projects / OpenSPARC-T2-SAM / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION0071200000000000000000"></A><A NAME="exprlists"></A> | |
| 56 | <BR> | |
| 57 | 5.12 Expression lists | |
| 58 | </H1> | |
| 59 | <a id='l2h-446' xml:id='l2h-446'></a> | |
| 60 | <P> | |
| 61 | <dl><dd class="grammar"> | |
| 62 | <div class="productions"> | |
| 63 | <table> | |
| 64 | <tr> | |
| 65 | <td><a id='tok-expression_list' xml:id='tok-expression_list'>expression_list</a></td> | |
| 66 | <td>::=</td> | |
| 67 | <td><a class='grammartoken' href="Booleans.html#tok-expression">expression</a> ( "," <a class='grammartoken' href="Booleans.html#tok-expression">expression</a> )* [","]</td></tr> | |
| 68 | </table> | |
| 69 | </div> | |
| 70 | <a class="grammar-footer" | |
| 71 | href="grammar.txt" type="text/plain" | |
| 72 | >Download entire grammar as text.</a> | |
| 73 | </dd></dl> | |
| 74 | ||
| 75 | <P> | |
| 76 | An expression list containing at least one comma yields a | |
| 77 | tuple. The length of the tuple is the number of expressions in the | |
| 78 | list. The expressions are evaluated from left to right. | |
| 79 | <a id='l2h-447' xml:id='l2h-447'></a> | |
| 80 | <P> | |
| 81 | The trailing comma is required only to create a single tuple (a.k.a. a | |
| 82 | <em>singleton</em>); it is optional in all other cases. A single | |
| 83 | expression without a trailing comma doesn't create a | |
| 84 | tuple, but rather yields the value of that expression. | |
| 85 | (To create an empty tuple, use an empty pair of parentheses: | |
| 86 | <code>()</code>.) | |
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| 124 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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