| the argument list. |
| |
| <br><dt><code>a </code><var>register-number</var><dd>The bound is passed by reference in register number |
| <var>register-number</var>. |
| |
| <br><dt><code>t </code><var>register-number</var><dd>The bound is passed by value in register number <var>register-number</var>. |
| |
| <br><dt><code>J</code><dd>There is no bound. |
| </dl> |
| |
| <p>Subranges are also used for builtin types; see <a href="Traditional-Builtin-Types.html#Traditional-Builtin-Types">Traditional Builtin Types</a>. |
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